Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle

Jiri Turinsky, G. William Nagel, Jeffrey Elmendorf, Alice Damrau-Abney, Terry R. Smith

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The effects of sphingomyelinase, phosphorylcholine, N-acetyl-sphingosine (C2-ceramide), N-hexanoylsphingosine (C6-ceramide) and sphingosine on basal and insulin-stimulated cellular accumulation of 2-deoxy-D-glucose in rat soleus muscles were investigated. Preincubation of muscles with sphingomyelinase (100 or 200 m-units/ml) for 1 or 2 h augmented basal 2-deoxyglucose uptake by 29-91%, and that at 0.1 and 1.0 m-unit of insulin/ml by 32-82% and 19-25% respectively compared with control muscles studied at the same insulin concentrations. The sphingomyelinase-induced increase in basal and insulin-stimulated 2-deoxyglucose uptake was inhibited by 91% by 70 μM cytochalasin B, suggesting that it involves glucose transporters. Sphingomyelinase had no effect on the cellular accumulation of L-glucose, which is not transported by glucose transporters. The sphingomyelinase-induced increase in 2-deoxyglucose uptake could not be reproduced by preincubating the muscles with 50 μM phosphorylcholine, 50 μM C2-ceramide or 50 μM CB-ceramide. Preincubation of muscles with 50 μM sphingosine augmented basal 2-deoxyglucose transport by 32%, but reduced the response to 0.1 and 1.0 m-unit of insulin/ml by 17 and 27% respectively. The stimulatory effect of sphingomyelinase on basal and insulin-induced 2-deoxyglucose uptake was not influenced by either removal of Ca2+ from the incubation medium or dantrolene, an inhibitor of Ca2+ release from the sarcoplasmic reticulum. This demonstrates that Ca2+ does not mediate the action of sphingomyelinase on 2-deoxyglucose uptake. Sphingomyelinase also had no effect on basal and insulin-stimulated activities of insulin receptor tyrosine kinase and phosphatidylinositol 3-kinase. In addition, 1 and 5μM wortmannin, an inhibitor of phosphatidylinositol 3-kinase, failed to inhibit the sphingomyelinase-induced increase in 2-deoxyglucose uptake. These results suggest that sphingomyelinase does not increase 2-deoxyglucose uptake by stimulating the insulin receptor or the initial steps of the insulin-transduction pathway. The data suggest the possibility that sphingomyelinase increases basal and insulin-stimulated 2-deoxyglucose uptake in skeletal muscle as the result of an unknown post-receptor effect.

Original languageEnglish (US)
Pages (from-to)215-222
Number of pages8
JournalBiochemical Journal
Volume313
Issue number1
StatePublished - Jan 1 1996
Externally publishedYes

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Sphingomyelin Phosphodiesterase
Deoxyglucose
Muscle
Skeletal Muscle
Insulin
Sphingosine
Phosphatidylinositol 3-Kinase
Muscles
Phosphorylcholine
Facilitative Glucose Transport Proteins
Dantrolene
Cytochalasin B
Ceramides
Insulin Receptor
Sarcoplasmic Reticulum
Rats

ASJC Scopus subject areas

  • Biochemistry

Cite this

Turinsky, J., Nagel, G. W., Elmendorf, J., Damrau-Abney, A., & Smith, T. R. (1996). Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle. Biochemical Journal, 313(1), 215-222.

Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle. / Turinsky, Jiri; Nagel, G. William; Elmendorf, Jeffrey; Damrau-Abney, Alice; Smith, Terry R.

In: Biochemical Journal, Vol. 313, No. 1, 01.01.1996, p. 215-222.

Research output: Contribution to journalArticle

Turinsky, J, Nagel, GW, Elmendorf, J, Damrau-Abney, A & Smith, TR 1996, 'Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle', Biochemical Journal, vol. 313, no. 1, pp. 215-222.
Turinsky J, Nagel GW, Elmendorf J, Damrau-Abney A, Smith TR. Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle. Biochemical Journal. 1996 Jan 1;313(1):215-222.
Turinsky, Jiri ; Nagel, G. William ; Elmendorf, Jeffrey ; Damrau-Abney, Alice ; Smith, Terry R. / Sphingomyelinase stimulates 2-deoxyglucose uptake by skeletal muscle. In: Biochemical Journal. 1996 ; Vol. 313, No. 1. pp. 215-222.
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