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Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity

ABSTRACT: Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity

PROVIDER: PRJNA663153 | ENA |

REPOSITORIES: ENA

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Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity I

Project description:Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity I

| PRJNA662959 | ENA

Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity II

Project description:Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity II

| PRJNA663155 | ENA

Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity II

Project description:Innate pattern recognition receptors, including toll-like receptors (TLRs), can alter the tumor microenvironment and prime adaptive anti-tumor immunity. However, TLR agonists have not been well-tolerated due to toxicities associated with widespread immune activation following systemic administration. To design a therapeutic that is suitable for systemic delivery and capable of eliciting a tumor-targeted response, we developed a novel class of immune-stimulating antibody conjugates (ISACs) comprising a TLR7/8 agonist conjugated to tumor-targeting antibodies. Systemically administered anti-HER2 ISACs were well-tolerated in vivo and elicited robust activation of intratumoral myeloid cells, resulting in tumor clearance and subsequent immunological memory. In vitro potency and in vivo efficacy required tandem activity driven by intact Fc functionality and TLR agonism to enable phagocytosis and T cell-mediated anti-tumor immunity. ISAC-mediated immunological memory was not limited to HER2, as ISAC-treated mice were protected from rechallenge with a HER2-negative tumor. These results provide strong rationale for the clinical development of ISACs and show that synergy between FcgR and TLR7/8 signaling contributes to the mechanism of ISAC-mediated anti-tumor immunity.

2020-12-03 | GSE157869 | GEO

Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity I

Project description:Innate pattern recognition receptors, including toll-like receptors (TLRs), can alter the tumor microenvironment and prime adaptive anti-tumor immunity. However, TLR agonists have not been well-tolerated due to toxicities associated with widespreadimmune activation following systemic administration. To design a therapeutic that is suitable for systemic delivery and capable of eliciting a tumor-targeted response, we developed a novel class of immune-stimulating antibody conjugates (ISACs) comprising a TLR7/8 agonist conjugated to tumor-targeting antibodies. Systemically administered anti-HER2 ISACs were well-tolerated in vivo and elicited robust activation of intratumoral myeloid cells, resulting in tumor clearance and subsequent immunological memory. In vitro potency and in vivo efficacy required tandem activity driven by intact Fc functionality and TLR agonism to enable phagocytosis and T cell-mediated anti-tumor immunity. ISAC-mediated immunological memory was not limited to HER2, as ISAC-treated mice were protected from rechallenge with a HER2-negative tumor. These results provide strong rationale for the clinical development of ISACs and show that synergy between FcgR and TLR7/8 signaling contributes to the mechanism of ISAC-mediated anti-tumor immunity.

2020-12-03 | GSE157848 | GEO

Immune-stimulating antibody conjugates elicit robust myeloid activation and durable antitumor immunity.

Project description:Innate pattern recognition receptor agonists, including Toll-like receptors (TLRs), alter the tumor microenvironment and prime adaptive antitumor immunity. However, TLR agonists present toxicities associated with widespread immune activation after systemic administration. To design a TLR-based therapeutic suitable for systemic delivery and capable of safely eliciting tumor-targeted responses, we developed immune-stimulating antibody conjugates (ISACs) comprising a TLR7/8 dual agonist conjugated to tumor-targeting antibodies. Systemically administered human epidermal growth factor receptor 2 (HER2)-targeted ISACs were well tolerated and triggered a localized immune response in the tumor microenvironment that resulted in tumor clearance and immunological memory. Mechanistically, ISACs required tumor antigen recognition, Fcγ-receptor-dependent phagocytosis and TLR-mediated activation to drive tumor killing by myeloid cells and subsequent T-cell-mediated antitumor immunity. ISAC-mediated immunological memory was not limited to the HER2 ISAC target antigen since ISAC-treated mice were protected from rechallenge with the HER2- parental tumor. These results provide a strong rationale for the clinical development of ISACs.

| S-EPMC9012298 | biostudies-literature

Immune-stimulating antibody conjugates elicit robust myeloid activation and durable anti-tumor immunity

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-12-03 | GSE157870 | GEO

Covalent penicillin-protein conjugates elicit anti-drug antibodies that are clonally and functionally restricted

Project description:Many archetypal and emerging classes of small-molecule therapeutics form covalent 38 protein adducts. In vivo, both the resulting conjugates and their off-target side conjugates have the potential to elicit antibodies, with implications for allergy and drug sequestration. Although β-lactam antibiotics are a drug class long associated with these immunological phenomena, the molecular underpinnings of off-target drug protein conjugation and consequent drug-specific immune responses remain incomplete. Here, using the classical β-lactam penicillin G (PenG) we have now probed the B and T cell determinants of drug-specific IgG responses to such conjugates in mice. Deep clonotyping reveals a dominant murine clonal antibody class encompassing phylogenetically-related IGHV1, IGHV5 and IGHV10 subgroup gene segments. Protein NMR and x-ray structural analyses reveal that these drive structurally convergent binding modes in adduct-specific antibody clones. Their common primary recognition mechanisms of the penicillin side-chain moiety (phenylacetamide in PenG)—regardless of CDRH3 length—limits cross-reactivity against other β-lactam antibiotics. This immunogenetics-guided discovery of the limited binding solutions available to antibodies against side products of an archetypal covalent inhibitor now suggests future potential strategies for the ‘germline-guided reverse engineering’ of such drugs away from unwanted immune responses.

2024-08-08 | PXD052026 | Pride

Insulin and IGF-1 elicit robust transcriptional regulation to modulate autophagy in astrocytes

Project description:Insulin and IGF-1 elicit robust transcriptional regulation to modulate autophagy in astrocytes

| PRJNA878847 | ENA

Transcription profiling by array to assess epidemic methicillin-resistant Staphylococcus aureus 16 phenotypes induced by PBD conjugates

Project description:Objectives Pyrrolobenzodiazepine (PBD) dimers, tethered through inert propyldioxy or pentyldioxy linkers, possess potent bactericidal activity against a range of Gram-positive bacteria by virtue of their capacity to cross-link duplex DNA in sequence-selective fashion. Here we attempt to improve the antibacterial activity and cytotoxicity profile of PBD-containing conjugates by extension of dimer linkers and replacement of one PBD unit with phenyl-substituted or benzo-fused heterocycles that facilitate non-covalent interactions with duplex DNA. Methods DNase I footprinting was used to identify high-affinity DNA binding sites. A staphylococcal gene microarray was used to assess epidemic methicillin-resistant Staphylococcus aureus 16 phenotypes induced by PBD conjugates. Molecular dynamics simulations were employed to investigate the accommodation of compounds within the DNA helix. Results Increasing the length of the linker in PBD dimers led to a progressive reduction in antibacterial activity, but not in their cytotoxic capacity. Complex patterns of DNA binding were noted for extended PBD dimers. Modelling of DNA strand cross-linking by PBD dimers indicated distortion of the helix. A majority (26 of 43) of PBD-biaryl conjugates possessed potent antibacterial activity with little or no helical distortion and a more favourable cytotoxicity profile. Bactericidal activity of PBD-biaryl conjugates was determined by inability to excise covalently bound drug molecules from bacterial duplex DNA. Conclusions PBD-biaryl conjugates have a superior antibacterial profile compared with PBD dimers such as ELB-21. We have identified six PBD-biaryl conjugates as potential drug development candidates. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-118]

2012-04-17 | E-BUGS-118 | biostudies-arrayexpress

Piperlongumine (PL) conjugates induce targeted protein degradation

Project description:Piperlongumine (PL) conjugates induce targeted protein degradation

| PRJNA851461 | ENA