RESUMO
3D printed biomaterials are increasingly used in cell cultures and drug screens. Given the ease of creating artificial tissues, will this technique revolutionize biomedicine and organ implants in the future?
Assuntos
Materiais Biocompatíveis/química , Técnicas de Cultura de Células , Impressão Tridimensional , Alicerces Teciduais/química , Animais , Fenômenos Biomecânicos , Técnicas de Cultura de Células/instrumentação , Humanos , Engenharia Tecidual/instrumentaçãoRESUMO
Microtubule structure and functions have been widely studied in vitro and in cells. Research has shown that cysteines on tubulin play a crucial role in the polymerization of microtubules. Here, we show that blocking sulfhydryl groups of cysteines in taxol-stabilized polymerized microtubules with a commonly used chemical crosslinker prevents temporal end-to-end annealing of microtubules in vitro. This can dramatically affect the length distribution of the microtubules. The crosslinker sulfosuccinimidyl 4-(N-maleimidomethyl)cyclohexane-1-carboxylate, sulfo-SMCC, consists of a maleimide and an N-hydroxysuccinimide ester group to bind to sulfhydryl groups and primary amines, respectively. Interestingly, addition of a maleimide dye alone does not show the same interference with annealing in stabilized microtubules. This study shows that the sulfhydryl groups of cysteines of tubulin that are vital for the polymerization are also important for the subsequent annealing of microtubules.
Assuntos
Maleimidas/química , Microtúbulos/efeitos dos fármacos , Paclitaxel/química , Animais , Antineoplásicos Fitogênicos/química , Cisteína/química , Ésteres , Microtúbulos/química , Polímeros/química , Succinimidas/química , Suínos , Tubulina (Proteína)/químicaRESUMO
Cancer is a disease of uncontrolled cell proliferation causing approximately 13% of deaths worldwide. Cancer cell mechanics is currently an important topic of investigation in cancer diagnostics as a possible tool to distinguish malignant cells from normal cells in addition to increasing our understanding of pathophysiology of the disease. Our study, based on Atomic Force Microscopy (AFM) measurements on cells, shows that malignant thyroid cells are 3- to 5-fold softer in comparison to primary normal thyroid cells depending on duration between cell seeding and AFM experiments. These results reveal cultivation period as an important factor that influences cell mechanics and which must be considered when comparing cells. Investigation of actin cytoskeleton by fluorescent labelling revealed differences in organization of actin between malignant and normal thyroid cells, which may be directly contributing to alteration of cell mechanics in cancer cells.
