  We consider an interacting system of spinor and electromagnetic field,
explicitly depending on the electromagnetic potentials, i.e., interaction with
broken gauge invariance. The Lagrangian for interaction is chosen in such a way
that the electromagnetic field equation acquires an additional term, which in
some cases is proportional to the vector potential of the electromagnetic
field. This equation can be interpreted as the equation of motion of photon
with induced non-trivial rest-mass. This system of interacting spinor and
scalar fields is considered within the scope of Bianchi type-I (BI)
cosmological model. It is shown that, as a result of interaction the
electromagnetic field vanishes at $t \to \infty$ and the isotropization process
of the expansion takes place.
