Proliferating cell nuclear antigen (PCNA) is a nuclear protein maximally elevated in the S phase of proliferating and transformed cells and is recognized by the monoclonal antibody PC-10 in paraffin tissue sections. The liver regenerative process after partial hepatectomy in rats was estimated with the in vivo incorporation of [3H]thymidine into liver DNA and the liver thymidine kinase activity. The expression of PCNA in rat liver after partial hepatectomy was performed by immunohistochemical staining with PC-10 in paraffin embedded tissues, at different time intervals up to 240 hr. Proliferating cell nuclear antigen expression, [3H]thymidine incorporation into DNA, and liver thymidine kinase activity exhibited marked oscillations during the liver regenerative process. A close relationship was demonstrated among DNA synthesis, thymidine kinase activity, and PC-10 score. Our results suggest that PC-10 monoclonal antibody may be used as a worthwhile proliferation index in the evaluation of the rate of liver regeneration in rats.
Specimens from 75 cases of prostatic adenocarcinoma of different M.D. Anderson degrees of malignancy were stained immunohistochemically for neuron-specific enolase (NSE), prostatic specific antigen (PSA) and prostatic acid phosphatase (PAP). None of these tumors presented on hematoxylineosin sections any features suggesting neuroendocrine differentiation; nevertheless, 18.7% of the tumors were at least focally NSE positive. Because of the synchronous antigenic expression of the NSE-positive cells to PSA and PAP, the authors suggest that prostatic exocrine and neuroendocrine cells derive from a common precursor stem cell. The possibility of a more aggressive biological behavior of these tumors in comparison to the conventional carcinomas is discussed. The probable clinical necessity for a combined therapeutic approach is also investigated.
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