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Renin in acute myeloid leukaemia blasts

Hypokalaemia is a clinical phenomenon in patients with acute myeloid leukaemia (AML) to which activation of the renin–angiotensin system (RAS) may contribute. Recently monocytes were found to express renin, the key initializing enzyme of the RAS. By RT/PCR, transcripts for renin were detected in four of 18 bone marrow samples from patients with AML. Three leukaemic cell lines, isolated monocytes, bone marrow stromal cells and 25 peripheral blood and 24 bone marrow samples of normal controls were negative for renin transcripts. In view of the importance of local RAS in other tissues, the expression of renin in the bone marrow of AML patients warrants further investigation.