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CHOLESTEROL DEPLETION INDUCES TRANSCRIPTIONAL CHANGES DURING SKELETAL MUSCLE DIFFERENTIATION
Author
Affilliation
Universidade Federal do Rio de Janeiro. Instituto de Ciências Biomédicas. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
UNIFESP Baixada Santista. Departamento de Ciências do Mar. São Paulo, SP, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Rio de Janeiro, RJ, Brasil.
niversidade Federal do Rio de Janeiro. Instituto de Ciências Biomédicas. Rio de Janeiro, RJ, Brasil.
niversidade Federal do Rio de Janeiro. Instituto de Ciências Biomédicas. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
UNIFESP Baixada Santista. Departamento de Ciências do Mar. São Paulo, SP, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Rio de Janeiro, RJ, Brasil.
niversidade Federal do Rio de Janeiro. Instituto de Ciências Biomédicas. Rio de Janeiro, RJ, Brasil.
niversidade Federal do Rio de Janeiro. Instituto de Ciências Biomédicas. Rio de Janeiro, RJ, Brasil.
Abstract
Background: Myoblasts undergo major changes in their plasma membrane during the initial steps of skeletal
muscle differentiation, including major alterations in the distribution of cholesterol. Cholesterol is involved in crucial
membrane functions, such as fluidity, and permeability, and in the organization of specialized membrane
microdomains (or lipid rafts). We have previously shown that alterations in cholesterol levels in myoblasts induce
changes in proliferation and differentiation, which involves activation of Wnt/beta-catenin signaling pathway. In this
study we used methyl-β-cyclodextrin (MbCD) to extract cholesterol from the membrane of chick skeletal muscle
cells grown in culture. Using Ion Torrent-based sequencing, we compared the transcriptome of untreated and
MbCD treated cells. Our aim was to define the genes that are expressed in these two conditions and relate their
expression to cellular functions.
Results: Over 5.7 million sequences were obtained, representing 671.38 Mb of information. mRNA transcriptome
profiling of myogenic cells after cholesterol depletion revealed alterations in transcripts involved in the regulation
of apoptosis, focal adhesion, phagosome, tight junction, cell cycle, lysosome, adherens junctions, gap junctions, p53
signaling pathway, endocytosis, autophagy and actin cytoskeleton. Lim domain only protein 7 mRNA was found to
be the highest up-regulated feature after cholesterol depletion.
Conclusions: This is the first study on the effects of membrane cholesterol depletion in mRNA expression in
myogenic cells. Our data shows that alterations in the availability of plasma membrane cholesterol lead to
transcriptional changes in myogenic cells. The knowledge of the genes involved in the cellular response to
cholesterol depletion could contribute to our understanding of skeletal muscle differentiation.
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