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Designing viscoelastic mucin-based hydrogels

Joyner, K.; Song, D.; Hawkins, R.; Silcott, R.; Duncan, G.

2019-06-04 bioengineering
10.1101/656801 bioRxiv
Show abstract

We report the design of a mucin hydrogel created using a thiol-based cross-linking strategy. By using a cross-linking reagent capable of forming disulfide linkages between mucins, the mucin-based hydrogels possess viscoelastic properties comparable to native mucus as measured by bulk rheology. We confirmed disulfide cross-links mediate gel formation in our system using chemical treatments to block and reduce cysteines where we found mucin hydrogel network formation was inhibited and disrupted, respectively. Particle tracking microrheology was used to investigate the kinetics and evolution of microstructure and viscoelasticity within the hydrogel as it formed. We found that the rate of gel formation could be tuned by varying the mucin to crosslinker ratio, producing network pore sizes in the range measured previously in human mucus. The results of this work provide a new, simple method for creating mucin hydrogels with physiologically relevant properties using readily available reagents.

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