Urea sensitizes mIMCD3 cells to heat shock-induced apoptosis: protection by NaCl.
Urea, with NaCl, constitutes the osmotic gradient that allows water reabsorption in mammalian kidneys. Because NaCl induces heat shock proteins, we tested the responses to heat shock of mIMCD3 cells adapted to permissive urea and/or NaCl concentrations. We found that heat-induced cell death was stronger after adaptation to 250 mM urea. This effect was reversible, dose dependent, and, interestingly, blunted by 125 mM NaCl. Moreover, we have shown that urea-adapted cells engaged in an apoptotic pathway upon heat shock, as shown by DNA laddering. This sensitization is not linked to a defect in the heat shock response, because the induction of HSP70 was similar in isotonic and urea-adapted cells. Moreover, it is not linked to the presence of urea inside cells, because washing urea away did not restore heat resistance and because applying urea and heat shock at the same time did not lead to heat sensitivity. Together, these results suggest that urea modifies the heat shock response, leading to facilitated apoptosis.
Colmont
C
C
Service de Biologie Cellulaire, Commissariat à l'Energie Atomique, Centre d'Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France.
Michelet
S
S
Guivarc'h
D
D
Rousselet
G
G
D000222:Adaptation, Physiological; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D006360:Heat-Shock Proteins / Q000378:metabolism; D006358:Hot Temperature; D007679:Kidney Medulla; D007685:Kidney Tubules, Collecting / Q000187:drug effects* / Q000473:pathology / Q000503:physiopathology*; D051379:Mice; D012769:Shock / Q000503:physiopathology*; D012965:Sodium Chloride / Q000494:pharmacology*; D014508:Urea / Q000494:pharmacology*
D006360:Heat-Shock Proteins; D012965:Sodium Chloride; D014508:Urea