Gait analysis combined with the expression of TGF-β1, TGF-β3 and CREB during Achilles tendon healing in rat / 中华创伤杂志(英文版)

PURPOSE@#To observe the changes of gait behavior and the expression of wound healing factors of transforming growth factor-β1 (TGF-β1), TGF-β3 and cAMP response element binding protein-1 (CREB-1) during the healing of Achilles tendon in a rat model, and to investigate whether gait analysis can be used to evaluate the tendon healing.@*METHODS@#Achilles tendon of 40 healthy male Sprague-Dawley rats were transected and sutured to establish the Achilles tendon injury (ATI) model. They were randomly divided into 4 groups based on the observational time point at 1, 2, 4 and 6 weeks after injury (n = 10 for each group). Before modeling, 9 rats were randomly selected for CatWalk gait analysis, which contained step cycle, single stance time and average speed. Data were recorded as the normal controls. After then, ATI models were established in the left hind limbs of the all 40 rats (ATI group), while the right hind limbs were only cut and sutured without injury of the Achilles tendon (sham operation group). At 1, 2, 4 and 6 weeks after injury, the gait behavior of the corresponding group of rats (n = 9) as observed and recorded by CatWalk platform. After then, the rats were sacrificed and Achilles tendon of both limbs was harvested. The tendon healing was observed by gross anatomy and histological examination, and the protein and mRNA expression of TGF-β1, TGF-β3, CREB-1 were observed by immunohistochemistry and qPCR. The results of tendon gross grading were analyzed by Wilcoxon rank sum test, and other data were analyzed by one-way analysis of variance among multiple groups.@*RESULTS@#Compared with normal controls, all gait indexes (step cycle, single stance time and average speed) were greatly affected following ATI, which however improved with time. The step cycle was significantly lower at 1, 2 and 4 weeks after ATI (compared with normal controls, all p  0.05). The single stance time of the ATI group was significantly shorter at 1 and 2 weeks after operation ((0.078 ± 0.010) s at 1 week, (0.078 ± 0.020) s at 2 weeks, all p < 0.001) and revealed no significant difference at 4 weeks (p = 0.120). The average speed of ATI group at 1, 2, 4, 6 weeks was significantly lower than that in the normal control group (all p < 0.001). Gross observation showed that the grade of local scar adhesion in ATI group increased significantly at 2, 4 and 6 weeks, compared with the sham operation group (all p < 0.001). Extensive adhesion was formed at 6 weeks after ATI. The results of HE staining showed that the number of fibroblast increased gradually and arranged more orderly in ATI group at 1, 2 and 4 weeks (all p < 0.001), and decreased at 6 weeks, but it was still significantly higher than that of the sham operation group (p < 0.001). Immunohistochemistry showed that the positive expression of TGF-β1, TGF-β3, CREB-1 in ATI group was higher than that in the sham operation group at 4 time points (all p < 0.05), which reached the peak at 2 weeks after operation and decreased at 4 weeks (p = 0.002, p < 0.001, p = 0.041, respectively). The results of qPCR suggested that the mRNA expression of TGF-β1, TGF-β3, CREB-1 in ATI group was higher than that in the sham operation group at all-time points (all p < 0.05), which reached the peak at 2 weeks after operation, decreased at 4 weeks, and significantly decreased at 6 weeks (all p < 0.001).@*CONCLUSION@#Gait behavior indexes are associated with Achilles tendon healing. The study gives an insight of TGF-β1, TGF-β3, CREB-1 changes in the coursing of Achilles tendon healing and these cytokines may be able to be used to regulate the Achilles tendon healing.

Clinical and genetic analysis of two cases with Rubinstein-Taybi syndrome / 中华医学遗传学杂志

OBJECTIVE@#To summarize the clinical characteristics and identify gene mutations of 2 probands with Rubinstein-Taybi syndrome (RSTS).@*METHODS@#Clinical characteristics of 2 probands with Rubinstein-Taybi syndrome were summarized. Genomic DNA was extracted from peripheral blood samples from the patients and their parents. Genomic DNA was subjected to whole exome next generation sequencing. Suspected variants were confirmed by Sanger sequencing.@*RESULTS@#The two patients were characterized by typical facial features, broad thumbs and big toes, intellectual disability, and postnatal growth retardation. Two variants of the CREBBP gene, namely c.3779+1G>A and c.5052_c.5053insT, were respectively identified in the 2 patients. Among these, c.3779+1G>A was a previously known pathological mutation, while c.5052_c.5053insT was unreported previously. Both variants were predicted to be pathological.@*CONCLUSION@#Two cases of Rubinstein-Taybi syndrome were diagnosed, which facilitated the diagnosis and genetic counselling.

