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Updated: May 26, 2026

Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
Published on: September 26, 2013
Th17 cells mediate clade-specific, serotype-independent mucosal immunity
Kong Chen1, Jeremy P McAleer, Yuan Lin
1Department of Genetics, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA.
Memory Th17 cells provide broad mucosal immunity against Klebsiella pneumoniae infections, independent of antibodies. This highlights their evolutionary advantage in host defense beyond B cell responses.
Area of Science:
- Immunology
- Microbiology
- Evolutionary Biology
Background:
- The interleukin-17 (IL-17) cytokine family predates T cell evolution, suggesting innate sources of IL-17 existed before the Th17 cell lineage.
- The Th17 cell lineage likely evolved to provide an evolutionary advantage to the host over these innate IL-17 sources.
Purpose of the Study:
- To investigate the protective mechanisms of Th17 cells versus B cells in mucosal immunity against Klebsiella pneumoniae.
- To determine if Th17 cell-mediated protection is serotype-specific or heterologous.
Main Methods:
- Mucosal immunization model using encapsulated Klebsiella pneumoniae.
- Analysis of B cell recognition of polysaccharide capsular antigens.
- Assessment of memory Th17 cell proliferation against conserved outer membrane proteins.
- Evaluation of antibody-independent protection against multiple K. pneumoniae serotypes.
Main Results:
- B cells conferred protection only against the vaccine strain, recognizing polysaccharide antigens.
- Memory Th17 cells proliferated in response to conserved outer membrane proteins.
- Th17 cells provided heterologous, clade-specific protection against multiple K. pneumoniae serotypes, including a multidrug-resistant strain.
- This protection was independent of antibodies.
Conclusions:
- The Th17 cell lineage confers a host advantage by providing heterologous mucosal immunity.
- This immunity is independent of serotype-specific antibodies, offering broader protection than B cell responses.
- Th17 cells represent a crucial component of adaptive immunity against bacterial pathogens at mucosal surfaces.
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