The C2C12 cell line, a mouse myoblast line, was used here to study the regulatory factors in myogenic differentiation. After cultured in differentiation medium for 3 days, these cells differentiated into myotubes (Green) containing multiple nuclei (Blue). The C2C12 cells stably expressing FLAG-tagged rapamycin-resistant, kinase-inactive (RR/KI) mTOR were induced to differentiation in the presence of 50nM rapamycin for 3 days. The C2C12 cells differentiated, but arrested at the nascent myotube stage. This image is the control of different treatments in Figure 9B from JCB 189: 1157-1169, 2010. See also CIL: 13593, 13594, 13601.
The image was taken by leica DMI 4000B microscope equipped with a QImaging RETIGA Exi camera and Leica 10X/0.22 lens. Myosin heavy chain (MHC) expressed in myotubes was labeled by MF-20 mouse antibody followed by FITC-anti-mouse IgG secondary antibody. Nuclei were stained by DAPI. MHC and nuclei were pseudocolored in green and blue, respectively.