Authors
Grosso, A., Cucuzza, S., Gambs, E., Lapointe, T., Huynh, T., Kuzu, G., King, F., Ng, K., Shi, J., Vogel, M., Gerwin, N., Halleux, C., Fornaro, M.
Abstract
Osteoarthritis (OA) is characterized by cartilage breakdown, extracellular matrix remodeling, and synovial inflammation. Dysregulated integrin 5{beta}1 signaling and fibronectin fragmentation are key drivers of OA progression. We found that in ihMSC, LNA043, Full length ANGPTL3 (FL-ANGPTL3, and C-terminal fibronogen-tlike domain of ANGPTL3 (C-ANGPTL3) interacted with both integrin 5{beta}1 and fibronectin, consistent with a multivalent binding mode supported by AlphaFold based structural predictions. FL-ANGPTL3 supported ihMSC adhesion and induced human monocyte migration, with both effects being dependent on integrin {beta}1. C-ANGPTL3 alone was sufficient to mediate these effects, although with reduced efficacy compared to the full-length protein. In contrast, LNA043 did not support ihMSC adhesion but retained integrin {beta}1-dependent monocyte migratory activity, defining a more selective functional profile and indicating that further truncation modulates downstream responses without abolishing integrin engagement. To further explore the biology of ANGPTL3 and the mechanism of action of LNA043 we employed a targeted RASL Seq profiling. We found that both FL- and C-ANGPTL3, but not LNA043, induced broad transcriptional reprogramming and counter regulated fibronectin fragment-driven inflammatory signaling in monocytes. We uncovered a role for ANGPTL3 in fibronectin-integrin 5{beta}1 signaling and showed that LNA043 preserves this interaction while uncoupling it from strong immune responses.
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bioRxiv
The authors list and abstract were imported from bioRxiv on 17 Sep 2026.
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