Neurally mediated syncope diagnosis based on adenylate cyclase activity in Japanese patients.

The study aims to clarify the mechanism in patients with neurally mediated syncope (NMS), focusing on the adenylate cyclase (AC) activity level in lymphocytes. This study included 40 subjects: 22 healthy volunteers and 18 NMS patients. We investigated the changes in AC activity that occur during of syncope at rest and during the head-up tilt (HUT) test. We obtained 8 mL of blood at rest time and four times during the HUT test. Then, we measured the AC activity and the test reagent was added to the lymphocytes (10,000) and reacted for 30 min at room temperature. We were able to determine the standard value of AC activity when adrenaline (AD) and isoproterenol (IP) were added to lymphocytes. The results of our study showed one of the causes of NMS has a difference in AC activity level and classification of the patients into two different types of NMS was possible: either the vasodepressor type (VT) or mixed type (MT). At rest time, VT patients showed significantly higher AC activity (AD; 100 µM: p = 0.005, IP; 50 µM: p = 0.02) and MT patients showed significantly lower AC activity (AD; 10 µM: p = 0.02, IP; 50 µM: p = 0.004) than the average AC activity in healthy volunteers. Moreover, VT patients had significantly higher AC activity than healthy volunteers at the four points of the HUT test. MT patients had significantly lower AC activity (AD: p = 0.04 and IP: p = 0.04) than healthy volunteers at the rest time of HUT. Our study showed a significant difference in AC activities between NMS patients and healthy volunteers at rest. Therefore, a detailed NMS diagnosis can be made by examining AC activity levels in blood taken at rest time.

Analysis to Estimate Genetic Variations in the Idarubicin-Resistant Derivative MOLT-3.

Gene alterations are a well-established mechanism leading to drug resistance in acute leukemia cells. A full understanding of the mechanisms of drug resistance in these cells will facilitate more effective chemotherapy. In this study, we investigated the mechanism(s) of drug resistance in the human acute leukemia cell line MOLT-3 and its idarubicin-resistant derivative MOLT-3/IDR through complete mitochondrial and nuclear DNA analyses. We identified genetic differences between these two cell lines. The ND3 mutation site (p.Thr61Ile) in the mitochondrial DNA sequence was unique to MOLT-3/IDR cells. Moreover, we identified five candidate genes harboring genetic alterations, including GALNT2, via CGH array analysis. Sequencing of the GALNT2 exon revealed a G1716K mutation present within the stop codon in MOLT-3/IDR cells but absent from MOLT-3 cells. This mutation led to an additional 18 amino acids in the protein encoded by GALNT2. Using real-time PCR, we determined an expression value for this gene of 0.35. Protein structure predictions confirmed a structural change in GALNT2 in MOLT-3/IDR cells that corresponded to the site of the mutation. We speculate that this mutation may be related to idarubicin resistance.

Mutations in the Mitochondrial ND1 Gene Are Associated with Postoperative Prognosis of Localized Renal Cell Carcinoma.

We analyzed mutations in the mitochondrial ND1 gene to determine their association with clinicopathological parameters and postoperative recurrence of renal cell carcinoma (RCC) in Japanese patients. Among 62 RCC cases for which tumor pathology was confirmed by histopathology, ND1 sequencing revealed the presence of 30 mutation sites in 19 cases. Most mutations were heteroplasmic, with 16 of 19 cases harboring one or more heteroplasmic sites. Additionally, 12 sites had amino acid mutations, which were frequent in 10 of the cases. The 5-year recurrence-free survival (RFS) rate was significantly worse in patients with tumors >40 mm in diameter (p = 0.0091), pathological T (pT) stage ≥3 (p = 0.0122), Fuhrman nuclear atypia grade ≥III (p = 0.0070), and ND1 mutations (p = 0.0006). Multivariate analysis using these factors revealed that mutations in ND1 were significantly associated with the 5-year RFS rate (p = 0.0044). These results suggest a strong correlation between the presence of ND1 mutations in cancer tissue and postoperative recurrence of localized RCC in Japanese patients.

