title: Angiogenesis in the course of enucleation-induced adrenal regeneration--expression of selected genes and proteins involved in development of capillaries.
abstract: Enucleation-induced rapid proliferation of adrenocortical cells and restoration of adrenals structure requires formation of new blood vessels. The performed studies aimed to select from around 30,000 transcripts, identified by means of Affymetrix(®) Rat Gene 1.1 ST Array, the genes involved in angiogenesis in the course of enucleation-induced adrenal regeneration and to characterize their expression levels in regenerating gland between days 1 and 15 after surgery. At day 1 of regeneration almost 2000 genes showed more than 2-fold up/down-regulation. At days 1-3 after surgery the highest expression demonstrated genes involved in the development of inflammation and blood clot formation. From around 2000 genes we selected genes involved in angiogenesis. During the regeneration 62 genes involved in angiogenesis were identified as up- or down-regulated. Some data were also validated by QPCR. Levels of Vegfa and Kdr (Vegfr-2) mRNAs were very low at day 1 of regeneration and remained unchanged thereafter. The highest expression of Figf gene was found at day 5 while that of Vwf gene at days 1 and 2 after surgery. Levels of Thy1 mRNA increased notably between days 2 and 5 of the experiment. In comparison to control rats, Mc2r (ACTH receptor) expression was lowered at day 1 of the experiment and remained unchanged thereafter. This suggests that enucleation-induced adrenal neoangiogenesis does not require elevated expression of ACTH receptor. Results of our studies strongly suggest that enucleation-induced adrenal regeneration is an angiogenesis-dependent process. Moreover, immunohistochemistry suggests that regenerating adrenal parenchymal cells release numerous angiogenic factors which paracrinally may regulate formation of new vessels.
authors.affiliation: Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland.
authors.forename: Marianna
authors.initials: M
authors.lastname: Tyczewska
authors.forename: Marcin
authors.initials: M
authors.lastname: Rucinski
authors.forename: Marcin
authors.initials: M
authors.lastname: Trejter
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Ziolkowska
authors.forename: Marta
authors.initials: M
authors.lastname: Szyszka
authors.forename: Ludwik K
authors.initials: LK
authors.lastname: Malendowicz
mesh_terms: D000311:Adrenal Glands / Q000378:metabolism*; D000818:Animals; D002196:Capillaries / Q000378:metabolism* / Q000473:pathology; D005260:Female; D009389:Neovascularization, Pathologic / Q000235:genetics / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D044103:Receptor, Melanocortin, Type 2 / Q000235:genetics* / Q000378:metabolism
chemical_list: D012333:RNA, Messenger; D044103:Receptor, Melanocortin, Type 2