Altered NPY and AgRP in membrane type-1 matrix metalloproteinase-deficient mice.
Membrane-type-1 matrix metalloproteinase (MT1-MMP) knockout (KO) mice fail to gain weight and die 3-4 weeks after birth. To understand the wasting phenotype in MT1-MMP-KO mice we studied the expression of some hypothalamic neuropeptides involved in control of appetite and body weight. In MT1-MMP-KO mice, neuronal perikarya in the arcuate nucleus displayed accumulations of NPY and agouti-related protein (AgRP) immunoreactivity (-ir). In contrast, NPY-ir and AgRP-ir were reduced in the projection areas of the arcuate neurons. NPY and AgRP are known to relay metabolic signals from the periphery into the brain to stimulate body weight gain. Their altered subcellular distribution suggests that MT1-MMP is involved in postnatal development of the arcuate NPY/AgRP-system which may contribute to the generation of the wasting phenotype.
Byrne
Leah C
LC
Department of Neuroscience, Karolinska Institutet, Retzius väg 8, 17177, Stockholm, Sweden.
Zhou
Zhongjun
Z
Tryggvason
Karl
K
Hökfelt
Tomas
T
Fetissov
Sergueï O
SO
D054369:Agouti-Related Protein; D000818:Animals; D001066:Appetite / Q000235:genetics / Q000502:physiology; D001111:Arcuate Nucleus of Hypothalamus / Q000378:metabolism; D001835:Body Weight / Q000235:genetics / Q000502:physiology; D015342:DNA Probes; D007031:Hypothalamus / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D036341:Intercellular Signaling Peptides and Proteins; D020781:Matrix Metalloproteinase 1 / Q000235:genetics*; D051379:Mice; D018345:Mice, Knockout; D009434:Neural Pathways / Q000378:metabolism; D009478:Neuropeptide Y / Q000235:genetics / Q000378:metabolism*; D010641:Phenotype; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
D054369:Agouti-Related Protein; C515199:Agrp protein, mouse; D015342:DNA Probes; D036341:Intercellular Signaling Peptides and Proteins; D009478:Neuropeptide Y; D011506:Proteins; D020781:Matrix Metalloproteinase 1