Production of a Locus- and Allele-Specific Monoclonal Antibody for the Characterization of SLA-1*0401 mRNA and Protein Expression Levels in MHC-Defined Microminipigs.

The class I major histocompatibility complex (MHC) presents self-developed peptides to specific T cells to induce cytotoxity against infection. The MHC proteins are encoded by multiple loci that express numerous alleles to preserve the variability of the antigen-presenting ability in each species. The mechanism regulating MHC mRNA and protein expression at each locus is difficult to analyze because of the structural and sequence similarities between alleles. In this study, we examined the correlation between the mRNA and surface protein expression of swine leukocyte antigen (SLA)-1*0401 after the stimulation of peripheral blood mononuclear cells (PBMCs) by Staphylococcus aureus superantigen toxic shock syndrome toxin-1 (TSST-1). We prepared a monoclonal antibody (mAb) against a domain composed of Y102, L103 and L109 in the α2 domain. The Hp-16.0 haplotype swine possess only SLA-1*0401, which has the mAb epitope, while other haplotypes possess 0 to 3 SLA classical class I loci with the mAb epitopes. When PBMCs from SLA-1*0401 homozygous pigs were stimulated, the SLA-1*0401 mRNA expression level increased until 24 hrs and decreased at 48 hrs. The kinetics of the interferon regulatory transcription factor-1 (IRF-1) mRNA level were similar to those of the SLA-1*0401 mRNA. However, the surface protein expression level continued to increase until 72 hrs. Similar results were observed in the Hp-10.0 pigs with three mAb epitopes. These results suggest that TSST-1 stimulation induced both mRNA and surface protein expression of class I SLA in the swine PBMCs differentially and that the surface protein level was sustained independently of mRNA regulation.

MicroRNA Stability in FFPE Tissue Samples: Dependence on GC Content.

MicroRNAs (miRNAs) are small non-coding RNAs responsible for fine-tuning of gene expression at post-transcriptional level. The alterations in miRNA expression levels profoundly affect human health and often lead to the development of severe diseases. Currently, high throughput analyses, such as microarray and deep sequencing, are performed in order to identify miRNA biomarkers, using archival patient tissue samples. MiRNAs are more robust than longer RNAs, and resistant to extreme temperatures, pH, and formalin-fixed paraffin-embedding (FFPE) process. Here, we have compared the stability of miRNAs in FFPE cardiac tissues using next-generation sequencing. The mode read length in FFPE samples was 11 nucleotides (nt), while that in the matched frozen samples was 22 nt. Although the read counts were increased 1.7-fold in FFPE samples, compared with those in the frozen samples, the average miRNA mapping rate decreased from 32.0% to 9.4%. These results indicate that, in addition to the fragmentation of longer RNAs, miRNAs are to some extent degraded in FFPE tissues as well. The expression profiles of total miRNAs in two groups were highly correlated (0.88

MicroRNA deep sequencing reveals chamber-specific miR-208 family expression patterns in the human heart.

BACKGROUND: Heart chamber-specific mRNA expression patterns have been extensively studied, and dynamic changes have been reported in many cardiovascular diseases. MicroRNAs (miRNAs) are also important regulators of normal cardiac development and functions that generally suppress gene expression at the posttranscriptional level. Recent focus has been placed on circulating miRNAs as potential biomarkers for cardiac disorders. However, miRNA expression levels in human normal hearts have not been thoroughly studied, and chamber-specific miRNA expression signatures in particular remain unclear. METHODS AND RESULTS: We performed miRNA deep sequencing on human paired left atria (LA) and ventricles (LV) under normal physiologic conditions. Among 438 miRNAs, miR-1 was the most abundant in both chambers, representing 21% of the miRNAs in LA and 26% in LV. A total of 25 miRNAs were differentially expressed between LA and LV; 14 were upregulated in LA, and 11 were highly expressed in LV. Notably, the miR-208 family in particular showed prominent chamber specificity; miR-208a-3p and miR-208a-5p were abundant in LA, whereas miR-208b-3p and miR-208b-5p were preferentially expressed in LV. Subsequent real-time polymerase chain reaction analysis validated the predominant expression of miR-208a in LA and miR-208b in LV. CONCLUSIONS: Human atrial and ventricular tissues display characteristic miRNA expression signatures under physiological conditions. Notably, miR-208a and miR-208b show significant chamber-specificity as do their host genes, α-MHC and ß-MHC, which are mainly expressed in the atria and ventricles, respectively. These findings might also serve to enhance our understanding of cardiac miRNAs and various heart diseases.

