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Increased prolactin binding and morphological changes in the wound epithelium of regenerating limbs of Notophthalmus viridescens

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Summary

Distribution of prolactin has been examined in regenerating forelimbs from the newt Notophthalmus viridescens. Specific prolactin binding was demonstrated in homogenates of unamputated tissue, and of regenerating limbs at from 3 to 21 days postamputation. Labeled prolactin that was injected intraperitoneally into animals with one regenerating limb accumulated in the most distal portion of the regenerate at 7 and 14 days postamputation. Light microscopic autoradiography demonstrated that labeled prolactin was localized most heavily in the apical, outer layer of the wound epithelium. Scanning electron microscopy demonstrated that, in addition to changes in prolactin affinity following amputation, morphological changes occurred in the apical wound epithelium as well. Cell surfaces of the stump epidermis were characterized by periodic dispersion of papillae among a network of interconnecting structures 1–2 μm across. By contrast, the surfaces of cells from the area in which labeled prolactin was found to localize most intensely were characterized by lack of papillae and, depending on the stage of regeneration, a pattern of microvilli and microplicae. These morphological alterations appear to reflect functional and biochemical differences between stump epidermis and wound epithelium.

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Authors and Affiliations

  1. Department of Zoology, Michigan State University, East Lansing, Michigan, USA

    Stephen T. Furlong & Stephen C. Bromley

  2. Department of Microbiology, Michigan State University, East Lansing, Michigan, USA

    William G. Chancy

  3. Biological Science Program, Michigan State University, East Lansing, Michigan, USA

    Merle K. Heideman

Authors
  1. Stephen T. Furlong
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  2. William G. Chancy
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  3. Merle K. Heideman
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  4. Stephen C. Bromley
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Furlong, S.T., Chancy, W.G., Heideman, M.K. et al. Increased prolactin binding and morphological changes in the wound epithelium of regenerating limbs of Notophthalmus viridescens . Cell Tissue Res. 249, 411–419 (1987). https://doi.org/10.1007/BF00215525

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