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[Cystathionine γ-lyase].

Halina Jurkowska1, Marta Kaczor-Kamińska1, Patrycja Bronowicka-Adamska1

  • 1Katedra Biochemii Lekarskiej, Uniwersytet Jagielloński, Collegium Medicum, Kraków.

Postepy Higieny I Medycyny Doswiadczalnej (Online)
|February 5, 2014
PubMed
Summary

Gamma-cystathionase (CTH) is crucial for L-cysteine metabolism and hydrogen sulfide (H2S) production. Reduced CTH expression leads to lower H2S levels, impacting blood pressure and cellular protection.

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • γ-Cystathionase (CTH) is a key enzyme in sulfur metabolism, catalyzing reactions involving sulfane sulfur compounds.
  • CTH plays a vital role in the L-cysteine desulfuration pathway and is involved in the endogenous production of hydrogen sulfide (H2S).
  • The human CTH gene exhibits genetic variations and alternative splicing, resulting in multiple isoforms.

Purpose of the Study:

  • To investigate the role of γ-Cystathionase (CTH) in cellular metabolism and physiological processes.
  • To understand the impact of CTH expression levels on cysteine, glutathione (GSH), and hydrogen sulfide (H2S) concentrations.
  • To explore the physiological consequences of altered H2S levels, particularly in relation to blood pressure regulation and oxidative stress.

Main Methods:

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  • Analysis of genetic variations and polymorphisms in the CTH encoding gene.
  • Studying the effects of decreased CTH expression on cellular metabolite levels (cysteine, GSH, taurine, H2S).
  • Utilizing CTH knockout mouse models to assess physiological changes, including blood pressure and vascular function.
  • Investigating the impact of CTH gene overexpression on H2S production.

Main Results:

  • Decreased CTH expression leads to reduced levels of cysteine, GSH, taurine, and H2S, causing cystathioninuria.
  • CTH knockout mice exhibit lower H2S levels, hypertension, and impaired vascular endothelium relaxation.
  • Overexpression of CTH enhances H2S production.
  • Endogenous H2S produced by CTH contributes to vasodilation, blood pressure regulation, neuronal protection against oxidative stress, and increased GSH levels.

Conclusions:

  • CTH is essential for maintaining cellular homeostasis of sulfur-containing compounds and endogenous H2S production.
  • CTH-derived H2S is a critical regulator of blood pressure and vascular function.
  • CTH plays a protective role against oxidative stress in neurons and supports cellular defense mechanisms through GSH regulation.