Clinical features of Rubinstein-Taybi syndrome and novel mutation in the CREBBP gene: an analysis of one case / 中国当代儿科杂志

The patient was a girl aged 3 years and 8 months with normal body length and body weight at birth. The girl had feeding difficulty after birth. Her height, body weight, and head circumference were below the 3rd percentile. She had intellectual disability and an unusual facies manifesting as arched shaggy eyebrows, down-slanting palpebral fissures, and broad nasal bridge, but had no a beaked nose, broad thumbs, or big toes. These clinical manifestations were basically consistent with Rubinstein-Taybi syndrome (RSTS). Gene sequencing identified a heterozygous splice site mutation, c.3779T+1G>T, in the CREBBP gene, which did not exist in her parents. Therefore, a definite diagnosis of RSTS was made. The mutation c.3779T+1G>T had not been reported in the Human Gene Mutation Database and was identified as a novel pathogenic mutation. Then the girl was given rehabilitation training for delayed language and motor development. The girl has been followed up for 3 months in the outpatient department, but the effect of rehabilitation treatment has not been evaluated.

Cardioprotection against experimental myocardial ischemic injury using cornin

Phosphorylated-cyclic adenosine monophosphate response element-binding protein (Phospho-CREB) has an important role in the pathogenesis of myocardial ischemia. We isolated the iridoid glycoside cornin from the fruit of Verbena officinalis L, investigated its effects against myocardial ischemia and reperfusion (I/R) injury in vivo, and elucidated its potential mechanism in vitro. Effects of cornin on cell viability, as well as expression of phospho-CREB and phospho-Akt in hypoxic H9c2 cells in vitro, and myocardial I/R injury in vivo, were investigated. Cornin attenuated hypoxia-induced cytotoxicity significantly in H9c2 cells in a concentration-dependent manner. Treatment of H9c2 cells with cornin (10 µM) blocked the reduction of expression of phospho-CREB and phospho-Akt in a hypoxic condition. Treatment of rats with cornin (30 mg/kg, iv) protected them from myocardial I/R injury as indicated by a decrease in infarct volume, improvement in hemodynamics, and reduction of severity of myocardial damage. Cornin treatment also attenuated the reduction of expression of phospho-CREB and phospho-Akt in ischemic myocardial tissue. These data suggest that cornin exerts protective effects due to an increase in expression of phospho-CREB and phospho-Akt.

Acetylated Histone Expressions of the Primary Hippocampal Neurons in Rats Reduced by siCBP Lentivirus / 生物医学工程学杂志

This study aims to construct the recombinant lentivirus vector containing specific small interfering RNA (siRNA) targeting rat CREB binding protein(CBP)gene and to identify its function of inhibiting the expressions of acetylated histone in primarily cultured hippocampal neurons. Firstly, we constructed four kinds of recombinant lentivirus siCBP. And then we used them to infect the primarily cultured hippocampal neurons, and performed real-time PCR, western blot respectively to detect the expressions of CBP. Afterwards, the most effective lentivirus siCBP was used to infect the primarily cultured hippocampal neurons, and then the HAT activity and protein expressions of acetylated histone Ac-H3, Ac-H4 of the neurons were examined. By using PCR, endonuclease cutting and gene sequencing, we confirmed that the target genes were correctly cloned in lentivirus vector. Besides, CBP mRNA and protein expressions in neurons were found to be with varying degrees of decreases after infections of the four kinds of lentivirus siCBP. Furthermore, the representative and most effective lentivirus GR806 could effectively inhibit the HAT activity and the protein expressions of Ac-H3, Ac-H4 in neurons. It provides the experimental basis for the subsequent application of siCBP to clarify the effects and corresponding molecular mechanism of the CBP-dependent histone acetylation on learning and memory function in hippocampus.