MicroRNA Stability in Postmortem FFPE Tissues: Quantitative Analysis Using Autoptic Samples from Acute Myocardial Infarction Patients.

MicroRNAs (miRNAs) are very short (18-24 nucleotides) nucleic acids that are expressed in a number of biological tissues and have been shown to be more resistant to extreme temperatures and pH compared to longer RNA molecules, like mRNAs. As miRNAs contribute to diverse biological process and respond to various kinds of cellular stress, their utility as diagnostic biomarkers and/or therapeutic targets has recently been explored. Here, we have evaluated the usefulness of miRNA quantification during postmortem examination of cardiac tissue from acute myocardial infarction (AMI) patients. Cardiac tissue was collected within one week of the patient's death and either frozen (19 samples) or fixed in formalin for up to three years (36 samples). RNA integrity was evaluated with an electropherogram, and it appears that longer RNAs are fragmented after death in the long-term fixed samples. Quantitative PCR was also performed for seven miRNAs and three other small RNAs in order to determine the appropriate controls for our postmortem analysis. Our data indicate that miR-191 and miR-26b are more suitable than the other types of small RNA molecules as they are stably detected after death and long-term fixation. Further, we also applied our quantitation method, using these endogenous controls, to evaluate the expression of three previously identified miRNA biomarkers, miR-1, miR-208b, and miR-499a, in formalin-fixed tissues from AMI patients. Although miR-1 and miR-208b decreased (1.4-fold) and increased (1.2-fold), respectively, in the AMI samples compared to the controls, the significance of these changes was limited by our sample size. In contrast, the relative level of miR-499a was significantly decreased in the AMI samples (2.1-fold). This study highlights the stability of miRNAs after death and long-term fixation, validating their use as reliable biomarkers for AMI during postmortem examination.

Relationship between human evolution and neurally mediated syncope disclosed by the polymorphic sites of the adrenergic receptor gene α2B-AR.

The objective of this study was to clarify the effects of disease on neurally mediated syncope (NMS) during an acute stress reaction. We analyzed the mechanism of the molecular interaction and the polymorphisms of the alpha-2 adrenoreceptor (α2B-AR) gene as the potential psychiatric cause of incentive stress. We focused on the following three genotypes of the repeat polymorphism site at Glu 301-303 in the α2B-AR gene: Glu12/12, Glu12/9, and Glu9/9. On the basis of our clinical research, NMS is likely to occur in people with the Glu12/9 heterotype. To verify this, we assessed this relationship with the interaction of Gi protein and adenylate cyclase by in silico analysis of the Glu12/9 heterotype. By measuring the difference in the dissociation time of the Gi-α subunit twice, we found that the Glu12/9 heterotype suppressed the action of adenylate cyclase longer than the Glu homotypes. As this difference in the Glu repeat number effect is thought to be one of the causes of NMS, we investigated the evolutionary significance of the Glu repeat number. Glu8 was originally repeated in simians, while the Glu12 repeats occurred over time during the evolution of bipedalism in humans. Taken with the Glu12 numbers, NMS would likely become a defensive measure to prevent significant blood flow to the human brain.

