  We study some aspects when one consider the existence of one extra-dimension
in addition to a non-commutative space-time. We present here two different
examples, where the first one provides a scenario were it is possible to relate
the variations on the compactification radius $L$ and the non-commutative
parameter $\theta^{\mu\nu}$, recovering the usual Minkowski $(3+1)D$ metric
and, in the other one, we can set a simple relationship between this radius and
$\theta$, the non-commutative parameter, for the gravitational potential
between a point particle and a straight cosmic string in $(2+1)D$.

High Energy Physics - Theory;General Relativity and Quantum Cosmology