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      Induction of Persistent Estrus by Constant Light: Effects of Neonatal Constant Light and Harderian Gland Function

      Neuroendocrinology

      S. Karger AG

      Constant light, Persistent estrus, Harderianectomy, Harderian gland, Homogenate, Hematoporphyrin, Rats

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          Abstract

          The effect of constant light on the age at onset of persistent estrus was compared in rats exposed to constant light since birth (LL-0) and those exposed beginning at 70 days of age (LL-70). Persistent estrus occurred about 27 days later in the LL-0 rats than in the LL-70 rats. Exposure to LL for just the 1st 15 days of life (LL-0-15) and then subsequent exposure to LL at 71 days also delayed the induction of persistent estrus. Neonatal injection of a Harderian gland (HG) homogenate to LL-0–15 rats reduced the age of vaginal opening and 1st estrus and reduced the delayed onset of persistent estrus caused by the neonatal LL. Harderianectomy of LL-0 or hematoporphyrin injections in LL-0–15 rats had no effect on the onset of LL-induced persistent estrus.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1978
          1978
          26 March 2008
          : 27
          : 5-6
          : 193-203
          Affiliations
          Department of Anatomy, Tokyo Medical College, Shinjuku-ku, Tokyo
          Article
          122812 Neuroendocrinology 1978;27:193–203
          10.1159/000122812
          569774
          © 1978 S. Karger AG, Basel

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          Page count
          Pages: 11
          Categories
          Paper

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