The metastatic potential of rat prostate tumor variant R3327‐MatLyLu is correlated with an increased activity of N‐acetylglucosaminyl transferase III and V

Enzyme activities of N-acetylglucosaminyltransferase (GlcNAc-Tase) I-V involved in N-linked complex-type carbohydrate synthesis were determined in a non-metastatic hormone-dependent rat prostate tumor (R3327-H) and a related, hormone-independent variant metastasizing to lymph nodes and lungs (R3327-MatLyLu). In the metastasizing variant a significantly increased activity of both GlcNAc-Tase III and GlcNAc-Tase V was observed, whereas the activities of GlcNAc-Tase I and II were essentially unchanged. The increase in activity of GlcNAc-Tase III is particularly noteworthy since it indicates that elevated expression of this enzyme cannot be considered as an exclusive marker of hepatic malignancy.