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Pinealocytes immunoreactive with antisera against secretory glycoproteins of the subcommissural organ: A comparative study

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By means of light-microscopic immunocyto-chemistry two polyclonal antibodies (AFRU, ASO; see p. 470) directed against secretory glycoproteins of the subcom-missural organ were shown to cross-react with cells in the pineal organ of lamprey larvae, coho salmon, a toad, two species of lizards, domestic fowl, albino rat and bovine (taxonomic details, see below). The AFRU-immunoreactive cells were identified as pinealocytes of the receptor line (pineal photoreceptors, modified photoreceptors or classical pinealocytes, respectively) either due to their characteristic structural features or by combining AFRU-immunoreaction with S-antigen and opsin immunocytochemistry in the same or adjacent sections. Depending on the species, AFRU- or ASO-immunoreactions were found in the entire perikaryon, inner segments, perinuclear area, and in basal processes facing capillaries or the basal lamina. In most cases, only certain populations of pinealocytes were immunolabeled; these cells were arranged in a peculiar topographical pattern. In lamprey larvae, immunoreactive pinealocytes were observed only in the pineal organ, but not in the parapineal organ. In coho salmon, the immunoreaction occurred in S-antigen-positive pinealocytes of the pineal end-vesicle, but was absent from S-antigen-immunoreactive pinealocytes of the stalk region. In the rat, AFRU-immunoreaction was restricted to S-antigen-immunoreactive pinealocytes found in the deep portion of the pineal organ and the habenular region. These findings support the concept that several types of pinealocytes exist, which differ in their molecular, biochemical and functional features. They also indicate the possibility that the AFRU- and ASO-immunoreactive material found in certain pinealocytes might represent a proteinaceous or peptidic compound, which is synthesized and released from a specialized type of pinealocyte in a hormone-like fashion. This cell type may share functional characteristics with peptidergic neurons or paraneurons.

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Authors and Affiliations

  1. Instituto de Histología y Patología, Universidad Austral de Chilc, Valdivia, Chile

    Esteban M. Rodríguez, Carlos R. Yulis & Silvia Hein

  2. Department of Anatomy and Cytobiology, Justus Liebig University of Giessen, Giessen, Germany

    Horst-W. Korf &  Andreas Oksche

Authors
  1. Esteban M. Rodríguez
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  2. Horst-W. Korf
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  3. Andreas Oksche
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  4. Carlos R. Yulis
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  5. Silvia Hein
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Additional information

Supported by Grant I 38259 from the Stiftung Volkswagenwerk, Federal Republic of Germany, to E.M.R. and A.O.; Grant S-85-39 from the Direccion de Investigaciones, Universidad Austral de Chile, to E.M.R.; Grant 187 from FONDECYT, Chile, to C.R.Y.; and Grant Ko 758/3-1 from the Deutsche Forschungsgemeinschaft, Federal Republic of Germany, to H.W.K.

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Rodríguez, E.M., Korf, HW., Oksche, A. et al. Pinealocytes immunoreactive with antisera against secretory glycoproteins of the subcommissural organ: A comparative study. Cell Tissue Res. 254, 469–480 (1988). https://doi.org/10.1007/BF00226496

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