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In this paper, we analyse a Mehler&-Heine formula and the behaviour of zeros of orthogonal polynomials associated with a symmetrization process of Laguerre&-Sobolev-type orthogonal polynomials. More precisely, the limit of these zeros, their monotonicity as well as their dependence of the masses are obtained. In such a way, we obtain a natural generalization of the results given in Alfaro et al. [Asymptotic for a generalization of Hermite polynomials, Asympt. Anal. 66 (2010), pp. 103&-117].