MiRNA-381 inhibits the invasion of renal carcinoma and the underlying mechanisms / 中南大学学报(医学版)

OBJECTIVE@#To determine the inhibitory effect of miRNA-381 on renal carcinoma invasion and to explore the underlying mechanisms.
@*METHODS@#After up-regulation of miRNA-381, the inhibitory effect of miR-381 on cell invasion was investigated. We screened the target genes of miRNA-381 in a database (starBase) through combination of five programs including targetscan, picTar, RNA22, PITA and miRanda. Then, the predicted targeting genes were verified by the dual luciferase reporter assay. We also examined the expression of miRNA-381 and its target genes in renal cancer cells and tissues.
@*RESULTS@#Transfection and up-regulation of miRNA-381 resulted in a significant decrease in trans-membrane cell numbers and the ability of renal cell invasion. Bioinformatics analysis showed that CREB binding protein (CBP), β-catenin and lymphoid enhancer binding factor-1 (LEF-1) were the potential targets of miRNA-381. In the luciferase reporter gene system, co-transfection of miRNA-381 with the 3'UTR of wild-type target gene led to a significant decrease in luciferase activity. The expression of miRNA-381 was decreased in various renal cancer cells, and it was particularly lower in highly metastatic cell lines (786-OHM). On the contrary, the expression levels of miRNA-381 target genes (CBP, β-catenin and LEF-1) were significantly increased in cells and tissues.
@*CONCLUSION@#MiRNA-381 can inhibit cell invasion in renal cancer by block the function of CBP, β-catenin and LEF-1.

[Evaluating the effect of Salvia hydrangea extract on memory improvement, apoptosis reduction and CREB phosphorylation in animal model of Alzheimer's disease in male rats]

Alzheimer's disease [AD] is the most familiar disease, which leads to dementia. There are many studies to find the pretreatment and treating drugs in this disease. Many herbs show the protective effect against AD. The protective role of Salvia genus in neurodegenerative disease is well established. In this study, we evaluated the protective role of Salvia hydrangea [S. hydrangea] extract on AD model. Rats were gavaged for 10 days by S. hydrangea. Subsequently, rats were injected by amyloid beta and were tested by shuttle box. The molecular level of Ca[2+]/cAMP response element binding [CREB], caspase-3 antioxidant and acetylcholine esterase activity were evaluated. Our results demonstrated that S. hydrangea could improve memory in AD models rats. S. hydrangea increased antioxidant activity and CREB phosphorylation in pretreated rats. Treating by S. hydrangea decreased neuronal apoptosis in the hippocampus and frontal cortex. Chromatographic analysis showed that S. hydrangea has phenolic compounds such as gentisic acid, chlorogenic acid, caffeic and syringic acid. Our results suggested that S. hydrangea contain a dominant potential in prevention of AD

CREBBP gene mutation in two boys with Rubinstein-Taybi syndrome / 中华儿科杂志

<p><b>OBJECTIVE</b>To investigate the clinical and genetic features of 2 patients with Rubinstein-Taybi syndrome.</p><p><b>METHOD</b>Using next generation sequencing (NGS) the CREBBP and EP300 genes of 2 children who were diagnosed as Rubinstein-Taybi syndrome at Peking Union Medical College Hospital. The mutations identified by NGS were verified by PCR were analyzed.</p><p><b>RESULT</b>The 2 patients at the age of 5 months and 4.5 years manifested short stature (the height were 60 cm and 99 cm respectively), low hairline, thick and dense hair and eyebrows, long lash, epicanthus of both eyes, protruded supercilliary arch, broad and flat thumbs and halluces, and particular facial abnormalities. Patient 2 had language retardation besides. One missense mutation of c.3535A>G, p.Ser1179Gly was found in CREBBP gene in patient 1 and one microdeletion mutation of c.4995_4999delCGCCT, p. Ala1666Pro fs66x was found inpatient 2. Both mutations were reported for the first time.</p><p><b>CONCLUSION</b>Rubinstein-Taybi syndrome is characterized by mental and growth retardation, wide and flat thumbs and first toes, and dysmorphic facial features. CREBBP is one of the causative genes. Mutation detection on CREBBP gene can confirm the diagnosis of Rubinstein-Taybi syndrome.</p>

