RESUMO
BACKGROUND: Fused filament fabrication 3-D printing with acrylonitrile butadiene styrene (ABS) filament emits ultrafine particulates (UFPs) and volatile organic compounds (VOCs). However, the toxicological implications of the emissions generated during 3-D printing have not been fully elucidated. AIM AND METHODS: The goal of this study was to investigate the in vivo toxicity of ABS-emissions from a commercial desktop 3-D printer. Male Sprague Dawley rats were exposed to a single concentration of ABS-emissions or air for 4 hours/day, 4 days/week for five exposure durations (1, 4, 8, 15, and 30 days). At 24 hours after the last exposure, rats were assessed for pulmonary injury, inflammation, and oxidative stress as well as systemic toxicity. RESULTS AND DISCUSSION: 3-D printing generated particulate with average particle mass concentration of 240 ± 90 µg/m³, with an average geometric mean particle mobility diameter of 85 nm (geometric standard deviation = 1.6). The number of macrophages increased significantly at day 15. In bronchoalveolar lavage, IFN-γ and IL-10 were significantly higher at days 1 and 4, with IL-10 levels reaching a peak at day 15 in ABS-exposed rats. Neither pulmonary oxidative stress responses nor histopathological changes of the lungs and nasal passages were found among the treatments. There was an increase in platelets and monocytes in the circulation at day 15. Several serum biomarkers of hepatic and kidney functions were significantly higher at day 1. CONCLUSIONS: At the current experimental conditions applied, it was concluded that the emissions from ABS filament caused minimal transient pulmonary and systemic toxicity.
Assuntos
Resinas Acrílicas/toxicidade , Poluição do Ar em Ambientes Fechados/efeitos adversos , Butadienos/toxicidade , Exposição por Inalação/efeitos adversos , Material Particulado/toxicidade , Poliestirenos/toxicidade , Impressão Tridimensional , Sistema Respiratório/efeitos dos fármacos , Compostos Orgânicos Voláteis/toxicidade , Resinas Acrílicas/farmacocinética , Aerossóis , Poluição do Ar em Ambientes Fechados/análise , Animais , Biomarcadores/metabolismo , Contagem de Células Sanguíneas , Líquido da Lavagem Broncoalveolar/química , Butadienos/farmacocinética , Citocinas/sangue , Masculino , Microscopia Eletrônica de Varredura , Estresse Oxidativo/efeitos dos fármacos , Tamanho da Partícula , Material Particulado/análise , Material Particulado/farmacocinética , Poliestirenos/farmacocinética , Ratos Sprague-Dawley , Sistema Respiratório/metabolismo , Sistema Respiratório/ultraestrutura , Compostos Orgânicos Voláteis/análise , Compostos Orgânicos Voláteis/farmacocinéticaRESUMO
BACKGROUND/AIM: Platinum-based chemotherapy often fails due to its severe adverse effects. The aim of this study was to examine the adverse effects profile and efficacy of dicycloplatin and compare them to those of cisplatin and carboplatin. MATERIALS AND METHODS: Cystoscopy surveillance of the first American cancer patient treated with dicycloplatin was performed quarterly. In vitro and in vivo studies were conducted using immunoblotting and flow cytometry to assess immune status of spleen and bone marrow of mice treated with dicycloplatin, cisplatin and carboplatin. RESULTS: The American patient did not suffer clinically significant myelosuppression; dicycloplatin has sustained remission in this patient to date. Experimental studies showed that dicycloplatin is less toxic to bone marrow and spleen of mice than cisplatin and carboplatin. CONCLUSION: Dicycloplatin is a promising drug in cancer chemotherapy with less aggressive side-effects than those typically associated with cisplatin and carboplatin. This is an important therapeutic advantage in cancer chemotherapy. Clinical investigation of dicycloplatin as an alternative to cisplatin or carboplatin is warranted.
