Effects of a block in cysteine catabolism on energy balance and fat metabolism in mice.

Journal Article (Journal Article)

To gain further insights into the effects of elevated cysteine levels on energy metabolism and the possible mechanisms underlying these effects, we conducted studies in cysteine dioxygenase (Cdo1)-null mice. Cysteine dioxygenase (CDO) catalyzes the first step of the major pathway for cysteine catabolism. When CDO is absent, tissue and plasma cysteine levels are elevated, resulting in enhanced flux of cysteine through desulfhydration reactions. When Cdo1-null mice were fed a high-fat diet, they gained more weight than their wild-type controls, regardless of whether the diet was supplemented with taurine. Cdo1-null mice had markedly lower leptin levels, higher feed intakes, and markedly higher abundance of hepatic stearoyl-CoA desaturase 1 (SCD1) compared to wild-type control mice, and these differences were not affected by the fat or taurine content of the diet. Thus, reported associations of elevated cysteine levels with greater weight gain and with elevated hepatic Scd1 expression are also seen in the Cdo1-null mouse model. Hepatic accumulation of acylcarnitines suggests impaired mitochondrial β-oxidation of fatty acids in Cdo1-null mice. The strong associations of elevated cysteine levels with excess H2 S production and impairments in energy metabolism suggest that H2 S signaling could be involved.

Full Text

Duke Authors

Cited Authors

  • Niewiadomski, J; Zhou, JQ; Roman, HB; Liu, X; Hirschberger, LL; Locasale, JW; Stipanuk, MH

Published Date

  • January 2016

Published In

Volume / Issue

  • 1363 /

Start / End Page

  • 99 - 115

PubMed ID

  • 26995761

Pubmed Central ID

  • PMC4802499

Electronic International Standard Serial Number (EISSN)

  • 1749-6632

Digital Object Identifier (DOI)

  • 10.1111/nyas.13021


  • eng

Conference Location

  • United States