PMID- 2153898 OWN - NLM STAT- MEDLINE DCOM- 19900301 LR - 20190824 IS - 0169-328X (Print) IS - 0169-328X (Linking) VI - 7 IP - 1 DP - 1990 Jan TI - Day-night variation in prepro vasoactive intestinal peptide/peptide histidine isoleucine mRNA within the rat suprachiasmatic nucleus. PG - 85-9 AB - Neurons within the suprachiasmatic nuclei of the hypothalamus (SCN) appear to function as a circadian clock that controls the timing of many physiological systems. The SCN contain several chemically distinct neuronal subpopulations, including a large group of interneurons within the ventrolateral SCN that exhibit co-localizable immunoreactivity for both vasoactive intestinal peptide (VIP) and peptide histidine isoleucine (PHI). The purpose of the present study was to determine whether VIP/PHI neurons within the rat SCN exhibit rhythmicity in the cellular levels of the messenger RNA encoding the precursor from which both VIP and PHI are derived. Using both quantitative in situ and solution hybridization prepro-VIP/PHI mRNA levels early in the dark phase were demonstrated to be significantly higher than those 5 h after the onset of the daily light period. Since no statistically reliable (P greater than 0.05) day-night variation was observed in the levels of prepro-VIP/PHI mRNA within cortex, these data suggest that the rhythmicity in prepro-VIP/PHI mRNA is an intrinsic property of VIP/PHI-containing SCN neurons, or rhythmically driven by local synaptic events within the SCN. FAU - Albers, H E AU - Albers HE AD - Department of Biology, Georgia State University, Atlanta 30303. FAU - Stopa, E G AU - Stopa EG FAU - Zoeller, R T AU - Zoeller RT FAU - Kauer, J S AU - Kauer JS FAU - King, J C AU - King JC FAU - Fink, J S AU - Fink JS FAU - Mobtaker, H AU - Mobtaker H FAU - Wolfe, H AU - Wolfe H LA - eng GR - 1K 11AG00295-02/AG/NIA NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - Netherlands TA - Brain Res Mol Brain Res JT - Brain research. Molecular brain research JID - 8908640 RN - 0 (Peptide PHI) RN - 0 (Protein Precursors) RN - 0 (RNA, Messenger) RN - 37221-79-7 (Vasoactive Intestinal Peptide) RN - 81032-41-9 (preprovasoactive intestinal peptide) SB - IM MH - Animals MH - *Circadian Rhythm MH - Male MH - Nucleic Acid Hybridization MH - Peptide PHI/*metabolism/physiology MH - Protein Precursors/*metabolism/physiology MH - RNA, Messenger/*metabolism MH - Rats MH - Suprachiasmatic Nucleus/*metabolism/physiology MH - Vasoactive Intestinal Peptide/*metabolism/physiology EDAT- 1990/01/01 00:00 MHDA- 1990/01/01 00:01 CRDT- 1990/01/01 00:00 PHST- 1990/01/01 00:00 [pubmed] PHST- 1990/01/01 00:01 [medline] PHST- 1990/01/01 00:00 [entrez] AID - 0169-328X(90)90077-Q [pii] AID - 10.1016/0169-328x(90)90077-q [doi] PST - ppublish SO - Brain Res Mol Brain Res. 1990 Jan;7(1):85-9. doi: 10.1016/0169-328x(90)90077-q.