{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19514"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19514","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Steroidogenic cell populations in follicles of the chicken ovary","abstract":"A two cell theory for steroidogenesis in preovulatory follicles of the chicken ovary states that the granulosa layer metabolizes cholesterol to progestins and progestins are, then, metabolized to androgens and estrogens by the theca layer. However, the precise site of steroidogenic cells in the theca layer of preovulatory follicles and in small follicles of the chicken ovary has not been identified. Therefore, objectives of my dissertation were: (1) to identify steroidogenic cells in the theca layer of preovulatory follicles by immunocytochemistry for P450 steroidogenic enzymes and to measure steroid production by isolated theca cells in a short term cell incubation (Experiment 1); (2) to localize cell populations containing P450 steroidogenic enzymes in small follicles by immunocytochemistry (Experiment 2); and (3) to identify the site of 3$\\beta$-hydroxysteroid dehydrogenase (3$\\beta$-HSD) in small, preovulatory, and postovulatory follicles (Experiment 3). Follicles were obtained from regularly laying chickens 2 hours after oviposition of the first egg of a clutch. P450 steroidogenic enzymes stained in Experiments 1 and 2 were cholesterol side-chain cleavage cytochrome P450, 17$\\alpha$-hydroxylase cytochrome P450, and aromatase cytochrome P450 to identify pregnenolone-, androgen-, or estrogen-producing cells, respectively.","abstract_html":"A two cell theory for steroidogenesis in preovulatory follicles of the chicken ovary states that the granulosa layer metabolizes cholesterol to progestins and progestins are, then, metabolized to androgens and estrogens by the theca layer. However, the precise site of steroidogenic cells in the theca layer of preovulatory follicles and in small follicles of the chicken ovary has not been identified. Therefore, objectives of my dissertation were: (1) to identify steroidogenic cells in the theca layer of preovulatory follicles by immunocytochemistry for P450 steroidogenic enzymes and to measure steroid production by isolated theca cells in a short term cell incubation (Experiment 1); (2) to localize cell populations containing P450 steroidogenic enzymes in small follicles by immunocytochemistry (Experiment 2); and (3) to identify the site of 3<span class=\"etd-inline-math\">&beta;</span>-hydroxysteroid dehydrogenase (3<span class=\"etd-inline-math\">&beta;</span>-HSD) in small, preovulatory, and postovulatory follicles (Experiment 3). Follicles were obtained from regularly laying chickens 2 hours after oviposition of the first egg of a clutch. P450 steroidogenic enzymes stained in Experiments 1 and 2 were cholesterol side-chain cleavage cytochrome P450, 17<span class=\"etd-inline-math\">&alpha;</span>-hydroxylase cytochrome P450, and aromatase cytochrome P450 to identify pregnenolone-, androgen-, or estrogen-producing cells, respectively.","abstract_has_math":true,"creators":["Nitta, Hiroaki"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Animal Science","degree_department":null,"school":null,"contributors":["Bahr, Janice M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:09:53Z","date_published":"2011-05-07T12:09:53Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Biology, Anatomy","Biology, Animal Physiology","Biology, Veterinary Science"],"languages":["eng"],"rights":["Copyright 1992 Nitta, Hiroaki"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9236553","(UMI)AAI9236553"],"render_values":[{"text":"AAI9236553","href":null,"code":true},{"text":"(UMI)AAI9236553","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19514","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bahr, Janice M."]},{"key":"dc:creator","label":"Author","values":["Nitta, Hiroaki"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:09:53Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Animal Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology, Anatomy","Biology, Animal Physiology","Biology, Veterinary Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1992 Nitta, Hiroaki"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9236553","(UMI)AAI9236553","http://hdl.handle.net/2142/19514"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["A two cell theory for steroidogenesis in preovulatory follicles of the chicken ovary states that the granulosa layer metabolizes cholesterol to progestins and progestins are, then, metabolized to androgens and estrogens by the theca layer. However, the precise site of steroidogenic cells in the theca layer of preovulatory follicles and in small follicles of the chicken ovary has not been identified. Therefore, objectives of my dissertation were: (1) to identify steroidogenic cells in the theca layer of preovulatory follicles by immunocytochemistry for P450 steroidogenic enzymes and to measure steroid production by isolated theca cells in a short term cell incubation (Experiment 1); (2) to localize cell populations containing P450 steroidogenic enzymes in small follicles by immunocytochemistry (Experiment 2); and (3) to identify the site of 3$\\beta$-hydroxysteroid dehydrogenase (3$\\beta$-HSD) in small, preovulatory, and postovulatory follicles (Experiment 3). Follicles were obtained from regularly laying