Effect of serum deprivation and LPS treatment on the expression levels of p-p38 and p-ERK in primary microglia. (A) Representative western blots and (B) densitometry analysis showed that serum deprivation significantly upregulated the levels of p-p38 and (C) p-ERK after 1 h. n=3. *P<0.05, **P<0.01, ***P<0.001. LPS, lipopolysaccharide; p-, phospho; ERK, extracellular signal-regulated kinase.