Proteomics-based identification of cancer-associated proteins in chronic lymphocytic leukaemia

BACKGROUND: Chronic lymphocytic leukaemia (CLL) is a neoplasm of B-cells characterized by variable prognosis. Exploring the proteome of CLL cells may provide insights into the disease. Therefore, eleven proteomics experiments were conducted on eleven primary CLL samples. RESULTS: We reported a CLL proteome consisting of 919 proteins (false discovery rate (FDR) 1%) whose identification was based on the sequencing of two or more distinct peptides (FDR of peptide sequencing 1%). Mass spectrometry-based protein identification was validated for four different proteins using Western blotting and specific antibodies in different CLL samples. Small sizes of nucleolin (~57 kDa and ~68 kDa) showed a potential association with good prognosis CLL cells (n = 8, p < 0.01). Compared with normal B-cells, CLL cells over-expressed thyroid hormone receptor-associated protein 3 (THRAP3; n = 9; p = 0.00007), which is implicated in cell proliferation; and heterochromatin protein 1-binding protein 3 (HP1BP3; n = 10; p = 0.0002), which promotes cell survival and tumourogenesis. A smaller form of HP1BP3, which may correspond to HP1BP3 isoform-2, was specifically identified in normal B-cells (n = 10; p = 0.0001). HP1BP3 and THRAP3 predicted poor prognosis of CLL (p 0.05). Consistently, THRAP3 and HP1BP3 were found to be associated with cancer-related pathways (p 0.05). CONCLUSIONS: Our findings add to the known proteome of CLL and confirm the prognostic importance of two novel cancer-associated proteins in this disease.

El factor de transcripción bZIP Afap1 afecta al estrés oxidativo y la biosíntesis de aflatoxinas en Aspergillus flavus / The bZIP transcription factor Afap1 mediates the oxidative stress response and aflatoxin biosynthesis in Aspergillus flavus

Abstract Aflatoxin is a carcinogenic secondary metabolite produced mainly by Aspergillus flavus and Aspergillus parasiticus, which can seriously endanger the health of humans and animals. Oxidative stress is a common defense response, and it is known that reactive oxygen species (ROS) can induce the synthesis of a series of secondary metabolites, including aflatoxin. By using mutants lacking the afap 1 gene, the role of afap 1 gene in oxidative stress and aflatoxin synthesis was assessed. The growth of the mutant strains was significantly inhibited by the increase in the concentration of H2O2, inhibition was complete at 40mmol/l. However, in the quantitative analysis by HPLC, the concentration of AFB1 increased with the increased H 2O 2 until 10mmol/l. Following an analysis based on the information provided by the NCBI BLAST analysis, it was assumed that Afap1, a basic leucine zipper (bZIP) transcription factor, was associated with the oxidative stress in this fungus. Treatment with 5mmol/l H 2O 2 completely inhibited the growth of the mutant strains in afap 1 but did not affect the growth of the CA14PTs strain (non-mutant strain). In addition, the concentration of AFB 1 in the mutant strains was approximately V of that observed in the CA14PTs strain. These results suggested that Afap1 plays a key role in the regulation of oxidative stress and aflatoxin production in A. flavus. ©2018 Published by Elsevier España, S.L.U. on behalf of Asociación Argentina de Microbiología. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/ licenses/by-nc-nd/4.0/).

Resumen La aflatoxina es un metabolito secundario cancerígeno producido principalmente por Aspergillus flavus y Aspergillus parasiticus, que pone en riesgo grave a la salud de los humanos y los animales. El estrés oxidativo es una respuesta de defensa común, y es sabido que las especies reactivas de oxígeno (ROS) pueden inducir la síntesis de una serie de metabolitos secundarios, incluida la aflatoxina. Empleando mutantes carentes del gen afap1 se evaluó el papel de Afap1 en el estrés oxidativo y la síntesis de aflatoxinas. El crecimiento de las cepas mutadas se vio significativamente inhibido con el aumento de la concentración de H 2O 2, la inhibición fue completa a 40mmol/l. Sin embargo, en el análisis cuantitativo por HPLC, la concentración de la aflatoxina AFBi aumentó con el aumento de la concentración de H 2O 2 hasta 10mmol/l. Tras un análisis apoyado en la información provista por la herramienta NCBI BLAST, se supuso que Afap1, un factor de transcripción de la cremallera de leucina básica (bZIP), estaba asociado con el estrés oxidativo en este hongo. El tratamiento con 5mmol/l de H 2O 2 inhibió completamente el crecimiento de las cepas mutantes en afap1, pero no afectó el crecimiento de la cepa CA14PTs (cepa no mutada). Además, la concentración de AFB 1 en las cepas mutadas fue de aproximadamente 1/4 de la observada en CA14PTs. Estos resultados sugieren que Afap1 juega un papel clave en la regulación del estrés oxidativo y la producción de aflatoxinas en A. flavus.

