Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Anatomical Record |
| Vol/bind | 268 |
| Udgave nummer | 1 |
| Sider (fra-til) | 38-46 |
| Antal sider | 8 |
| ISSN | 0003-276X |
| DOI | |
| Status | Udgivet - 2002 |
Bibliografisk note
Copyright 2002 Wiley-Liss, Inc.Citationsformater
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I: Anatomical Record, Bind 268, Nr. 1, 2002, s. 38-46.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Localization of the transmembrane proteoglycan syndecan-4 and its regulatory kinases in costameres of rat cardiomyocytes: a deconvolution microscopic study.
AU - VanWinkle, W Barry
AU - Snuggs, Mark B
AU - De Hostos, Eugenio L
AU - Buja, L Maximilian
AU - Woods, Anne
AU - Couchman, John R
N1 - Keywords: Animals; Animals, Newborn; Cell Differentiation; Cell Membrane; Cells, Cultured; Cytoskeleton; Extracellular Matrix; Focal Adhesions; Green Fluorescent Proteins; Immunohistochemistry; Isoenzymes; Luminescent Proteins; Male; Membrane Glycoproteins; Microscopy, Confocal; Muscle Contraction; Myocardium; Myocytes, Cardiac; Myofibrils; Protein Kinase C; Protein Kinase C-epsilon; Protein Structure, Tertiary; Proteoglycans; Proto-Oncogene Proteins pp60(c-src); Rats; Rats, Sprague-Dawley; Signal Transduction; Syndecan-4
PY - 2002
Y1 - 2002
N2 - Syndecan-4 (syn-4), a transmembrane heparan sulfate-containing proteoglycan, is unique among the four members of the syndecan family in its specific cellular localization to complex cytoskeletal adhesion sites, i.e., focal adhesions. During early phenotypic redifferentiation of neonatal cardiomyocytes in culture, immunolocalization reveals syn-4 to be heavily concentrated in the perinuclear endoplasmic reticulum-Golgi region, with little found at the peripheral regions. Subsequently, syn-4 becomes localized to a cytoskeletal adhesion complex unique to striated muscle, the costamere. Soon after redifferentiation of myofibrils in cultured neonatal cardiomyocytes, syn-4 is present only in costameres, not in focal adhesions. In cultured adult cardiomyocytes, it is present in both costameres and focal adhesions-the latter in two distinct regions of the spread cardiomyocytes, reflecting localization with two types of actin-containing filaments. The fact that syn-4 is observed early in the costameric regions, as opposed to later in the focal adhesions, suggests that it may play an initial role in early adhesion/signal transduction mechanisms in close proximity to the contractile apparatus, as well as in transmission of contractile force to the collagenous extracellular matrix (ECM) which surrounds the cardiac myofibers in situ. With respect to possible regulatory mechanisms of syn-4, we localized syn-4 with both the epsilon isoform of protein kinase C and the tyrosine kinase pp60(csrc) in costameric regions. These findings suggest that syn-4 may not only play a role in cellular adhesion and contractile force transmission, it may also, through ser, thr, and tyr phosphorylation, be part of an interactive signal transduction mechanism in myocardial functioning via these adhesive cytoskeletal complexes.
AB - Syndecan-4 (syn-4), a transmembrane heparan sulfate-containing proteoglycan, is unique among the four members of the syndecan family in its specific cellular localization to complex cytoskeletal adhesion sites, i.e., focal adhesions. During early phenotypic redifferentiation of neonatal cardiomyocytes in culture, immunolocalization reveals syn-4 to be heavily concentrated in the perinuclear endoplasmic reticulum-Golgi region, with little found at the peripheral regions. Subsequently, syn-4 becomes localized to a cytoskeletal adhesion complex unique to striated muscle, the costamere. Soon after redifferentiation of myofibrils in cultured neonatal cardiomyocytes, syn-4 is present only in costameres, not in focal adhesions. In cultured adult cardiomyocytes, it is present in both costameres and focal adhesions-the latter in two distinct regions of the spread cardiomyocytes, reflecting localization with two types of actin-containing filaments. The fact that syn-4 is observed early in the costameric regions, as opposed to later in the focal adhesions, suggests that it may play an initial role in early adhesion/signal transduction mechanisms in close proximity to the contractile apparatus, as well as in transmission of contractile force to the collagenous extracellular matrix (ECM) which surrounds the cardiac myofibers in situ. With respect to possible regulatory mechanisms of syn-4, we localized syn-4 with both the epsilon isoform of protein kinase C and the tyrosine kinase pp60(csrc) in costameric regions. These findings suggest that syn-4 may not only play a role in cellular adhesion and contractile force transmission, it may also, through ser, thr, and tyr phosphorylation, be part of an interactive signal transduction mechanism in myocardial functioning via these adhesive cytoskeletal complexes.
U2 - 10.1002/ar.10130
DO - 10.1002/ar.10130
M3 - Journal article
C2 - 12209563
SN - 0003-276X
VL - 268
SP - 38
EP - 46
JO - Anatomical Record
JF - Anatomical Record
IS - 1
ER -