Chronic Norepinephrine Exposure and Whole Blood Detection in Fetal Sheep

Persistent Link:
http://hdl.handle.net/10150/244482
Title:
Chronic Norepinephrine Exposure and Whole Blood Detection in Fetal Sheep
Author:
Najam, Aishah
Issue Date:
May-2012
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Placenta insufficiency results in decreased nutrient supply between the mother and fetus, which induces hypoxemia and hypoglycemia in the fetuses causing intrauterine growth restriction. The fetus increases circulating norepinephrine concentrations in response to this stress, which can cause adrenergic receptor desensitization. The aim of this study was to determine what adrenergic receptors were detectable in fetal whole blood mRNA and to determine whether tissue desensitization manifested in the form of low adrenergic receptor mRNA concentrations. Three of the nine adrenergic receptor subtypes (α2A, β1 and β2) were detectable in RNA extracted from fetal whole blood of control and placenta insufficient treatment groups. Of these three, adrenergic receptor α2A was expressed in the greatest concentration and was chosen for further study. In placenta insufficient fetuses adrenergic receptor α2A mRNA concentrations were 73% lower than the control group. We also measured adrenergic receptor α2A mRNA in fetuses without an adrenal medulla, which were not responsive to hypoxemia-induced elevation of norepinephrine. These placental insufficient fetuses were no different from the controls and therefore, the evidence supports the increase of norepinephrine, rather than the hypoxic conditions, as the cause of desensitization in whole blood samples.
Type:
text; Electronic Thesis
Degree Name:
B.S.H.S.
Degree Level:
bachelors
Degree Program:
Honors College; Physiology
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleChronic Norepinephrine Exposure and Whole Blood Detection in Fetal Sheepen_US
dc.creatorNajam, Aishahen_US
dc.contributor.authorNajam, Aishahen_US
dc.date.issued2012-05-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractPlacenta insufficiency results in decreased nutrient supply between the mother and fetus, which induces hypoxemia and hypoglycemia in the fetuses causing intrauterine growth restriction. The fetus increases circulating norepinephrine concentrations in response to this stress, which can cause adrenergic receptor desensitization. The aim of this study was to determine what adrenergic receptors were detectable in fetal whole blood mRNA and to determine whether tissue desensitization manifested in the form of low adrenergic receptor mRNA concentrations. Three of the nine adrenergic receptor subtypes (α2A, β1 and β2) were detectable in RNA extracted from fetal whole blood of control and placenta insufficient treatment groups. Of these three, adrenergic receptor α2A was expressed in the greatest concentration and was chosen for further study. In placenta insufficient fetuses adrenergic receptor α2A mRNA concentrations were 73% lower than the control group. We also measured adrenergic receptor α2A mRNA in fetuses without an adrenal medulla, which were not responsive to hypoxemia-induced elevation of norepinephrine. These placental insufficient fetuses were no different from the controls and therefore, the evidence supports the increase of norepinephrine, rather than the hypoxic conditions, as the cause of desensitization in whole blood samples.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
thesis.degree.nameB.S.H.S.en_US
thesis.degree.levelbachelorsen_US
thesis.degree.disciplineHonors Collegeen_US
thesis.degree.disciplinePhysiologyen_US
thesis.degree.grantorUniversity of Arizonaen_US
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