Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 4 complete abstracts (727 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
A subset of helper-inducer T-lymphocytes which synthesize and secrete interleukin-2; interferon-gamma; and interleukin-12. Due to their ability to kill antigen-presenting cells and their lymphokine-mediated effector activity, Th1 cells are associated with vigorous delayed-type hypersensitivity reactions.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Cells, Th1; Cell, Th1; Th1 Cell; T Helper 1 Cells; Type 1 Helper T Cells; TH-1 Cells; Cells, TH-1; Cell, TH-1.
Where it fits in the MeSH classification
- Broader topics
- T-Lymphocytes, Helper-Inducer
Related concepts
- Interleukin-2
- Interferon-Gamma
- Interleukin-12
Research landscape
PubMed indexes 20,667 records tagged with the MeSH heading “Th1 Cells” (counts retrieved 2026-10-31). 2,461 of them (11.9%) were published from 2020 onward, and the busiest period so far is 2000-2009 with 8,350 records.
Reviews account for 2,277 records (11.0%) and meta-analyses for 16. Randomized controlled trials number 212 (1.0%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 2,322 |
| 2000-2009 | 8,350 |
| 2010-2019 | 7,534 |
| 2020 onward | 2,461 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 2,277 | 11.0% |
| Meta-analyses | 16 | 0.1% |
| Randomized controlled trials | 212 | 1.0% |
Method: PubMed query "Th1 Cells"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-31.
Reading the evidence in anatomy and physiology
Anatomy describes how body structures are built and physiology describes how they normally work, so most findings here are descriptive or mechanistic rather than evidence about treatment. Much of what is known comes from dissection, imaging, tissue studies and experiments in animals, and measurements in healthy volunteers can differ from those in people with disease or at different ages. Normal ranges vary between individuals and populations. Check whether a result was measured in people or in another species, the age and health of the participants, and the method used.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| Distinct spatial and temporal roles for Th1, Th2, and Th17 cells in asthma | 2022 | Review article Design not recorded in structured metadata | 105 | cc by PMID 36032162 · DOI · PMC9411752 |
| Dendritic cell Piezo1 directs the differentiation of TH1 and Treg cells in cancer | 2022 | Research article Design not recorded in structured metadata | 98 | cc by PMID 35993548 · DOI · PMC9451538 |
| Microbiota-derived IPA alleviates intestinal mucosal inflammation through upregulating Th1/Th17 cell apoptosis in inflammatory bowel disease | 2025 | Research article Design not recorded in structured metadata | 90 | cc by PMID 39956891 · DOI · PMC11834480 |
| IFN-γ-driven skewing towards Th1 over Th17 differentiation underlies CRS and neutropenia in CAR-T therapy | 2026 | Research article Design not recorded in structured metadata | 4 | cc by PMID 41165751 · DOI · PMC12721892 |
Distinct spatial and temporal roles for Th1, Th2, and Th17 cells in asthma [1]
Abstract reading summary — source excerpts
- Opening excerpt
- Immune response in the asthmatic respiratory tract is mainly driven by CD4+ T helper (Th) cells, represented by Th1, Th2, and Th17 cells, especially Th2 cells.
- Closing excerpt
- We also discuss the dynamic topography of Th subsets and pathogenetic memory Th cells in asthma.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (138 words)
Immune response in the asthmatic respiratory tract is mainly driven by CD4+ T helper (Th) cells, represented by Th1, Th2, and Th17 cells, especially Th2 cells. Asthma is a heterogeneous and progressive disease, reflected by distinct phenotypes orchestrated by τh2 or non-Th2 (Th1 and Th17) immune responses at different stages of the disease course. Heterogeneous cytokine expression within the same Th effector state in response to changing conditions in vivo and interlineage relationship among CD4+ T cells shape the complex immune networks of the inflammatory airway, making it difficult to find one panacea for all asthmatics. Here, we review the role of three T helper subsets in the pathogenesis of asthma from different stages, highlighting timing is everything in the immune system. We also discuss the dynamic topography of Th subsets and pathogenetic memory Th cells in asthma.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 36032162 · DOI · PMC9411752
Dendritic cell Piezo1 directs the differentiation of TH1 and Treg cells in cancer [2]
Abstract reading summary — source excerpts
- Opening excerpt
- Dendritic cells (DCs) play an important role in anti-tumor immunity by inducing T cell differentiation.
