Our long-term research goal is to understand how striated muscle adapts its molecular composition in response to altered physiological demand. This project explores the link between mechanical work, intracellular signals and local control of protein synthesis. The overall hypothesis is that mechanical strain is a primary physiological signal that controls translation and regional protein synthesis.
Specific Aim 1. To show how mechanical load regulates translation by modulation of the interaction between the 3'UTR of alpha-MyHC mRNA and mRNA binding proteins. We expect to find that mechanical activity triggers a specific intracellular signaling pathway. We propose that phosphorylation of specific mRBFs modulates their binding to a specific cis-sequence on the alpha-MyHC 3'UTR, thus controlling translation.
Specific Aim 2. To show that mechanical load regulates localization via the 3'UTR of alpha-MyHC mRNA leading to local protein synthesis. We expect to find that the direction of mechanical strain influences the direction of growth of the muscle cell with the longitudinal strain producing mRNA localization at the ends of the cells while transverse stain produces inter-myofibrillar localization. We expect that this spatial distribution is governed by the 3'UTR. Control of cell remodeling is important for increasing the mechanical output of the heart that can be a healthy response in exercise or pathological in heart failure.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
2R01HL040880-11
Application #
2762456
Study Section
Special Emphasis Panel (ZRG4-HEM-1 (03))
Project Start
1988-10-01
Project End
2002-12-31
Budget Start
1999-01-11
Budget End
1999-12-31
Support Year
11
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of Illinois at Chicago
Department
Physiology
Type
Schools of Medicine
DUNS #
121911077
City
Chicago
State
IL
Country
United States
Zip Code
60612
Motlagh, Delara; Alden, Kris J; Russell, Brenda et al. (2002) Sodium current modulation by a tubulin/GTP coupled process in rat neonatal cardiac myocytes. J Physiol 540:93-103
Heidkamp, M C; Russell, B (2001) Calcium not strain regulates localization of alpha-myosin heavy chain mRNA in oriented cardiac myocytes. Cell Tissue Res 305:121-7
Ashley Jr, W W; Russell, B (2000) Tenotomy decreases reporter protein synthesis via the 3'-untranslated region of the beta-myosin heavy chain mRNA. Am J Physiol Cell Physiol 279:C257-65
Nikcevic, G; Perhonen, M; Boateng, S Y et al. (2000) Translation is regulated via the 3' untranslated region of alpha-myosin heavy chain mRNA by calcium but not by its localization. J Muscle Res Cell Motil 21:599-607
Russell, B; Motlagh, D; Ashley, W W (2000) Form follows function: how muscle shape is regulated by work. J Appl Physiol 88:1127-32
Nikcevic, G; Heidkamp, M C; Perhonen, M et al. (1999) Mechanical activity in heart regulates translation of alpha-myosin heavy chain mRNA but not its localization. Am J Physiol 276:H2013-9
Heidkamp, M C; Leong, F C; Brubaker, L et al. (1998) Pudendal denervation affects the structure and function of the striated, urethral sphincter in female rats. Int Urogynecol J Pelvic Floor Dysfunct 9:88-93
Perhonen, M; Sharp, W W; Russell, B (1998) Microtubules are needed for dispersal of alpha-myosin heavy chain mRNA in rat neonatal cardiac myocytes. J Mol Cell Cardiol 30:1713-22
Goldspink, P; Sharp, W; Russell, B (1997) Localization of cardiac (alpha)-myosin heavy chain mRNA is regulated by its 3' untranslated region via mechanical activity and translational block. J Cell Sci 110 ( Pt 23):2969-78
Russell, B; Baumann, M; Heidkamp, M C et al. (1996) Morphometry of the aging female rat urethra. Int Urogynecol J Pelvic Floor Dysfunct 7:30-6

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