Alveolar bone healing in rats: micro-CT, immunohistochemical and molecular analysis

Abstract Alveolar bone healing after upper incisor extraction in rats is a classical model of preclinical studies. The underlying morphometric, cellular and molecular mechanism, however, remains imprecise in a unique study. Objectives The aim of this study was therefore to characterize the alveolar bone healing after upper incisor extraction in rats by micro computed tomographic (Micro-CT), immunohistochemical and real-time polymerase chain reaction (RT-PCR) analysis. Material and Methods Thirty animals (Rattus norvegicus, Albinus Wistar) were divided into three groups after upper incisors extraction at 7, 14, and 28 days. Micro-CT was evaluated based on the morphometric parameters. Subsequently, the histological analyses and immunostaining of osteoprotegerin (OPG), receptor activator of nuclear kappa B ligand (RANKL) and tartrate resistant acid phosphate (TRAP) was performed. In addition, RT-PCR analyses of OPG, RANKL, the runt-related transcription factor 2 (RUNX2), osteocalcin (OC), osteopontin (OPN), osterix (OST) and receptor activator of nuclear kappa B (RANK) were performed to determine the expression of these proteins in the alveolar bone healing. Results Micro-CT: The morphometric parameters of bone volume and trabecular thickness progressively increased over time. Consequently, a gradual decrease in trabecular separation, trabecular space and total bone porosity was observed. Immunohistochemical: There were no differences statistically significant between the positive labeling for OPG, RANKL and TRAP in the different periods. RT-PCR: At 28 days, there was a significant increase in OPG expression, while RANKL expression and the RANKL/OPG ratio both decreased over time. Conclusion Micro-CT showed the newly formed bone had favorable morphometric characteristics of quality and quantity. Beyond the RUNX2, OC, OPN, OST, and RANK proteins expressed in the alveolar bone healing, OPG and RANKL activity showed to be essential for activation of basic multicellular units during the alveolar bone healing.

The role of Osterix protein in the pathogenesis of peripheral ossifying fibroma

Abstract Peripheral ossifying fibroma (POF) is a reactive lesion of oral tissues, associated with local factors such as trauma or presence of dental biofilm. POF treatment consists of curettage of the lesion combined with root scaling of adjacent teeth and/or removal of other sources of irritants. This study aimed to analyze the clinical and pathological features of POF and to investigate the immunoexpression of Osterix and STRO-1 proteins. Data such as age, gender, and size were obtained from 30 cases of POF. Microscopic features were assessed by conventional light microscopy using hematoxylin-eosin staining and immunohistochemical markers, and by polarized light microscopy using Picrosirius red staining. The age range was 11-70 years and 70% of the patients were female. Moreover, the size of POF varied from 0.2 to 5.0 cm; in 43.33% of the cases, the mineralized content consisted exclusively of bony trabeculae. The immunohistochemical analysis showed nuclear staining for Osterix in 63% and for STRO-1 in 20% of the cases. Mature collagen fibers were observed in mineralized tissue in 76.67% of the cases. The clinical and microscopic features observed were in agreement with those described in the literature. Osterix was overexpressed, while STRO-1 was poorly expressed. Osterix was expressed particularly in cells entrapped in and around mineralized tissue, indicating the presence of a stimulus that triggers the differentiation of these cells into osteoblasts or cementoblasts, i.e., cells that produce mineralized tissue. Based on our results, Osterix may play a role in the pathogenesis of POF.

Characterization of reactive stroma in prostate cancer: involvement of growth factors, metalloproteinase matrix, sexual hormones receptors and prostatic stem cells

ABSTRACT Introduction and Objectives: Reactive Stroma (RStr) is observed in many human cancers and is related to carcinogenesis. The objectives of the present study were to stablish a relationship of the RStr microenvironment with prostate cancer (Pca) through a morphological and molecular characterization, and to identify a possible relationship between RStr with worse prognosis factors and occurrence of malignant prostatic stem cells. Materials and Methods: Forty prostatic samples were selected from men with Pca diagnosis submitted to radical prostatectomy; they were divided in two groups: Group-1 (n=20): samples without reactive stroma; Group-2 (n=20): samples of PCa with intense stroma reaction. Prostatic samples were evaluated for RStr intensity by Masson Trichromic stain and posteriorly submitted to histopathological and immunohistochemistry analysis for antigens: α-actin, vimentin, IGF-1, MMP-2, FGF-2, C-Myc, PSCA, AR, Erα and ERβ. Results: Reactive stroma with intense desmoplastic reactivity was significantly more frequent in intermediate (Gleason 7, 3+4) and high grade tumors (Gleason 7, 4+3). The group with intense stromal reactivity showed significant higher levels of Vimentin, IGF-1, MMP-2, FGF-2, C-Myc, PSCA and ERα. Conclusions: It can be concluded that RStr may be a predictive marker of Pca progression, since it was associated with increase of growth factors, imbalance of androgen and estrogen receptors and presence of malign prostatic stem cells.

