Summary of Abs targeting CD80/86 interaction with CD28

AbPropertiesClinical applicationDesired effectsDownsidesReferences
AbataceptFusion protein of the extracellular domain of CTLA-4 is linked to modified Fc portion

FDA-approved for:

RA

Psoriatic arthritis

Blocks CD80/86 interaction with CD28

Efficacious and relatively safe

Predisposes to infections

Costly

[103, 104]
Belatacept

Similar to abatacept in structure

4-fold higher affinity to CD86

2-fold higher affinity to CD80

FDA-approved for:

Immunosuppression after renal transplant

Higher graft survival compared to cyclosporine

Does not cause nephrotoxicity associated with cyclosporine

Higher early acute rejection[105, 106]
XPro952349 & MEDI5256

Similar to abatacept in structure

Higher avidity to CD80/86 than abatacept and belatacept

-Decreased humoral response to KLH immunization-[107, 108]
TAB08Agonistic anti-CD28 AbPhase 2 clinical trial for RAAt low doses, minimal activation of CD28 preferentially expands Tregs and increases serum IL-10Causes cytokine release syndrome if administered with a higher dose[109111]
FR104Pegylated Fab with antagonistic CD28 activity-

Decreased humoral response to KLH immunization in healthy human volunteers

Improved GVHD-free survival in primate models

Increased infectious complications[112, 113]

This table shows the various molecules generated to target co-stimulatory molecules (CD80/86) interaction with CD28. Inhibiting this interaction leads to T cell anergy and an inhibited immune response. -: no data. Fab: fragment Ag-binding; GVHD: graft-versus-host disease; TAB08: theralizumab