title: Plasma membrane density of GABA(B)-R1a, GABA(B)-R1b, GABA-R2 and trimeric G-proteins in the course of postnatal development of rat brain cortex.
abstract: With the aim to understand the onset of expression and developmental profile of plasma membrane (PM) content /density of crucial components of GABA(B)-R signaling cascade, GABA(B)-R1a, GABA(B)-R1b, GABA(B)-R2, G(i)1/G(i)2alpha, G(i)3alpha, G(o)alpha, G(z)alpha and Gbeta subunit proteins were determined by quantitative immunoblotting and compared in PM isolated from brain cortex of rats of different ages: between postnatal-day-1 (PD1) and 90 (PD90). PM density of GABA(B)-R1a, GABA(B)-R2, G(i)1/G(i)2alpha, G(i)3alpha, G(o)alpha, G(z)alpha and Gbeta was high already at birth and further development was reflected in parallel decrease of both GABA(B)-R1a and GABA(B)-R2 subunits. The major decrease of GABA(B)-R1a and GABA(B)-R2 occurred between the birth and PD15: to 55 % (R1a, **) and 51 % (R2, **), respectively. Contrarily, PM level of the cognate G-proteins G(i)1/G(i)2alpha, G(i)3alpha, G(o)alpha, G(z)alpha and Gbeta was unchanged in the course of the whole postnatal period of brain cortex development. Maturation of GABA(B)-R cascade was substantially different from ontogenetic profile of prototypical plasma membrane marker, Na, K-ATPase, which was low at birth and further development was reflected in continuous increase of PM density of this enzyme. Major change occurred between the birth and PD25. In adult rats, membrane content of Na, K-ATPase was 3-times higher than around the birth.
authors.affiliation: Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic. svobodap@biomed.cas.cz.
authors.forename: K
authors.initials: K
authors.lastname: Dlouhá
authors.forename: D
authors.initials: D
authors.lastname: Kagan
authors.forename: L
authors.initials: L
authors.lastname: Roubalová
authors.forename: H
authors.initials: H
authors.lastname: Ujčíková
authors.forename: P
authors.initials: P
authors.lastname: Svoboda
mesh_terms: D000367:Age Factors; D000818:Animals; D002462:Cell Membrane / Q000378:metabolism*; D002540:Cerebral Cortex / Q000254:growth & development / Q000378:metabolism*; D051960:GTP-Binding Protein alpha Subunit, Gi2 / Q000378:metabolism; D044385:GTP-Binding Protein alpha Subunits / Q000378:metabolism; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism; D044387:GTP-Binding Protein beta Subunits / Q000378:metabolism; D020962:Heterotrimeric GTP-Binding Proteins / Q000378:metabolism*; D051381:Rats; D018080:Receptors, GABA-B / Q000378:metabolism*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D044385:GTP-Binding Protein alpha Subunits; D044387:GTP-Binding Protein beta Subunits; C116566:Gabbr2 protein, rat; C522851:Gnai1 protein, rat; C490963:Gnaz protein, rat; D018080:Receptors, GABA-B; D051960:GTP-Binding Protein alpha Subunit, Gi2; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; C498017:Gnai2 protein, rat; C498820:Gnai3 protein, rat; D020962:Heterotrimeric GTP-Binding Proteins; D000254:Sodium-Potassium-Exchanging ATPase