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20 records – page 2 of 1.

Regulated expression of aggrecanases of ADAMTS family in endometrial physiology and pathology

https://cwslc.andornot.com/en/permalink/catalog113954
Wen, Jiadi. [Vancouver, BC?]: University of British Columbia , 2010.
Website
http://hdl.handle.net/2429/30478
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The ADAMTS (A Disintegrin and Metalloproteinase with TromboSpondin Repeats) are a novel family of secreted metalloproteinases. There is increasing evidence that distinct ADAMTS subtypes play key roles in embryonic development, reproduction and cancer. Nineteen ADAMTS subtypes have been identified i…
Website
http://hdl.handle.net/2429/30478
Author
Wen, Jiadi
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2010
Subject
Faculty of Medicine
Theses
Abstract
The ADAMTS (A Disintegrin and Metalloproteinase with TromboSpondin Repeats) are a novel family of secreted metalloproteinases. There is increasing evidence that distinct ADAMTS subtypes play key roles in embryonic development, reproduction and cancer. Nineteen ADAMTS subtypes have been identified in humans but most of them have been characterized only at the structural level. ADAMTS-1, -4, -5, -8, -9 and -15 have been subclassified into a subfamily, known as aggrecanases, owing to their ability to cleave the important extracellular matrix components, versican and aggrecan.
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English
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Clinical and endocrine responses to ovarian hyperstimulation in flare and and luteal gonadotropin-releasing hormone agonist (GnRHa) protocols

https://cwslc.andornot.com/en/permalink/catalog113958
Nguyen, Tuan-Anh T. [Vancouver, BC?]: University of British Columbia , 2008.
Website
http://hdl.handle.net/2429/1395
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Due to the ?flare effect? associated with the flare protocol, variation in the degree of follicular maturation during stimulation may result in differences in follicle response as compared to the luteal protocol which is based on maximal pituitary suppression and synchronization of follicular matur…
Website
http://hdl.handle.net/2429/1395
Author
Nguyen, Tuan-Anh T
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2008
Subject
Faculty of Medicine
Theses
Abstract
Due to the ?flare effect? associated with the flare protocol, variation in the degree of follicular maturation during stimulation may result in differences in follicle response as compared to the luteal protocol which is based on maximal pituitary suppression and synchronization of follicular maturation. In this study, besides other methods, Anti-Mullerian Hormone (AMH), a novel marker for ovarian reserve, was used as a tool to evaluate the ovarian responsiveness to stimulation.
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English
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Meiotic defects in infertile men

https://cwslc.andornot.com/en/permalink/catalog113960
Ferguson, Kyle Akira. [Vancouver, BC?]: University of British Columbia , 2008.
Website
http://hdl.handle.net/2429/1228
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While the introduction of intracytoplasmic sperm injection (ICSI) has revolutionized the treatment of male infertility, concerns have been raised regarding the risk of chromosomal abnormalities in pregnancies derived from ICSI. Studies on sperm from infertile men have suggested that this population…
Website
http://hdl.handle.net/2429/1228
Author
Ferguson, Kyle Akira
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2008
Subject
Faculty of Medicine
Theses
Abstract
While the introduction of intracytoplasmic sperm injection (ICSI) has revolutionized the treatment of male infertility, concerns have been raised regarding the risk of chromosomal abnormalities in pregnancies derived from ICSI. Studies on sperm from infertile men have suggested that this population may produce higher rates of aneuploid sperm. Thus, we hypothesized that defects in early meiotic events may contribute to both male infertility and the production of aneuploid sperm.
Language
English
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Recombinant human activated protein C as a therapy for pre-eclampsia

https://cwslc.andornot.com/en/permalink/catalog113962
Peng, Gang. [Vancouver, BC?]: University of British Columbia , 2007.
Website
http://hdl.handle.net/2429/32051
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Pre-eclampsia remains one of the most common causes of maternal mortality in the developed world, and we still have no known effective prophylaxis and proven modifiers. The recent successful clinical trial of recombinant human activated protein C (rhAPC) in the management of SIRS (systemic inflamma…
Website
http://hdl.handle.net/2429/32051
Author
Peng, Gang
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2007
Subject
Faculty of Medicine
Theses
Abstract
Pre-eclampsia remains one of the most common causes of maternal mortality in the developed world, and we still have no known effective prophylaxis and proven modifiers. The recent successful clinical trial of recombinant human activated protein C (rhAPC) in the management of SIRS (systemic inflammatory response syndrome) has drawn attention to the possible use of this medicine for other conditions. Pre-eclampsia, has remarkable similarity to SIRS and may be such a condition.
Language
English
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Expression and function of HOXA genes in the normal ovary and ovarian carcinoma