Concurrent Down-Regulation of PTEN and NKX3.1 Expression in Iranian Patients with Prostate Cancer

ABSTRACT NKX3.1 and PTEN genes are involved in the development and progression of prostate cancer (PCa). Here, in line with other studies that correlated the expression of these two genes, we aimed at evaluating the expression pattern of these genes in clinical PCa samples. Collectively, 81 tissue samples including 45 human PCa and 36 benign prostatic hyperplasia (BPH) specimens were included in the study. The tissue samples were subjected to RNA extraction and subsequently to cDNA synthesis according to the kit manufacturer's protocol. Quantitative Real-Time PCR assay was performed for each sample in triplicate reactions. REST and SPSS software were used to statistically analyze PTEN and NKX3.1 gene expression data. Expression level of both NKX3.1 and PTEN genes was down-regulated in PCa samples compared to BPH samples. The relative expression ratio of PTEN and NKX3.1 was decreased to 0.155 and 0.003, respectively (P=0.000). The results of Chi-Square analysis revealed a significant correlation between the expression of these genes in both BPH and cancer groups (P=0.004 and 0.001, respectively). According to previous studies and our data, we concluded that the association between the down-regulation of PTEN and NKX3.1 genes contributed to the prostate tumorigenesis. This might highlight the interaction between the proteins encoded by these genes. Furthermore, this finding might be exploited for the development of innovative diagnostic and therapeutic approaches in PCa.

Beneficial effects montelukast, cysteinyl-leukotriene receptor antagonist, on renal damage after unilateral ureteral obstruction in rats

Introductıon Ureteral obstruction is a common pathology and caused kidney fibrosis and dysfunction at late period. In this present, we investigated the antifibrotic and antiinflammatory effects of montelukast which is cysteinyl leukotriene receptor antagonist, on kidney damage after unilateral ureteral obstruction(UUO) in rats. Mateirıals and Methods 32 rats divided four groups. Group 1 was control, group 2 was sham, group 3 was rats with UUO and group 4 was rats with UUO which were given montelukast sodium (oral 10 mg/kg/day). After 14 days, rats were killed and their kidneys were taken and blood analysis was performed. Tubular necrosis, mononuclear cell infiltration and interstitial fibrosis scoring were determined histopathologically in a part of kidneys; nitric oxide(NO), malondialdehyde(MDA) and reduced glutathione(GSH) levels were determined in the other part of kidneys. Urea-creatinine levels were investigated at blood analysis. Statistical analyses were made by the Chi-square test and one-way analysis of variance (ANOVA). Results There was no difference significantly for urea-creatinine levels between groups. Pathologically, there was serious tubular necrosis and fibrosis in group 3 and there was significantly decreasing for tubular necrosis and fibrosis in group 4(p<0.005). Also, there was significantly increasing for NO and MDA levels; decreasing for GSH levels in group 3 compared the other groups(p<0.005). Conclusıon We can say that montelukast prevent kidney damage with antioxidant effect, independently of NO. .

Modulação da diferenciação neural de células troco embrionárias por transientes de cálcio intracelulares: papéis dos receptores purinérgicos e de canais de cálcio voltagem-dependentes / Modulation of neural embryonic stem cell differentiation by intracellular Ca2+ oscillations. Roles of purinergic receptors and voltage gated Ca2+ channels

Receptores purinérgicos e canais de cálcio voltagem-dependentes estão envolvidos em diversos processos biológicos como na gastrulação, durante o desenvolvimento embrionário, e na diferenciação neural. Quando ativados, canais de cálcio voltagem-dependentes e receptores purinérgicos do tipo P2, ativados por nucleotídeos, desencadeiam transientes de cálcio intracelulares controlando diversos processos biológicos. Neste trabalho, nós estudamos a participação de canais de cálcio voltagem-dependentes e receptores do tipo P2 na geração de transientes de cálcio espontâneos e sua regulação na expressão de fatores de transcrição relacionados com a neurogênese utilizando como modelo células tronco (CTE) induzidas à diferenciação em células tronco neurais (NSC) com ácido retinóico. Descrevemos que CTE indiferenciadas podem ter a proliferação acelerada pela ativação de receptores P2X7, enquanto que a expressão e a atividade desse receptor precisam ser inibidas para o progresso da diferenciação em neuroblasto. Além disso, ao longo da diferenciação neural, por análise em tempo real dos níveis de cálcio intracelular livre identificamos 3 padrões de oscilações espontâneas de cálcio (onda, pico e unique), e mostramos que ondas e picos tiveram a frequência e amplitude aumentadas conforme o andamento da diferenciação. Células tratadas com o inibidor do receptor de inositol 1,4,5-trifosfato (IP3R), Xestospongin C, apresentaram picos mas não ondas, indicando que ondas dependem exclusivamente de cálcio oriundo do retículo endoplasmático pela ativação de IP3R. NSC de telencéfalo de embrião de camundongos transgênicos ou pré-diferenciadas de CTE tratadas com Bz-ATP, o agonista do receptor P2X7, e com 2SUTP, agonista de P2Y2 e P2Y4, aumentaram a frequência e a amplitude das oscilações espontâneas de cálcio do tipo pico. Dados, obtidos por microscopia de luminescência, da expressão em tempo real de gene repórter luciferase fusionado à Mash1 e Ngn2 revelou que a ativação dos receptores P2Y2/P2Y4 aumentou a expressão estável de Mash1 enquanto que ativação do receptor P2X7 levou ao aumento de Ngn2. Além disso, células na presença do quelante de cálcio extracelular (EGTA) ou do depletor dos estoques intracelulares de cálcio do retículo endoplasmático (thapsigargin) apresentaram redução na expressão de Mash1 e Ngn2, indicando que ambos são regulados pela sinalização de cálcio. A investigação dos canais de cálcio voltagem-dependentes demonstrou que o influxo de cálcio gerado por despolarização da membrana de NSC diferenciadas de CTE é decorrente da ativação de canais de cálcio voltagem-dependentes do tipo L. Além disso, esse influxo pode controlar o destino celular por estabilizar expressão de Mash1 e induzir a diferenciação neuronal por fosforilação e translocação do fator de transcrição CREB. Esses dados sugerem que os receptores P2X7, P2Y2, P2Y4 e canais de cálcio voltagem-dependentes do tipo L podem modular as oscilações espontâneas de cálcio durante a diferenciação neural e consequentemente alteram o padrão de expressão de Mash1 e Ngn2 favorecendo a decisão do destino celular neuronal

