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Kosmos
Astronomia Astrofizyka
Inne

Kultura
Sztuka dawna i współczesna, muzea i kolekcje

Metoda
Metodologia nauk, Matematyka, Filozofia, Miary i wagi, Pomiary

Materia
Substancje, reakcje, energia
Fizyka, chemia i inżynieria materiałowa

Człowiek
Antropologia kulturowa Socjologia Psychologia Zdrowie i medycyna

Wizje
Przewidywania Kosmologia Religie Ideologia Polityka

Ziemia
Geologia, geofizyka, geochemia, środowisko przyrodnicze

Życie
Biologia, biologia molekularna i genetyka

Cyberprzestrzeń
Technologia cyberprzestrzeni, cyberkultura, media i komunikacja

Działalność
Wiadomości | Gospodarka, biznes, zarządzanie, ekonomia

Technologie
Budownictwo, energetyka, transport, wytwarzanie, technologie informacyjne

MODULATION OF THE GABAA RECEPTOR BY SRIF IN RAT THALAMUS

Somatostatin has been reported to modulate GABAA receptor complex in many brain structures. This study was conducted to investigate somatostatin modulation of the GABAA receptor binding in several rat diencephalic structures, focusing primarily on the thalamus, as this structure plays important roles. Animals were assigned to control conditions. Changes in specific binding of GABAA receptor as labelled with [35S]t-Butylbicyclophosphorothionate (TBPS) were assessed by in vitro quantitative autoradiography with the aid of a computer assisted image analysis system. Our results reveal the presence of higher densities in several thalamic structures located principally in the part of thalamus. We demonstrate for the first time the presence of a modulatory effect of somatostatin on the GABAA receptor complex in this brain region in rats. Indeed, the peptide affected in a concentration-dependent manner; the binding of [35S]-Tertiary Butylbicyclophosphorothionate (TBPS) to the convulsant site of the GABAA receptor complex in thalamic structures with an affinity in the micromolar range (10-3 to 3.10-6M). The inhibitory effect of somatostatin is observed in all thalamic structures analyzed. The absence of a specific region effect of somatostatin on the binding of [35S]-TBPS, suggests the presence of a homogenous subunit GABAA receptor composition. Furthermore, GABA and muscimol, a GABAA receptor agonist, enhanced the affinity of somatostatin effect on [35S]-TBPS. This suggests that somatostatin allosterically modifies [35S]-TBPS binding through a mechanism similar to that of GABA.

American Journal of Neuroscience 2012/09/14 - 10:23 Czytaj