Acute phase response in exercise. II. Associations between vitamin E, cytokines, and muscle proteolysis.

Published

Journal Article

Cytokines such as interleukin 1 (IL-1), tumor necrosis factor-alpha (TNF-alpha), and interleukin 6 (IL-6) mediate a variety of host responses to trauma and infection, including skeletal muscle proteolysis. This investigation assesses the influence of damaging eccentric exercise on in vitro production and plasma concentrations of cytokines and their relationship to muscle protein breakdown. In a double-blind placebo-controlled protocol, 21 male subjects took vitamin E supplements (800 IU/day) for 48 days, then ran downhill on an inclined treadmill. Twenty-four hours after this single session of eccentric exercise, endotoxin-induced secretion of IL-1 beta was augmented 154% (P less than 0.01) in cells obtained from the placebo subjects, but no significant exercise-related changes were observed in cells from the vitamin E-supplemented subjects. TNF-alpha secretion was also significantly increased 24 h after exercise, but the response was not inhibited by vitamin E. In contrast, IL-6 secretion did not change after exercise, but dietary vitamin E supplementation significantly reduced IL-6 secretion throughout the 12-day period of observation (P = 0.023). Urinary 3-methylhistidine excretion correlated with mononuclear cell secretion of both IL-1 beta (P less than 0.05) and prostaglandin E2 (P less than 0.05), supporting the concept that these mononuclear cell products contribute to the regulation of muscle proteolysis.

Full Text

Duke Authors

Cited Authors

  • Cannon, JG; Meydani, SN; Fielding, RA; Fiatarone, MA; Meydani, M; Farhangmehr, M; Orencole, SF; Blumberg, JB; Evans, WJ

Published Date

  • June 1991

Published In

Volume / Issue

  • 260 / 6 Pt 2

Start / End Page

  • R1235 - R1240

PubMed ID

  • 1905495

Pubmed Central ID

  • 1905495

International Standard Serial Number (ISSN)

  • 0002-9513

Digital Object Identifier (DOI)

  • 10.1152/ajpregu.1991.260.6.R1235

Language

  • eng

Conference Location

  • United States