https://cwslc.andornot.com/en/permalink/catalog113963
Ota, Takayo. [Vancouver, BC?]: University of British Columbia , 2006.
Website
http://hdl.handle.net/2429/30974
Material Type
Thesis
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Thesis Shelf
Homeobox genes, which code for families of transcription factors, act at the top of genetic hierarchies. HOX genes specify positional identity during development, and in adult tissues, regulate differentiation and proliferation. Most ovarian carcinomas are derived from the ovarian surface epitheliu…
Website
http://hdl.handle.net/2429/30974
Author
Ota, Takayo
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2006
Subject
Faculty of Medicine
Theses
Abstract
Homeobox genes, which code for families of transcription factors, act at the top of genetic hierarchies. HOX genes specify positional identity during development, and in adult tissues, regulate differentiation and proliferation. Most ovarian carcinomas are derived from the ovarian surface epithelium (OSE). In contrast to other carcinomas, OSE differentiates further with neoplastic progression and acquires Mtillerian duct-derived epithelial properties. I tested the hypothesis that growth and differentiation in ovarian carcinogenesis are regulated by HOX genes.
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English
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Implications of BRCA-loss phenotype in epithelial ovarian carcinoma

https://cwslc.andornot.com/en/permalink/catalog113964
Press, Joshua Zephyr. [Vancouver, BC?]: University of British Columbia , 2006.
Website
http://hdl.handle.net/2429/32234
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Thesis
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Loss of BRCA1/BRCA2 function through genetic or epigenetic mechanisms is common in epithelial ovarian carcinomas (EOC), but because there are multiple potential mechanisms of loss, the overall frequency is unknown. We characterized loss of BRCA1/BRCA2 at the DNA, RNA and protein level from an unsel…
Website
http://hdl.handle.net/2429/32234
Author
Press, Joshua Zephyr
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2006
Subject
Faculty of Medicine
Theses
Abstract
Loss of BRCA1/BRCA2 function through genetic or epigenetic mechanisms is common in epithelial ovarian carcinomas (EOC), but because there are multiple potential mechanisms of loss, the overall frequency is unknown. We characterized loss of BRCA1/BRCA2 at the DNA, RNA and protein level from an unselected, consecutive series 49 non-mucinous, invasive EOC. BRCAl-loss was found in 21/49 tumors (43%).
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English
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Gonadotropins and leptin : the role and molecular mechanism in normal and neoplastic ovarian epithelium cells

https://cwslc.andornot.com/en/permalink/catalog113965
Choi, Jung-Hye. [Vancouver, BC?]: University of British Columbia , 2006.
Website
http://hdl.handle.net/2429/18509
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Thesis
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Ovarian cancer is the sixth most common cancer and the fifth leading cause of cancer-related death among women in developed countries. There is increasing evidence suggesting that the hormonal environment of the normal ovarian surface epithelium (OSE) and ovarian epithelial cancer (OEC) cells is as…
Website
http://hdl.handle.net/2429/18509
Author
Choi, Jung-Hye
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2006
Subject
Faculty of Medicine
Theses
Abstract
Ovarian cancer is the sixth most common cancer and the fifth leading cause of cancer-related death among women in developed countries. There is increasing evidence suggesting that the hormonal environment of the normal ovarian surface epithelium (OSE) and ovarian epithelial cancer (OEC) cells is associated with the development and progression of ovarian cancer. Exposure to excess gonadotropins and leptin, related to menopause or infertility therapy and obesity, respectively, has been implicated as a risk factor for ovarian cancer.
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English
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The prediction of adverse maternal outcomes in pre-eclampsia

