tetano
Editor, Senior Moderator
Sci Rep
. 2025 Sep 26;15(1):32998.
doi: 10.1038/s41598-025-17982-3. Discovery of novel disulfide-containing PD-1/PD-L1 inhibitor with in vivo influenza therapeutic efficacy
Yoshiyuki Hirata[SUP] 1 [/SUP], Kyoko Hayashi[SUP] 2 [/SUP], Takuma Kato[SUP] 1 [/SUP], Yasuo Nagaoka[SUP] 3 [/SUP], Mitsunobu Doi[SUP] 1 [/SUP], Shinichi Uesato[SUP] 4 [/SUP]
Affiliations
Monoclonal antibody-based immune checkpoint inhibitors, which have brought breakthrough effects in cancer treatments, are expected to assist in the treatment of viral diseases. However, antibody therapies may cause immune-related side effects, such as inflammation and pneumonia, due to cytokine storms. Small-molecule PD-1/PD-L1 inhibitors are an alternative to monoclonal antibody-based therapeutics. We have identified a novel small-molecule PD-1/PD-L1 inhibitor having a functional group (disulfide group), namely compound 2 (molecular weight: 456.6), from our library of sulfur-containing protein-protein interaction inhibitor compounds. Compound 2 selectively bound to PD-L1 over PD-1, with the dissociation rate constant (K[SUB]D[/SUB]) of 77.60 ± 4.44 nM (obtained by affinity analysis) and showed promising T cell activation recovery. A molecular docking simulation study between 2 and PD-L1 suggested that 2 binds to PD-L1 in a binding mode different from those of other small-molecule PD-L1/PD-1 inhibitors. Notably, oral administration of 2 to mice pre-infected with influenza A virus (A/NWS/33, H1N1 subtype) caused a significant increase in the neutralizing antibody titers, as well as recovery from influenza-induced pneumonia. Overall, 2 provides insight for the development of therapeutic drugs against early viral infections, with both virus titer-reducing and antibody titer-boosting effects. Moreover, 2 is widely used as a rubber peptizing agent in the production process of tires and other rubber products. Our findings may provide useful information for investigating its influence on living organisms.
. 2025 Sep 26;15(1):32998.
doi: 10.1038/s41598-025-17982-3. Discovery of novel disulfide-containing PD-1/PD-L1 inhibitor with in vivo influenza therapeutic efficacy
Yoshiyuki Hirata[SUP] 1 [/SUP], Kyoko Hayashi[SUP] 2 [/SUP], Takuma Kato[SUP] 1 [/SUP], Yasuo Nagaoka[SUP] 3 [/SUP], Mitsunobu Doi[SUP] 1 [/SUP], Shinichi Uesato[SUP] 4 [/SUP]
Affiliations
- PMID: 41006573
- DOI: 10.1038/s41598-025-17982-3
Monoclonal antibody-based immune checkpoint inhibitors, which have brought breakthrough effects in cancer treatments, are expected to assist in the treatment of viral diseases. However, antibody therapies may cause immune-related side effects, such as inflammation and pneumonia, due to cytokine storms. Small-molecule PD-1/PD-L1 inhibitors are an alternative to monoclonal antibody-based therapeutics. We have identified a novel small-molecule PD-1/PD-L1 inhibitor having a functional group (disulfide group), namely compound 2 (molecular weight: 456.6), from our library of sulfur-containing protein-protein interaction inhibitor compounds. Compound 2 selectively bound to PD-L1 over PD-1, with the dissociation rate constant (K[SUB]D[/SUB]) of 77.60 ± 4.44 nM (obtained by affinity analysis) and showed promising T cell activation recovery. A molecular docking simulation study between 2 and PD-L1 suggested that 2 binds to PD-L1 in a binding mode different from those of other small-molecule PD-L1/PD-1 inhibitors. Notably, oral administration of 2 to mice pre-infected with influenza A virus (A/NWS/33, H1N1 subtype) caused a significant increase in the neutralizing antibody titers, as well as recovery from influenza-induced pneumonia. Overall, 2 provides insight for the development of therapeutic drugs against early viral infections, with both virus titer-reducing and antibody titer-boosting effects. Moreover, 2 is widely used as a rubber peptizing agent in the production process of tires and other rubber products. Our findings may provide useful information for investigating its influence on living organisms.