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Video-enhanced technique for detecting neurophysin, enkephalin, and somatostatin immunoreactivity in ultrathin sections of cat median eminence

HD Coulter and RP Elde

A freeze-drying technique using epoxy-embedded ultrathin serial sections permits critical comparisons of neuropeptides in small fibers and varicosities of the nervous system by video-enhanced, light microscopic immunofluorescence. The desirability of the method was documented by data showing: retention of radioimmunoassayable somatostatin in freeze-substituted blocks of tissue as compared to its loss in tissue dehydrated in an alcohol series; feasibility of OsO4 vapor fixation of freeze-dried tissue and compatibility with neuropeptide immunocytochemistry, and utility of a silicon-intensified- tube video camera for recording low levels of fluorescence from ultrathin sections. Ultrathin serial sections, 150 nm thick, from the inner zone of freeze-dried median eminence of the cat revealed three populations of axons containing various combinations of neurophysin immunoreactivity and enkephalin immunoreactivity. Some elements contained neurophysin immunoreactivity alone, some contained both neurophysin immunoreactivity and enkephalin immunoreactivity, and a few elements contained enkephalin immunoreactivity alone. The adjacent external zone of the median eminence contained immunoreactivity for all three substances, but the structures in this region were too small to permit demonstration of coexistence in 150 nm thick sections.

Volume 34, Issue 11, pp. 1405-1415, 11/01/1986
Copyright © 1986 by The Histochemical Society


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H. Louis, J. Lavie, P. Lacolley, D. Daret, J. Bonnet, and J.-M. D. Lamazière
Freeze-drying Allows Double Nonradioactive ISH and Antigenic Labeling
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[Abstract] [Full Text]



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