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- W2045507154 abstract "In nocturnal rodents, the c-fos gene is directly involved in the light mechanism of resetting of the suprachiasmatic nucleus (circadian clock). Light also induces c-fos expression in the retinal ganglion cell layer (GCL), but no attempt has been made to study the retinal responses to the phase-shifting effects of light. The expression of the Fos protein in each of the two populations of the GCL (displaced amacrine cells [DACs] and ganglion cells [GCs]) was analyzed in hamsters after light stimulation delivered early (circadian time [CT13]) and in the middle (CT18) of the subjective night. To evaluate as accurately as possible the number of GCs able to phase shift the locomotor activity rhythm (LAR), neonatal hamsters treated with monosodium glutamate (MSG) were also used, an in vivo model which displays retinal degeneration and LAR normally entrained by light. In nontreated hamsters, the number of Fos-immunoreactive (Fos-ir+) nuclei in the GCL was significantly higher at CT18 than at CT13. In MSG-treated hamsters, the number of Fos-ir+ nuclei was the same at both CTs and nonsignificantly different as those of nontreated hamsters at CT13. MSG treatment destroyed as many Fos-ir+ DACs as Fos-ir- DACs or Fos-ir+ GCs. Fos-ir+ GCs were less sensitive to neurotoxic than other GCs, as only 37% of them were destroyed by treatment versus 92% for Fos-ir- GCs. At CT18, a maximum of 3,500 GCs expressed Fos protein in nontreated hamsters versus only 2,200 in MSG-treated hamsters. This minor subgroup was sufficiently potent to normally synchronize the circadian rhythms to the Light/dark cycle in treated hamsters." @default.
- W2045507154 created "2016-06-24" @default.
- W2045507154 creator A5012452894 @default.
- W2045507154 date "1998-03-23" @default.
- W2045507154 modified "2023-10-01" @default.
- W2045507154 title "Retinal ganglion cells expressing the FOS protein after light stimulation in the Syrian hamster are relatively insensitive to neonatal treatment with monosodium glutamate" @default.
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- W2045507154 doi "https://doi.org/10.1002/(sici)1096-9861(19980323)392:4<458::aid-cne4>3.0.co;2-#" @default.
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