https://cwslc.andornot.com/en/permalink/catalog113966
Devarakonda, Rajashree M. [Vancouver, BC?]: University of British Columbia , 2005.
Website
http://hdl.handle.net/2429/16403
Material Type
Thesis
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Pre-eclampsia (PET) continues to contribute to maternal and perinatal morbidity and mortality. Management decisions include an evaluation of maternal risk, which is assisted by expert opinion-based guidelines, while not accounting for gestational age (GA) at diagnosis. We evaluated the feasibility …
Website
http://hdl.handle.net/2429/16403
Author
Devarakonda, Rajashree M.
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2005
Subject
Faculty of Medicine
Theses
Abstract
Pre-eclampsia (PET) continues to contribute to maternal and perinatal morbidity and mortality. Management decisions include an evaluation of maternal risk, which is assisted by expert opinion-based guidelines, while not accounting for gestational age (GA) at diagnosis. We evaluated the feasibility of developing a severity score that can predict adverse maternal outcome.
Language
English
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Physical and functional interaction of p53 and p110a and implications in ovarian carcinogenesis

https://cwslc.andornot.com/en/permalink/catalog113967
Astanehe, Arezoo. [Vancouver, BC?]: University of British Columbia , 2005.
Website
http://hdl.handle.net/2429/16421
Material Type
Thesis
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n approximately 40% of ovarian cancers, PIK3CA, which encodes the p110α catalytic subunit of phosphatidylinositol 3-kinase (PI3K) is amplified. This amplification correlates with increased PIK3CA transcription, p110α protein expression, and PI3K activity. Moreover, PIK3CA is implicated as…
Website
http://hdl.handle.net/2429/16421
Author
Astanehe, Arezoo
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2005
Subject
Faculty of Medicine
Theses
Abstract
n approximately 40% of ovarian cancers, PIK3CA, which encodes the p110α catalytic subunit of phosphatidylinositol 3-kinase (PI3K) is amplified. This amplification correlates with increased PIK3CA transcription, p110α protein expression, and PI3K activity. Moreover, PIK3CA is implicated as an oncogene in ovarian cancers. Another common mutation in ovarian cancer leads to loss of p53 function. Alterations to p53 are known to be involved in tumour development and progression.
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English
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The maternal predisposition to the syndrome of pre-eclampsia

https://cwslc.andornot.com/en/permalink/catalog113968
Alasaly, Kadria A. [Vancouver, BC?]: University of British Columbia , 2004.
Website
http://hdl.handle.net/2429/15429
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Thesis
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Pre-eclampsia, which is characterized by maternal hypertension, proteinuria, hypoperfusion of end organs and a systemic maternal innate inflammatory response, is a leading cause of maternal mortality and morbidity world-wide. When of early-onset, pre-eclampsia is associated with fetal intrauterine …
Website
http://hdl.handle.net/2429/15429
Author
Alasaly, Kadria A.
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2004
Subject
Faculty of Medicine
Theses
Abstract
Pre-eclampsia, which is characterized by maternal hypertension, proteinuria, hypoperfusion of end organs and a systemic maternal innate inflammatory response, is a leading cause of maternal mortality and morbidity world-wide. When of early-onset, pre-eclampsia is associated with fetal intrauterine growth restriction (IUGR). IUGR can occur in isolation, so-called normotensive IUGR. What is poorly understood is that some women develop the maternal syndrome of pre-eclampsia whilst others have only the fetal syndrome (normotensive IUGR), despite the fact that the initiating event in both is believed to be reduced uteroplacental perfusion.
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English
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Maternal leukocyte CD markers, apoptosis and band forms in preeclampsia

https://cwslc.andornot.com/en/permalink/catalog113970
Fuchisawa, Akiko. [Vancouver, BC?]: University of British Columbia , 2003.
Website
http://hdl.handle.net/2429/14664
Material Type
Thesis
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Preeclampsia is a pregnancy-specific condition, and it still remains one of the most common causes of maternal mortality in the developed world. Although the exact cause of preeclampsia has not been identified, it is most widely accepted that preeclampsia results from incomplete placentation. Inter…
Website
http://hdl.handle.net/2429/14664
Author
Fuchisawa, Akiko
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2003
Subject
Faculty of Medicine
Theses
Abstract
Preeclampsia is a pregnancy-specific condition, and it still remains one of the most common causes of maternal mortality in the developed world. Although the exact cause of preeclampsia has not been identified, it is most widely accepted that preeclampsia results from incomplete placentation. Interestingly, normotensive intrauterine growth restriction also shows the same defect of placentation. In preeclampsia, the maternal syndrome develops from a number of alternative pathways leading to uteroplacental mismatch and, consequently, the release of endothelium-activating factors. This research is focused on neutrophil activation and the hypothesis for this research was that maternal neutrophils and monocytes are inappropriately activated in preeclampsia but not in normotensive intrauterine growth restriction.
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English
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A Biological role for GnRH I and GnRH II at the maternal-fetal interface