chickens 2 hours after oviposition of the first egg of a clutch. P450 steroidogenic enzymes stained in Experiments 1 and 2 were cholesterol side-chain cleavage cytochrome P450, 17$\\alpha$-hydroxylase cytochrome P450, and aromatase cytochrome P450 to identify pregnenolone-, androgen-, or estrogen-producing cells, respectively.","Experiment 1. The theca layer of preovulatory follicles contains three steroidogenic cell populations: (1) interstitial cells for progestin and androgen production from cholesterol; (2) fibroblasts as a possible conversion site from progestins to androgens; and (3) aromatase cells for estrogen production from androgens (a multiple cell theory for steroidogenesis in the theca layer of preovulatory follicles).","Experiment 2. In small follicles, the theca layer, but not the granulosa layer, is the site of steroidogenesis. There are two populations of steroid synthesizing cells in the theca layer of small follicles: (1) interstitial cells for progestin and androgen production and (2) aromatase cells for estrogen production (a two cell theory for steroidogenesis in small follicles).","Experiment 3. The localization of 3$\\beta$-HSD shifts from the theca layer of small follicles to the granulosa and theca layers of preovulatory follicles and, then, to the granulosa layer of the postovulatory follicle.","In conclusion, the localization and distribution of steroidogenic cells in follicles change during follicular maturation and the interaction between steroidogenic cells is required for complete steroid production in follicles of the chicken ovary.","Made available in DSpace on 2011-05-07T12:09:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9236553.pdf: 5502680 bytes, checksum: ed09e08d26968fa372aa660b2a4a8697 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:37:33Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Steroidogenic cell populations in follicles of the chicken ovary"]}]}],"canonical_facts":{"dc:contributor":["Bahr, Janice M."],"dc:creator":["Nitta, Hiroaki"],"dc:date":["2011-05-07T12:09:53Z","10000-01-01","1992"],"dc:description":["A two cell theory for steroidogenesis in preovulatory follicles of the chicken ovary states that the granulosa layer metabolizes cholesterol to progestins and progestins are, then, metabolized to androgens and estrogens by the theca layer. However, the precise site of steroidogenic cells in the theca layer of preovulatory follicles and in small follicles of the chicken ovary has not been identified. Therefore, objectives of my dissertation were: (1) to identify steroidogenic cells in the theca layer of preovulatory follicles by immunocytochemistry for P450 steroidogenic enzymes and to measure steroid production by isolated theca cells in a short term cell incubation (Experiment 1); (2) to localize cell populations containing P450 steroidogenic enzymes in small follicles by immunocytochemistry (Experiment 2); and (3) to identify the site of 3$\\beta$-hydroxysteroid dehydrogenase (3$\\beta$-HSD) in small, preovulatory, and postovulatory follicles (Experiment 3). Follicles were obtained from regularly laying chickens 2 hours after oviposition of the first egg of a clutch. P450 steroidogenic enzymes stained in Experiments 1 and 2 were cholesterol side-chain cleavage cytochrome P450, 17$\\alpha$-hydroxylase cytochrome P450, and aromatase cytochrome P450 to identify pregnenolone-, androgen-, or estrogen-producing cells, respectively.","Experiment 1. The theca layer of preovulatory follicles contains three steroidogenic cell populations: (1) interstitial cells for progestin and androgen production from cholesterol; (2) fibroblasts as a possible conversion site from progestins to androgens; and (3) aromatase cells for estrogen production from androgens (a multiple cell theory for steroidogenesis in the theca layer of preovulatory follicles).","Experiment 2. In small follicles, the theca layer, but not the granulosa layer, is the site of steroidogenesis. There are two populations of steroid synthesizing cells in the theca layer of small follicles: (1) interstitial cells for progestin and androgen production and (2) aromatase cells for estrogen production (a two cell theory for steroidogenesis in small follicles).","Experiment 3. The localization of 3$\\beta$-HSD shifts from the theca layer of small follicles to the granulosa and theca layers of preovulatory follicles and, then, to the granulosa layer of the postovulatory follicle.","In conclusion, the localization and distribution of steroidogenic cells in follicles change during follicular maturation and the interaction between steroidogenic cells is required for complete steroid production in follicles of the chicken ovary.","Made available in DSpace on 2011-05-07T12:09:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9236553.pdf: 5502680 bytes, checksum: ed09e08d26968fa372aa660b2a4a8697 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:37:33Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9236553","(UMI)AAI9236553","http://hdl.handle.net/2142/19514"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Nitta, Hiroaki"],"dc:subject":["Biology, Anatomy","Biology, Animal Physiology","Biology, Veterinary Science"],"dc:title":["Steroidogenic cell populations in follicles of the chicken ovary"],"dc:type":["text"],"thesis:degree_discipline":["Animal Science"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:14Z"}