Cloning and transcriptional expression of mouse mannosyltransferase IV/V cDNA, which is involved in the synthesis of lipid-linked oligosaccharides.

We cloned the mouse mannosyltransferase IV/V gene (mALG11) from FM3A cells by a bioinformatic approach. The ORF contained 1476 bp encoding 492 amino acids. The cloned mALG11 complemented the growth defect of the Saccharomyces cerevisiae ALG11Δ mutant. In addition, we detected a variant cDNA by alternate splicing that had an additional four-nucleotide ATGC insertion at base 276 of the ORF. Consequently the variant cDNA encoded a truncated protein with 92 amino acids, lacking the glycosyltransferase group-1 domain. The variant cDNA occurs in many mouse strains according to EST database searches. Moreover, we detected it in FM3A cDNA, but we did not detect any such variants in the human EST database or in HeLa cDNA, although human ALG11 (hALG11) genomic DNA has the same sequence around the intron-exon boundaries as those of mALG11 genomic DNA. Hence, we concluded that there is different transcriptional control mechanism between mALG11 and hALG11.

Vasculogenic conditioning of peripheral blood mononuclear cells promotes endothelial progenitor cell expansion and phenotype transition of anti-inflammatory macrophage and T lymphocyte to cells with regenerative potential.

BACKGROUND: Cell-based therapies involving mononuclear cells (MNCs) have been developed for vascular regeneration to treat ischemic diseases; however, quality control of therapeutic MNCs has not been evaluated. We investigated the therapeutic potential of peripheral blood (PB) MNCs, operated by recently developed quality and quantity (QQ) culture of endothelial progenitor cells (EPCs). METHODS AND RESULTS: PBs were collected from healthy volunteers; peripheral blood mononuclear cells (PBMNCs) isolated from these PBs were subjected to QQ culture for 7 days with medium containing stem cell factor, thrombopoietin, Flt-3 ligand, vascular endothelial growth factor, and interleukin-6. The resulting cells (QQMNCs) in EPC colony-forming assay generated significantly more definitive EPC colonies than PBMNCs. In flow cytometry, macrophages and helper T lymphocytes of QQMNCs became phenotypically polarized into angiogenic, anti-inflammatory, and regenerative subsets: classical M1 to alternative M2; T helper (Th)1 to Th2; angiogenic or regulatory T-cell expansion. Quantitative real-time polymerase chain reaction (qRT-PCR) assay revealed the predominant proangiogenic gene expressions in QQMNCs versus PBMNCs. Using murine ischemic hindlimb models, the efficacy of QQMNC intramuscular transplantation (Tx) was compared to that of PBMNCTx, cultured "early EPC" Tx (eEPCTx), and granulocyte colony-stimulating factor mobilized CD34(+) cell Tx (GmCD34Tx). Laser Doppler imaging revealed the blood perfusion recovery in ischemic hindlimbs after QQMNCTx superior to after PBMNCTx and eEPCTx, but also earlier than after GmCD34Tx. Histological evaluations and qRT-PCR assays in ischemic hindlimbs demonstrated that QQMNCTx, similarly to GmCD34Tx, enhanced angiovasculogenesis and myogenesis, whereas it preponderantly inhibited inflammation and fibrosis versus PBMNCTx and eEPCTx. CONCLUSIONS: QQ culture potentiates the ability of PBMNCs to promote regeneration of injured tissue; considering the feasible cell preparation, QQ culture-treated PBMNCs may provide a promising therapeutic option for ischemic diseases. CLINICAL TRIAL REGISTRATION URL: irb.med.u-tokai.ac.jp/d/2/monthly/2010.html; IRB No.: 10R-020.URL: irb.med.u-tokai.ac.jp/d/2/monthly/201312.html; IRB No.: 13R228.

Senescent case of cholesterol ester storage disease that progressed to liver cirrhosis with a novel mutation (N250H) of lysosomal acid lipase gene.

