Abstract
The distributions of neuronal nitric oxide synthase immunoreactivity (NOS-IR) and NADPH-diaphorase (NADPH-d) activity were compared in the cat spinal cord. NOS-IR in neurons around the central canal, in superficial laminae (I and II) of the dorsal horn, in the dorsal commissure, and in fibers in the superficial dorsal horn was observed at all levels of the spinal cord. In these regions, NOS-IR paralleled NADPH-d activity. The sympathetic autonomic nucleus in the rostral lumbar and thoracic segments exhibited prominent NOS-IR and NADPH-d activity, whereas the parasympathetic nucleus in the sacral segments did not exhibit NOS-IR or NADPH-d activity. Within the region of the sympathetic autonomic nucleus, fewer NOS-IR cells were identified compared with NADPH-d cells. The most prominent NADPH-d activity in the sacral segments occurred in fibers within and extending from Lissauer's tract in laminae I and V along the lateral edge of the dorsal horn to the region of the sacral parasympathetic nucleus. These afferent projections did not exhibit NOS-IR; however, NOS-IR and NADPH-d activity were demonstrated in dorsal root ganglion cells (L7-S2). The results of this study demonstrate that NADPH-d activity is not always a specific histochemical marker for NO-containing neural structures.
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Vizzard, M.A., Erdman, S.L., Roppolo, J.R. et al. Differential localization of neuronal nitric oxide synthase immunoreactivity and NADPH-diaphorase activity in the cat spinal cord. Cell Tissue Res. 278, 299–309 (1994). https://doi.org/10.1007/BF00414174
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DOI: https://doi.org/10.1007/BF00414174