https://cwslc.andornot.com/en/permalink/catalog113971
Zhou, Junshan. [Vancouver, BC?]: University of British Columbia , 2003.
Website
http://hdl.handle.net/2429/14957
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Remodeling of the endometrial extracellular matrix, which occurs during the early stages of pregnancy in the human, is mediated by the temporal expression of urokinase-type plasminogen activator (uPA) and matrix metalloproteinases (MMP) in both the maternal and fetal compartments and counterbalance…
Website
http://hdl.handle.net/2429/14957
Author
Zhou, Junshan
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2003
Subject
Faculty of Medicine
Theses
Abstract
Remodeling of the endometrial extracellular matrix, which occurs during the early stages of pregnancy in the human, is mediated by the temporal expression of urokinase-type plasminogen activator (uPA) and matrix metalloproteinases (MMP) in both the maternal and fetal compartments and counterbalanced by their respective endogenous inhibitors, plasminogen activator inhibitor (PAI-1) and tissue inhibitors of metalloproteinases (TIMPs) in both an autocrine and paracrine manner. To date, the factors capable of regulating the expression of uPA and MMP proteolytic systems at the maternal-fetal interface remain poorly characterized.
Language
English
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Influences of endocrine and autocrine factors in normal and neoplastic ovarian surface epithelium

https://cwslc.andornot.com/en/permalink/catalog113974
Choi, Kyung-Chul. [Vancouver, BC?]: University of British Columbia , 2001.
Website
http://hdl.handle.net/2429/13688
Material Type
Thesis
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The common epithelial ovarian tumors appear to arise from the ovarian surface epithelium (OSE), which is a simple squamous-to-cuboidal meso^helium covering the ovary. The exact mechanism of ovarian tumorigenesis is not well known even though this disease is the most frequent cause of cancer death i…
Website
http://hdl.handle.net/2429/13688
Author
Choi, Kyung-Chul
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
2001
Subject
Faculty of Medicine
Theses
Abstract
The common epithelial ovarian tumors appear to arise from the ovarian surface epithelium (OSE), which is a simple squamous-to-cuboidal meso^helium covering the ovary. The exact mechanism of ovarian tumorigenesis is not well known even though this disease is the most frequent cause of cancer death in gynecological malignancies. Repeated ovulation contributes to neoplastic transformation of OSE, indicating that the process of healing ruptured OSE may contribute to the disease. Therefore, it has been hypothesized that endocrine and autocrine factors may influence the occurrence of ovarian tumors in women.
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English
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E-cadherin promotes tumorigenicity in human ovarian surface epithelium

https://cwslc.andornot.com/en/permalink/catalog113975
Ong, Aldrich Dixon. [Vancouver, BC?]: University of British Columbia , 1999.
Website
http://hdl.handle.net/2429/9760
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Thesis
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Ovarian cancer is the most lethal gynecological cancer in the Western world, but comparatively little is known about its development. Epithelial ovarian carcinomas are thought to originate in the ovarian surface epithelium (OSE), i.e. the mesothelium covering the ovary, but experimental evidence fo…
Website
http://hdl.handle.net/2429/9760
Author
Ong, Aldrich Dixon
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1999
Subject
Faculty of Medicine
Theses
Abstract
Ovarian cancer is the most lethal gynecological cancer in the Western world, but comparatively little is known about its development. Epithelial ovarian carcinomas are thought to originate in the ovarian surface epithelium (OSE), i.e. the mesothelium covering the ovary, but experimental evidence for this origin has been lacking. Contrary to most epithelia where neoplastic progression is associated with loss of E-cadherin, this cell-cell adhesion molecule is sparse in normal human OSE but its expression increases in ovarian epithelial metaplasia and neoplasia.
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English
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Prostaglandin F[sub 2a]-mediated luteolytic and luteotrophic effects on the human granulosa-luteal cell

