Altered carnitine metabolism in spontaneously hypertensive rats

K. A. Foster, B. O'Rourke, D. K. Reibel

Research output: Contribution to journalArticle

Abstract

Carnitine metabolism was examined in spontaneously hypertensive rats (SHR). Carnitine levels were elevated by 25% in hypertrophied hearts of 10- and 15-wk-old SHR when compared with Wistar-Kyoto (WKy) controls. This elevation was associated with a greater than 25% increase in total serum carnitine. The elevated serum carnitine does not appear to be due to increased mobilization from skeletal muscle because carnitine levels were elevated by 25% in gastrocnemius and diaphragm of SHR. Elevated serum carnitine is also not a result of reduced urinary excretion because daily urinary carnitine output was increased by 150% in SHR. These findings suggest that the most likely mechanisms for increased serum carnitine is increased carnitine synthesis by the liver. The changes in carnitine metabolism in SHR appear to occur between 5 and 10 wk of age, because the carnitine levels in serum and organs were comparable in 5-wk-old WKy and SHR. The observed alterations in tissue and serum carnitine levels may result in altered fatty acid utilization in SHR.

Original languageEnglish (US)
Pages (from-to)E183-E186
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume12
Issue number2
StatePublished - Jan 1 1985
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

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