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Immunohistochemical changes in the anterior olfactory nucleus of the developing rat


, : Immunohistochemical changes in the anterior olfactory nucleus of the developing rat. Developmental Psychobiology. 31(3): 181-192,.

The anterior olfactory nucleus (AON) is located caudal to the olfactory bulb in the olfactory peduncle. Although this important structure is involved in the bilateral coordination of olfactory information, relatively little is known about its development, structure, or function. The present report details results from an immunohistochemical examination of specific neuronal (microtubule-associated protein-2; MAP2, calbindin D28-k, neuropeptide-Y; NPY) and glial (astrocytes; glial fibrillary-associated protein, or GFAP, oligodendrocytes; RIP) populations in postnatal Days 10, 20 and 30 rats. MAP2-immunoreactivity (-ir), was present throughout the AON, although most dense in the outer plexiform layer. Increases in labeling occurred from Day 10 to Day 30, reflecting the maturation of dendritic processes. Both temporal and regional differences in expression were found with the two neuronal markers. For example, although substantial numbers of calbindin-ir cells were observed as early as Day 10, relatively few cells exhibited NPY-ir. An apparent decline in the number of stained figures was observed from days 20-30 with both markers. Most cells exhibiting calbindin- or NPY-ir were found in the inner half of the cellular zone of AON, GFAP-ir was localized mainly to the subependymal zone and the lateral olfactory tract (LOT) at Day 10, with successive increases in staining the cellular and plexiform layers at Days 20 and 30. Oligodendrocyte-ir was restricted to the anterior commissure and the LOT at Day 10, with dramatic increases in labeling of the cellular and plexiform layers observed by Days 20 and 30. These results represent some of the first analyses of the maturation of specific cellular phenotypes within this large neural region.

US$19.90

PMID: 9386920

DOI: 10.1002/(sici)1098-2302(199711)31:3<181::aid-dev3>3.0.co;2-o


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