1. Tumour extracts from two patients with humoral hypercalcaemia of malignancy contained material which stimulated adenylate cyclase in chick renal membranes and in rat osteosarcoma cells.

2. Adenylate cyclase-stimulating activity in each system was inhibited by a specific parathyroid hormone (PTH) antagonist.

3. Studies in two HPLC systems suggested that the adenylate cyclase-stimulating factors extracted from these tumours differed from each other and from synthetic human parathyroid hormone 1–34.

4. The presence of similar PTH-like adenylate cyclase stimulating material(s) in oncogenic osteomalacia suggests that adenylate cyclase stimulating factor(s) may not be the direct or the sole cause of hypercalcaemia.

Keywords:
adenylate cyclase, hypercalcaemia, hypernephroma, melanoma, parathyroid hormone
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© 1986 The Biochemical Society and the Medical Research Society
1986
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