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Most malignant tissues showed moderate cytoplasmic, membranous and/or nuclear positivity. Occasional cases of malignant melanomas, malignant gliomas and lung cancers showed strong immunoreactivity. Malignant carcinoids along with several cases of endometrial and testicular malignancies were negative.
BPNT1, also called bisphosphate 3-prime-nucleotidase, or BPntase, is a member of a magnesium-dependent phosphomonoesterase family. Lithium, a major drug used to treat manic depression, acts as an uncompetitive inhibitor of BPntase. The predicted human protein is 92% identical to mouse BPntase. BPntase's physiologic role in nucleotide metabolism may be regulated by inositol signaling pathways. The inhibition of human BPntase may account for lithium-induced nephrotoxicity. [provided by RefSeq, Jul 2008]