Rubinstein-Taybi Syndrome; a case report

Rubinstein-Taybi Syndrome is a rare genetic disorder with characteristic features including downward slanting palpebral fissures, broad thumbs and halluces, and mental retardation. Systemic features may involve cardiac, auditory, ophthalmic, endocrine, nervous, renal and respiratory systems. This syndromeis sporadic in nature and has been linked to microdeletion at 16p 13.3 encoding CREB-binding protein gene [CREBBP]. We report a 15-years-old girl, a known case of chronic renal failure, with downward slanting palpebral fissures towardthe ears, hypertelorism, short stature, beaked nose, micrognathia, strabismus, dental anomalies, large toes, broad thumbs, and mental retardation

Butyrate regulates leptin expression through different signaling pathways in adipocytes

Leptin is an adipocytokine that regulates body weight, and maintains energy homeostasis by promoting reduced food intake and increasing energy expenditure. Leptin expression and secretion is regulated by various factors including hormones and fatty acids. Butyrate is a short-chain fatty acid that acts as source of energy in humans. We determined whether this fatty acid can play a role in leptin expression in fully differentiated human adipocytes. Mature differentiated adipocytes were incubated with or without increasing concentrations of butyrate. RNA was extracted and leptin mRNA expression was examined by Northern blot analysis. Moreover, the cells were incubated with regulators that may affect signals which may alter leptin expression and analyzed with Northern blotting. Butyrate stimulated leptin expression, and stimulated mitogen activated protein kinase (MAPK) and phospho-CREB signaling in a time-dependent manner. Prior treatment of the cells with signal transduction inhibitors as pertusis toxin, Gi protein antagonist, PD98059 (a MAPK inhibitor), and wortmannin (a PI3K inhibitor) abolished leptin mRNA expression. These results suggest that butyrate can regulate leptin expression in humans at the transcriptional level. This is accomplished by: 1) Gi protein-coupled receptors specific for short-chain fatty acids, and 2) MAPK and phosphatidylinositol-3-kinase (PI3K) signaling pathways.

Evaluation of the immune humoral response of Brazilian patients with Rubinstein-Taybi syndrome

Rubinstein-Taybi syndrome (RTS) is a rare developmental disorder characterized by craniofacial dysmorphisms, broad thumbs and toes, mental and growth deficiency, and recurrent respiratory infections. RTS has been associated with CREBBP gene mutations, but EP300 gene mutations have recently been reported in 6 individuals. In the present study, the humoral immune response in 16 RTS patients with recurrent respiratory infections of possible bacterial etiology was evaluated. No significant differences between patients and 16 healthy controls were detected to explain the high susceptibility to respiratory infections: normal or elevated serum immunoglobulin levels, normal salivary IgA levels, and a good antibody response to both polysaccharide and protein antigens were observed. However, most patients presented high serum IgM levels, a high number of total B cell and B subsets, and also high percentiles of apoptosis, suggesting that they could present B dysregulation. The CREBBP/p300 family gene is extremely important for B-cell regulation, and RTS may represent an interesting human model for studying the molecular mechanisms involved in B-cell development.

A case of Rubinstein-Taybi Syndrome with a CREBbinding protein gene mutation / 소아과

Rubinstein-Taybi syndrome (RTS) is a congenital disorder characterized by typical facial features, broad thumbs and toes, with mental retardation. Additionally, tumors, keloids and various congenital anomalies including congenital heart defects have been reported in RTS patients. In about 50% of the patients, mutations in the CREB binding protein (CREBBP) have been found, which are understood to be associated with cell growth and proliferation. Here, we describe a typical RTS patient with Arnold-Chiari malformation. A mutation in the CREBBP gene, c.4944_4945insC, was identified by mutational analysis.

Effects of curcumin on behavior and p-ERK, p-CREB, c-fos expression in dorsal root ganglion in chronic constrictive injury rats / 中国应用生理学杂志

