In the human body, a protein carrier called SPNS2 transports S1P molecules from endothelial cells to rally immune cell response in infected organs and tissues, resulting in inflammation. By enlarging the entire SPNS2 structure using nanoparticles, the S1P molecules contained within can be viewed via cryogenic electron microscopy. Using this information, small molecules can be developed to inhibit this signalling pathway and treat inflammatory diseases.
Scientists at the National University of Singapore and colleagues in China have analysed the structure of the SPNS2 protein at an atomic level that could provide greater insights into how S1P signalling molecules are released to communicate with the immune cells to regulate inflammatory responses. Their findings are published in Cell Research.
“Seeing is believing. This work shows that SPNS2 is directly exporting S1P for signalling and it is possible to inhibit its transport function with small molecules. This work provides the foundation for understanding of how S1P is released by SPNS2 and how this protein function is inhibited by small molecules for treatment of inflammatory diseases,” said team leader Dr Nguyen Nam Long.
The SPNS2 protein allows the binding of the S1P signalling molecules to trigger the immune cells to leave the lymph nodes and induce inflammation in different parts of the body when needed.
Made up of amino acids, the SPNS2 protein is malleable enough to change its shape and structure to release the S1P signalling molecules through small cavities found within the protein.
Through the discovery of how the SPNS2 protein releases S1P molecules, the SPNS2 structure can be exploited for future drug development.
Similar to discovering how the shape of the lock looks like before the key can be designed, this finding sheds more light into how future drugs can be designed to better target the protein to increase drug efficacy.
This finding builds on previous research which found that deleting SPNS2 protein from a pre-clinical model effectively blocks the S1P signalling pathway so that the S1P signalling molecules are unable to be transported to prompt immune cells to leave the lymph node to induce inflammation.
Both SPNS2 protein and S1P signalling molecule are required for immune cell recruitment to inflammatory organs, which goes towards treating various inflammatory diseases.
“Using pre-clinical models, we have shown that targeting SPNS2 proteins in the body blocks inflammatory responses in disease conditions, such as multiple sclerosis. This work has provided us a possibility to inhibit its transport function with small molecules that will go a long way to treating inflammatory diseases more efficiently and effectively,” said Dr Nguyen.
Source: National University of Singapore, Yong Loo Lin School of Medicine
