CD8+ T cell

Immune-Oncology Assays

2D/ 3D Tumour Killing Assay
Antigen-specific CTL-CEFT (phenotype, proliferation, degranulation)
MART-1 specific CTL- cytotoxicity
T cell exhaustion

Autoimmunity Assays

Activation
Proliferation and function

Enzyme-Linked Immuno Spot (ELISpot) is a technique which quantifies immune cells of low abundance which release biomarkers such as cytokines in response to antigenic stimulation. ELISpot is a highly sensitive method to test immune modulators, novel vaccine candidates or de-risk immunogenicity testing in an antigen-specific CD4 and/or CD8 T cell assay.

Condition	Aim
No Stimulation	Negative control
PMA	Positive control
CERI (CMV, EBV, RSV, Influenza)	MHC-I restricted peptide pool to evaluate modulation of CD8+ T-cell memory response
CPI (CMV, Parainfluenza, Influenza)	Positive protein antigens to evaluate modulation of CD4+ T-cell memory response
CEF (CMV, EBV, Influenza)	MHC-I restricted peptide pool to evaluate modulation of CD8+ T-cell memory response
Cyclosporin A (CsA)	Inhibition of immune response

**Figure 1:** The ELISpot visual image results showing four donors under four conditions: Unstimulated (negative control), stimulated with PMA (positive control), stimulated with CERI, and stimulated with CPI antigens. Each purple spot represents one IFN-γ producing cell.

Spot Forming Units (SPU) for IFN-γ per 100,000 PBMC from CERI, CPI and CEF antigens for three donors

**Figure 2:** T cell responses from three donors using stimuli, CERI (I), CPI (II) and CEF (III). Expressed as spot forming units per 100,000 donor PBMC. Depletion of CD4 or CD8 T cells demonstrates specificity of response to peptide pools. Each value represents the mean of triplicate wells ±SEM.

Evaluation of therapeutic modulation of antigen-specific memory T cell responses to recall antigens

I. T cell response to Tetanus Toxoid, Influenza and PPD antigens

II. Dose response to Influenza antigen

Antigen specific T cells response to a recall antigens. (I) Healthy donors PBMC were stimulated with PHA-M or triple antigen cocktail (Tetanus Toxoid, Influenza and PPD). Cyclosporin was used as a reference treatment. (II) Dose response to Influenza antigen. CD4 and CD8 T cells proliferation was measured by flow cytometry using CTV dilutions.

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