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J. Biol. Chem., Vol. 276, Issue 21, 18257-18264, May 25, 2001
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From the Departament de Bioquímica i Biologia Molecular,
Facultat de Biologia, and the § Unitat de Bioquímica
i Biologia Molecular, Departament de Ciències Fisiològiques
I, Facultat de Medicina, Universitat de Barcelona, E-08028 Barcelona,
Spain
Neuregulins regulate the expression
of acetylcholine receptor genes and induce development of the
neuromuscular junction in muscle. In studying whether
neuregulins regulate glucose uptake in muscle, we analyzed the effect
of a recombinant neuregulin, rheregulin-
A Novel Role of Neuregulin in Skeletal Muscle
NEUREGULIN STIMULATES GLUCOSE UPTAKE, GLUCOSE TRANSPORTER
TRANSLOCATION, AND TRANSPORTER EXPRESSION IN MUSCLE CELLS*
,
1-(177-244) (HRG), on L6E9 muscle
cells, which express the neuregulin receptors ErbB2 and ErbB3. L6E9
responded acutely to HRG by a time- and
concentration-dependent stimulation of 2-deoxyglucose uptake. HRG-induced stimulation of glucose transport was additive to
the effect of insulin. The acute stimulation of the glucose transport
induced by HRG was a consequence of the translocation of GLUT4, GLUT1,
and GLUT3 glucose carriers to the cell surface. The effect of HRG on
glucose transport was dependent on phosphatidylinositol 3-kinase
activity. HRG also stimulated glucose transport in the incubated soleus
muscle and was additive to the effect of insulin. Chronic exposure of
L6E9 cells to HRG potentiated myogenic differentiation, and under these
conditions, glucose transport was also stimulated. The activation of
glucose transport after chronic HRG exposure was due to enhanced cell
content of GLUT1 and GLUT3 and to increased abundance of these carriers
at the plasma membrane. However, under these conditions, GLUT4
expression was markedly down-regulated. Muscle denervation is
associated with GLUT1 induction and GLUT4 repression. In this
connection, muscle denervation caused a marked increase in the content
of ErbB2 and ErbB3 receptors, which occurred in the absence of
alterations in neuregulin mRNA levels. This fact suggests
that neuregulins regulate glucose transporter expression in denervated
muscle. We conclude that neuregulins regulate glucose uptake in L6E9
muscle cells by mechanisms involving the recruitment of glucose
transporters to the cell surface and modulation of their expression.
Neuregulins may also participate in the adaptations in glucose
transport that take place in the muscle fiber after denervation.
*
This work was supported by research grants from the
Dirección General de Investigación Científica y
Técnica (PM98/0197), the Generalitat de Catalunya
(1999SGR00039), the Fondo de Investigaciones Sanitarias (00/2101), and
the Fundació Marató de TV3 (991110).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Recipient of a pre-doctoral fellowship from the Universitat de
Barcelona, Spain.
¶
To whom correspondence may be addressed: Dept.
Bioquímica i Biologia Molecular, Facultat de Biologia,
Universitat de Barcelona, Avda. Diagonal, 645, E-08028 Barcelona,
Spain. Tel.: 34-93-402-1519; Fax: 34-93-402-1559; E-mail:
azorzano@porthos.bio.ub.es or aguma@ porthos.bio.ub.es.
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