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Departments of Psychology and of Biology, Neuropsychology and Behavioral Neurosciences, and Neurobiology Programs, Georgia State University, Atlanta, Georgia 30303
White adipose tissue (WAT) is innervated by postganglionic sympathetic nervous system (SNS) neurons, suggesting that lipid mobilization could be regulated by the SNS [T. G. Youngstrom and T. J. Bartness. Am. J. Physiol. 268 (Regulatory Integrative Comp. Physiol. 37): R744-R751, 1995]. A viral transsynaptic retrograde tract tracer, the pseudorabies virus (PRV), was used to identify the origins of the SNS outflow from the brain to WAT neuroanatomically. PRV was injected into epididymal or inguinal WAT (EWAT and IWAT, respectively) of Siberian hamsters and IWAT of rats. PRV-infected neurons were visualized by immunocytochemistry and found in the spinal cord, brain stem (medulla, nucleus of the solitary tract, caudal raphe nucleus, C1 and A5 regions), midbrain (central gray), and several areas within the forebrain. The general pattern of infection of WAT in both species was more similar than different and resembled that seen after PRV injections into the adrenal medulla in rats (A. M. Strack, W. B. Sawyer, J. H. Hughes, K. B. Platt, and A. D. Loewy. Brain Res. 491: 156-162, 1989). EWAT versus IWAT injected hamsters had relatively less labeling in the suprachiasmatic, dorsomedial, and arcuate nuclei. Overall, it appeared that the SNS innervation of WAT originates from the general SNS outflow of the central nervous system and therefore may play a significant role in lipid mobilization.
pseudorabies virus; hamsters; rats; lipolysis; obesity; paraventricular nucleus; suprachiasmatic nucleus
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