Abstract
The effect of tryptophan and three major metabolites of tryptophan on the rabbit lens electrolyte balance was examined. Even at 3 × 10-3 M tryptophan, tryptamine and xanthurenic acid had no effect on lens sodium, potassium and calcium content after a 20 hr incubation. Small but significant changes in lens sodium and potassium content were induced by 20 hr incubation in 2 × 10-3 M 3-hydroxy-DL-kynurenine and 10-3 M hydroxyanthranilic acid. Lens Na,K-ATPase activity was unaffected by 3 × 10-3 M tryptophan. Tryptamine reduced, to a small extent, Na,K-ATPase activity at 3 × 10-3 M, but was without effect at 10-3 M. 3-hydroxy-DL-kynurenine (2 × 10-3 M) and 3-hydroxyanthranilic acid (10-3 M) inhibited Na,K-ATPase activity by 27% and 30% respectively. Only 3-hydroxy-DL-kynurenine had a demonstrable effect on 86Rb uptake. It is concluded that, in contrast to findings in the amphibian lens, metabolites of tryptophan have minimal or no detrimental effects upon rabbit lens electrolyte balance under the in vitro conditions of these experiments. However, this does not rule out a long term effect of these compounds should they accumulate in the lens.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 309-315 |
| Number of pages | 7 |
| Journal | Current Eye Research |
| Volume | 2 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1982 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Ophthalmology
- Sensory Systems
- Cellular and Molecular Neuroscience
Cite this
The influence of tryptophan and its metabolites upon rabbit Lens electrolyte balance. / Kishida, K.; Paterson, C. A.; Delamere, Nicholas A.
In: Current Eye Research, Vol. 2, No. 5, 1982, p. 309-315.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The influence of tryptophan and its metabolites upon rabbit Lens electrolyte balance
AU - Kishida, K.
AU - Paterson, C. A.
AU - Delamere, Nicholas A
PY - 1982
Y1 - 1982
N2 - The effect of tryptophan and three major metabolites of tryptophan on the rabbit lens electrolyte balance was examined. Even at 3 × 10-3 M tryptophan, tryptamine and xanthurenic acid had no effect on lens sodium, potassium and calcium content after a 20 hr incubation. Small but significant changes in lens sodium and potassium content were induced by 20 hr incubation in 2 × 10-3 M 3-hydroxy-DL-kynurenine and 10-3 M hydroxyanthranilic acid. Lens Na,K-ATPase activity was unaffected by 3 × 10-3 M tryptophan. Tryptamine reduced, to a small extent, Na,K-ATPase activity at 3 × 10-3 M, but was without effect at 10-3 M. 3-hydroxy-DL-kynurenine (2 × 10-3 M) and 3-hydroxyanthranilic acid (10-3 M) inhibited Na,K-ATPase activity by 27% and 30% respectively. Only 3-hydroxy-DL-kynurenine had a demonstrable effect on 86Rb uptake. It is concluded that, in contrast to findings in the amphibian lens, metabolites of tryptophan have minimal or no detrimental effects upon rabbit lens electrolyte balance under the in vitro conditions of these experiments. However, this does not rule out a long term effect of these compounds should they accumulate in the lens.
AB - The effect of tryptophan and three major metabolites of tryptophan on the rabbit lens electrolyte balance was examined. Even at 3 × 10-3 M tryptophan, tryptamine and xanthurenic acid had no effect on lens sodium, potassium and calcium content after a 20 hr incubation. Small but significant changes in lens sodium and potassium content were induced by 20 hr incubation in 2 × 10-3 M 3-hydroxy-DL-kynurenine and 10-3 M hydroxyanthranilic acid. Lens Na,K-ATPase activity was unaffected by 3 × 10-3 M tryptophan. Tryptamine reduced, to a small extent, Na,K-ATPase activity at 3 × 10-3 M, but was without effect at 10-3 M. 3-hydroxy-DL-kynurenine (2 × 10-3 M) and 3-hydroxyanthranilic acid (10-3 M) inhibited Na,K-ATPase activity by 27% and 30% respectively. Only 3-hydroxy-DL-kynurenine had a demonstrable effect on 86Rb uptake. It is concluded that, in contrast to findings in the amphibian lens, metabolites of tryptophan have minimal or no detrimental effects upon rabbit lens electrolyte balance under the in vitro conditions of these experiments. However, this does not rule out a long term effect of these compounds should they accumulate in the lens.
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U2 - 10.3109/02713688209000775
DO - 10.3109/02713688209000775
M3 - Article
C2 - 6219861
AN - SCOPUS:0020403625
VL - 2
SP - 309
EP - 315
JO - Current Eye Research
JF - Current Eye Research
SN - 0271-3683
IS - 5
ER -