Abstract:
:Complementary RNA probes derived from complementary DNA specifically subcloned from monkey tissue were used to localize, by in situ hybridization histochemistry, the relatively rare alpha3, beta3 and gamma1 subunit transcripts of the GABA(A) receptor in visual cortex and lateral geniculate nucleus of normal monkeys and in monkeys that had been deprived of vision in one eye. Overall, levels of alpha3, beta3 and gamma1 subunit transcripts were very low. In the primary visual cortex (area 17) they were concentrated in layers II and VI and in a stratum of white matter subjacent to layer VI. The localization and density of the three messenger RNAs closely resembled those of other rare (alpha2, alpha5 and beta1) transcripts but their distribution also overlapped that of the predominant alpha1, beta2 and gamma2 subunit transcripts. In area 18, alpha3 and beta3 transcript distribution resembled that in area 17, with the addition of a third band of hybridization in layer IV for beta3. Gamma1 subunit transcript localization in area 18 differed significantly from that in area 17, with increased expression restricted to layer IV. In the dorsal lateral geniculate nucleus, beta3 and gamma1 transcripts were expressed at low levels across all layers while alpha3 transcripts were restricted to the magnocellular layers. Following 15 and 18 day periods of monocular deprivation, induced by intravitreal injections of tetrodotoxin, levels of alpha3 receptor subunit transcripts showed modest reductions in layer VI of area 17 and in deprived geniculate laminae of adult animals. Reductions in alpha3 transcript levels were much more pronounced in layer IVCbeta of a five-month-old monkey deprived for the same time. Levels of beta3 and gamma1 transcripts were unaffected by monocular deprivation in cortex and geniculate at any age. Taken together with studies of other GABA(A) receptor transcripts, these results demonstrate the heterogeneity of GABA(A) receptor messenger RNA expression in the monkey geniculo-striate pathway and the varied response to reduced neuronal activity.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Huntsman MM,Jones EGdoi
10.1016/s0306-4522(98)00140-7subject
Has Abstractpub_date
1998-11-01 00:00:00pages
385-400issue
2eissn
0306-4522issn
1873-7544pii
S0306452298001407journal_volume
87pub_type
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