title: Generation of immortal cell lines from the adult pituitary: role of cAMP on differentiation of SOX2-expressing progenitor cells to mature gonadotropes.
abstract: The pituitary is a complex endocrine tissue composed of a number of unique cell types distinguished by the expression and secretion of specific hormones, which in turn control critical components of overall physiology. The basic function of these cells is understood; however, the molecular events involved in their hormonal regulation are not yet fully defined. While previously established cell lines have provided much insight into these regulatory mechanisms, the availability of representative cell lines from each cell lineage is limited, and currently none are derived from adult pituitary. We have therefore used retroviral transfer of SV40 T-antigen to mass immortalize primary pituitary cell culture from an adult mouse. We have generated 19 mixed cell cultures that contain cells from pituitary cell lineages, as determined by RT-PCR analysis and immunocytochemistry for specific hormones. Some lines expressed markers associated with multipotent adult progenitor cells or transit-amplifying cells, including SOX2, nestin, S100, and SOX9. The progenitor lines were exposed to an adenylate cyclase activator, forskolin, over 7 days and were induced to differentiate to a more mature gonadotrope cell, expressing significant levels of α-subunit, LHβ, and FSHβ mRNAs. Additionally, clonal populations of differentiated gonadotropes were exposed to 30 nM gonadotropin-releasing hormone and responded appropriately with a significant increase in α-subunit and LHβ transcription. Further, exposure of the lines to a pulse paradigm of GnRH, in combination with 17β-estradiol and dexamethasone, significantly increased GnRH receptor mRNA levels. This array of adult-derived pituitary cell models will be valuable for both studies of progenitor cell characteristics and modulation, and the molecular analysis of individual pituitary cell lineages.
authors: Department of Physiology, University of Toronto, Toronto, Ontario, Canada.
authors: Ginah L
authors: GL
authors: Kim
authors: Xiaomei
authors: X
authors: Wang
authors: Jennifer A
authors: JA
authors: Chalmers
authors: David R
authors: DR
authors: Thompson
authors: Sandeep S
authors: SS
authors: Dhillon
authors: Margaret M
authors: MM
authors: Koletar
authors: Denise D
authors: DD
authors: Belsham
mesh_terms: D000375:Aging / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D018929:Cell Culture Techniques / Q000379:methods*; D002454:Cell Differentiation / Q000187:drug effects*; D002461:Cell Line, Transformed; D005576:Colforsin / Q000494:pharmacology; D016895:Culture Media, Serum-Free; D000242:Cyclic AMP / Q000494:pharmacology*; D037201:Follicle Stimulating Hormone, beta Subunit / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D015292:Glycoprotein Hormones, alpha Subunit / Q000235:genetics / Q000378:metabolism; D052681:Gonadotrophs / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D007986:Luteinizing Hormone / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D010902:Pituitary Gland / Q000166:cytology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D055748:SOXB1 Transcription Factors / Q000235:genetics / Q000378:metabolism*; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism
chemical_list: D015415:Biomarkers; D016895:Culture Media, Serum-Free; D037201:Follicle Stimulating Hormone, beta Subunit; D015292:Glycoprotein Hormones, alpha Subunit; D012333:RNA, Messenger; D055748:SOXB1 Transcription Factors; D005576:Colforsin; D007986:Luteinizing Hormone; D000242:Cyclic AMP