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Vollum Institute for Advanced Biomedical Research (R.A.K.,
R.D.C.) Oregon Health Sciences University Portland,
Oregon 97201-3098
Millennium Pharmaceuticals, Inc.
(D.H., C.A.L.) Cambridge, Massachusetts 02139
Oregon Regional Primate Research Center (R.B.S.)
Beaverton, Oregon 97006
Dominant mutations at the agouti locus
induce several phenotypic changes in the mouse including yellow
pigmentation (phaeomelanization) of the coat and adult-onset obesity.
Nonpigmentary phenotypic changes associated with the agouti
locus are due to ectopic expression of the agouti-signaling protein
(ASP), and the pheomelanizing effects on coat color are due to ASP
antagonism of
-MSH binding to the melanocyte MC1 receptor. Recently
it has been demonstrated that pharmacological antagonism of
hypothalamic melanocortin receptors or genetic deletion of the
melanocortin 4 receptor (MC4-R) recapitulates aspects of the
agouti obesity syndrome, thus establishing that chronic
disruption of central melanocortinergic signaling is the cause of
agouti-induced obesity. To learn more about potential
downstream effectors involved in these melanocortinergic obesity
syndromes, we have examined expression of the orexigenic peptides
galanin and neuropeptide Y (NPY), as well as the anorexigenic POMC in
lethal yellow (Ay), MC4-R knockout
(MC4-RKO), and leptin-deficient (ob/ob) mice. No
significant changes in galanin or POMC gene expression were seen in any
of the obese models. In situ hybridizations using an
antisense NPY probe demonstrated that in obese
Ay mice, arcuate nucleus NPY mRNA levels
were equivalent to that of their C57BL/6J littermates. However, NPY was
expressed at high levels in a new site, the dorsal medial hypothalamic
nucleus (DMH). Expression of NPY in the DMH was also seen in obese
MC4-RKO homozygous (-/-) mice, but not in lean heterozygous (±) or
wild type (+/+) control mice. This identifies the DMH as a brain region
that is functionally altered by the disruption of melanocortinergic
signaling and suggests that this nucleus, possibly via elevated NPY
expression, may have an etiological role in the melanocortinergic
obesity syndrome.
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