The patient, a 69-year-old man, had a chief complaint of hepatomegaly. The liver was palpated four fingerbreadths below the costal margin, and the spleen was three fingerbreadths below the costal margin. There were no other abnormal findings. Laparoscopy showed that the liver resembled an orange-yellow crayon in appearance and was nodular. The pathological findings of the liver biopsy tissue were consistent with liver cirrhosis. Inside the fibrous septum was an apparent aggregation of enlarged macrophages that phagocytosed lipid components, as well as enlarged Kupffer cells that phagocytosed lipid droplets. Electron microscopy showed the lipid droplets to have a moth-eaten appearance. Using monocytes extracted from the peripheral blood, acid lipase activity was measured by fluorescence spectrometry using 4-methylumbelliferone palmitate as a substrate. This patient's human lysosomal acid lipase activity was 0.020 nM/min per 10(6) cells, corresponding to 5.9% of that in healthy subjects (0.332 ± 0.066 nM/min per 10(6) cells). Cholesterol ester storage disease was therefore diagnosed. The acid lipase A base sequence obtained from leukocytes by direct sequencing was compared with a library. This patient had a point mutation of N250H/N250H in exon 7, a novel gene abnormality that has not previously been reported.

Porcine MHC classical class I genes are coordinately expressed in superantigen-activated mononuclear cells.

The expression of the major histocompatibility complex (MHC) classical class I genes is important for the adaptive immune response to target virus-infected cells and cancer cells. The up-regulation of the MHC is achieved by hormonal/cytokine signals including IFN-γ-inducible elements. The swine leukocyte antigen (SLA), the MHC class I region of pigs, consists of the duplicated classical class I genes, SLA-1, SLA-2 and SLA-3, but the molecular mechanisms involved in their up-regulation after T cell stimulation have not been fully elucidated. In order to better understand some of the putative regulatory mechanisms of SLA class I gene expression in activated T cells, we examined the coordinated expression of the SLA classical class I, IFN-γ and interferon regulatory factor-1 (IRF-1) genes in the peripheral blood mononuclear cells (PBMCs) of SLA homozygous Clawn miniature swine stimulated for 72 h with either IFN-γ or an enterotoxin produced by Staphylococcus aureus. This enterotoxin, toxic shock syndrome-1 (TSST-1), is known to act as a superantigen (sAG) to activate the T cells in various vertebrate species. We showed by using mAbs and flow cytometry that the CD4(+)CD25(+) cell number of swine PBMCs was also increased by TSST-1 and to a lesser degree by IFN-γ. Time course analyses of the expression of the IFN-γ, IRF-1 and the three classical class I genes, SLA-1, SLA-2, and SLA-3, in PBMCs by quantitative real-time PCR revealed a transitory response to TSST-1 or IFN-γ stimulation. The IFN-γ mRNA levels in the PBMCs were continuously up-regulated over the first 48 h by TSST-1 or IFN-γ. In contrast, SLA class I expression moderately increased at 24h and then decreased to a baseline level or less at 72 h of IFN-γ or TSST-1 stimulation. The three classical SLA class I genes showed similar expression kinetics, although SLA-3 mRNA level was consistently lower than those of SLA-1 and -2. The expression of IRF-1, a modulator of SLA expression, showed similar kinetics to those of the three classical SLA class I genes. The expression profiles detected by flow cytometry of the SLA molecules on the cell surface of PBMCs were maintained at a consistently high level during cell stimulation with either TSST-1 or IFN-γ, which was distinct from the kinetics of mRNA expression. These results showed that miniature swine SLA class I mRNA expression was effectively and equally up-regulated among the three loci and coordinately with IRF-1 gene expression after stimulation of T cell activation by sAG or IFN-γ.

Remarkable expression in the colon adenocarcinoma of Hmat-Xa, a human mannosyltransferase-like gene, that is homologous to drosophila gene GC15914.