<p><b>AIM</b>To investigate the effects of curcumin on the behavior of chronic constrictive injury (CCI) rats and the p-ERK, p-CREB, c-fos expression in dorsal root ganglion.</p><p><b>METHODS</b>108 male SD rats were randomly divided into 6 groups: (1) Control group (treated with CCI); (2) Sham operation group; (3) Solvent contrast group; (4) Curcumin treated group(Cur 30, Cur 100, Cur 300), treated with CCI, intraperitoneal injected with curcumin 30 mg x kg(-1) x d(-1), 100 mg x kg(-1) x d(-1), 300 mg x kg(-1) x d(-1) for 14 days after operation respectively. Thermal withdrawal latency (TWL) and mechanical withdrawal threshold (MWT) of rats were determined, respectively. Rats were killed on the 3th, 7h, 14th day after operation. The expression of p-ERK, p-CREB, c-fos in dorsal root ganglion were assessed by immunohistochemical analysis.</p><p><b>RESULTS</b>In Con group, the MWT and TWL declined gradually after operation. On the 3rd day, the rats represented the severest mechanical and thermal hyperalgesia(MWT was 15.3 +/- 3.0 g, TWL was 4.6 +/- 1.0 s). The expression of p-ERK, p-CREB, c-fos neurons were markedly increased in dorsal root ganglion. In Cur group, the MWT and TWL were also declined gradually, which were higher than Con group. On the 3rd day, the rats represented the severest mechanical and thermal hyperalgesia (MWT was 22.6 +/- 4.0 g, TWL was (5.6 +/- 1.1l)s in Cur 100 group), the expression of p-ERK, p-CREB, c-fos in dorsal root ganglion were lower than control group at each timepoint in each group.</p><p><b>CONCLUSION</b>Curcumin could attenuate the activation of p-ERK, p-CREB, c-fos in dorsal root ganglion to ameliorate the CCI-induced neuropathic pain.</p>

VP16CREB-induced differentiation of neuroblastoma.

OBJECTIVE: Drug-induced differentiation is commonly used as a therapeutic modality for the treatment of neuroblastoma tumors. Increased level of cyclic adenosine 3', 5'-monophosphate (cAMP) mediates terminal differentiation in some neuroblastoma cell lines through activation of several signaling networks, including cAMP response element binding protein (CREB). Objective was to test whether cAMP-induced differentiation in a murine neuroblastoma cell line (NBP2) is partly mediated by CREB. METHODS: Fluorescent microscopy was used to document neuron-like morphological changes imparted by a constitutively active CREB (VP16CREB). Real time PCR (RT-PCR) was performed to verify changes in the expression of cAMP/CREB responsive genes. RESULTS: It was found that transient expression of VP16CREB into NBP2 cells resulted in morphological changes that were characteristics of terminally differentiated neurons. Furthermore, increased expression of cAMP responsive genes was compromised in cells resisting VP16CREB-mediated differentiation. CONCLUSION: A constitutively active CREB induces terminal differentiation in a subset of NBP2 cell population. Altered expression of cAMP responsive genes may account for differentiation resistant phenotype in NBP2 cells.

Changes in learning and memory functions in rats with status epilepticus and generalized nonconvulsive status epilepticus / 南方医科大学学报

<p><b>OBJECTIVE</b>To observe the changes in the learning and memory functions and the hippocampal expression of phosphorylated cAMP response element-binding protein (pCREB) in rats with status epilepticus and generalized nonconvulsive status epilepticus.</p><p><b>METHODS</b>Status epilepticus (SE) and generalized nonconvulsive status epilepticus (GNCSE) was induced by pentylenetetrazol kindling in SD rats, and the learning and memory function changes of the kindled rats were assessed by means of Morris water-maze test and Y-maze test with alternative electric stimulation. Immunocytochemistry was used for analysis pCREB protein expression in the hippocampus of the rats.</p><p><b>RESULTS</b>In Morris water-maze test, the rats with SE showed prolonged mean escape latency (P<0.05), shortened swimming time in the platform quadrant (P<0.05), and reduced number of times of platform crossing (P<0.05) in the short term after kindling. But these changes were reversed and became normal a month after the kindling (P>0.05). In the Y-maze test with alternative electric stimulation, the total error (TE) of SE rats increased significantly in the short term after epilepsy (P<0.05), but recovered the normal level a month after kindling (P>0.05). The GNCSE rats showed prolonged mean escape latency at only certain time periods (P<0.05) in the short term, but with swimming time in the platform quadrant and number of platform crossings similar to the control group (P>0.05). The short-term TE of GNCSE rats increased significantly (P<0.05), but in the long term, TE was similar to that in the control group (P>0.05). The expression of pCREB decreased significantly in SE group in comparison with the control group in the short term.</p><p><b>CONCLUSION</b>Epileptic seizures can lead to learning and memory function impairment in rats, and SE seems to cause greater impact than GNCSE on the learning and memory functions. pCREB might be involved in the pathophysiology of learning and memory deficit in epileptic rats.</p>

Immunohistochemical Expression of p53 Protein and CREB-binding Protein in Gastric Adenocarcinomas