Purinergic receptors and voltage gated Ca2+ channels have been attributed with developmental functions including gastrulation and neural differentiation. Upon activation, nucleotide-activated P2 purinergic receptor and voltage-gated Ca2+ channel subtypes trigger intracellular calcium transients controlling cellular processes. Here, we studied the participation of voltage-gated calcium channels and P2 receptor activity in spontaneous calcium transients and consequent regulation expression of transcription factors related to retinoic acid-induced neurogenesis of mouse neural stem and embryonic stem cells (ESC). In embryonic pluripotent stem cells, proliferation is accelerated by P2X7 receptor activation, while receptor expression / activity needs to be down-regulated for the progress of neuroblast differentiation. Moreover, along neural differentiation time lapse imaging with means of a cytosolic calcium-sensitive fluorescent probe provided different patterns of spontaneous calcium transients (waves and spikes) showing that both, frequency and amplitude increased along differentiation. Cells treated with the inositol 1,4,5-trisphosphate receptor (IP3R) inhibitor Xestospongin C showed spikes but not waves, indicating that waves exclusively depended on calcium release from endoplasmic reticulum by IP3R activation. Cells treated with the P2X7 receptor subtype agonist Bz-ATP and the P2Y2 and P2Y4 receptor 2-S-UTP increased frequency and amplitudes of calcium transients, mainly spikes, in embryonic telencephalon neural stem cells (NSC) and NSC pre-differentiated from ESC. Data obtained by luminescence time lapse imaging of stable transfected cells with Mash1 or Ngn2 promoter-protein fusion to luciferase reporter construct revealed increased Mash1 expression due to activation of P2Y2/P2Y4 receptor subtypes, while increased expression of Ngn2 was observed following P2X7 receptor activation. In addition, cells imaged in presence of the extracellular calcium chelator EGTA or following endoplasmic reticulum calcium store depletion by thapsigargin showed a decrease in Mash1 and Ngn2 expression, indicating that both are regulated by calcium signaling. Investigation of the roles of voltage gated Ca2+ channels in neural differentiation showed that Ca2+ influx in NSC pre-differentiated from ESC is due to membrane depolarization and L-type voltage gated Ca2+ channel activation, thereby controlling cell fate decision, by stabilizing the expression of MASH1 and inducing differentiation, by phosphorylation of the transcription factor CREB. Altogether these data suggest that P2X7, P2Y2, P2Y4 receptors and L-type voltage gated Ca2+ channels can modulate spontaneous calcium oscillations during neural differentiation and consequently change the Mash1 and Ngn2 expression patterns, thus favoring the cell fate decision to the neuronal phenotype

Bioinformatics analysis of biomarkers and transcriptional factor motifs in Down syndrome

