  In a model with a gauge group $SU(3)_H\otimes G_{SM}$, where $SU(3)_H$ is a
horizontal symmetry and $G_{SM}=SU(3)_C\otimes SU(2)_L\otimes U(1)_Y$ is the
standard model, we propose a radiative mechanism of mass generation mediated by
the $SU(3)_H$ gauge bosons for the light fermions, meanwhile the masses of the
heaviest family are generated by the implementation of see-saw mechanisms with
the introduction of vectorial fermions.