- Closing excerpt
- Our studies provide critical insight for understanding the role of the DC-based mechanical regulation of immunopathology in directing T cell lineage commitment in tumor microenvironments.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (154 words)
Dendritic cells (DCs) play an important role in anti-tumor immunity by inducing T cell differentiation. Herein, we found that the DC mechanical sensor Piezo1 stimulated by mechanical stiffness or inflammatory signals directs the reciprocal differentiation of TH1 and regulatory T (Treg) cells in cancer. Genetic deletion of Piezo1 in DCs inhibited the generation of TH1 cells while driving the development of Treg cells in promoting cancer growth in mice. Mechanistically, Piezo1-deficient DCs regulated the secretion of the polarizing cytokines TGFβ1 and IL-12, leading to increased TGFβR2-p-Smad3 activity and decreased IL-12Rβ2-p-STAT4 activity while inducing the reciprocal differentiation of Treg and TH1 cells. In addition, Piezo1 integrated the SIRT1-hypoxia-inducible factor-1 alpha (HIF1α)-dependent metabolic pathway and calcium-calcineurin-NFAT signaling pathway to orchestrate reciprocal TH1 and Treg lineage commitment through DC-derived IL-12 and TGFβ1. Our studies provide critical insight for understanding the role of the DC-based mechanical regulation of immunopathology in directing T cell lineage commitment in tumor microenvironments.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 35993548 · DOI · PMC9451538
Microbiota-derived IPA alleviates intestinal mucosal inflammation through upregulating Th1/Th17 cell apoptosis in inflammatory bowel disease [3]
Abstract reading summary — source excerpts
- Opening excerpt
- The gut microbiota-derived metabolite indole-3-propionic acid (IPA) plays an important role in maintaining intestinal mucosal homeostasis, while the molecular mechanisms underlying IPA regulation on mucosal CD4+ T cell functions in inflammatory bowel disease (IBD) remain elusive.
- Closing excerpt
- Therefore, these findings identify a previously unrecognized pathway by which IPA modulates intestinal inflammation and provide a promising avenue for the treatment of IBD.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (254 words)
The gut microbiota-derived metabolite indole-3-propionic acid (IPA) plays an important role in maintaining intestinal mucosal homeostasis, while the molecular mechanisms underlying IPA regulation on mucosal CD4+ T cell functions in inflammatory bowel disease (IBD) remain elusive. Here we investigated the roles of IPA in modulating mucosal CD4+ T cells and its therapeutic potential in treatment of human IBD. Leveraging metabolomics and microbial community analyses, we observed that the levels of IPA-producing microbiota (e.g. Peptostreptococcus, Clostridium, and Fournierella) and IPA were decreased, while the IPA-consuming microbiota (e.g. Parabacteroides, Erysipelatoclostridium, and Lachnoclostridium) were increased in the feces of IBD patients than those in healthy donors. Dextran sulfate sodium (DSS)-induced acute colitis and CD45RBhighCD4+ T cell transfer-induced chronic colitis models were then established in mice and treated orally with IPA to study its role in intestinal mucosal inflammation in vivo. We found that oral administration of IPA attenuated mucosal inflammation in both acute and chronic colitis models in mice, as characterized by increased body weight, and reduced levels of pro-inflammatory cytokines (e.g. TNF-α, IFN-γ, and IL-17A) and histological scores in the colon. We further utilized RNA sequencing, molecular docking simulations, and surface plasmon resonance analyses and identified that IPA exerts its biological effects by interacting with heat shock protein 70 (HSP70), leading to inducing Th1/Th17 cell apoptosis. Consistently, ectopic expression of HSP70 in CD4+ T cells conferred resistance to IPA-induced Th1/Th17 cell apoptosis. Therefore, these findings identify a previously unrecognized pathway by which IPA modulates intestinal inflammation and provide a promising avenue for the treatment of IBD.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 39956891 · DOI · PMC11834480
IFN-γ-driven skewing towards Th1 over Th17 differentiation underlies CRS and neutropenia in CAR-T therapy [4]
Abstract reading summary — source excerpts
- Opening excerpt
- Chimeric antigen receptor T cell (CAR-T) therapy has led to significant improvements in patient survival.