In this study, biomarkers and transcriptional factor motifs were identified in order to investigate the etiology and phenotypic severity of Down syndrome. GSE 1281, GSE 1611, and GSE 5390 were downloaded from the gene expression ominibus (GEO). A robust multiarray analysis (RMA) algorithm was applied to detect differentially expressed genes (DEGs). In order to screen for biological pathways and to interrogate the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway database, the database for annotation, visualization, and integrated discovery (DAVID) was used to carry out a gene ontology (GO) function enrichment for DEGs. Finally, a transcriptional regulatory network was constructed, and a hypergeometric distribution test was applied to select for significantly enriched transcriptional factor motifs. CBR1, DYRK1A, HMGN1, ITSN1, RCAN1, SON, TMEM50B, and TTC3 were each up-regulated two-fold in Down syndrome samples compared to normal samples; of these, SON and TTC3 were newly reported. CBR1, DYRK1A, HMGN1, ITSN1, RCAN1, SON, TMEM50B, and TTC3 were located on human chromosome 21 (mouse chromosome 16). The DEGs were significantly enriched in macromolecular complex subunit organization and focal adhesion pathways. Eleven significantly enriched transcription factor motifs (PAX5, EGR1, XBP1, SREBP1, OLF1, MZF1, NFY, NFKAPPAB, MYCMAX, NFE2, and RP58) were identified. The DEGs and transcription factor motifs identified in our study provide biomarkers for the understanding of Down syndrome pathogenesis and progression.

Five-alpha Reductase Inhibitor Influences Expression of Androgen Receptor and HOXB13 in Human Hyperplastic Prostate Tissue

Objectives Five-alpha reductase inhibitors (5ARIs) are known as chemopreventive agents in prostate cancer with a risk of high-grade disease. This study evaluated the effects of 5ARI on androgen receptor (AR) and proteins involved in prostate cell growth such as HOXB13 expression in human prostate tissue and LNCaP prostate cancer cells. Materials and Methods We retrospectively selected 21 patients who underwent TURP between March 2007 and February 2010 for previously confirmed BPH by prostate biopsy. They were grouped into control (group 1, n = 9) and 5ARI treatment (group 2, n = 12) before TURP. AR and HOXB13 expression in prostate tissue was evaluated by immunohistochemical staining. We tested the effect of 5ARI on the expression of AR, prostate specific antigen (PSA) and HOXB13 in LNCaP cells. Cells were assessed by Western blot analysis, MTT in vitro proliferation assay, and ELISA. Results: Group 2 showed stronger reactivity for AR and HOXB13 than those of the group 1. MTT assay showed death of LNCaP cells at 25uM of 5ARI. At the same time, ELISA assay for PSA showed that 5ARI inhibited secretion of PSA in LNCaP cells. Western blot analysis showed that 5ARI did not greatly alter AR expression but it stimulated the expression of HOXB13. Conclusions These results demonstrated that 5ARI influences AR and HOXB13 expression in both LNCaP cells and human prostate tissue. In order to use 5ARI in chemoprevention of prostate cancer, we still need to clarify the influence of 5ARI in ARs and oncogenic proteins and its regulation pathway. .

Analysis of crucial molecules involved in herniated discs and degenerative disc disease

OBJECTIVES: Herniated discs and degenerative disc disease are major health problems worldwide. However, their pathogenesis remains obscure. This study aimed to explore the molecular mechanisms of these ailments and to identify underlying therapeutic targets. MATERIAL AND METHODS: Using the GSE23130 microarray datasets downloaded from the Gene Expression Omnibus database, differentially co-expressed genes and links were identified using the differentially co-expressed gene and link method with a false discovery rate ,0.25 as a significant threshold. Subsequently, the underlying molecular mechanisms of the differential co-expression of these genes were investigated using Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis. In addition, the transcriptional regulatory relationship was also investigated. RESULTS: Through the analysis of the gene expression profiles of different specimens from patients with these diseases, 539 differentially co-expressed genes were identified for these ailments. The ten most significant signaling pathways involving the differentially co-expressed genes were identified by enrichment analysis. Among these pathways, apoptosis and extracellular matrix-receptor interaction pathways have been reported to be related to these diseases. A total of 62 pairs of regulatory relationships between transcription factors and their target genes were identified as critical for the pathogenesis of these diseases. CONCLUSION: The results of our study will help to identify the mechanisms responsible for herniated discs and degenerative disc disease and provides a theoretical basis for further therapeutic study.

In vitro evaluation of the odontogenic potential of mouse undifferentiated pulp cells

The aim of this study was to evaluate the odontogenic potential of undifferentiated pulp cells (OD-21 cell line) through chemical stimuli in vitro. Cells were divided into uninduced cells (OD-21), induced cells (OD-21 cultured in supplemented medium/OD-21+OM) and odontoblast-like cells (MDPC-23 cell line). After 3, 7, 10 and 14 days of culture, it was evaluated: proliferation and cell viability, alkaline phosphatase activity, total protein content, mineralization, immunolocalization of dentin matrix acidic phosphoprotein 1 (DMP1), alkaline phosphatase (ALP) and osteopontin (OPN) and quantification of genes ALP, OSTERIX (Osx), DMP1 and runt-related transcription factor 2 (RUNX2) through real-time polymerase chain reaction (PCR). Data were analyzed by Kruskal-Wallis and Mann-Whitney U tests (p<0.05). There was a decrease in cell proliferation in OD-21 + OM, whereas cell viability was similar in all groups, except at 7 days. The amount of total protein was higher in group OD-21 + OM in all periods; the same occurred with ALP activity after 10 days when compared with OD-21, with no significant differences from the MDPC-23 group. Mineralization was higher in OD-21+OM when compared with the negative control. Immunolocalization demonstrated that DMP1 and ALP were highly expressed in MDPC-23 cells and OD-21 + OM cells, whereas OPN was high in all groups. Real-time PCR revealed that DMP1 and ALP expression was higher in MDPC-23 cell cultures, whereas RUNX2 was lower for these cells and higher for OD-21 negative control. Osx expression was lower for OD-21 + OM. These results suggest that OD-21 undifferentiated pulp cells have odontogenic potential and could be used in dental tissue engineering.

