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We explore the effects of breaking and restoration of chiral and axialsymmetries using an extended three-flavor Nambu-Jona-Lasinio model thatincorporates explicitly the axial anomaly through the 't Hooft interaction. Weimplement a temperature (density) dependence of the anomaly coefficientmotivated by lattice results for the topological susceptibility. The spectrumof scalar and pseudoscalar mesons is analyzed bearing in mind theidentification of chiral partners and the study of its convergence. We alsoconcentrate on the behavior of the mixing angles that give us relevantinformation on the issue under discussion. The results suggest that the axialpart of the symmetry is restored before the possible restoration of the fullU(3)$\otimes$U(3) chiral symmetry might occur.Comment: 9 pages, 5 figures. Talk given at Joint Meeting  Heidelberg-Liege-Paris-Rostock (HLPR 2004), Spa, Belgium, 16-18 Dec 200

Restoration of UA(1) symmetry and meson spectrum in hot or dense matter