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Integrative Physiology |
From the Myocardial Biology Unit and Cardiovascular Section, Boston Medical Center, Boston Veterans Affairs Medical Center and Boston University School of Medicine (N.A.T., Z.X., C.C., F.S., S.N., J.W., D.B.S., O.H.L.B., C.S.A., W.S.C., K.S.), Boston, Mass; the Maine Medical Research Center (L.L.), South Portland, Maine; and Bates College (A.W.J.), Lewiston, Maine.
Correspondence to Krishna Singh, PhD, Myocardial Biology Unit, 650 Albany St, X-706, Boston, MA 02118. E-mail krishna.singh{at}bmc.org
AbstractOsteopontin
(OPN), an extracellular matrix protein, is expressed in the
myocardium with hypertrophy and failure. We
tested the hypothesis that OPN plays a role in left
ventricular (LV) remodeling after myocardial infarction
(MI). Accordingly, OPN expression and LV structural and functional
remodeling were determined in wild-type (WT) and OPN knockout (KO) mice
4 weeks after MI. Northern analysis showed increased OPN
expression in the infarcted region, peaking 3 days after MI and
gradually decreasing over the next 28 days. In the remote LV, OPN
expression was biphasic, with peaks at 3 and 28 days. In situ
hybridization and immunohistochemical analyses showed increased
OPN mRNA and protein primarily in the interstitium. Infarct size, heart
weight, and survival were similar in KO and WT mice after MI
(P=NS), whereas the lung wet
weight/dry weight ratio was increased in the KO mice
(P<0.005 versus sham-operated
mice). Peak LV developed pressure was reduced to a similar degree after
MI in the KO and WT mice. The number of terminal
deoxynucleotidyl transferasemediated dUTP nick
end-labeling (TUNEL)-positive myocytes was similar in KO and WT mice
after MI. In contrast, post-MI LV chamber dilation was approximately
twice as great in KO versus WT mice
(P<0.001). Myocyte length
increased after MI in WT mice
(P<0.001) but not in KO mice.
Electron microscopy showed increased collagen content in WT mice after
MI but not in KO mice after MI. Type I collagen content was increased
3-fold and
7-fold in remote and infarcted regions, respectively,
of WT hearts after MI but not in KO hearts
(P<0.01 versus WT hearts).
Likewise, Northern analyses showed increased collagen
I(
1) mRNA after MI in remote regions of WT
hearts but not in KO hearts. Thus, increased OPN expression plays an
important role in regulating post-MI LV remodeling, at least in part,
by promoting collagen synthesis and accumulation.
Key Words: extracellular matrix proteins osteopontin collagen myocyte slippage myocyte elongation
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