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Target intelligence / Profile preview
T helper type 1 cells (Th1 cells)
- Target
- Th1 cells
- Molecular classification
- CD4+ T lymphocytes, Alpha:beta lineage T cells, Cell subset
01
Overview
T helper 1 (Th1) cells are a specialized subset of CD4+ T lymphocytes crucial for immune responses against intracellular pathogens. They differentiate from naïve CD4+ T cells, primarily driven by IL-12 and IL-27, with T-bet as their master regulator. Th1 cells secrete key cytokines like IFN-γ (their signature cytokine), IL-2, and TNF-α, which activate macrophages to eliminate intracellular pathogens, activate CD8+ cytotoxic T lymphocytes against tumors, and promote IgG2a antibody class switching. While vital for immunity, excessive Th1 activity contributes to autoimmune diseases and chronic inflammatory disorders such as Hashimoto's thyroiditis, multiple sclerosis, rheumatoid arthritis, and Crohn's disease, and can cause delayed-type hypersensitivity reactions. Modulating Th1 activity offers therapeutic potential, but they are considered a cellular component rather than a direct molecular target like a receptor or enzyme.
- Other names
- Th1 cells
02
Biological functions
Host defense against intracellular pathogens (viruses, intracellular bacteria, protozoa)Secretion of IFN-γ, IL-2, TNF-α, TNF-βActivation of macrophages and enhancement of their ability to kill intracellular pathogensInduction of inducible nitric oxide synthase (iNOS) for pathogen killingAmplification of Th1 responses through CD40L-CD40 interaction and IL-12 productionActivation of CD8+ cytotoxic T lymphocytes (CTLs) to target and destroy tumorsIncreased CTL survival and memoryActivation of class switching in B cells to produce IgG2a antibodies
03
Disease associations
Essential for defense against intracellular pathogensContribution to various inflammatory and autoimmune conditions due to overactivationHashimoto's thyroiditisMultiple sclerosisInsulin-dependent diabetes mellitus (Type 1 diabetes)Rheumatoid arthritisCrohn's diseaseSarcoidosisAcute allograft rejectionAtherosclerosisType IV or delayed-type hypersensitivity reactions
04
Safety considerations
Overactivation leading to inflammatory and autoimmune conditions
05
Biomarkers
CCR1CCR5CXCR3CD3CD4IFN-γ receptor (R1 and R2)IL-12 receptor betaIL-18 receptor alphaIL-27 receptor alphaSTAT1STAT4T-betIFN-γIL-2TNF-αTNF-β
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