Avtor/Urednik		Kržan, Mojca; Wu, W Vivian; Schwartz, Joan P
Naslov		Serotonin regulation of nerve growth factor synthesis in neonatal and adult astrocytes: comparison to the beta-adrenergic agonist isoproterenol
Tip		članek
Vir		J Neurosci Res
Vol. in št.		Letnik 64
Leto izdaje		2001
Obseg		str. 261-7
Jezik		eng
Abstrakt		Although serotonin regulates synthesis of the neurotrophic factor S-100B by astrocytes, its ability to affect nerve growth factor (NGF) synthesis has never been examined. We report here that there is a correlation between the effect of serotonin on cyclic adenosine monophosphate (cAMP) content and on NGF content in neonatal astrocytes but not in adult astrocytes. In neonatal striatal astrocytes, serotonin increases both cAMP and NGF, whereas, in neonatal cerebellar astrocytes, serotonin decreases both. The increase in neonatal cortical astrocyte cAMP appeared to be too small (45%) to increase NGF significantly. The B-adrenergic agonist isoproterenol increased cAMP and NGF in both cortical and striatal astrocytes derived from neonatal rats. In contrast, there was a dissociation between cAMP changes and NGF changes in strrocytes derived from adult rats. Both serotonin and isoproterenol increased cAMP in adult cortical astrocytes, without any effect on NGF content. However, adult striatal astrocytes responded to serotonin with an elevation of both cAMP and NGF, whereas isoproterenol could only enhance cAMP, without affecting NGF. Thus, in neonatal astrocytes, a change of sufficient magnitude in cAMP was correlated with a comparable change in NGF, in response to activation of either serotonergic or B-adrenergic receptors; in cerebellar astrocytes, the decrease in cAMP was accompained by a decrease in NGF. In contrast, adult astrocytes were not responsive: Although cAMP changes were large, NGF synthesis was increased only in striatal astrocytes and only in response to serotonin.
Deskriptorji		ASTROCYTES NERVE GROWTH FACTORS SEROTONIN ISOPROTERENOL CYCLIC AMP RATS CELLS, CULTURED CEREBELLUM CORPUS STRIATUM CEREBRAL CORTEX ENZYME-LINKED IMMUNOSORBENT ASSAY POLYMERASE CHAIN REACTION RATS AGE FACTORS