Independent and interrelated regulation of ornithine decarboxylase by calcium and cAMP in fetal rat osteoblasts.

Abstract:

:The present study was undertaken to determine in fetal rat osteoblasts whether and how the intracellular messengers calcium and cAMP are involved in stimulation of ornithine decarboxylase (ODC) activity. For that purpose we used different drugs affecting [Ca2+]i and cAMP concentration. A23187 stimulates ODC activity in a biphasic way, with maximal stimulation at 100 nM A23187. At that concentration no stimulation of cAMP production was observed. Basal and A23187-stimulated (100 nM) ODC activity were inhibited by EGTA and trifluoperazine. Forskolin stimulated dose-dependently both ODC activity and cAMP production. Besides these effects forskolin (1 and 10 microM) increased the [Ca2+]i via an increased calcium influx. Addition of La3+, verapamil or EGTA, but not of trifluoperazine, significantly inhibited the forskolin-stimulated (10 microM) ODC activity. When forskolin (100 nM and 1 microM) was added together with 1 microM A23187, a synergistic stimulation of ODC activity was observed. These results implicate that calcium is involved in basal ODC activity, and that ODC activity can be stimulated via (1) a cAMP-independent calcium pathway, and (2) a calcium-dependent, cAMP pathway. It is proposed that ODC activity can be stimulated via interaction between calcium and cAMP.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

van Leeuwen JP,Bos MP,Herrmann-Erlee MP

doi

10.1016/0143-4160(88)90022-x

subject

Has Abstract

pub_date

1988-08-01 00:00:00

pages

181-91

issue

4

eissn

0143-4160

issn

1532-1991

pii

0143-4160(88)90022-X

journal_volume

9

pub_type

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