title: Plasma met-enkephalin and leu-enkephalin in chronic renal failure.
abstract: Plasma met-enkephalin and leu-enkephalin has been measured in a group of 28 patients with chronic renal failure, to discover whether these opioids are affected by standard haemodialysis and haemofiltration. Met-enkephalin was markedly higher (P less than 0.001) in uraemic patients than in a group of 13 normal subjects, and was directly related to plasma creatinine (r = 0.60; P less than 0.01) and to plasma urea (r = 0.36; P = 0.06). In contrast, leu-enkephalin was suppressed in uraemic patients (P less than 0.001). Met-enkephalin fell slightly but significantly (P less than 0.02) after both haemodialysis and haemofiltration; however, on average it remained at concentrations four times higher than normal. No changes in plasma leu-enkephalin were observed after haemodialysis and haemofiltration. The cause(s) of the altered plasma concentrations of these opioid substances remains to be clarified.
mesh_terms: D000328:Adult; D001769:Blood; D004743:Enkephalin, Leucine / Q000097:blood*; D004744:Enkephalin, Methionine / Q000097:blood*; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000628:therapy; D008875:Middle Aged; D006435:Renal Dialysis; D014462:Ultrafiltration
chemical_list: D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine