Bcl-2 phosphorylation has pathological significance in human breast cancer.
The anti-apoptotic molecule, Bcl-2, is well known to play an important role in the chemoresistance of breast cancer. We have previously demonstrated that phosphorylation of Fas-associated death domain-containing protein (FADD) at 194 serine through c-jun NH2-terminal kinase (JNK) activation sensitizes breast cancer cells to chemotherapy through accelerating cell cycle arrest at G2/M, and that Bcl-2 phosphorylation downstream of JNK/FADD plays an important role in cell growth suppression by paclitaxel. In this study, the clinicopathological association of phosphorylated Bcl-2 (P-Bcl-2) with estrogen, progesterone, c-erbB-2 receptors, p53 expressions and phosphorylated FADD/JNK (P-FADD/JNK) was analyzed immunohistochemically using 107 human breast cancer specimens. Expression of P-Bcl-2 was found to significantly correlate with lymphatic invasion, lymph node metastasis, but not histological differentiation, tumor grade or vascular and fatty invasion. The positivity of P-Bcl-2 was also significantly correlated to that of P-FADD/JNK. Thus, P-Bcl-2 as well as the P-FADD/JNK parameter might be useful markers for cancer progression, independent of the hormone receptor status, in human breast cancers.
Matsuyoshi
Syuichi
S
Department of Pathology, Nara Medical University School of Medicine, Kashihara, Nara, Japan. smatsu@naramed-u.ac.jp
Shimada
Keiji
K
Nakamura
Mitsutoshi
M
Ishida
Eiwa
E
Konishi
Noboru
N
D014408:Biomarkers, Tumor / Q000378:metabolism; D001943:Breast Neoplasms / Q000378:metabolism*; D018270:Carcinoma, Ductal, Breast / Q000378:metabolism* / Q000556:secondary; D018275:Carcinoma, Lobular / Q000378:metabolism* / Q000556:secondary; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology; D008207:Lymphatic Metastasis; D008875:Middle Aged; D010766:Phosphorylation; D011379:Prognosis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism*
D014408:Biomarkers, Tumor; D019253:Proto-Oncogene Proteins c-bcl-2; D048031:JNK Mitogen-Activated Protein Kinases