PURPOSE: The wild-type p53 protein participates in suppressing cell transformations while its mutant forms has tumorigenic potential. Alterations in the structure of the p53 protein are one of the most common changes associated with human cancers. CREB-binding protein (CBP) and its homologue, p300, are transcriptional co-activators of various sequence-specific DNA-binding transcription factors and are involved in a wide range of cellular activities, such as DNA repair, cell growth, differentiation, and apoptosis. Several studies suggested that an association between p53 and p300 might account for the p53-responsible negative regulation. This study examined the relationship between p53 and CBP expression in terms of the clinicopathological factors and significance. METHODS: The level of p53 protein and CBP expression was measured in 150 gastric adenocarcinoma patients, who had undergone a gastrectomy, and the relationship between p53 and CBP was examined. Immunohistochemical stain was performed on formalin-fixed paraffin-embedded sections using monoclonal anti-p53 and anti-CBP antibody. RESULTS: 1. p53 protein was expressed in 46.3% (31/67) of early gastric cancers (EGC), 69.9% (58/83) of advanced gastric cancers (AGC)(P0.05), 47.8% (32/67) of EGC, 69.8% (58/83) of AGC (P0.05). 3. p53 protein and CBP expression was coincidentally observed in 66.7% of gastric adenocarcinomas, and there was a significant correlation between the expression of both (P<0.05). CONCLUSION: That the expression of the p53 protein and CBP indirectly indicate the malignant potential of a cell, and may play an indirect role in the CBP and p53-mediated tumorigenic potential.

Screening of aplastic anaemia-related genes in bone marrow CD4+ T cells by suppressive subtractive hybridization / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>CD4(+) T cells play a crucial role in the pathogenesis of aplastic anaemia. However, the mechanisms of over-proliferation, activation, infiltration of bone marrow and damage to haematopoietic cells of CD4(+) T cells in aplastic anaemia are unclear. Therefore, we screened differentially expressed genes of bone marrow CD4(+) T cells of aplastic anaemia patients and normal donors by suppressive subtractive hybridization to investigate the pathogenesis of aplastic anaemia.</p><p><b>METHODS</b>The bone marrow mononuclear cells of a first visit aplastic anaemia patient and a healthy donor of the same age and sex were isolated using lymphocyte separating medium by density gradient centrifugation. With the patients as "tester" and donor as "driver", their CD4(+) T cells were separated with magnetic bead sorting and a cDNA library established by suppressive subtractive hybridization. Then 15 of the resulting subtracted cDNA clones were randomly selected for DNA sequencing and homological analysis. With semiquantitative RT-PCR, bone marrow samples from 20 patients with aplastic anaemia and 20 healthy donors assessed the expression levels of differentially expressed genes from SSH library.</p><p><b>RESULTS</b>PCR detected 89 clones in the library containing an inserted fragment of 100 bp to 700 bp. Among 15 sequenced clones, 12 were known genes including 3 repeated genes. Compared with normal donors, there were 9/12 genes over-expressed in bone marrow CD4(+) T cells of patients with aplastic anaemia. The effects of these genes included protein synthesis, biology oxidation, signal transduction, proliferative regulation and cell migration. Not all these genes had been reported in the mechanisms of haematopoietic damage mediated by CD4(+) T cells in aplastic anaemia.</p><p><b>CONCLUSIONS</b>Screening and cloning genes, which regulate functions of CD4(+) T cells, are helpful in elucidating the mechanisms of over proliferation, activation, infiltrating bone marrow and damaging haematopoietic cells of CD4(+) T cells in aplastic anaemia.</p>

The roles of c-Jun and CBP in the inhibitory effect of quercetin on prostate cancer cells / 药学学报

