Synthetic polypeptides inhibit nucleic acid-induced inflammation in autoimmune diseases by disrupting multivalent TLR9 binding to LL37-DNA bundles
Complexes of extracellular nucleic acids (NAs) with endogenous proteins or peptides, such as LL37, break immune balance and cause autoimmune diseases, whereas NAs with arginine-enriched peptides do not. Inspired by this, we synthesize a polyarginine nanoparticle PEG- TK -NP Arg , which effectively i...
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Veröffentlicht in: | Nature nanotechnology 2024-11, Vol.19 (11), p.1745-1756 |
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Sprache: | eng |
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Zusammenfassung: | Complexes of extracellular nucleic acids (NAs) with endogenous proteins or peptides, such as LL37, break immune balance and cause autoimmune diseases, whereas NAs with arginine-enriched peptides do not. Inspired by this, we synthesize a polyarginine nanoparticle PEG-
TK
-NP
Arg
, which effectively inhibits Toll-like receptor-9 (TLR9) activation, in contrast to LL37. To explore the discrepancy effect of PEG-
TK
-NP
Arg
and LL37, we evaluate the periodic structure of PEG-
TK
-NP
Arg
-NA and LL37-NA complexes using small-angle X-ray scattering. LL37-NA complexes have a larger inter-NA spacing that accommodates TLR9, while the inter-NA spacing in PEG-
TK
-NP
Arg
-NA complexes mismatches with the cavity of TLR9, thus inhibiting an interaction with multiple TLR9s, limiting their clustering and damping immune induction. Subsequently, the inhibitory inflammation effect of PEG-
TK
-NP
Arg
is proved in an animal model of rheumatoid arthritis. This work on how the scavenger-NA complexes inhibit the immune response may facilitate proof-of-concept research translating to clinical application.
This study shows how amino acid composition and topology in synthetic polypeptides affect anti-inflammatory effects and how scavenging debris nucleic acids inhibits inflammation and relieves symptoms of autoimmune diseases. |
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ISSN: | 1748-3387 1748-3395 1748-3395 |
DOI: | 10.1038/s41565-024-01759-2 |