title: [The effect of chronic intermittent hypoxia to hypothalamus-pituitary-adrenal axis and growth hormone level in rats during sleep].
abstract: OBJECTIVE
  To research the effect of intermittent hypoxia during sleep on hypothalamus-pituitary-adrenal (HPA) axis and growth hormone (GH) level.
  
  
  METHODS
  Rats were respectively exposed to intermittent hypoxia, room air and continuous hypoxia, after 1 day, 3 days, 7 days and 30 days, mRNA levels of corticotropin-releasing hormone (CRH) and growth hormone releasing hormone (GHRH) in hypothalamus of rats were detected using RT-PCR, and the levels of CRH, GHRH, corticotropin(ACTH), cortex ketone, and growth hormone in plasma were measured.
  
  
  RESULTS
  After 30 days, the CRH mRNA levels in rats hypothalamus which exposed to intermittent hypoxia were increased significantly than those exposed to continuous hypoxia as well as normal control but GHRH decreased, there was no difference between continuous hypoxia and normal control. After 1 day, 3 days, and 7 days, there was no difference between continuous hypoxia and intermittent hypoxia. After 30 days, the plasmic level of CRH,ACTH and cortex ketone increased, GHRH decreased and GH had no obvious change.
  
  
  CONCLUSIONS
  The rats' HPA axis level increases and GHRH restrained with chronic intermittent hypoxia during sleep, feedback regulation disorders.
authors.affiliation: Institute of Respiratory Disease, the First Hospital, China Medical University, Shenyang 110001, China.
authors.forename: Xue-Wei
authors.initials: XW
authors.lastname: Feng
authors.forename: Jian
authors.initials: J
authors.lastname: Kang
authors.forename: Zan-Feng
authors.initials: ZF
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Run-Jiang
authors.initials: RJ
authors.lastname: Yu
mesh_terms: D000818:Animals; D003346:Corticotropin-Releasing Hormone / Q000378:metabolism; D013006:Growth Hormone / Q000378:metabolism*; D013007:Growth Hormone-Releasing Hormone / Q000378:metabolism; D007030:Hypothalamo-Hypophyseal System; D000860:Hypoxia; D008297:Male; D010913:Pituitary-Adrenal System; D051381:Rats; D017208:Rats, Wistar; D012891:Sleep Apnea Syndromes / Q000378:metabolism*
chemical_list: D013006:Growth Hormone; D003346:Corticotropin-Releasing Hormone; D013007:Growth Hormone-Releasing Hormone