The partial dependency of human prostatic growth factor on steroid hormones in stimulating thymidine incorporation into DNA.

Growth factors stimulating DNA synthesis in mouse 3T3, human DU145, and LNCaP were partially purified from human benign hyperplastic and cancerous prostates. These factors have a high affinity for heparin sepharose and are eluted from the heparin-sepharose column, at 1.2 to 1.

Hormonal control of pancreatic cancer growth.

The effects of epidermal growth factor (EGF) and somatostatin-14 (SS) on growth of Mia PaCa-2 cells in cell culture were examined. EGF had no effect on cell growth in sera containing media but significantly increased growth in sera-free media. The effect of EGF was complete within 18 h.

Stimulation by somatostatin of dephosphorylation of membrane proteins in pancreatic cancer MIA PaCa-2 cell line.

A membrane receptor and a cytosolic receptor for somatostatin were found in a human undifferentiated pancreatic cancer cell line (MIA PaCa-2). Binding of somatostatin to this membrane receptor activates dephosphorylation of a phosphotyrosyl-membrane protein whose phosphorylation was promoted by epidermal growth factor (EGF). Vanadate, a purported inhibitor of dephosphorylation, interferes with the action of somatostatin.

An inhibitor of urokinase and tissue plasminogen activators in Dunning R3327H prostate tumors of rats treated with D-Trp6-LH-RH.

The antifibrinolytic activity of cytosol from Dunning R3327H rat prostate tumors was studied. The prostate tumors from rats treated with D-Trp6-LH-RH had 2.5 times lower plasminogen activator activity than tumors from untreated rats.

Plasminogen activator and nuclear androgen receptor in rat prostate tumors after treatment with D-Trp-6-LH-RH.

Plasminogen activator and nonspecific proteolytic activity in transplantable squamous cell rat prostate tumor 11095 were measured by a fluorometric method. Prostate tumors which regressed after treatment with D-Trp-6-LH-RH had 10-fold lower concentrations of plasminogen activator(s) per mg of protein, and considerably higher levels of nuclear androgen receptor. On the other hand, there were no significant changes in nonspecific proteolytic activity in tumor tissue between untreated and D-Trp-6-LH-RH treated rats.