Growth regulation and cellular changes during differentiation of human prostatic cancer LNCaP cells as induced by T lymphocyte-conditioned medium

Experimental Cell Research
T C HsiehJ W Chiao

Abstract

Human prostatic epithelial cells from an androgen-dependent LNCaP cell line were examined in response to conditioned medium (CM) derived from phytohemagglutinin (PHA)-stimulated lymphocytes. Addition of CM caused a greater than 70% reduction of cell proliferation by cell counting and cell cycle. These cells showed G1 phase arrest and the clonogenicity was reduced. The growth-modulating effect was dose-dependent and not due to cell lysis or apoptosis. The binding of androgen to androgen receptor on these cells showed approximately 50% reduction, underlining a proliferation reduction mechanism. The prostate-specific antigen (PSA) was downregulated to approximately 75% during the process. Cell morphology showed dendritic processes extending from cytoplasm and other neuroendocrine cell characteristics. The expression of several cytoskeleton and intracellular proteins increased as determined by immunostaining on slides and by ELISA procedures. These included vimentin, correlating to cell shape changes, cytokeratins 8 and 18, associated with differentiated cell types of prostate epithelia, and neuron-specific enolase and serotonin, associated with neuroendocrine cells. From these cellular changes, we can infer that the cell growth wa...Continue Reading

Citations

Feb 5, 1997·Journal of the National Cancer Institute·M J Campbell, H P Koeffler
Nov 14, 2000·Microscopy Research and Technique·Z CuligH Klocker
Mar 25, 2017·International Braz J Urol : Official Journal of the Brazilian Society of Urology·Benjamin A ShererLeslie Allan Deane

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