  With the chiral quark model, we have calculated the axial charges of the
pentaquark states with $(I,I_3)=(\frac{1}{2},\frac{1}{2})$ and
$J^{P}=\frac{1}{2}^{\pm},\frac{3}{2}^{\pm},\frac{5}{2}^{\pm}$. The $P_c$ states
with the same $J^P$ quantum numbers but different color-spin-flavor
configurations have very different axial charges, which encode important
information on their underlying structures. For some of the
$J^{P}=\frac{3}{2}^{\pm}$ or $\frac{5}{2}^{\pm}$ pentaquark states, their axial
charges are much smaller than that of the proton.