https://cwslc.andornot.com/en/permalink/catalog113976
Vaananen, Jeffrey Eric. [Vancouver, BC?]: University of British Columbia , 1997.
Website
http://hdl.handle.net/2429/6811
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These studies examined the effects of prostaglandin-F[sub 2a] (PGF[sub 2a]) on progesterone and 178-estradiol (estradiol) production, as well as DNA and PGF[sub 2a]-receptor (PGF[sub 2a]-R) mRNA levels, in the human granulosa-luteal cell (GLC). Additionally, the interactions of PGF[sub 2a] with hum…
Website
http://hdl.handle.net/2429/6811
Author
Vaananen, Jeffrey Eric
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1997
Subject
Faculty of Medicine
Theses
Abstract
These studies examined the effects of prostaglandin-F[sub 2a] (PGF[sub 2a]) on progesterone and 178-estradiol (estradiol) production, as well as DNA and PGF[sub 2a]-receptor (PGF[sub 2a]-R) mRNA levels, in the human granulosa-luteal cell (GLC). Additionally, the interactions of PGF[sub 2a] with human chorionic gonadotrophin (hCG), gonadotrophin-releasing hormone (GnRH) and prostaglandin E₂ (PGE₂) were examined, with respect to progesterone and estradiol production.
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English
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Regulation of rat ovarian gonadotropin Releasing hormone receptor mRNA levels

https://cwslc.andornot.com/en/permalink/catalog113977
Vaananen, Celine Claire. [Vancouver, BC?]: University of British Columbia , 1997.
Website
http://hdl.handle.net/2429/6615
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The studies undertaken herewithin sought to characterize the pattern of regulation of the gonadotrophin-releasing hormone receptor (GnRH-R) mRNA levels in the rat ovary. The demonstration of gonadotrophin-releasing hormone (GnRH) transcripts in steroidproducing and steroid-dependent tissues suggest…
Website
http://hdl.handle.net/2429/6615
Author
Vaananen, Celine Claire
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1997
Subject
Faculty of Medicine
Theses
Abstract
The studies undertaken herewithin sought to characterize the pattern of regulation of the gonadotrophin-releasing hormone receptor (GnRH-R) mRNA levels in the rat ovary. The demonstration of gonadotrophin-releasing hormone (GnRH) transcripts in steroidproducing and steroid-dependent tissues suggests that GnRH may be implicated in the modulation of steroid action in those target tissues. Expression of GnRH-R mRNA increases in gonadal tissues and the pituitary with age, supporting the concept of GnRH as a local regulator in the developing rat as well as in the adult.
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English
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Localization and regulation of mRNA transcripts encoding activin receptors in human placental trophoblast cells

https://cwslc.andornot.com/en/permalink/catalog113978
Chen, Victor. [Vancouver, BC?]: University of British Columbia , 1997.
Website
http://hdl.handle.net/2429/6315
Material Type
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There is increasing evidence to suggest that activin can function as an autocrine/paracrine regulator in various tissues, including the reproductive system. At the cellular level, activin acts via a family of activin receptor (ActR) subtypes which includes two type I (ActRI and ActRLB) and two type…
Website
http://hdl.handle.net/2429/6315
Author
Chen, Victor
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1997
Subject
Faculty of Medicine
Theses
Abstract
There is increasing evidence to suggest that activin can function as an autocrine/paracrine regulator in various tissues, including the reproductive system. At the cellular level, activin acts via a family of activin receptor (ActR) subtypes which includes two type I (ActRI and ActRLB) and two type II (II and ILB) receptors. The role of activin in the human placenta is not clearly understood. In this study, the detection of inlubin/activin subunit and ActRI mRNA were examined in first trimester cytotrophoblasts, term cytotrophoblasts, extravillous trophoblast (EVT) cells, immortalized extravillous trophoblast (LEVT) cells, JEG-3 cells, decidual tissue, and decidual cells.
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English
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Single cell studies of calcium as second messenger in human granulosa-lutein and embryonic kidney 293 cells

