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Query: UNIPROT:P04626 (erbB-2)
 5,251 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Recent experimental data have clearly demonstrated that fibroblast growth factor (FGF)8 plays a key role in the development of human prostate and breast cancers. However, little is known about the FGF8 expression profile in human breast cancer specimens. In this study, we analyzed FGF8 expression in 78 surgically resected specimens of breast cancer using an immunohistochemical method. In total, FGF8 expression was found in 40 (51.3%) of the breast carcinomas. FGF8 expression was not associated with any of the general clinicopathological parameters, including age, tumor size, histological grade, and histological type. In addition, there was no correlation between FGF8 expression and either c-erbB-2 overexpression or the status of the axillary lymph-node metastasis, both of which have been established as important prognostic factors in breast carcinomas. While no significant association was found between FGF8 expression and estrogen- or progesterone-receptor status, it is of interest that FGF8 expression was significantly associated with androgen-receptor status and the expression of prostate-specific antigen (PSA), one of the androgen-regulated proteins, in human breast carcinomas. These associations support the reported in vitro data demonstrating the regulation of FGF8 by androgens, and also suggest that PSA may be a useful marker for patients with FGF8-expressing breast carcinomas.
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PMID:Fibroblast growth factor 8 expression in breast carcinoma: associations with androgen receptor and prostate-specific antigen expressions. 1240 63

Advanced prostate cancer invariably recurs despite androgen deprivation therapy. The androgen receptor (AR) likely plays a key role in this progression and in the continued survival and proliferation of prostate cancer cells in the low androgen environment. Cross-talk with growth factor receptors, such as epidermal growth factor receptor (EGFR) family, has been postulated as a potential mechanism to activate AR in recurrent prostate cancer. We have investigated the role of HER-2/neu (ErbB-2) tyrosine kinase in AR function by characterizing the effect of inhibiting endogenous HER-2 activity in LNCaP cells. We used two independent methods, expression of intracellular single-chain antibody against HER-2 and treatment with a novel dual EGFR/HER-2 kinase inhibitor GW572016 (lapatinib). Expression of intracellular HER-2 antibody scFv-5R and treatment with GW572016 inhibited HER-2 signaling. This HER-2 inhibition led to impairment of AR-mediated functions, such as androgen-stimulated growth and the induction of endogenous prostate-specific antigen (PSA) mRNA and protein. Androgen-stimulated recruitment of AR and histone acetylation at the androgen responsive enhancer of the PSA gene, detected by chromatin immunoprecipitation analysis, were impaired by HER-2 inhibition. GW572016 was more potent in its ability to inhibit PSA expression and AR recruitment and histone acetylation than the EGFR-selective kinase inhibitor ZD1839 (gefitinib), consistent with the HER-2 kinase playing the major role in AR regulation. These results show that HER-2 signaling is required for optimal transcriptional activity of AR in prostate cancer cells and suggest that HER-2 inhibition may provide a novel strategy to disrupt AR function in prostate cancer.
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PMID:Inhibition of HER-2/neu kinase impairs androgen receptor recruitment to the androgen responsive enhancer. 1583 75

This article introduces the use of information theoretic concepts such as entropy, S, for the evaluation of laboratory tests results, and it offers a new measure of information, 1 - S, which tells us just how far toward certainty a laboratory test result can predict a binary outcome. The derived method is applied to the serum markers troponin I and prostate-specific antigen and to histologic grading of HER-2/neu staining, to cytologic diagnosis of cervical specimens, and to the measurement of tumor thickness in malignant melanoma. Not only do the graphic results provide insight for these tests, they also validate prior conclusions. Thus, this information theoretic approach shows promise for evaluating and understanding laboratory test results.
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PMID:Entropy and information content of laboratory test results. 1714 29

The aim of this study is to assess tissue and serum prostate-specific antigen (PSA) in breast lesions; to compare tissue PSA with serum PSA; to compare tissue PSA in benign and malignant lesions and to compare PSA with known prognostic factors in breast carcinoma. Tissue PSA immunoreactivity in twenty women with breast carcinoma was compared with PSA in twenty-three women with benign breast lesions. Tissue PSA was also compared with known prognostic indicators such as tumour size, axillary nodal status, histological type, histological grade, oestrogen receptor status, progesterone receptor status and c-erbB-2 oncoprotein over-expression. Serum free PSAlevels from these women were measured pre- and post-operatively and an attempt was made to correlate serum PSA with tissue PSA expression. 40% and 43% of malignant and benign breast lesions respectively showed tissue PSA immunoreactivity. No significant difference was observed in the tissue PSA expression between these two groups as also between tissue PSA and known prognostic indicators. As serum PSA levels were below the detection limit (< 0.004 ng/ml) in all except two benign cases, no statistical evaluation was done for the latter. Tissue PSA expression did not correlate with other prognostic markers and detectable serum PSA levels were present in too few cases for statistical analysis. Although no definitive conclusion is possible in this preliminary study regarding the role of PSA in breast disease, it stimulates interest in further research in this direction.
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PMID:Prostate-specific antigen in breast disease. 1910 11

