  Instanton liquid model being effective model of the QCD vacuum describes well
the hadrons at low as well at intermediate energies. Thus, contact with
perturbative QCD results is possible providing the unique information about the
quark-gluon distribution functions in the QCD vacuum and hadrons at low energy
normalization point. As an illustrative example we consider the pion transition
form factor for the process $\gamma ^*\gamma^*\to \pi^0$ at space-like values
of photon momenta. The leading and next-to-leading order power asymptotics of
the form factor and the relation between the light-cone pion distribution
amplitudes of twists 2 and 4 and the dynamically generated quark mass are
found.