O objetivo foi avaliar o potencial odontogênico de células indiferenciadas da polpa (OD-21) por meio de indução química in vitro. As células foram divididas em grupos: controle (OD-21), induzido (OD-21 em meio suplementado/OD-21 + OM), e células odontoblastóides (MDPC-23). Após 3, 7, 10 e 14 dias, avaliou-se proliferação e viabilidade celular, proteína total e fosfatase alcalina (ALP), mineralização, imunolocalização da proteína da matriz dentinária 1 (DMP1), ALP e osteopontina (OPN), assim como a expressão dos genes ALP, OSTERIX (Osx), DMP1 e fator de transcrição RUNX2 por PCR em tempo real. Os dados foram avaliados pelo teste de Kruskal-Wallis seguido pelo teste de Mann-Whitney U (p<0.05). Houve diminuição na proliferação celular em OD-21 + OM, com viabilidade celular similar em todos os grupos, exceto aos sete dias. O conteúdo de proteína total foi maior no grupo OD-21 + OM em todos os períodos; o mesmo ocorreu com a atividade de ALP quando comparada com o grupo OD-21, além de apresentar resultados similares ao grupo MDPC-23. A mineralização foi maior em OD-21 + OM quando comparada com o controle negativo. A imunolocalização demonstrou expressão de DMP1 e ALP em MDPC-23 e OD-21 + OM, enquanto que todos os grupos foram positivos para OPN. A expressão gênica de DMP1 e ALP foi maior nas culturas de MDPC-23, enquanto que a de RUNX2 foi menor para estas células e maior no controle negativo. A expressão de OSTERIX foi menor em OD-21 + OM quando comparada aos outros grupos. Sugere-se que as células indiferenciadas da polpa da linhagem OD-21 apresentam potencial odontogênico e poderiam ser usadas para a engenharia tecidual.

Immunohistochemical expression of p63, epidermal growth factor receptor (EGFR) and notch-1 in radicular cysts, dentigerous cysts and keratocystic odontogenic tumors

The aim of this study was to assess the immunohistochemical expression of p63 protein, epidermal growth factor receptor (EGFR) and Notch-1 in the epithelial lining of radicular cysts (RC), dentigerous cysts (DC) and keratocystic odontogenic tumors (KOT). For this study, 35 RC, 22 DC and 17 KOT were used. The clinical and epidemiological data were collected from the patient charts filed in the Oral Pathology Laboratory, University of Ribeirão Preto, Brazil. Immunohistochemical reactions against the p63, EGFR and Notch-1 were performed in 3-µm-thick histological sections. The slides were evaluated according to the following criteria: negative: <5% of positive cells, low expression: 5-50% of positive cells, and high expression: >50% of positive cells. Moreover, the intensity of EGFR and Notch-1 expressions was also evaluated. Fisher's exact test and Spearman's correlation coefficients were used for statistical analysis, considering a significance level of 5%. Almost all cases demonstrated p63, EGFR and Notch-1 expressions. The p63 expression was significantly higher in KOT (p<0.001). Positive correlation between these immunomarkers was observed. These findings suggest the participation of p63, EGFR and Notch-1 in the development, maintenance and integrity of cystic odontogenic epithelial lining, favoring lesion persistence. The high expression of p63 in KOT suggests that it may be related to their more aggressive biological behavior and marked tendency to recurrence.

O objetivo deste estudo foi avaliar a expressão imunoistoquímica da proteína p63, receptor do fator de crescimento epidérmico (EGFR) e Notch-1 no revestimento epitelial de cistos radiculares (CR), cistos dentígeros (CD) e tumores odontogênicos queratocísticos (TOQ). Para este estudo, 35 CR, 22 CD e 17 TOQ foram utilizados. Os dados clínicos e epidemiológicos foram coletados das fichas dos pacientes arquivadas no Laboratório de Patologia Oral, Universidade de Ribeirão Preto, Brasil. Reações imunoistoquímicas contra p63, EGFR e Notch-1 foram realizadas em cortes histológicos de 3 µm. As lâminas foram avaliadas de acordo com os seguintes critérios: negativo <5% das células positivas, baixa expressão - 5%-50% das células positivas e alta expressão >50% das células positivas. Além disso, a intensidade de expressão de EGFR e Notch-1 foi também avaliada. Teste exato de Fisher e coeficiente de correlação de Spearman foram usados para análise estatística, considerando um nível de significância de 5%. Quase todos os casos demonstraram expressão de p63, EGFR e Notch-1. A expressão de p63 foi significativamente maior nos TOQ (p<0.001). Correlação positiva entre os imunomarcadores foi observada. Esses achados sugerem a participação de p63, EGFR e Notch-1 no desenvolvimento, manutenção e integridade do revestimento epitelial cístico, favorecendo a persistência das lesões. A alta expressão de p63 no TOQ sugere que ela pode estar relacionada ao comportamento biológico mais agressivo e marcada tendência a recorrência.

