title: Metabolic, energetic and structural changes in protected and unprotected kidneys at temperatures of 1 degree C and 25 degrees C.
abstract: In 110 canine kidneys, we examined the time course of energy rich phosphates, lactate, intrarenal ph and renal morphology with Euro-Collins- or with HTK-protection of Bretschneider and compared these findings with unprotected kidneys during complete ischemia at 1 degree C and at 25 degrees C. Both kidney protective solutions prolonged energy-rich phosphate-decline by a factor of 3-4 compared with that of unprotected kidneys. The lactate increase was greater in Euro-Collins-protected kidneys than in HTK-protected and in unprotected kidneys, leading to pH values of 6.5 in Euro-Collins and to 6.4 in unprotected kidneys after 24 hours, in contrast to a pH-value of 7.3 with HTK-protection. This may be the reason for structural deterioration seen in unprotected and in Euro-Collins-protected kidneys after 12, and 48 h of ischemia at 1 degree C, whereas in HTK-protected kidneys a sufficient preservation of structure can be seen. In one human kidney, protected with Euro-Collins-solution, we were able to show that at 1 degree C intrarenal pH and lactate accumulation is similar to the levels in canine kidneys. In Euro-Collins preserved kidneys lactate accumulation at 25 degrees C is even greater than at 1 degree C, leading to inhibition of energy metabolism and to structural deterioration, whereas HTK-solution, because of its high buffer concentration, is able to maintain ischemic metabolism leading to sufficient protection of intrarenal pH and of adenine nucleotides as well as structural protection at 1 degree C and at 25 degrees C.
mesh_terms: D000818:Animals; D004285:Dogs; D005260:Female; D005615:Freezing; D005947:Glucose; D006801:Humans; D006982:Hypertonic Solutions; D007668:Kidney / Q000378:metabolism / Q000473:pathology; D016030:Kidney Transplantation; D008297:Male; D008353:Mannitol; D009926:Organ Preservation; D011189:Potassium Chloride; D011343:Procaine; D013997:Time Factors
chemical_list: C039984:Bretschneider cardioplegic solution; C037096:Euro-Collins' solution; D006982:Hypertonic Solutions; D008353:Mannitol; D011343:Procaine; D011189:Potassium Chloride; D005947:Glucose