We used PMA 50 ng/ml (Calbiochem, Billerica, MA) and 500 ng/ml ionomycin (Calbiochem) for C57Bl6/J derived T cells as per
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There might be some value to do a titration experiment as the genetic background of the mice you are using, the environment and the specific functional readout (certain cytokines, co-stimulatory molecules, proliferation) may all be somewhat affected by the concentration you are using.
Thank you for sharing your conditions and your suggestion! I will definitely do a titration experiment to optimize my experiment. Your reference and one above gives me a great idea of where I should be aiming for.