Involvement of PKC-mediated and Ca-dependent signals in the induction of telomerase activity. Purified T and B cells from the same donor were stimulated in vitro with PDB (20 ng/mL), Ca ionophore (0.1 μg/mL), or both of them for 2 days. The response of B cells, stimulated with soluble anti-IgM Ab plus anti-CD40 MoAb was compared parallel.