One of the first recognizable steps during embryonic muscle development is the initiation of desmin expression in replicating presumptive myoblasts proceeding the expression of the myogenic regulator myoD and possibly myogenin. Terminal differentiation of skeletal muscle is associated with down regulation of vimentin and up regulation of desmin. We do not know the biological function of these two immediate filament proteins during these processes. The goal of the proposal is to use different approaches to study the function of desmin and vimentin during early and terminal muscle differentiation. Our data so far has linked overexpression of vimentin and inhibited differentiation. C2 myoblasts transfected with oncogenic ras genes fail to appropriately down regulate vimentin and up regulate desmin. We wish to address the association of this phenomenon with the inability of these cells to differentiate. The following lines of investigation are employed: The recently isolated and fully or partially characterized mouse desmin an vimentin cDNAs and gene will be used to manipulate the expression of vimentin and desmin during in vitro and in vivo myogenesis. Specifically, constructs designed to express a) high levels of vimentin or desmin at the wrong stages during myogenesis, b) high levels of antisense RNA that would inhibit mRMA accumulation and translation, or c) high levels of truncated polypeptides that will disrupt normal filament assembly are introduced into both myogenic cells and transgenic mice. This will allow us to study: a) any possible dependence of the expression of vimentin and desmin upon each other; b) any effect of these proteins on the expression or function of other muscle specific genes; and c) the functional consequences of such forced or inhibited expression on muscle differentiation. Alternatively, gene targeting constructs will be made to be used in homologous recombination experiments designed to disrupt the desmin gene and consequently study directly its functional role during early and late muscle development. For this purpose, further characterization of this mouse desmin gene will be performed and its precise expression during embryogenesis will be assessed by in situ hybridization. We also want to address the significance of the similarities that vimentin and desmin have recently shown to share with some growth (fos, jun) and myogenic (myoD, myogenin) transcription regulators, respectively, by investigating: a) possible association with these molecules, b) involvement in their transport, and c) modulation of their function.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
2R01AR039617-04
Application #
3159794
Study Section
Cellular Biology and Physiology Subcommittee 1 (CBY)
Project Start
1988-07-15
Project End
1996-06-30
Budget Start
1991-07-12
Budget End
1992-06-30
Support Year
4
Fiscal Year
1991
Total Cost
Indirect Cost
Name
Baylor College of Medicine
Department
Type
Schools of Medicine
DUNS #
074615394
City
Houston
State
TX
Country
United States
Zip Code
77030
Diokmetzidou, Antigoni; Soumaka, Elisavet; Kloukina, Ismini et al. (2016) Desmin and ?B-crystallin interplay in the maintenance of mitochondrial homeostasis and cardiomyocyte survival. J Cell Sci 129:3705-3720
Capetanaki, Yassemi; Papathanasiou, Stamatis; Diokmetzidou, Antigoni et al. (2015) Desmin related disease: a matter of cell survival failure. Curr Opin Cell Biol 32:113-20
Tsoupri, Elsa; Capetanaki, Yassemi (2013) ?yospryn: a multifunctional desmin-associated protein. Histochem Cell Biol 140:55-63
Capetanaki, Yassemi; Bloch, Robert J; Kouloumenta, Asimina et al. (2007) Muscle intermediate filaments and their links to membranes and membranous organelles. Exp Cell Res 313:2063-76
Ralston, E; Lu, Z; Biscocho, N et al. (2006) Blood vessels and desmin control the positioning of nuclei in skeletal muscle fibers. J Cell Physiol 209:874-82
Fountoulakis, Michael; Soumaka, Elisavet; Rapti, Kleopatra et al. (2005) Alterations in the heart mitochondrial proteome in a desmin null heart failure model. J Mol Cell Cardiol 38:461-74
Weisleder, Noah; Taffet, George E; Capetanaki, Yassemi (2004) Bcl-2 overexpression corrects mitochondrial defects and ameliorates inherited desmin null cardiomyopathy. Proc Natl Acad Sci U S A 101:769-74
Weisleder, Noah; Soumaka, Elisavet; Abbasi, Shahrzad et al. (2004) Cardiomyocyte-specific desmin rescue of desmin null cardiomyopathy excludes vascular involvement. J Mol Cell Cardiol 36:121-8
Capetanaki, Yassemi (2002) Desmin cytoskeleton: a potential regulator of muscle mitochondrial behavior and function. Trends Cardiovasc Med 12:339-48
Mavroidis, Manolis; Capetanaki, Yassemi (2002) Extensive induction of important mediators of fibrosis and dystrophic calcification in desmin-deficient cardiomyopathy. Am J Pathol 160:943-52

Showing the most recent 10 out of 28 publications