Ontogenic changes of kynurenine aminotransferase I activity and its expression in the chicken retina

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Abstract

Kynurenine aminotransferases are key enzymes for the synthesis of kynurenic acid (KYNA), an endogenous glutamate receptor antagonist. The study described here examined ontogenic changes of kynurenine aminotransferase I (KAT I) activity and its expression in the chicken retina. KAT I activity measured on embryonic day 16 (E16) was significantly higher than at all other stages (E12, P0 and P7). Double labeling with antibodies against glutamine synthetase showed that on P7 KAT I was expressed in Müller cell endfeet and their processes in the inner retina. Since KAT I activity is high in the late embryonic stages, it is conceivable that it plays a neuromodulatory role in the retina during the late phase of embryogenesis. © 2003 Elsevier Science Ltd. All rights reserved.

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Rejdak, R., Zielinska, E., Shenk, Y., Turski, W. A., Okuno, E., Zarnowski, T., … Kohler, K. (2003). Ontogenic changes of kynurenine aminotransferase I activity and its expression in the chicken retina. Vision Research, 43(14), 1513–1517. https://doi.org/10.1016/S0042-6989(03)00233-5

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