期刊
JOURNAL OF MOLECULAR NEUROSCIENCE
卷 25, 期 3, 页码 251-258出版社
HUMANA PRESS INC
DOI: 10.1385/JMN:25:3:251
关键词
calmodulin; two-dimensional gel electrophoresis; knockout; PAC(1); receptor; photic entrainment; pituitary adenylate cyclase-activating polypeptide; proteomics; suprachlasmatic nucleus
In mammals circadian rhythms are generated by a light-entrainable oscillator located in the hypothalamic suprachiasmatic nucleus (SCN). Light signals reach the SCN via a monosynaptic neuronal pathway, the retino-hypothalamic tract, originating in a subset of retinal ganglion cells. The nerve terminals of these cells contain the classical neurotransmitter glutamate and the neuropeptide pituitary adenylate cyclase-activating polypeptide (PACAP), and there is evidence that these two transmitters interact to mediate photoentrainment of the oscillator in the SCN. To elucidate light-provoked PACAP receptor signaling we used proteomic analysis. Wildtype mice and mice lacking the PAC(1) receptor (PAC(1)(-/-)) were light stimulated at early night, and the SCN was examined for proteins that were differentially expressed using two-dimensional gel electrophoresis and identification by tandem mass spectrometry The most striking finding, which was subsequently confirmed by Western blotting, was a significant reduction of calmodulin (CaM) in wild-type mice as compared with PAC(1)(-/-) mice. Analysis at the mRNA level by quantitative in situ hybridization histochemistry was inconclusive, indicating that a translational mechanism might be involved. The findings indicate that PAC(1) receptor signaling in the SCN in response to light stimulation induces a down-regulation of CaM expression and that CaM is involved in the photic-entrainment mechanism.
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