CS abundance is regulated by HYAL1 expression levels.
A and B, constitutive OE of HYAL1 in C2C12 cells abrogated the accumulation of CS on day 5 in DM culture (A), whereas its knockdown (KD) caused elevated CS levels on day 8 (B) (n = 6, parental cells; n = 3, OE#1; n = 4, OE#5; n = 6, KD#1; n = 6, KD#8; at each time point, results are expressed as means ± S.D.; *, p < 0.05; **, p < 0.005; ***, p < 0.001). C and D, HA contents were essentially unaltered in both HYAL1 OE (C) and KD (D) cells (n = 4, parental cells; n = 3, OE#1; n = 4, OE#5; n = 5, KD#1; n = 5, KD#8; at each time point, results are expressed as means ± S.D.).