The uptake of amino acids by mouse pancreas in vitro

Clayman, S.; Scholefield, P. G.

doi:10.1016/0005-2736(69)90111-4

Cited by 22 publications

(1 citation statement)

References 23 publications

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“…The cyclic amino acid appears to use the L-site primarily, whereas entry of AIB is distributed between a number of sites. Other investigations have demonstrated that the L-site serves mainly for exchange in several tissues including Ehrlich carcinoma cells, 15 reticulocytes of rabbits, 22 mature mammalian erythrocytes, 23 and the pancreas of the mouse; 24 and that cycloleucine is a better exchanger than AIB. 15 > 2i The rate coefficient found for efflux by exchange of lenticular cycloleucine was 2.7 times that of AIB, and probably reflects the greater affinity of the former amino acid for the L-site.…”

Section: Discussionmentioning

confidence: 99%

Efflux of Amino Acids from the Lens1

Kern¹,

Brassil²,

Wolf³

Biochemistry of the Eye

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Estimation of efflux of amino acids from the viammalian lens indicates it is of small magnitude compared to influx at equivalent nonsaturating levels of substrate. This finding is a necessary part of the explanation of the complex problem of the maintenance of elevated, intracellular levels of these substances. Accelerative countertransport was observed when appropriate amino acids were present on the trans side of the plasma membrane; this phenomenon provides evidence of a mediated path for exodus. The two neutral amino acids examined had rate coefficients for efflux which were similar, and approximately equal to rate coefficients for the nonsaturable component of entry of this category of substrates. On the other hand, the rate coefficient for efflux of L-lysine exceeded that which could be attributed to a nonsaturable process; the difference may be due to lower levels of endogenous, competing diamino acids compared with the neutral amino acids.

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Section: Discussionmentioning

confidence: 99%