Chikuma T, Ishii Y, Kato T, Kurihara N, Hakeda Y, Kumegawa M. Effect of chlorpromazine on PZ-peptidase and several other peptidase activities in cloned osteoblastic cells (MC3T3-E1).
Biochem Pharmacol 1987;
36:4319-24. [PMID:
2825722 DOI:
10.1016/0006-2952(87)90678-2]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The effect of chlorpromazine (CPZ) on the degradation of collagen and non-collagenous peptides in clonal osteoblastic MC3T3-E1 cells was investigated by measuring the activities of PZ-peptidase, collagenase-like peptidase (CL-peptidase), dipeptidyl-aminopeptidase (DAP), leucine aminopeptidase (LAP) (EC 3.4.11.1), and post-proline cleaving enzyme (PPCE) (EC 3.4.21.26). CPZ increased PZ-peptidase and CL-peptidase activities in a dose-related fashion, but it had no effect on LAP and PPCE activities in the cells. CPZ (10 micrograms/ml) enhanced the specific activities of PZ-peptidase, CL-peptidase, and DAP for 72 hr after the start of CPZ stimulation; in particular, about a 3.3-fold increase of PZ-peptidase activity was observed at 12 hr of culture. Furthermore, other phenothiazine derivatives specifically enhanced the PZ-peptidase, CL-peptidase, and DAP activities as well as CPZ. Since PZ-peptidase, CL-peptidase, and DAP, involved in the degradation of collagen peptides, were induced significantly by CPZ (and/or other phenothiazine derivatives) in comparison with LAP and PPCE, involved in the degradation of non-collagenous peptides, these results show that CPZ specifically stimulated collagen catabolism by inducing the collagen-catabolizing enzymes. In addition, CPZ specifically inhibited collagen synthesis in clonal osteoblasts.
Collapse