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Journal of Biological Rhythms
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Axon-Sparing Lesions of the Hypothalamic Paraventricular Nucleus Abolish Gonadal Responses to Photoperiod in Male Syrian Hamsters

Michael H. Brown

Department of Psychology and Neuroscience Program, 223 Psychology Research Building, Michigan State University, East Lansing, Michigan 48824-1117

Lori L. Badura

Department of Psychology and Neuroscience Program, 223 Psychology Research Building, Michigan State University, East Lansing, Michigan 48824-1117

Antonio A. Nunez

Department of Psychology and Neuroscience Program, 223 Psychology Research Building, Michigan State University, East Lansing, Michigan 48824-1117

Intrahypothalamic injections of the excitotoxin N-methyl-D,L-aspartic acid (NMA) that destroyed the parvocellular regions of the paraventricular nucleus (PVN) prevented go nadal regression in male hamsters (Mesocricetus auratus) kept in short days (LD 6:18). After 17 weeks in short days, these NMA-injected animals had large, functional gonads and dis played all components of male sexual behavior. These findings confirm that neurons of the PVN are part of the pathway that mediates photoperiodism in hamsters.

Journal of Biological Rhythms, Vol. 3, No. 1, 59-69 (1988)
DOI: 10.1177/074873048800300105
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