Effects of serotonin and carbachol on glial and neuronal rubidium uptake in leech CNS.
Brain Res
; 597(2): 181-8, 1992 Dec 04.
Article
em En
| MEDLINE
| ID: mdl-1472992
ABSTRACT
Effects of serotonin (5-HT) and carbachol on Rb uptake (used as a K marker) in leech neuron and glia were studied by electron probe microanalysis (EPMA). Hirudo medicinalis ganglia were perfused 60 s in 4 mM Rb substituted normal leech Ringer's with and without 5-HT (dosage range 5-500 microM) or carbachol (range 10-1000 microM), quench frozen cryosectioned, and subjected to EPMA to determine elemental mass fractions and cell water content. Both 5-HT and carbachol altered leech neuron and glial cell elemental distribution and water content. In glial cells, a dose-dependent increase in Rb uptake was observed following 5-HT (control 26 +/- 2 microM; 5 microM 47 +/- 4; 50 microM 62 +/- 4; 500 microM 82 +/- 11 mmol/kg dry wt. +/- S.E.M.) and carbachol (10 microM 35 +/- 3; 100 microM 52 +/- 3; 1000 microM 68 +/- 3 mmol/kg dry wt. +/- S.E.M.). In neurons, 5-HT and carbachol had small effects. 5-HT decreased glial and neuronal cell water content. Carbachol decreased neuronal (but not glial) water content by approximately the same amount (mean decrease 9%) regardless of dose. Both 5-HT and carbachol affected glial cell K-accumulating properties, providing evidence that certain neurotransmitters may modulate invertebrate glial cells' K clearance function.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Rubídio
/
Carbacol
/
Serotonina
/
Neuroglia
/
Sanguessugas
/
Neurônios
Limite:
Animals
Idioma:
En
Revista:
Brain Res
Ano de publicação:
1992
Tipo de documento:
Article