Análise da metilação e transcrição nos genes TLR-2 e CD14 na periodontite crônica / Analysis of methylation and transcription genes in the TLR-2 and CD14 in chronic periodontitis

A periodontite é uma infecção polimicrobiana e multifatorial, que resulta em danos aos tecidos periodontais, devido à complexa interação entre os peridontopatógenos e a resposta imunoinflamatória do hospedeiro. A metilação do DNA é caracterizada pela adição do grupo metil em citocinas em ilhas CpGs. Esse mecanismo epigenético pode modular a resposta do indivíduo, por interferir na expressão gênica de importantes mediadores inflamatórios. O objetivo desse estudo foi avaliar o padrão de metilação e expressão dos genes CD14 e TLR-2 em indivíduos com e sem periodontite crônica. Foram coletados 20 fragmentos de tecido gengival de indivíduos com periodontite crônica (grupo de periodontite) e 20 amostras de tecido gengival de indivíduos periodontalmente saudáveis (grupo controle). As amostras foram submetidas à avaliação histológica, extração de DNA e digestão por enzimas de restrição e a quantificação do DNA após a digestão foi quantificado por reação em cadeia de polimerase em tempo real (qPCR)...

Estudo do gene LHX4 em pacientes com hipopituitarismo associado a neuro-hipófise ectópica / Molecular analysis of the LHX4 gene in hypopituitary patients with ectopic posterior pituitary lobe

O fenótipo dos pacientes com mutação do LHX4 em humanos é caracterizado por hipopituitarismo associado a neuro-hipófise ectópica. O objetivo do estudo é verificar a presença de mutações no LHX4 em 63 pacientes com o citado fenótipo. Os pacientes foram submetidos à avaliação hormonal e por imagem através de ressonância magnética. A análise molecular incluiu amplificação do gene por PCR, sequenciamento automático direto e uso de enzima de restrição. Encontramos deficiência hipofisária múltipla em 81 por cento dos pacientes. A neuro-hipófise foi localizada na eminência média em 35 por cento dos pacientes com haste visualizada e em 33 por cento dos pacientes sem haste visualizada. Identificamos 5 novas variações alélicas e três delas caracterizamos como polimorfismos. Concluímos que mutações no LHX4 são causas raras de hipopituitarismo / LHX4 gene mutation phenotype is characterized by hypopituitarism associated to ectopic posterior pituitary lobe (EPL). To investigate clinical characteristics and LHX4 mutations in 63 patients with this phenotype, evaluation of pituitary function, imaging and molecular analysis of LHX4 using PCR, automatic sequencing and restriction enzyme were performed. Combined pituitary hormone deficiency was found in 81 per cent of patients. The EPL was located at median eminence in 35 per cent of patients with visualized pituitary stalk and in 33 per cent of patients without visualized pituitary stalk. We found five new allelic variations, three of them characterized as new polymorphisms without clear relationship to the phenotype. LHX4 gene mutations remain rare causes of hypopituitarism associated to EPL...

Utility of Thyroid Transcription Factor-1 and Cytokeratin 20 in Identifying the Origin of Metastatic Carcinomas of Cervical Lymph Nodes

The identification of primary location of a metastatic tumor is a difficult diagnostic problem and sometimes can be facilitated by the use of immunohistochemical markers. Thyroid transcription factor-1 (TTF-1) is a 38-kDa nuclear homeodomain transcription factor that is expressed specifically in lung or thyroid neoplasms. Cytokeratin 20 (CK20) is a 46-kDa low-molecular-weight cytokeratin that shows restricted expression in adenocarcinomas of the gastrointestinal tract (GIT) and transitional cell carcinomas of the urinary tract. We studied the immunohistochemical expression of TTF-1 and CK20 in 68 metastatic carcinomas in cervical lymph nodes. The primary sites were the lung in 29 cases, stomach in 13, colorectum in 3, and other sites in 23. TTF-1 expression was detected in 69.0% of metastatic lung carcinomas and none in metastatic GIT carcinomas, whereas CK20 expression was detected in 68.8% of metastatic GIT carcinomas and none of metastatic lung carcinomas. TTF-1 had a specificity of 0.95 and a sensitivity of 0.69 for metastatic lung carcinoma, whereas CK20 had a specificity of 1.00 and a sensitivity of 0.69 for metastatic GIT carcinoma. These results indicate that TTF-1 and CK20 should be the first choice as a component of antibody panel to prove or to exclude the lung and GIT origin, respectively, especially in patients presenting with metastatic carcinomas of unknown primary site.

