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Fluorine Substitution Tunes the Nanofiber Chirality of Supramolecular Hydrogels to Promote Cell Adhesion and Proliferation

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Abstract

Fluorine atoms confer desirable biophysical, chemical, and biological properties to peptides/proteins by participating in various intermolecular interactions with their environment, but they are rarely used to control supramolecular chirality and functional. Herein, to identify the effects of fluorine substitution on the chirality and function of supramolecular assemblies, C2-symmetric benzene-paradicarboxamide-based phenylalanine (phe) derivatives and three monofluorinated variants that had a single fluorine atom on their benzyl side chain in either the ortho, meta, or para position were synthesized. The experimental and theoretical results clearly show that the resulting assembled fibrils were supported by multiple interactions, including hydrogen bonding, π–π stacking and C/O–H···F–CAr interactions. Compared to nonfluorinated analogs, fluorine and its ring position on the aromatic side chain dictated the type and strength of the F···H interaction and then induced changes in supramolecular chirality and fiber morphology. Further studies on cell behavior showed that the order of positive interaction between high-order supramolecular chirality (M, P) and molecular chirality (L, D) on cell proliferation and viability is LM > DM > LP > DP. These findings provide a protocol for leveraging fluorine atoms and their positional dependence on directing chiral nanostructures with desirable handedness and creating fluorinated supramolecular hydrogels as extracellular matrix-mimetic scaffolds for cell culture and regenerative medicine.

Graphical Abstract

The helical chirality can be reversed by introducing a fluorine atom into the supramolecular system and changing its ring position on the aromatic side chain, which are attributed to fluorous interactions dictate the helical orientation and morphology of supramolecular assemblies.

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Acknowledgements

H. J. Lu and Y. Zhao contributed equally to this work. This work was supported by the National Natural Science Foundation of China (Nos. 52003072, 51833006), Chinese Postdoctoral Science Foundation (2021M690891), the GHfund B (20220202, ghfund202202021124), Key Scientific and Technological Project of Henan Province 222102310494, and Startup Fund for Young Faculty at SJTU.

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  1. Huijie Lu and Yu Zhao have contributed equally to the work.

Authors and Affiliations

  1. Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng, 475004, China

    Huijie Lu, Shuchun Qin, Yanyan Zhang, **ying Liu, Jian Zhang & Weili Zhao

  2. School of Pharmacy, Institutes of Integrative Medicine, Fudan University, Shanghai, 201203, China

    Weili Zhao

  3. State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yu Zhao & Chuanliang Feng

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  1. Huijie Lu
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Lu, H., Zhao, Y., Qin, S. et al. Fluorine Substitution Tunes the Nanofiber Chirality of Supramolecular Hydrogels to Promote Cell Adhesion and Proliferation. Adv. Fiber Mater. 5, 377–387 (2023). https://doi.org/10.1007/s42765-022-00232-w

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