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      GABA Transport and Subcellular Distribution in the Rat Anterior Pituitary Gland

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          Abstract

          In this investigation we have studied the uptake of gamma aminobutyric acid (GABA) into anterior pituitary slices. Tissue:medium ratios of about 45:1 were obtained after a 30-min incubation. The process responsible for <sup>3</sup>H-GABA uptake was temperature-sensitive and sodium-dependent. The kinetic constants of saturable GABA transport were: K<sub>m</sub> 4.141 µ M and V<sub>max</sub> 0.973 pmol/min/mg protein, at 25 °C. The incorporation of GABA into anterior pituitary was inhibited by specific inhibitors of neuronal and/or glial uptake. The subcellular distribution of GABA was investigated by continuous sucrose density gradients and differential centrifugation. Most of the endogenous and labelled GABA was present in the soluble fraction. However, a small part of GABA was found in the particulate fraction. These observations indicate that the anterior pituitary gland is able to concentrate GABA which interacts with intracellular particles.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1994
          1994
          08 April 2008
          : 59
          : 2
          : 183-188
          Affiliations
          Centro de Investigaciones en Reproducción, Facultad de Medicina, Universidad de Buenos Aires, Argentina
          Article
          126657 Neuroendocrinology 1994;59:183–188
          10.1159/000126657
          8127409
          © 1994 S. Karger AG, Basel

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          Page count
          Pages: 6
          Categories
          Biology of Pituitary Cells

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