MicroRNAs (miRNAs) are short, non-coding RNAs that regulate gene expression and are aberrantly expressed in human cancer. The ERBB-2 tyrosine kinase receptor is frequently overexpressed in prostate cancer and is associated with disease progression and poor survival. We have identified two specific miR-331-3p target sites within the ERBB-2 mRNA 3'-untranslated region and show that miR-331-3p expression is decreased in prostate cancer tissue relative to normal adjacent prostate tissue. Transfection of multiple prostate cancer cell lines with miR-331-3p reduced ERBB-2 mRNA and protein expression and blocked downstream phosphatidylinositol 3-kinase/AKT signaling. Furthermore, miR-331-3p transfection blocked the androgen receptor signaling pathway in prostate cancer cells, reducing activity of an androgen-stimulated prostate-specific antigen promoter and blocking prostate-specific antigen expression. Our findings provide insight into the regulation of ERBB-2 expression in cancer and suggest that miR-331-3p has the capacity to regulate signaling pathways critical to the development and progression of prostate cancer cells.
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PMID:miR-331-3p regulates ERBB-2 expression and androgen receptor signaling in prostate cancer. 1958 56

The intracellular expression of the gene products of tumor-associated markers p53, proliferative cell nuclear antigen (PCNA), HER-2/neu, c-myc, H-ras, and epidermal growth factor receptor (EGFr) in 86 cases of localized prostatic adenocarcinoma was investigated immunohistochemically in formalin-fixed paraffin-embedded tissue sections after pretreatment with a novel antigen retrieval buffer. A scoring system was devised to assess strength, pattern, and combined strength/pattern of immunostainings in the nucleus and cytoplasm for each immunomarker. The results were evaluated to determine whether overexpression of the gene products in the nucleus and cytoplasm was predictive of local and/or distant tumor recurrence and whether their expression was associated with known clinical prognostic factors. There was no significant relation between p53, PCNA, HER-2/neu, c-myc, and H-ras protein expression with risk of recurrence. EGFr expression showed a trend of increasing risk of tumor recurrence with higher composite score. Analysis of the association with other known prognostic factors in prostatic adenocarcinoma showed that PCNA was significantly correlated with tumor stage while H-ras and HER-2/neu were marginally correlated with prostatic acid phosphatase (PAP) and prostate-specific antigen (PSA) pretreatment serum levels, respectively. Together our findings suggest that overexpression of these intracellular oncoproteins in the tumor cells may not play an important role in determining whether prostatic tumors are likely to recur in localized prostatic adenocarcinoma.
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PMID:The prognostic significance of tumor-associated markers p53, HER-2/neu, c-myc, v-H-ras, PCNA and EGFr of local and distant recurrence in localized human prostatic adenocarcinoma. 2122 8

Dual-specificity phosphatases (DUSPs) regulate the activity of various downstream kinases through serine or threonine or tyrosine dephosphorylation. Loss of function and aberrant expression of DUSPs has been implicated in cancer progression and poor survival, yet the function of DUSP22 in prostate cancer (PCa) cells is not clear. Gene Expression Omnibus and cBioPortal microarray database analyses showed that DUSP22 expression was lower in PCa tissues than normal prostate tissues, and altered DUSP22 expression was associated with shorter progression-free and disease-free survival of patients with PCa. Exogenous DUSP22 expression in LNCaP, PC3, and C4-2B PCa cells inhibited cellular proliferation and colony formation, supporting a growth inhibitory role for DUSP22 in PCa cells. DUSP22 expression significantly attenuated epidermal growth factor (EGF) receptor (EGFR) and its downstream ERK1/2 signaling by dephosphorylation. However, DUSP22 failed to suppress the growth of CWR22Rv1 and DU145 cells with elevated phosphorylated (p-)ERK1/2 levels. A serine-to-alanine mutation at position 58, a potential ERK1/2-targeted phosphorylation site in DUSP22, was sufficient to suppress growth of CWR22Rv1 cells with elevated p-ERK1/2 levels, suggesting a mutually antagonistic relationship between DUSP22 and ERK1/2 dependent on phosphorylation status. We showed that DUSP22 can suppress prostate-specific antigen gene expression through phosphatase-dependent pathways, suggesting that DUSP22 is an important regulator of the androgen receptor (AR) in PCa cells. Mechanistically, DUSP22 can interact with AR as a regulatory partner and interfere with EGF-induced AR phosphorylation at Tyr534, suggesting that DUSP22 serves as a crucial suppressor of both EGFR and AR-dependent signaling in PCa cells via dephosphorylation. Our findings indicate that loss of function of DUSP22 in PCa cells leads to aberrant activation of both EGFR-ERKs and AR signaling and ultimately progression of PCa, supporting the potential for novel therapeutic design of harnessing DUSP22 in the treatment of PCa.-Lin, H.-P., Ho, H.-M., Chang, C.-W., Yeh, S.-D., Su, Y.-W., Tan, T.-H., Lin, W.-J. DUSP22 suppresses prostate cancer proliferation by targeting the EGFR-AR axis.
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PMID:DUSP22 suppresses prostate cancer proliferation by targeting the EGFR-AR axis. 3169 67


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