Regulation by cAMP and vasoactive intestinal peptide of phosphorylation of specific proteins in striatal cells in culture.
We have studied three low molecular weight phosphoproteins, ARPP-16, ARPP-19, and ARPP-21 (cAMP-regulated phosphoproteins of Mr 16,000, 19,000, and 21,000, respectively) in reaggregate cultures from various regions of fetal mouse brain. ARPP-16 and ARPP-21 were detected only in striatal and cortical cultures. In contrast, ARP-19, which is structurally related to ARPP-16, was also present in reaggregate cultures prepared from thalamus and ventral and dorsal mesencephalon, as well as in monolayer cultures of astroglial cells. In striatal aggregates cultured over a 3-week period, the relative levels of ARPP-16, ARPP-21, and synapsin I/protein IIIa (synaptic vesicle-associated phosphoproteins closely related to each other and treated as a single entity in the present study) increased with time, whereas the level of ARPP-19 decreased. Incubation of striatal aggregates with 8-Br-cAMP, forskolin, or vasoactive intestinal peptide increased the phosphorylation of all these proteins. We conclude that the state of phosphorylation of two proteins enriched in specific neurons (ARPP-16 and ARPP-21) and two more widely distributed proteins (ARPP-19 and synapsin I/protein IIIa) is regulated by cAMP and vasoactive intestinal peptide in striatal cells in culture. These phosphoproteins may therefore play a role in mediating some of the actions of vasoactive intestinal peptide in the caudate-putamen.
Girault
J A
JA
Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, NY 10021.
Shalaby
I A
IA
Rosen
N L
NL
Greengard
P
P
D000818:Animals; D001345:Autoradiography; D001921:Brain / Q000378:metabolism*; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000378:metabolism; D005576:Colforsin / Q000494:pharmacology; D003342:Corpus Striatum / Q000378:metabolism*; D000242:Cyclic AMP / Q000502:physiology*; D008636:Mesencephalon / Q000378:metabolism; D051379:Mice; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation; D013788:Thalamus / Q000378:metabolism; D014660:Vasoactive Intestinal Peptide / Q000502:physiology*
D010750:Phosphoproteins; D005576:Colforsin; D014660:Vasoactive Intestinal Peptide; D000242:Cyclic AMP