The expression of TNFα by human muscle: Relationship to insulin resistance

Mehrnoosh Saghizadeh, John M. Ong, W. Timothy Garvey, Robert R. Henry, Philip A. Kern

Research output: Contribution to journalArticlepeer-review

637 Scopus citations

Abstract

TNFα is overexpressed in the adipose tissue of obese rodents and humans, and is associated with insulin resistance. To more closely link TNF expression with whole body insulin action, we examined the expression of TNF by muscle, which is responsible for the majority of glucose uptake in vivo. Using RT-PCR, TNF was detected in human heart, in skeletal muscle from humans and rats, and in cultured human myocytes. Using competitive RT-PCR, TNF was quantitated in the muscle biopsy specimens from 15 subjects whose insulin sensitivity had been characterized using the glucose clamp technique. TNF expression in the insulin resistant subjects and the diabetic patients was fourfold higher than in the insulin sensitive subjects, and there was a significant inverse linear relationship between maximal glucose disposal rate and muscle TNF (r = -0.60, P < 0.02). In nine subjects, muscle cells from vastus lateralis muscle biopsies were placed into tissue culture for 4 wk, and induced to differentiate into myotubes. TNF was secreted into the medium from these cells, and cells from diabetic patients expressed threefold more TNF than cells from non-diabetic subjects. Thus, TNF is expressed in human muscle, and is expressed at a higher level in the muscle tissue and in the cultured muscle cells from insulin resistant and diabetic subjects. These data suggest another mechanism by which TNF may play an important role in human insulin resistance.

Original languageEnglish
Pages (from-to)1111-1116
Number of pages6
JournalJournal of Clinical Investigation
Volume97
Issue number4
DOIs
StatePublished - Feb 15 1996

Keywords

  • insulin resistance
  • non-insulin-dependent diabetes mellitus
  • obesity
  • quantitative reverse transcriptase polymerase chain reaction (RT-PCR)
  • tumor necrosis factor

ASJC Scopus subject areas

  • Medicine (all)

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