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Related Experiment Videos

Inhibition of TNF-alpha production by pentoxifylline does not prevent endotoxin-induced decrease in serum IGF-I.

A Colson1, B Willems, J-P Thissen

  • 1Unité de Diabétologie et Nutrition, Université Catholique de Louvain, B-1200 Bruxelles, Belgium.

The Journal of Endocrinology
|July 8, 2003
PubMed
Summary
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Pentoxifylline inhibits tumor necrosis factor-alpha (TNF-alpha) but does not prevent growth hormone (GH) resistance or insulin-like growth factor-I (IGF-I) decline in sepsis. The drug

Area of Science:

  • Endocrinology
  • Immunology
  • Pharmacology

Background:

  • Sepsis and lipopolysaccharide (LPS) trigger growth hormone (GH) resistance, reducing insulin-like growth factor-I (IGF-I) levels.
  • Proinflammatory cytokines, such as tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta), are implicated in LPS-induced IGF-I reduction.
  • Pentoxifylline, a methylxanthine, is known to inhibit TNF-alpha synthesis.

Purpose of the Study:

  • To investigate if pentoxifylline's inhibition of TNF-alpha production can prevent LPS-induced IGF-I decrease and GH resistance.
  • To determine if pentoxifylline's anticatabolic effect in sepsis is mediated by preventing IGF-I decline.

Main Methods:

  • Rats were injected with LPS to induce sepsis.
  • Animals were pretreated with pentoxifylline.

Related Experiment Videos

  • Serum and liver levels of IGF-I, TNF-alpha, and IL-1beta were measured.
  • GH resistance was assessed.

    • Main Results:

    • LPS injection significantly decreased serum and liver IGF-I mRNA and increased TNF-alpha and IL-1beta.
    • Pentoxifylline pretreatment effectively inhibited LPS-induced TNF-alpha rise and partially reduced IL-1beta increase.
    • Despite TNF-alpha inhibition, pentoxifylline did not prevent the decrease in IGF-I or the development of GH resistance.
    • Pentoxifylline's anticatabolic effect was not linked to maintaining IGF-I levels.

    Conclusions:

    • TNF-alpha is not the primary mediator of LPS-induced GH resistance and IGF-I decline.
    • Other cytokines, like IL-1beta or IL-6, may play a significant role in sepsis-induced GH resistance.
    • Pentoxifylline's beneficial effects in sepsis are not achieved by preserving circulating IGF-I levels.