Summary
A somatostatin-like substance is demonstrated by light microscopic immunohistochemistry (PAP-method) in perikarya and cell processes of the retina of adult and infant rats. These perikarya are identified according to their size, arrangement and distribution. Each of the first two neuronal orders (receptors, bipolar cells, ganglionic cells) of the visual pathway can be associated with retinal cells reacting positively with anti-somatostatin. In the adult rat, perikarya and processes of (i) horizontal cells, (ii) amacrine cells and (iii) large neurons in the ganglionic layer are specifically labeled. The staining of middle-sized and small ganglion cells is probably caused by the close attachment of labeled fibers to non-reacting cells. Postnatally, the immunoreactive elements develop in parallel to the differentiation of the corresponding retinal layers. It is discussed whether the three types of retinal cells containing a somatostatin-like substance provide an inhibitory system to each of the two orders of retinal neurons.
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Supported by the Deutsche Forschungsgemeinschaft (Grant Nr. Kr 569/2) and Stiftung Volkswagenwerk
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Krisch, B., Leonhardt, H. Demonstration of a somatostatin-like activity in retinal cells of the rat. Cell Tissue Res. 204, 127–140 (1979). https://doi.org/10.1007/BF00235169
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DOI: https://doi.org/10.1007/BF00235169