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Chronic Stress Effects on Adrenal Cortex Cellular Proliferation in Pregnant Rats International Journal of Morphology
Bozzo,Aída Andrea; Soñez,Carlos Alberto; Monedero Cobeta,Ignacio; Avila,Rodolfo; Rolando,Alicia Nélida; Romanini,María Cristina; Lazarte,Mario; Gauna,Héctor Fernando; Mugnaini,María Teresa.
Chronic stress by immobilization during pregnancy may cause alterations in mechanisms maintaining homeostasis in the adrenal gland. The objective of this study was to quantify cellular proliferation index in the adrenal cortex during pregnancy second half and assess the effects of chronic stress on it. Adrenal cortex proliferation index in stressed rats showed a significant decrease at 12 and 17 days of gestation, while at day 21 it did not show differences with the control treatments. Moreover, proliferation index of reticular zones in control and experimental rats, exhibited a significant reduction in comparison to glomerular and fascicular zones of adrenal cortex during the three gestation days studied. In conclusion, chronic stress by immobilization...
Tipo: Journal article Palavras-chave: Chronic stress; Cellular proliferation; Adrenal cortex; Pregnancy.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400013
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Chronic Stress Effects on NPY Neuronal Population During Rat Development International Journal of Morphology
Buljubacich,Karina Alejandra; Mugnaini,María Teresa; Soñez,Carlos Alberto; Rolando,Alicia Nélida; Romanini,María Cristina; Bozzo,Aída Andrea; Soñez,María Cristina; Gauna,Héctor Fernando.
The aim of this work was to determine the chronical stress effects on the encephalic NPY neurons population during the fetal Central nervous system development. Immunocytochemical techniques were used for this purpose: NPY neurons presented a similar morphology during the gestation days studied but their distribution varied in the anterior, medium and posterior brain. Statistical Highly significant differences in number of NPY positive neurons (p<0.01) among anterior, medium and posterior brain of stressed fetus (SF) were determined depending on the gestation period and the brain area. The NPY neurons were increased in ARC (Arcuate Hypothalamic Nucleus), PH (Posterior Hypothalamic Area) and DM (Dorsomedial Hypothalamic Nucleus) in stressed fetuses (SF)...
Tipo: Journal article Palavras-chave: NPY; Prenatal chronical stress; CNS; Rats.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300039
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Chronic stress effects on the apoptotic index of the adrenal cortex of pregnant rats Biocell
Bozzo,Andrea; Soñez,Carlos Alberto; Mugnaini,María Teresa; Pastorino,Isabel Cecilia; Rolando,Alicia Nélida; Romanini,María Cristina; Gauna,Héctor Fernando.
Chronic stress by immobilization during gestation can alter several mechanisms that maintain homeostasis in adrenal gland. The aim of this work was to quantify the apoptotic index of adrenal cortex during mid-pregnancy and to prove cytological characteristics by electron microscopy. The apoptotic index did not present significant differences between the adrenal cortex areas of control and experimental rats in any of the three ages studied. The day of gestation influenced significantly on the apoptotic index in both groups. This index increased as gestation progressed. It may be concluded that chronic stress by immobilization might induce the increase of apoptotic index in adrenal cortex as gestation progresses which might be related variations of plasmatic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chronic stress; Apoptosis; Adrenal cortex; Pregnancy.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000300004
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Maternal Chronic Stress Induces Premature Telencephalic Vesicles Development International Journal of Morphology
Mugnaini,María Teresa; Soñez,Carlos Alberto; Rolando,Alicia Nélida; Romanini,María Cristina; Bozzo,Aída Andrea; Pastorino,Isabel Cecilia; Gauna,Héctor Fernando; Paz,Dante Agustín.
Exposure to physical or psychological stress causes brain damage ranging from minimal behavioural alterations to different neurodegeneration degrees implying the overproduction of oxidative-nitrosative compounds, apoptosis and cell proliferation. In the present investigation, we have analysed the effect of the chronic stress by immobilisation applied to pregnant rats over the forebrain development of the embryos. The morphometric analyses showed an accelerated evagination of the telencephalic vesicles in 12 days old fetus from stressed mothers. The forebrain perimeter and the thickness showed significative differences in relation to age-matched controls. This stress effect seemed reversible during subsequent gestational stages. This is the first work...
Tipo: Journal article Palavras-chave: Telencephalic vesicle; Chronic stress; Morphometric analysis; Rats.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500001
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