- Closing excerpt
- We have uncovered a biological basis for ICAHT and provide support for the use of IFN-γ blockade to reduce both CRS and neutropenia.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (181 words)
Chimeric antigen receptor T cell (CAR-T) therapy has led to significant improvements in patient survival. However, a subset of patients experience high-grade toxicities, including cytokine release syndrome (CRS) and immune cell-associated hematological toxicity (ICAHT). We utilized IL-2Ra knockout mice to model toxicities with elevated levels of IL-6, IFN-γ, and TNF-α and increased M1-like macrophages. Onset of CRS was accompanied by a reduction in peripheral blood neutrophils due to disruption of bone marrow neutrophil homeostasis characterized by an increase in apoptotic neutrophils and a decrease in proliferative and mature neutrophils. Both nontumor-bearing and Em-ALL tumor-bearing mice recapitulated the cooccurrence of CRS and neutropenia. IFN-γ-blockade alleviated CRS and neutropenia without affecting CAR-T efficacy. Mechanistically, a Th1-Th17 imbalance was observed to drive cooccurrence of CRS and neutropenia in an IFN-γ-dependent manner leading to decreased IL-17A and G-CSF, neutrophil production, and neutrophil survival. In patients, we observed an increase in the IFN-γ-to-IL-17A ratio in the peripheral blood during high-grade CRS and neutropenia. We have uncovered a biological basis for ICAHT and provide support for the use of IFN-γ blockade to reduce both CRS and neutropenia.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41165751 · DOI · PMC12721892
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article Central memory and effector memory T cell subsets: function, generation, and maintenance [5]
- Research article The biology of NKT cells [6]
- Research article CD4⁺T cells: differentiation and functions [7]
- Research article T cells in multiple sclerosis and experimental autoimmune encephalomyelitis [8]
- Research article Th1/Th2 balance: the hypothesis, its limitations, and implications for health and disease [9]
- Research article Inflammation and pregnancy [10]
References
- Luo W, Hu J, Xu W, Dong J. Distinct spatial and temporal roles for Th1, Th2, and Th17 cells in asthma. . 2022. PMID 36032162 · DOI · PMC9411752
- Wang Y, Yang H, Jia A, Wang Y, Yang Q, Dong Y, et al.. Dendritic cell Piezo1 directs the differentiation of TH1 and Treg cells in cancer. . 2022. PMID 35993548 · DOI · PMC9451538
- Gao H, Sun M, Li A, Gu Q, Kang D, Feng Z, et al.. Microbiota-derived IPA alleviates intestinal mucosal inflammation through upregulating Th1/Th17 cell apoptosis in inflammatory bowel disease. . 2025. PMID 39956891 · DOI · PMC11834480
- Goala P, Zhang Y, Beatty N, Pavy A, McSain S, Sailer C, et al.. IFN-γ-driven skewing towards Th1 over Th17 differentiation underlies CRS and neutropenia in CAR-T therapy. . 2026. PMID 41165751 · DOI · PMC12721892
- Sallusto F, Geginat J, Lanzavecchia A. Central memory and effector memory T cell subsets: function, generation, and maintenance. Annu Rev Immunol. 2004. PMID 15032595 · DOI
- Bendelac A, Savage PB, Teyton L. The biology of NKT cells. Annu Rev Immunol. 2007. PMID 17150027 · DOI
- Luckheeram RV, Zhou R, Verma AD, Xia B. CD4⁺T cells: differentiation and functions. Clin Dev Immunol. 2012. PMID 22474485 · DOI · PMC3312336
- Fletcher JM, Lalor SJ, Sweeney CM, Tubridy N, Mills KH. T cells in multiple sclerosis and experimental autoimmune encephalomyelitis. Clin Exp Immunol. 2010. PMID 20682002 · DOI
- Kidd P. Th1/Th2 balance: the hypothesis, its limitations, and implications for health and disease. Altern Med Rev. 2003. PMID 12946237
- Challis JR, Lockwood CJ, Myatt L, Norman JE, Strauss JF, Petraglia F. Inflammation and pregnancy. Reprod Sci. 2009. PMID 19208789 · DOI
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-31.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.