Sequencing and promoter analysis of the nifENXorf3orf5fdxAnifQ operon from Azospirillum brasilense Sp7

A 40-kb DNA region containing the major cluster of nif genes has been isolated from the Azospirillum brasilense Sp7 genome. In this region three nif operons have been identified: nifHDKorf1Y, nifENXorf3orf5fdxAnifQ and orf2nifUSVorf4. The operons containing nifENX and nifUSV genes are separated from the structural nifHDKorf1Y operon by about 5 kb and 10 kb, respectively. The present study shows the sequence analysis of the 6045-bp DNA region containing the nifENX genes. The deduced amino acid sequences from the open reading frames were compared to the nif gene products of other diazotrophic bacteria and indicate the presence of seven ORFs, all reading in the same direction as that of the nifHDKorf1Y operon. Consensus sigma54 and NifA-binding sites are present only in the promoter region upstream of the nifE gene. This promoter is activated by NifA protein and is approximately two-times less active than the nifH promoter, as indicated by the ß-galactosidase assays. This result suggests the differential expression of the nif genes and their respective products in Azospirillum

Overexpression of Promyelocytic Leukemia Protein and Alteration of PML Nuclear Bodies in Early Stage of Hepatocarcinogenesis

Promyelocytic leukemia protein (PML) is a major component of PML nuclear bodies (PML NBs). Fusion of promyelocytic leukemia gene (PML) with retinoic acid receptor alpha gene with the t (15;17) translocation causes disassembly of PML NBs, leading to development of acute promyelocytic leukemia. In contrast, PML overexpression as well as different morphological changes of PML NBs were described in a few solid tumors. In this study, the expression of PML through the multistep hepatocarcinogenesis was analyzed in 95 cases of human hepatocellular carcinomas (HCCs) for comparison along with dysplastic nodules (DNs) and background liver cirrhosis (LC) or chronic hepatitis by immunohistochemistry and immunoblot. In addition, cases of HCCs were further evaluated according to their histologic grade and etiology. The amount of PML as well as the num-ber and size of PML NBs increased gradually through the progression from LC, DNs to HCCs. The overexpression of PML in HCCs was much more closely associated with HBV infection than HCV infection or alcoholic liver disease. The PML expression, however, was not correlated with histologic grade of HCCs. These results suggest that PML is involved in the early stage of multistep hepatocarcinogenesis, and HBV infection may be associated with the overexpression of PML and the morphological alteration of PML NBs.

Analysis of nm23 expression as a prognostic parameter in renal cell carcinoma

To identify the clinicopathological events including nm23 expression that underlies progression in renal cell carcinoma, a retrospective analysis of patients with renal cell carcinoma was performed. Ninety-eight cases of radical nephrectomies with extensive regional or para-aortic lymph node dissection were assessed for clinicopathological variables, and eighty-five cases underwent nm23/NDPK-A protein immunohistochemical staining. Significant parameters in survival were tumor size, histologic pattern, Fuhrman's nuclear grade, pathologic T(pT) stage, pathologic N stage, M stage, tumor thrombi, location of metastasis, and nm23 staining intensity. To assess the relationship with survival, the tumors with low and high nm23 expressions were compared. The fifty-nine patients with a high staining intensity had a significantly worse survival than did the twenty-six with a low staining intensity (p = 0.0015). Additionally nm23 staining intensity was correlated with tumor size, Fuhrman's nuclear grade, pT, and distant metastasis. Therefore, the immunostaining intensity of nm23 protein could be used as a prognostic parameter with an inverse correlation.

Expression of the nucleoside diphosphate kinase in human skin cancers: an immunohistochemical study

Expression of nucleoside diphosphate(NDP) kinase, which is homologous to the nm23 gene product in a variety of species, has been found to be inversely associated with metastatic potential. However, the relationship remains controversial according to the tumor cell types and experimental system, with conflicting results from different research groups. In order to determine whether NDP kinase expression serves as a marker for metastatic potential in human skin cancer, we assessed the levels of NDP kinase expression in 9 keratoacanthomas (KAs), 26 squamous cell carcinomas (SCCs), and 25 basal cell carcinomas (BCCs) using immunohistochemistry. The expression of NDP kinase was intense in KA and SCC compared with BCC. However, the difference of NDP kinase expression between KA and SCC was not statistically significant. And there was no statistically significant difference in NDP kinase expression between SCC with metastasis and SCC without metastasis. Our results contradict the hypothesis concerning the possible role of nm23 gene as a metastatic suppressor gene in human skin cancer. The mechanism of overexpression in various tumor cell types and its biological significance in cutaneous carcinogenesis remain to be determined.