Doxycycline inhibited staurosporine-induced apoptosis in myogenic C2C12 cells. A. Myoblasts of the mouse C2C12 cell line were either untreated, treated with 100 nM staurosporine (+STS), or treated with both 100 nM staurosporine and 2μM doxycycline (+STS, +Dox) after a 3h pre-incubation with 2 μM doxycycline. Doxycycline decreased the number of abnormally shaped nuclei (indicative of apoptosis) in staurosporine-treated cultures. B. Quantitative analysis of experiments performed as in panel A demonstrated that doxycycline decreased the percentage of abnormal, apoptotic nuclei induced by staurosporine. Error bars = SE, n=4. *P < 0.05 by t-test.