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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Differentiation, regulation and function of Th9 cells.

Lei Jia1, Changyou Wu

  • 1Key Laboratory of Tropical Disease Control Research of Ministry of Education, Zhongshan School of Medicine, Institute of Immunology, Sun Yat-Sen University, 74th, Zhongshan 2nd Road, Guangzhou, 510080, China.

Advances in Experimental Medicine and Biology
|September 28, 2014
PubMed
Summary

Newly identified T helper 9 (Th9) cells, which produce Interleukin-9 (IL-9), play a role in allergic inflammation, tumors, and parasitic infections. This chapter explores their development, stability, plasticity, and in vivo functions.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Naïve CD4(+) T cells differentiate into T helper (Th) cell lineages, producing cytokines crucial for adaptive immunity.
  • Recent discoveries have expanded our understanding of Th cell diversity, including the identification of Th9 cells.

Purpose of the Study:

  • To detail the regulatory mechanisms governing Th9 cell development.
  • To explore the stability, plasticity, and in vivo roles of Th9 cells.

Main Methods:

  • Review of cytokines and co-stimulatory factors influencing Th9 cell differentiation.
  • Analysis of transcriptional signaling pathways regulating Th9 cell fate.
  • Examination of Th9 cell functions in various disease models.

Main Results:

  • Th9 cells are characterized by their preferential secretion of Interleukin-9 (IL-9).
  • IL-9 has diverse functions, implicating Th9 cells in allergic inflammation, tumor immunity, and parasitic infections.
  • Factors regulating Th9 cell development, stability, and plasticity are complex and involve multiple signaling pathways.

Conclusions:

  • Th9 cells represent a distinct lineage with significant roles in both health and disease.
  • Understanding Th9 cell regulation is critical for developing targeted immunotherapies.
  • Further research into Th9 cell plasticity and in vivo functions is warranted.