Sepsis-induced suppression of skeletal muscle translation initiation mediated by tumor necrosis factor α

Charles H. Lang, Robert A. Frost

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Inhibition of translational efficiency is responsible at least in part for the sepsis-induced decrease in protein synthesis observed in skeletal muscle. Moreover, infusion of the inflammatory cytokine tumor necrosis factor α (TNF-α) into naive rats produces a comparable decrement. Therefore, the purpose of the present study was to determine whether inhibition of TNF action under in vivo conditions could prevent the sepsis-induced decrease in translation initiation observed in the postabsorptive state. To address this aim, sepsis was produced by cecal ligation and puncture (CLP) and rats were studied in the fasted condition 20 to 24 hours thereafter. Both septic and time-matched nonseptic control rats were pretreated with TNF-binding protein (TNFBP) before CLP or sham surgery to neutralize endogenously produced TNF. Sepsis altered the distribution of eukaryotic initiation factor 4E (eIF4E) in the gastrocnemius by increasing the amount associated with 4E-BP1 (inactive complex) and decreasing the amount bound to eIF4G (active complex). This change in eIF4E availability was associated with a decreased phosphorylation of 4E-BP1. Furthermore, the phosphorylation of ribosomal protein S6 and mammalian target of rapamycin (mTOR) was also decreased in the gastrocnemius from septic rats. Pretreatment of septic rats with TNFBP largely ameliorated the altered distribution of eIF4E as well as the reduced phosphorylation of 4E-BP1, S6, and mTOR. In contrast, sepsis did not change either the total amount or the phosphorylation state of eIF2α or eIF2Bε. Furthermore, no sepsis-induced change in eIFs was detected in the slow-twitch soleus muscle. The ability of TNFBP to prevent the sepsis-induced alterations in translation initiation was independent of change in plasma insulin and proportional to the insulinlike growth factor I content in blood and muscle but was associated with a reduction in plasma corticosterone. Hence, the decreased constitutive protein synthesis observed in fast-twitch skeletal muscle in response to peritonitis is mediated by a TNF-dependent mechanism affecting mTOR regulation of translation initiation.

Original languageEnglish (US)
Pages (from-to)49-57
Number of pages9
JournalMetabolism: Clinical and Experimental
Volume56
Issue number1
DOIs
StatePublished - Jan 1 2007

Fingerprint

Sepsis
Skeletal Muscle
Tumor Necrosis Factor-alpha
Eukaryotic Initiation Factor-4E
Sirolimus
Phosphorylation
Carrier Proteins
Punctures
Ligation
Ribosomal Protein S6
S 6
Corticosterone
Peritonitis
Intercellular Signaling Peptides and Proteins
Proteins
Insulin
Cytokines
Muscles

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

Cite this

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title = "Sepsis-induced suppression of skeletal muscle translation initiation mediated by tumor necrosis factor α",
abstract = "Inhibition of translational efficiency is responsible at least in part for the sepsis-induced decrease in protein synthesis observed in skeletal muscle. Moreover, infusion of the inflammatory cytokine tumor necrosis factor α (TNF-α) into naive rats produces a comparable decrement. Therefore, the purpose of the present study was to determine whether inhibition of TNF action under in vivo conditions could prevent the sepsis-induced decrease in translation initiation observed in the postabsorptive state. To address this aim, sepsis was produced by cecal ligation and puncture (CLP) and rats were studied in the fasted condition 20 to 24 hours thereafter. Both septic and time-matched nonseptic control rats were pretreated with TNF-binding protein (TNFBP) before CLP or sham surgery to neutralize endogenously produced TNF. Sepsis altered the distribution of eukaryotic initiation factor 4E (eIF4E) in the gastrocnemius by increasing the amount associated with 4E-BP1 (inactive complex) and decreasing the amount bound to eIF4G (active complex). This change in eIF4E availability was associated with a decreased phosphorylation of 4E-BP1. Furthermore, the phosphorylation of ribosomal protein S6 and mammalian target of rapamycin (mTOR) was also decreased in the gastrocnemius from septic rats. Pretreatment of septic rats with TNFBP largely ameliorated the altered distribution of eIF4E as well as the reduced phosphorylation of 4E-BP1, S6, and mTOR. In contrast, sepsis did not change either the total amount or the phosphorylation state of eIF2α or eIF2Bε. Furthermore, no sepsis-induced change in eIFs was detected in the slow-twitch soleus muscle. The ability of TNFBP to prevent the sepsis-induced alterations in translation initiation was independent of change in plasma insulin and proportional to the insulinlike growth factor I content in blood and muscle but was associated with a reduction in plasma corticosterone. Hence, the decreased constitutive protein synthesis observed in fast-twitch skeletal muscle in response to peritonitis is mediated by a TNF-dependent mechanism affecting mTOR regulation of translation initiation.",
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Sepsis-induced suppression of skeletal muscle translation initiation mediated by tumor necrosis factor α. / Lang, Charles H.; Frost, Robert A.

In: Metabolism: Clinical and Experimental, Vol. 56, No. 1, 01.01.2007, p. 49-57.

Research output: Contribution to journalArticle

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AB - Inhibition of translational efficiency is responsible at least in part for the sepsis-induced decrease in protein synthesis observed in skeletal muscle. Moreover, infusion of the inflammatory cytokine tumor necrosis factor α (TNF-α) into naive rats produces a comparable decrement. Therefore, the purpose of the present study was to determine whether inhibition of TNF action under in vivo conditions could prevent the sepsis-induced decrease in translation initiation observed in the postabsorptive state. To address this aim, sepsis was produced by cecal ligation and puncture (CLP) and rats were studied in the fasted condition 20 to 24 hours thereafter. Both septic and time-matched nonseptic control rats were pretreated with TNF-binding protein (TNFBP) before CLP or sham surgery to neutralize endogenously produced TNF. Sepsis altered the distribution of eukaryotic initiation factor 4E (eIF4E) in the gastrocnemius by increasing the amount associated with 4E-BP1 (inactive complex) and decreasing the amount bound to eIF4G (active complex). This change in eIF4E availability was associated with a decreased phosphorylation of 4E-BP1. Furthermore, the phosphorylation of ribosomal protein S6 and mammalian target of rapamycin (mTOR) was also decreased in the gastrocnemius from septic rats. Pretreatment of septic rats with TNFBP largely ameliorated the altered distribution of eIF4E as well as the reduced phosphorylation of 4E-BP1, S6, and mTOR. In contrast, sepsis did not change either the total amount or the phosphorylation state of eIF2α or eIF2Bε. Furthermore, no sepsis-induced change in eIFs was detected in the slow-twitch soleus muscle. The ability of TNFBP to prevent the sepsis-induced alterations in translation initiation was independent of change in plasma insulin and proportional to the insulinlike growth factor I content in blood and muscle but was associated with a reduction in plasma corticosterone. Hence, the decreased constitutive protein synthesis observed in fast-twitch skeletal muscle in response to peritonitis is mediated by a TNF-dependent mechanism affecting mTOR regulation of translation initiation.

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