<p><b>AIM</b>To further uncover the possible mechanism of quercetin-mediated inhibitory effect on prostate cancer cells.</p><p><b>METHODS</b>The cell extracts treated with quercetin or without treatment were used for checking protein expression levels of c-Jun and cAMP response element binding protein (CREB)-binding protein (CBP) by Western blotting assay. Regulatory effects of c-Jun and CBP on the function of androgen receptor (AR) were examined by cotransfection experiment. Finally, a physical interaction of c-Jun and the AR was investigated by coimmunoprecipitation.</p><p><b>RESULTS</b>Quercetin dramatically induced the protein expression of c-Jun which in turn inhibited the AR function. Meanwhile, quercetin had no detectable effect on CBP expression, and the results of transient transfection demonstrated that the ectopic CBP stimulated the transcriptional activity of AR, whereas CBP-mediated stimulation could be attenuated by quercetin. Furthermore, physical interaction of c-Jun and the AR was confirmed by coimmunoprecipitation result.</p><p><b>CONCLUSION</b>Overexpression of c-Jun induced by quercetin had inhibitory effect on the function of AR protein, and increased CBP expression did not reverse the inhibition by quercetin. Together, quercetin-mediated inhibition on the AR function might be not by competition with limited amount of CBP in the cell, but through a direct association of c-Jun and the AR.</p>

Pharmacological evaluation of baicalin and jasminoidin and their combination on focal cerebral ischemia-reperfusion injury / 中国中药杂志

<p><b>OBJECTIVE</b>To elucidate the therapeutic effect and the influence on PI3K-Akt-PKB-BAD-CREB-PCREB pathway in focal cerebral ischemia rat responses before and after treatment with baicalin and jasminoidin given alone or in combination.</p><p><b>METHOD</b>Rat model of ischemia reperfusion was established with thread. Generally accepted methods were used, including TTC staining, behavior test, as well as micro and ultra microscopy which can dynamically and accurately monitor pathological and physiological changes after cerebral ischemia on earlier period, to evaluate the brain injury induced by ischemia and the attenuations by the drugs. The difference of PI3K-Akt-PKB-BAD-CREB-PCREB expression was detected by western-blot technology.</p><p><b>RESULT AND CONCLUSION</b>The combination of baicalin and jasminoidin composition can be potential neuroprotective agent. TTC staining technology combined with behavior grade and ultrmicro-structure observation on brain tissue is effective method to evaluate protective agent, which is related to signal transduction PI3K-Akt-PKB-BAD-CREB-PCREB pathway. The results provide benofical basis for revealing the complex of therapeutic mechanism of traditional Chinese medicine Qingkai Ling (QKL).</p>

Immunohistochemical Expression of p53 Protein and CREB-binding Protein in Polyps and Adenocarcinomas of Colon

Purpose: Alterations in the structure of the p53 protein are one of the most common changes associated with human cancers. The CREB-binding protein(CBP) is a transcriptional co-activators of various sequence-specific DNA-binding transcription factors and is involved in a wide variety of cellular activities, such as DNA repair, cell growth, differentiation, and apoptosis. This article examined the expression levels of the p53 protein and CBP as well as their diagnostic value in a biopsy sample. METHODS: Immunohistochemical analysis were performed in 60 hyperplastic polyps, 180 adenomatous polyps, and 120 adenocarcinomas which had sampled from colono-fibroscopic exam from January 2000 to August 2003. RESULTS: 1. p53 protein expression was observed in 15% (9/60) of hyperplastic polyps, in 68.9% (124/180) of adenomatous polyps, and in 80% (96/120) of adenocarcinomas (P<0.01). 2. p53 protein expression according to the cellular atypia in the adenomatous polyp was observed in 45% (27/ 60) of mild dysplasia, 78.3% (47/60) of moderate dysplasia, and 83.4% (50/60) of severe dysplasia. There was an increasing tendency in high grade dysplasia, which is statistically significant (P<0.05). 3. p53 protein expression according to the level of differentiation was observed in 90% (54/60) of well differentiated adenocarcinomas, 78% (39/50) of moderately differentiated adenocarcinomas, and 30% (3/ 10) of poorly differentiated adenocarcinomas (P<0.01). 4. CBP expression was observed in 30% (18/60) of hyperplastic polyps, 70.6% (127/180), of adenomatous polyps, and 85% (102/120) of adenocarcinomas (P<0.01). 5. CBP expression according to cellular atypia in adenomatous polyp was observed in 48.3% (29/60) of mild dysplasia, 76.6% (46/60) of moderate dysplasia, and 86.7% (52/60) of severe dysplasia (P<0.05). 6. CBP expression according to cellular differentiation was observed in 90% (36/60) of well differentiated adenocarcinomas, 86% (43/50) of moderately differentiated adenocarcinomas, and 50% (5/10) of poorly differentiated adenocarcinomas (P<0.05). Conclusion: The p53 protein and CBP expression can indicate the malignant potentiality of the colon cell indirectly.