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PC2/CPE-mediated pro-protein processing in tumor cells and its differentiated cells or tissues.

Abstract：

:Pro-protein convertase-2 (PC2) and carboxypeptidase-E (CPE) proteins are two major members of the pro-protein convertases that involve in the maturation of protein precursor. By using PC2 activity, immunocytochemistry (ICC) and Western blot method, PC2, CPE and preproNPY protein expression levels were compared among mature retina tissue, RGC-5 cells and its differentiated cells, or brain cortex tissue, NS20Y tumor cells and its differentiated cells, or mature breast tissue, breast tumor cell RM1 and breast adenocarcinoma tissue. The experimental results indicated that the differentiated cells or tissues had higher or highest PC2 activity. In the comparative experiments, more PC2 protein expression in the mature tissues and more CPE and preproNPY protein expression in the tumor cells or tumor tissue were observed, but no expression of preproNPY protein was observed in the mature tissues. Compared with NS20Y or RGC-5 undifferentiated cells, its differentiated cells showed less proPC2, more proCPE and more preproNPY protein expressions. The results demonstrated that the mature tissues showed stronger PC2/CPE-mediated pro-protein processing ability than the tumor cells or tissue. The results also showed that the artificial differentiation of RGC-5 or NS20Y cells was different from maturation of its corresponding normal tissue.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Tang SS,Zhang JH,Liu HX,Li HZ

doi

10.1016/j.mce.2009.01.020

subject

Has Abstract

pub_date

2009-05-06 00:00:00

pages

43-9

issue

1-2

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(09)00092-6

journal_volume

303

pub_type

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