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Research ArticleArticle

HISTOCHEMICAL AND FINE STRUCTURAL ASPECTS OF THE ONSET OF DENERVATION SUPERSENSITIVITY IN THE NICTITATING MEMBRANE OF THE SPINAL CAT

L. S. Van Orden III, K. G. Bensch, S. Z. Langer and U. Trendelenburg
Journal of Pharmacology and Experimental Therapeutics August 1967, 157 (2) 274-283;
L. S. Van Orden III
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K. G. Bensch
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S. Z. Langer
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U. Trendelenburg
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Abstract

The reduction in endogenous stores of norepinephrine after denervation of the cat nictitating membrane (Smith et al., J. Pharmacol. Exp. Therap. 151: 87-94, 1966) was observed, in the present study, to have morphologic correlates in a diminution of catecholamine fluorescence, as determined microfluorometrically, and a reduction in the proportion of granular vesicles in electron micrographs of adrenergic nerve endings. The progression of fine structural changes during the process of degeneration of the nerve endings was described. The number of intact nerve endings remaining on electron-microscopic examination correlated well with the previously described (Smith et al., 1966) decrease in ability to retain exogenous H3- norepinephrine. Further evidence is thus presented for the hypothesis that the degeneration contraction of cat nictitating membrane is due to leakage of endogenous transmitter from degenerating nerve endings. Furthermore, morphologic support is provided for the explanation of denervation supersensitivity on the basis of inability of denervated tissue to retain exogenous norepinephrine. An observed lack of linear relationship between catecholamine fluorescence of nerve endings and endogenous norepinephrine content may be due to unequal sensitivity of the catecholarnine histochemical method to intra- and extravesicular norepinephrine.

Footnotes

    • Received December 1, 1966.
    • Accepted January 31, 1967.
  • © 1967 by The Williams & Wilkins Company

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Journal of Pharmacology and Experimental Therapeutics
Vol. 157, Issue 2
1 Aug 1967
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Research ArticleArticle

HISTOCHEMICAL AND FINE STRUCTURAL ASPECTS OF THE ONSET OF DENERVATION SUPERSENSITIVITY IN THE NICTITATING MEMBRANE OF THE SPINAL CAT

L. S. Van Orden, K. G. Bensch, S. Z. Langer and U. Trendelenburg
Journal of Pharmacology and Experimental Therapeutics August 1, 1967, 157 (2) 274-283;

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Research ArticleArticle

HISTOCHEMICAL AND FINE STRUCTURAL ASPECTS OF THE ONSET OF DENERVATION SUPERSENSITIVITY IN THE NICTITATING MEMBRANE OF THE SPINAL CAT

L. S. Van Orden, K. G. Bensch, S. Z. Langer and U. Trendelenburg
Journal of Pharmacology and Experimental Therapeutics August 1, 1967, 157 (2) 274-283;
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