Evaluation of hypothalamic gene expression in mice divergently selected for heat loss.
Mouse lines divergently selected for heat loss were evaluated for correlated responses in the hypothalamic transcriptome. High (MH) heat loss mice have approximately 50% greater heat loss, approximately 35% less body fat, approximately 20% greater feed intake, approximately 100% greater locomotor activity levels, and higher core body temperature compared with low (ML) heat loss mice. We evaluated hypothalamic expression between inbred lines derived from MH and ML lines (IH and IL, respectively) using cDNA microarrays and selected genes previously isolated in a large differential-display PCR experiment. Northern analysis was used to confirm differences, revealing higher hypothalamic mRNA expression of oxytocin (Oxt) and tissue inhibitor of metalloproteinase 2 (Timp-2) in the IH line. Real-time PCR assays were developed for Oxt, Timp-2, and ribosomal protein L3 (Rpl3, previously found to be upregulated in IL) and confirmed differential expression of these genes with potential physiological relevance in energy balance. These results provide information on correlated responses in the transcriptome of mice selected for high and low energy expenditure and reveal new information regarding genetic regulation of energy balance.
Wesolowski
Stephanie R
SR
Department of Animal Science, University of Nebraska, Lincoln, Nebraska 68583-0908, USA.
Allan
Mark F
MF
Nielsen
Merlyn K
MK
Pomp
Daniel
D
D000818:Animals; D015152:Blotting, Northern; D001833:Body Temperature Regulation / Q000235:genetics*; D002874:Chromosome Mapping / Q000379:methods; D003199:Computer Systems; D020224:Expressed Sequence Tags; D005260:Female; D020869:Gene Expression Profiling / Q000379:methods*; D023061:Gene Order; D007031:Hypothalamus / Q000737:chemistry* / Q000378:metabolism*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008969:Molecular Sequence Data; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012313:RNA / Q000235:genetics; D000090822:Ribosomal Protein L3
D000090822:Ribosomal Protein L3; C000716548:Rpl3 protein, mouse; D012313:RNA