Summary
The localization of high-affinity uptake sites for 3Hγ-aminobutyric acid (3H-GABA) was investigated in the rat duodenum during ontogenesis and also at the adult stage (from 15.5 days of fetal life up to 105 days post natum) by means of low- and high-resolution autoradiography. At all stages studied, specific endocrine cell types of the epithelium were labelled and an intense uptake was detected in the nervous tissue, especially in glial cells but also in scarce neurones. When the incubation medium was supplemented with β-alanine (1 mM), a blocker of the glial uptake for GABA, the labelling persisted only in endocrine cells and in few neurones. The intensity and the frequency of the labelling decreased at later periods compared to the earlier developmental stages. The GABA content of the duodenum as measured by a new ion-exchange column chromatography-HPLC-coupled method was higher in the early postnatal period compared to later stages. These observations suggest that GABA, in addition to being a neurotransmitter, may play an important role during development of the duodenum.
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Gilon, P., Reusens-Billen, B., Remacle, C. et al. Localization of high-affinity GABA uptake and GABA content in the rat duodenum during development. Cell Tissue Res. 249, 593–600 (1987). https://doi.org/10.1007/BF00217331
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DOI: https://doi.org/10.1007/BF00217331