Title: Evidence for Rap1 in vascular smooth muscle cells. Regulation of their expression by platelet-derived growth factor BB
Authors: Quarck, Rozenn ×
Bryckaert, M
Magnier, C
Corvazier, E
Bredoux, R
de Gunzburg, J
Fontenay, M
Tobelem, G
Enouf, J #
Issue Date: 16-May-1994
Series Title: FEBS Letters vol:342 issue:2 pages:159-64
Abstract: The effect of platelet-derived growth factor (PDGF) on Rap1 expression was investigated in rat vascular smooth muscle cells (SMC). First, evidence for Rap1 proteins was shown by their: (i) detection in membranes using a specific anti-Rap1 antibody, (ii) typical shift in electrophoretic mobility as a consequence of reduction, and (iii) cAMP-induced phosphorylation and immunoprecipitation. Then, the mitogenic activity of 10 ng/ml PDGF AA and BB for 48 h, resulting in a 2- and 5-fold increase in [3H]thymidine incorporation, was correlated with that of total Rap1 protein expression which was found to be 99% +/- 36% and 260% +/- 70%, respectively. Further time-course studies established that this up-regulation of Rap1 proteins was only observed after 48 h of PDGF BB treatment. Lastly, comparative RT-PCR of both rap1a and rap1b mRNAs showed that PDGF BB also up-regulated the rap1a mRNA species, which was 1.5-fold increased in contrast with the rap1b mRNA species. It is concluded that the PDGF BB-induced SMC proliferation is associated with an up-regulation of Rap1a protein.
ISSN: 0014-5793
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Pneumology
× corresponding author
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science