Characterization of sarcoplasmic reticulum Ca(2+) ATPase pumps in muscle of patients with myotonic dystrophy and with hypothyroid myopathy

Sarcoplasmic/endoplasmic reticulum Ca(2+) ATPase (SERCA) pumps play the major role in lowering cytoplasmic calcium concentration in skeletal muscle by catalyzing the ATP-dependent transport of Ca(2+) from the cytosol to the lumen of the sarcoplasmic reticulum (SR). Although SERCA abnormalities have...

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Bibliographic Details
Published in:Neuromuscular disorders : NMD 2016-06, Vol.26 (6), p.378-385
Main Authors: Guglielmi, V, Oosterhof, A, Voermans, N C, Cardani, R, Molenaar, J P, van Kuppevelt, T H, Meola, G, van Engelen, B G, Tomelleri, G, Vattemi, G
Format: Article
Language:English
Subjects:
Adult
Female
Humans
Hypothyroidism - enzymology
Hypothyroidism - pathology
Isoenzymes
Male
Middle Aged
Muscle, Skeletal - enzymology
Muscle, Skeletal - pathology
Myotonic Dystrophy - enzymology
Myotonic Dystrophy - pathology
Sarcoplasmic Reticulum Calcium-Transporting ATPases - metabolism
Young Adult
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Summary:Sarcoplasmic/endoplasmic reticulum Ca(2+) ATPase (SERCA) pumps play the major role in lowering cytoplasmic calcium concentration in skeletal muscle by catalyzing the ATP-dependent transport of Ca(2+) from the cytosol to the lumen of the sarcoplasmic reticulum (SR). Although SERCA abnormalities have been hypothesized to contribute to the dysregulation of intracellular Ca(2+) homeostasis and signaling in muscle of patients with myotonic dystrophy (DM) and hypothyroid myopathy, the characterization of SERCA pumps remains elusive and their impairment is still unclear. We assessed the activity of SR Ca(2+)-ATPase, expression levels and fiber distribution of SERCA1 and SERCA2, and oligomerization of SERCA1 protein in muscle of patients with DM type 1 and 2, and with hypothyroid myopathy. Our data provide evidence that SR Ca(2+) ATPase activity, protein levels and muscle fiber distribution of total SERCA1 and SERCA2, and SERCA1 oligomerization pattern are similar in patients with both DM1 and DM2, hypothyroid myopathy and in control subjects. We prove that SERCA1b, the neonatal isoform of SERCA1, is expressed at protein level in muscle of patients with DM2 and, in lower amount, of patients with DM1. Our present study demonstrates that SERCA function is not altered in muscle of patients with DM and with hypothyroid myopathy.
ISSN:1873-2364
DOI:10.1016/j.nmd.2016.04.003