Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes.

Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Research Abstract Details 

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Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Abstract Text:

Samantha Louey,Sonnet S Jonker,George D Giraud,Kent L Thornburg,

Umbilicoplacental embolization (UPE) in sheep has been used to investigate the effects of placental insufficiency on fetal development. However, its specific effects on the heart have been little studied. The aim of this study was to determine the effects of placental insufficiency, induced by UPE, on cardiomyocyte size, maturation and proliferation. Instrumented fetal sheep underwent UPE for either 10 or 20 days. Hearts were collected at 125 +/- 1 days (10 day group) or 136 +/- 1 days (20 day group) of gestation (term approximately 145 days). Cell size, maturational state (as measured by the proportion of binucleated myocytes) and cell cycle activity (as measured by positive staining of cells for Ki-67) were determined in dissociated cardiomyocytes. UPE fetuses were hypoxaemic, but mean arterial pressures were not different from controls. UPE fetuses were lighter than control fetuses (10 days: -21%, P < 0.05; 20 days: -27%, P < 0.01) and had smaller hearts, but heart weight was appropriate for body weight. Neither lengths nor widths were different between control and UPE cardiomyocytes at either age. Ten days of UPE did not significantly alter the proportion of binucleated myocytes or cell cycle activity in either ventricle. However, 20 days of UPE reduced cell cycle activity in both ventricles by approximately 70% (P < 0.05); the proportion of binucleated myocytes was also lower in UPE fetuses at this age (left ventricle: 31.1 +/- 12.0 versus 46.0 +/- 6.6%, P < 0.05; right ventricle: 29.4 +/- 12.3 versus 46.3 +/- 5.3%, P < 0.05). It is concluded that in the absence of fetal arterial hypertension, placental insufficiency is associated with substantially depressed growth of the heart through suppressed proliferation and maturation of cardiomyocytes.

Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Publishing Authors By Initials

S Louey,SS Jonker,GD Giraud,KL Thornburg,

For similar animals: chordata: vertebrates: mammals: artiodactyla: ruminants: sheep research abstracts see: animals: chordata: vertebrates: mammals: artiodactyla: ruminants: sheep research

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Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Journal of physiology

VOLUME: 580

Page Numbers: 639-48

Journal Abbreviation:

ISSN: 0022-3751

DAY: 18

MONTH: 01

YEAR: 2007

Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Information

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LANGUAGE: eng

NlmUniqueID: 266262

Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes. Keywords Mesh Terms:

KEYWORDS: Sheep

MESH TERMS: physiopathology

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Grant and Affiliation Information for Placental insufficiency decreases cell cycle activity and terminal maturation in fetal sheep cardiomyocytes.

AFFILIATION: Heart Research Center, Oregon Health and Science University, Portland, OR 97239-3098, USA. loueys@ohsu.edu

Country: England

AGENCY: United States NICHD

GRANT: P01HD34430

ACRONYM: HD

MEDLINETA: J Physiol

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