Abstract A005: Synergistically Engaging a b-Selective IL-2 Agonist with PD1/PDL-1 Blockade in a Bifunctional Superkine, MDNA223
Notice bibliographique
Résumé
Abstract Introduction: Combination treatment with a long-acting IL-2 superkine (MDNA109FEAA-Fc; aka MDNA19) and anti-PD1 or anti-CTLA4 has shown clear evidence of synergy in blunting tumor growth. To further leverage this synergism, we designed MDNA223, a BiSKIT (Bifunctional SuperKine for ImmunoTherapy) comprising MDNA109FEAA with enhanced affinity for IL-2Rb and no binding to IL-2Ra, fused to either human or mouse anti-PD1. We present in vitro and in vivo characterization of MDNA223 and demonstrate its enhanced IL-2R agonism and effective PD1/PDL-1 blockade in multiple “hot” and “cold” syngeneic tumor models. Experimental Procedure: In vitro studies included human PBMCs and cell-based reporter assays. In vivo studies were conducted in CT26, B16F10, E0771 and TRAMP-C1 tumor models by intraperiotonneal (IP) administration. Intratumoral treatment was performed in a CT26 bilateral tumor model with or without a STING agonist. Analysis of tumor infiltrating lymphocytes (TILs) was performed using flow cytometry. Results: In studies with human PBMCs, MDNA223 showed increased p-STAT5 signaling in CD8+ T cells and reduced activity in Tregs compared to rhIL-2, consistent with its enhanced receptor selectivity. MDNA223 and anti-PD1 were similarly potent at PD1/PDL-1 blockade in a cell-based reporter assay. In mice, MDNA223 induced proliferation (based on Ki67 expression) and expansion of peripheral CD8+ T cells for over 7 days. IP treatment with MDNA223 resulted in significantly greater inhibition of CT26, B16F10, E0771 and TRAMP-C1 tumor growth when compared to combination of MDNA19 with anti-PD1 at equimolar dosage. This observation is consistent with the proposed cis-binding mechanism of MDNA223 to both, IL-2R and PD1 on the same effector immune cell. In a bilateral CT26 tumor model, IT treatment with MDNA223 not only inhibited the treated tumor but also exhibited an abscopal effect by slowing growth of the untreated tumor implanted on the opposite flank. TILs analysis of B16F10 melanoma following a single dose of MDNA223 showed increased infiltration of CD8+ T cells over Tregs compared to single agent treatment with MDNA19 or anti-PD1 as well as their combination. Treatment with MDNA223 also resulted in a larger population of functional effector CD8+ T cells expressing low levels of the Tim-3 exhaustion marker and high levels of the cytotoxic Granzyme-B protease. Conclusion: MDNA223 demonstrated superior therapeutic activity over the combination of MDNA19 and anti-PD1 in both immunologically ‘hot’ (CT26) and ‘cold’ (B16F10, E0771 and TRAMP-C1) tumor models. Additional studies with variants of MDNA223 capable of tumor selective targeting and/or conditional activation within the tumor micro-environment are in progress to maximize activity at the tumor site with tunable peripheral stimulation. Citation Format: Aanchal Sharma, Minh D To, Hardeep Kataria, Qian Liu, Rosemina Merchant, Fahar Merchant. Synergistically Engaging a b-Selective IL-2 Agonist with PD1/PDL-1 Blockade in a Bifunctional Superkine, MDNA223 [abstract]. In: Proceedings of the AACR Special Conference in Cancer Research: Tumor Immunology and Immunotherapy; 2023 Oct 1-4; Toronto, Ontario, Canada. Philadelphia (PA): AACR; Cancer Immunol Res 2023;11(12 Suppl):Abstract nr A005.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».