3 years ago

The cytotoxic effect of TiF<sub>4</sub> and NaF on fibroblasts is influenced by the experimental model, fluoride concentration and exposure time

John Michael Edwardson, Ana Carolina Magalhães, Priscila Maria Aranda Salomão, Luana Polioni Al-Ahj, Pia Jeggle, Kellen Cristina da Silva Gasque, Rodrigo Cardoso de Oliveira, Marilia Afonso Rabelo Buzalaf, Paula Danielle Rodrigues, Flávia Amadeu de Oliveira

by Priscila Maria Aranda Salomão, Flávia Amadeu de Oliveira, Paula Danielle Rodrigues, Luana Polioni Al-Ahj, Kellen Cristina da Silva Gasque, Pia Jeggle, Marilia Afonso Rabelo Buzalaf, Rodrigo Cardoso de Oliveira, John Michael Edwardson, Ana Carolina Magalhães

Objective

Titanium tetrafluoride (TiF4) has shown promising effect in preventing tooth lesions. Therefore, we compared the cytotoxicity of TiF4 with sodium fluoride (NaF) (already applied in Dentistry) considering different fluoride concentrations, pH values and experimental models.

Materials and methods

Step 1) NIH/3T3 fibroblasts were exposed to mediums containing NaF or TiF4 (from 0.15 to 2.45% F), both at native and adjusted pH, for 6 h. Step 2) NIH/3T3 were exposed to NaF or TiF4 varnishes with 0.95, 1.95 or 2.45% F (native pH), for 6, 12 or 24 h. We applied MTT (1st and 2nd steps) and Hoescht/PI stain (2nd step) assays. Step 3) NIH/3T3 were exposed to NaF or TiF4 varnish (2.45% F), at native pH, for 6 or 12 h. The cell stiffness was measured by atomic force microscopy (AFM).

Results

Step 1) All cells exposed to NaF or TiF4 mediums died, regardless of the F concentration and pH. Step 2) Both varnishes, at 1.90 and 2.45% F, reduced cell viability by similar extents (33–86% at 6 h, 35–93% at 12 h, and 87–98% at 24 h) compared with control, regardless of the type of fluoride. Varnishes with 0.95% F did not differ from control. Step 3) TiF4 and NaF reduced cell stiffness to a similar extent, but only TiF4 differed from control at 6 h.

Conclusions

Based on the results of the 3 experimental steps, we conclude that TiF4 and NaF have similar cytotoxicity. The cytotoxicity was dependent on F concentration and exposure time. This result gives support for testing the effect of TiF4 varnish in vivo.

Publisher URL: http://journals.plos.org/plosone/article

DOI: 10.1371/journal.pone.0179471

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