https://cwslc.andornot.com/en/permalink/catalog113979
Lee, Pearly S.N. [Vancouver, BC?]: University of British Columbia , 1999.
Website
http://hdl.handle.net/2429/10789
Material Type
Thesis
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It is well established that LH action is mediated primarily by adenylate cyclase/cAMP. Conversely, the role of inositol phosphate/calcium in LH signalling has only recently been investigated. We examined the effects of gonadotrophins on intracellular calcium mobilisation in HEK293 cells transiently…
Website
http://hdl.handle.net/2429/10789
Author
Lee, Pearly S.N.
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1999
Subject
Faculty of Medicine
Theses
Abstract
It is well established that LH action is mediated primarily by adenylate cyclase/cAMP. Conversely, the role of inositol phosphate/calcium in LH signalling has only recently been investigated. We examined the effects of gonadotrophins on intracellular calcium mobilisation in HEK293 cells transiently transfected with human wild type or chimeric gonadotrophs receptors (n=3400). Intracellular free calcium concentration was measured using fura-2 microspectrofluorimetric techniques. Human LH (2-4 μg/ml) arid CG (10 IU/ml) consistently evoked oscillatory calcium signals in HEK293 cells transfected with hLHr, whereas hFSH (2-4 μg/ml) failed to elicit any calcium responses.
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English
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The role for insulin-like growth factor-I in preimplantation embryonic development and decidualization following superovulation in the rat

https://cwslc.andornot.com/en/permalink/catalog113980
Katagiri, Seiji. [Vancouver, BC?]: University of British Columbia , 1996.
Website
http://hdl.handle.net/2429/4814
Material Type
Thesis
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Thesis Shelf
Superovulation causes detrimental effects, including embryonic loss and implantation failure. This study determined potential roles for insulin-like growth factor (IGF-I) in uterine environment regulation and preimplantation development, in conjunction with the detrimental effects of superovulation…
Website
http://hdl.handle.net/2429/4814
Author
Katagiri, Seiji
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1996
Subject
Faculty of Medicine
Theses
Abstract
Superovulation causes detrimental effects, including embryonic loss and implantation failure. This study determined potential roles for insulin-like growth factor (IGF-I) in uterine environment regulation and preimplantation development, in conjunction with the detrimental effects of superovulation in the rat. IGF-I may be beneficial to preimplantation embryonic development. IGF-I stimulated embryonic development and metabolism in vitro and increased the rate of implantation and fetal development when the blastocysts were transferred into a receptive uterus.
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English
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Maternal progesterone and fetal cortisol responses to hypoxemia in pregnant sheep

https://cwslc.andornot.com/en/permalink/catalog113981
Wu, Li-Hua. [Vancouver, BC?]: University of British Columbia , 1996.
Website
http://hdl.handle.net/2429/4269
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Thesis
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The placenta is an important endocrine organ producing large amounts of steroid and protein hormones which are released into the maternal and fetal circulations. Moreover, it has a very high metabolic rate and consumes a significant proportion of the oxygen and glucose delivered to the uterus and i…
Website
http://hdl.handle.net/2429/4269
Author
Wu, Li-Hua
Place of Publication
[Vancouver, BC?]
Publisher
University of British Columbia
Publication Date
1996
Subject
Faculty of Medicine
Theses
Abstract
The placenta is an important endocrine organ producing large amounts of steroid and protein hormones which are released into the maternal and fetal circulations. Moreover, it has a very high metabolic rate and consumes a significant proportion of the oxygen and glucose delivered to the uterus and its contents. However, while there have been many studies on the effects of hypoxemia on fetal cardiovascular, metabolic and endocrine functions, there are limited data on the effects of reduced oxygenation on placental endocrine activities. In the present study, we examined the effects of acute (2-h) moderate (maternal Pao₂ lowered by 27-35%, n=5) and severe (maternal Pao₂ lowered by 41-58%, n=4) hypoxemia on placental progesterone output into the maternal circulation in 7 chronically instrumented pregnant sheep (125 to 136 d). Hypoxemia was achieved by lowering maternal inspired O₂ concentration and the hypoxemia period was preceded and followed by 2 h pre-hypoxia and recovery periods, respectively. Control experiments (n=4), involving 6 h periods of normoxia were also carried out.
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English
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20 records – page 2 of 1.