Ectopic Pax7 increases MyoD expression in Pax7-null myogenic cells.

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Ectopic Pax7 increases MyoD expression in Pax7-null myogenic cells. Ectopic Pax7 increases MyoD expression in Pax7-null myogenic cells. YMCA cells, a subclone of C2C12, did not contain detectable levels of Pax7 (a). Cycling YMCA cells were infected with pMSCV-IRES-eGFP or pMSCV-Pax7-IRES-eGFP, left for 48 hours, fixed and immunostained. Infection with pMSCV-Pax7-IRES-eGFP resulted in Pax7 protein in nuclei of YMCA cells (b). Infected cultures were also co-immunostained for eGFP and BrdU (c,d) or eGFP and MyoD (e,f). Random fields were then selected and the total number of cells containing eGFP and either BrdU (g) or MyoD determined (h). The presence of Pax7 from pMSCV-Pax7-IRES-eGFP did not significantly affect the number of cells able to incorporate BrdU compared with pMSCV-IRES-eGFP-infected or control cells (g). However, the presence of Pax7 significantly increased the number of YMCA cells expressing MyoD when compared with cells infected with control vector or non-infected cells (h). Values are from at least eight random fields and are expressed as population mean ± s.e.m., where *P<0.05 denotes significant difference from non-infected cells using Student's t-test. Bar, 30 μm. Peter S. Zammit et al. J Cell Sci 2006;119:1824-1832 © The Company of Biologists Limited 2006