Expression of RBBP4 and BCL-2 in gastric carcinoma and their clinicopathological significance / 临床与实验病理学杂志

Purpose To investigate the expression and significance of RBBP4 and BCL-2 in gastric carcinoma and to explore the relationship between their expression and clinicopathologic characteristics.Methods Immunohistochemistry was used to detect RBBP4 and BCL-2 proteins' expression in the 72 tumor tissues and para-cancer tissues.The association of RBBP4 expression with the clinicopathologic features and the expression correlation between RBBP4 and BCL-2 were analyzed.Real-time PCR was used to detect the expression of RBBP4 mRNA in the 20 tumor tissues and corresponding para-cancer tissues.Results Immunohistochemical results showed that 40 cases of cancer tissues exhibited RBBP4 positive expression,with a positive rate of 55.6％,and 36 cases showed BCL-2 positive expression (50％ positive rate),which were significantly higher than that in para-cancer mucosa (13.9％,16.7％).The over-expression of RBBP4 and BCL-2 was correlated with tumor differentiation,invasive depth and lymphatic metastasis in gastric carcinoma (P＜ 0.05).The expression of RBBP4 was positively correlated with BCL-2 (r =0.559,P ＜ 0.05).Real-time PCR results showed that the relative expression levels of RBBP4 mRNA in gastric carcinoma tissues and para-cancer tissues were 9.988 ± 1.948 and 1.458 ± 0.489 respectively,and the expression in gastric carcinoma was significantly up-regulated as compared with para-cancer tissues.Conclusions The expression of RBBP4 is up-regulated in gastric carcinoma,which may be involved in the development,invasion and metastasis of gastric carcinoma.RBBP4 might become a new diagnostic and prognostic marker for gastric carcinoma.

Role of retinoblastoma protein-associated protein 48 (RBBP4) in HIV-1 latency / 中华微生物学和免疫学杂志

Objective To investigate the role and mechanism of retinoblastoma protein-associated proteins 48 (RBBP4) in HIV-1 latency.Methods CEM-Bru cells latently infected with HIV-1 were stimulated with 25 ng/ml of tumor necrosis factor alpha (TNF-α) in combination with 10 ng/ml of interleukin-2 (IL-2).Chromatin immunoprecipitation (ChIP) was performed to detect the changes in RBBP4 and in histone deacetylases 1 and 2 (HDAC1/2) binding to long terminal repeat (LTR).Binding activities of HDAC1/2 and RNA polymerase Ⅱ (RNA Pol Ⅱ) to LTR and acetylated histone H3 at LTR region were detected by ChIP after partially interfering the expression of RBBP4 in CEM-Bru cells with electroporation.Initiating and elongated transcripts were measured by RT-PCR.Results The binding activities of RBBP4 and HDAC1/2 to LTR in HIV-1 latently infected cells were enhanced significantly as compared with those in TNF-α and IL-2 co-stimulated cells.Fewer RBBP4 and HDAC1/2 bound to LTR following the interference of RBBP4 expression, which was accompanied with enhanced histone acetylation and strengthened binding activity of RNA Pol Ⅱ to LTR.Moreover, more initiating transcripts were detected in HIV-1 latently infected cells after the RBBP4 expression was interfered by electroporation.Conclusion RBBP4 contributes to the maintenance of HIV-1 latency, in which HDAC1 and HDAC2 might be involved.

The value of retinoblastoma binding protein 4 in the diagnosis of prostate cancer / 中华泌尿外科杂志

Objective To explore the value of retinoblastoma binding protein 4 ( RBBP4 ) in diagnosing prostate cancer ( PCa).Methods From January 2015 to December 2015, the prostate tissue after prostatectomy were collected and the differentially expressed degree of RBBP4 protein was analyzed in PCa and adjacent tissues by 2D-DIGE technology.The RBBP4 score of prostate tissue chip which contains 3 normal prostate tissues, 7 cancer adjacent normal prostate tissues, 50 adenocarcinoma and 20 hyperplasia tissue was checked by immunohistochemistry( IHC).In 50 patients with PCa, 4 cases were less than 60 years old and 46 cases were more than 60 years.In those patients, the Gleason scores were less than 7 scores in 18 cases, and more than 7 scores in 30 cases.22 cases were confirmed less than Ⅱ stage, and 28 cases were confirmed more than Ⅲ stage.Finally, the RBBP4 IHC score and the clinic-pathological parameters such as age, Gleason score and clinical stage of PCa patients were analyzed together.Results We found that the protein of RBBP4 increased by 2.15 times in PCa tissues compared to adjacent tissues by using 2D-DIGE technology( P=0.008).The expression of RBBP4 was higher than that in benign tissues by IHC ( F=43.972,P=0.000).And the expression of RBBP4 was positive correlation with Gleason score( t=5.589, P=0.000) and clinical stage(t=5.620,P=0.000), but was negative correlation with age(t=1.125,P=0.266).Conclusions The detection of RBBP4 can help to separate PCa from benign tissues.The overexpression of RBBP4 might result in the rapid growth of malignant cells.It may have certain value in determine the clinical staging and pathological grading of PCa.