Abstract
Hydrogen sulfide (H2S) is a novel gasotransmitter with physiological and pathological functions in vascular homeostasis, cardiovascular system and central nervous system. In the present study, we determined the endogenous levels of H2S in various tissues of the bovine eye. We also examined the basal levels of H2S in response to donors (sodium hydrosulfide, NaHS and sodium sulfide, Na2S), substrate (l-cysteine), inhibitors (propargylglycine, PAG and aminooxyacetic acid, AOA) and activator (S-adenosyl-l-methionine, SAM) of this gas in the bovine retina. H2S was measured using a well established spectrophotometric method. The highest concentration of endogenous H2S was detected in cornea (19 ± 2.85 nmoles/mg protein, n = 6) and retina (17 ± 2.1 nmoles/mg protein, n = 6). Interestingly, H2S was not present in vitreous humor. The inhibitors of CSE and CBS; PAG (1 mM) and AOA (1 mM), significantly attenuated the production of H2S in the bovine retina by 56.8 and 42%, respectively. On the other hand the activator of CBS; SAM (100 μM), H2S donors; NaHS (1 μM) and Na2S (100 μM), significantly increased endogenous levels of H2S in bovine retina. l-cysteine (10–300 μM) produced a significant (P < 0.05) concentration-dependent increase in H2S levels reaching a maximal at 300 μM. We conclude that H2S is endogenously produced in various tissues of the isolated bovine eye. Moreover, endogenous levels of H2S are enhanced in the presence of substrate (l-cysteine), an activator of CBS (SAM) and H2S donors but are blocked by inhibitors of enzymes that synthesize this gas in neural retina.
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Abbreviations
- H2S:
-
Hydrogen sulfide
- CSE:
-
Cystathionine γ-lyase
- CBS:
-
Cystathionine β-synthase
- PAG:
-
Propargylglycine
- AOA:
-
Aminooxyacetic acid
- SAM:
-
S-adenosyl-l-methionine
- NaHS:
-
Sodium hydrosulfide
- Na2S:
-
Sodium sulfide
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Kulkarni, M., Njie-Mbye, Y.F., Okpobiri, I. et al. Endogenous Production of Hydrogen Sulfide in Isolated Bovine Eye. Neurochem Res 36, 1540–1545 (2011). https://doi.org/10.1007/s11064-011-0482-6
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DOI: https://doi.org/10.1007/s11064-011-0482-6