Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 44, 299-304, Copyright © 1991 by Society for the Study of Reproduction

ARTICLES

Immunocytochemical localization of luteinizing hormone-releasing hormone within the olfactory bulb of pigs

LS Leshin, RD Kineman, JW Crim, GB Rampacek and RR Kraeling
United States Department of Agriculture, Agricultural Research Service, Athens, Georgia 30613.

LHRH was immunocytochemically localized within the olfactory bulb of prepubertal (n = 3), ovariectomized (n = 3), and hypophyseal-stalk- transected (HST) female pigs (n = 3). Perikarya of LHRH-immunoreactive neurons of all pigs were sparsely distributed mostly in the rostral half of the olfactory bulb, along the ventromedial and ventrolateral edge of the olfactory nerve layer, or at its interace with the glomerular layer. Processes from these cells and other LHRH containing axons either entered individual glomeruli forming a network within its interior or coursed around glomeruli penetrating into the external granular layers. Additional fibers penetrated into similar regions of the accessory olfactory bulb. Irregularly shaped perikarya were also detected within the internal granular layer of the ventral olfactory bulb, but only in tissue from HST pigs. From analysis of serial sections, there was no evidence of LHRH projections across the olfactory peduncle that connects the olfactory bulb with adjacent brain regions. If olfactory LHRH neurons are involved in reproductive behavior and physiology in the pig, this pathway involves additional unidentified intervening neurons. Endocrine factors probably influence the expression of immunoreactive LHRH in the internal granule layer, since their presence was revealed only in HST pigs.


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I. Salazar, P. Sanchez Quinteiro, M. Lombardero, N. Aleman, and P. Fernandez de Troconiz
The Prenatal Maturity of the Accessory Olfactory Bulb in Pigs
Chem Senses, January 1, 2004; 29(1): 3 - 11.
[Abstract] [Full Text] [PDF]


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Copyright © 1991 by the Society for the Study of Reproduction.