We cloned a novel human mannosyltransferase-like gene, designated Hmat-Xa, as a gene homologous to the Drosophila GC15914 gene encoding the 9QVXN0 protein: see "Project Report for FY2002 on the 'Construction of Libraries of Human Genes Participating in Glycosylation' project" 43-45 (2003), New Energy and Industrial Technology Development Organization (NEDO), NEDO and Research Association for Biotechnology, Tokyo, Japan (in Japanese). After that, the GTDC1 gene, as reported by Zhao et al., DNA Cell Biol., 23, 183-187 (2004), was found to be the same as the Hmat-Xa gene. Domain EXFGI/L/VX(2)L/VE in the Hmat-Xa protein, also present in both human mannosyltransferase II/III and mannosyltransferase IV/V, which are involved in the synthesis of lipid-linked oligosaccharides, and some bacterial mannosyltransferases. A real-time PCR study of Hmat-Xa mRNA expression in human normal and tumor multiple tissue cDNA identified its tissue-specific expression and its remarkable expression in colon adenocarcinoma as compared to the normal counterpart. Thus the elevated expression of Hmat-Xa might serve as a candidate marker for colon adenocarcinoma.

Administration of hematopoietic cytokines increases the expression of anti-inflammatory cytokine (IL-10) mRNA in the subacute phase after stroke.

We investigated the effect of the subcutaneous administration of hematopoietic cytokines, granulocyte colony-stimulating factor (G-CSF)+stem cell factor (SCF), on mRNA expression of tissue cytokines in the acute or subacute phase after focal ischemia in male C57 BL/6J mice. The expression of IL-10 mRNA was elevated at 4-14 days after occlusion when cytokines were given in the acute phase (days 1-10). The expression of IL-10 mRNA was markedly elevated at 14 days after occlusion, then remained high until 28 days when cytokines were given in the subacute phase (days 11-20). However, there were no significant changes in IL-6, TGF-beta1, TNF, G-CSF, SCF and iNOS expression following either acute- or subacute-phase treatment. Further, hematopoietic cytokine treatment in the subacute phase, but not in the acute phase, reduced ED1-positive microglia/macrophages in the infarcted brain. Our recent study showed that the subacute-phase treatment is effective for functional recovery, enhancing generation of neuronal cells from both bone-marrow-derived and neural stem/progenitor cells. Taken together, these results suggest that cytokine treatment in the subacute phase may provide a favorable microenvironment for neurogenesis after ischemic stroke through the up-regulation of IL-10.

Post-ischemic delayed expression of hepatocyte growth factor and c-Met in mouse brain following focal cerebral ischemia.

We investigated long-term changes in the expression of protein and mRNA of hepatocyte growth factor (HGF) and its receptor c-Met in mouse brain after permanent occlusion of the middle cerebral artery, by using immunohistochemistry and quantitative reverse transcription-polymerase chain reaction. HGF-immunopositive cells were observed in the periinfarct region from 4 days after occlusion, peaking at 14-28 days. The area containing HGF-immunopositive cells continued to expand until 28 days after occlusion. c-Met-immunopositive cells were observed exclusively at the periinfarct region at 7 and 14 days after occlusion. At 28 days after occlusion, there were many c-Met-immunopositive cells in the widespread periinfarct region. Triple immunohistochemical staining by using confocal laser scanning microscopy (CLSM) demonstrated that most of the HGF-immunopositive cells were localized to reactive astrocytes. The c-Met-immunopositive cells were also localized to reactive astrocytes. HGF mRNA was upregulated exclusively in the periinfarct region at 14 days. c-Met mRNA was upregulated in the periinfarct region from as late as 28 days after occlusion. Thus, HGF and c-Met show delayed expression in the periinfarct region at both protein and mRNA levels after induction of ischemia. Because HGF was recently shown to play critical roles in angiogenesis and neurotrophic activities, the temporal profiles of their expression may imply the involvement of HGF in the process of post-ischemic brain tissue repair.