title: Dehydroepiandrosterone pretreatment alters the ischaemia/reperfusion-induced VEGF, IL-1 and IL-6 gene expression in acute renal failure.
abstract: BACKGROUND
  Beneficial effects of dehydroepiandrosterone (DHEA) pretreatment were reported in ischaemia/reperfusion (I/R)-induced kidney damage.
  
  
  METHODS
  To investigate the mechanism of DHEA pretreatment during renal I/R injury, the left renal pedicles of DHEA- [G(DHEA); 4.0 mg/kg/day DHEA dissolved in propylene glycol (PG)] and PG-pretreated male Wistar rats (G(PG)) were clamped for 55 min followed by 2 (T(2)) and 24 h (T(24)) of reperfusion. Sham-operated, non-clamped animals (T(0)) served as controls in both groups. Renal function, kidney morphology and interleukin 1beta (IL-1beta), interleukin 6 (IL-6) and vascular endothelial growth factor (VEGF) expression were determined in the kidneys of both groups.
  
  
  RESULTS
  Renal functional parameters and kidney structure did not differ in G(DHEA) versus G(PG) at any time point. Renal mRNA expression of IL-1beta was lower at T(0), while IL-6 at T(2) was lower in G(DHEA) than in G(PG).While renal VEGF mRNA expression remained unchanged, protein levels were increased at T(2) and T(24 )compared to T(0) kidneys in both groups. VEGF protein levels were lower at T(2) and T(24 )in G(DHEA) than in G(PG).
  
  
  CONCLUSIONS
  We found that DHEA pretreatment alters renal IL-1beta, IL-6 and VEGF synthesis. Moreover, contrary changes in VEGF mRNA and protein levels suggest that VEGF synthesis - distinct from other organs - might be primarily posttranscriptionally regulated in postischaemic rat kidneys.
authors.affiliation: Research Laboratory of Paediatrics and Nephrology, Hungarian Academy of Sciences, Budapest, Hungary. vannay@gyer1.sote.hu
authors.forename: Adám
authors.initials: A
authors.lastname: Vannay
authors.forename: Andrea
authors.initials: A
authors.lastname: Fekete
authors.forename: Róbert
authors.initials: R
authors.lastname: Langer
authors.forename: Tibor
authors.initials: T
authors.lastname: Tóth
authors.forename: Erna
authors.initials: E
authors.lastname: Sziksz
authors.forename: Barna
authors.initials: B
authors.lastname: Vásárhelyi
authors.forename: Attila J
authors.initials: AJ
authors.lastname: Szabó
authors.forename: Gyorgy
authors.initials: G
authors.lastname: Losonczy
authors.forename: Csaba
authors.initials: C
authors.lastname: Adori
authors.forename: Anikó
authors.initials: A
authors.lastname: Gál
authors.forename: Tivadar
authors.initials: T
authors.lastname: Tulassay
authors.forename: András
authors.initials: A
authors.lastname: Szabó
mesh_terms: D058186:Acute Kidney Injury / Q000150:complications*; D000818:Animals; D003687:Dehydroepiandrosterone / Q000494:pharmacology* / Q000627:therapeutic use; D005786:Gene Expression Regulation / Q000187:drug effects; D036341:Intercellular Signaling Peptides and Proteins / Q000096:biosynthesis / Q000235:genetics*; D007375:Interleukin-1 / Q000096:biosynthesis / Q000235:genetics; D015850:Interleukin-6 / Q000096:biosynthesis / Q000235:genetics; D008297:Male; D011292:Premedication / Q000379:methods*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000378:metabolism*; D016896:Treatment Outcome; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis / Q000235:genetics
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D007375:Interleukin-1; D015850:Interleukin-6; D012333:RNA, Messenger; D042461:Vascular Endothelial Growth Factor A; D003687:Dehydroepiandrosterone