Company: CERO
Filing Date: 2025-02-05
Form Type: S-1/A
Source: 0001213900-25-010230
Chunk: 145

Company: CERO THERAPEUTICS HOLDINGS, INC.
Filing Date: 2025-02-05
Form: S-1/A
Chunk 145
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 participate primarily in the cell-mediated immune response while B cells are involved in the humoral immune response. T cells are an essential component of the adaptive immune system, targeting specific antigens and either destroying targeted cells directly or participating in their destruction by activating other immune cells. T cells use T cell specific receptors to recognize antigens presented via major histocompatibility complex (“MHC”) molecules on APCs. Through this mechanism, T cells have the ability to target tumor-transformed or virus infected cells, as well as help coordinate the activity of other immune cells. T cells are differentiated by the expression of protein markers on their surface. The two most prominent types of T cells are those that express CD8 molecules and are known as CD8 T cells, and those that express CD4 molecules and are known as CD4 T cells. CD8 T cells, also referred to as cytotoxic lymphocytes (“CTLs”), eliminate cells which they encounter that are recognized as being infected with viruses or other pathogens or are otherwise damaged or dysfunctional through a process referred to as cell lysis, which involves the release by these killer T cells of perforins and granzymes to compromise the integrity of the target cell’s membrane. Endogenous pathogens are broken down by mechanisms present in virtually all cells into smaller fragments and presented to CD8 T cells in combination with an MHC class I molecule. CD4 T cells, also referred to as T helper cells, have limited cytotoxic activity and typically do not kill infected or dysfunctional cells or eliminate pathogens directly. Instead, they participate in the immune response by providing signals which activate and orchestrate other types of immune cells to perform these tasks. Professional APCs, such as dendritic cells and macrophages, process exogenous pathogens and then present small fragments of the degraded pathogen to CD4 T cells in combination with an MHC class II molecule, through a phenomenon known as cross-presentation, while antigens of exogenous origin are coupled with an MHC Class I molecule to amplify CD8 T cell activity. Antigen cross presentation is of particular importance in the immune system’s response to cancer. 86 Genetically Engineered T Cells The ability to enhance the activity of T cells against human cancers through genetic engineering has been among the most significant advances in cancer therapy in the last decade. Advances in understanding T cells and their role in immunology, and an appreciation of their potential use to treat cancer, has increased interest in the clinical application of T cells in recent years, with the field of adoptive immunotherapy attaining increased prominence