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Fluorine functionalized graphene quantum dots as inhibitor against hIAPP amyloid aggregation.

Fluorine functionalized graphene quantum dots as inhibitor against hIAPP amyloid aggregation.
Author Information (click to view)

Yousaf M, Huang H, Li P, Wang C, Yang Y,


Yousaf M, Huang H, Li P, Wang C, Yang Y, (click to view)

Yousaf M, Huang H, Li P, Wang C, Yang Y,

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ACS chemical neuroscience 2017 02 23() doi 10.1021/acschemneuro.7b00015
Abstract

Fibrillar deposits of the human islet amyloid polypeptide (hIAPP) is considered as a root of Type II diabetes mellitus. Fluorinated graphene quantum dots (FGQDs) are new carbon nanomaterials with unique physicochemical properties containing highly electronegative F atoms. Herein we report a single step synthesis method of FGQDs with an inhibitory effect on aggregation and cytotoxicity of hIAPP in vitro. Highly fluorescent and water dispersible FGQDs, less than 3 nm in size were synthesized by the microwave-assisted hydrothermal method. Efficient inhibition capability of FGQDs to amyloid aggregation was demonstrated in manner. The morphologies of hIAPP aggregates were observed to change from the entangled long fibrils to short thin fibrils and amorphous aggregates in the presence of FGQDs. In thioflavin T fluorescence analysis the inhibited aggregation with prolonged lag time and the reduced fluorescence intensity at equilibrium were observed when hIAPP was incubated together with FGQDs. Circular dichroism spectrum results reveal that FGQDs could inhibit conformational transition of the peptide from native structure to β-sheets. FGQDs could also rescue the cytotoxicity of INS-1 induced by hIAPP in dose dependent manner. This study could be beneficial for design and preparation of inhibitors for amyloids, which is important for prevention and treatment of amyloidoses.

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