T Cell Receptor Sharing in Hypersensitivity Pneumonitis

Area of Science:

• Immunology
• Pulmonary Medicine
• Genomics

Background:

• Hypersensitivity pneumonitis (HP) involves an exaggerated T cell response to inhaled antigens.
• Identifying the specific antigen causing HP is crucial for effective treatment but often difficult.

Purpose of the Study:

• To explore the feasibility of profiling T cell receptor (TCR) repertoires for identifying causative antigens in hypersensitivity pneumonitis.
• To develop a strategy for pinpointing specific inhaled antigens triggering HP.

Main Methods:

• Utilized public RNA sequencing data from bronchoalveolar lavage samples.
• Reconstructed T cell receptor (TCR) repertoires from patients with HP, idiopathic pulmonary fibrosis, and healthy controls.
• Analyzed TCR sequences, excluding microbial-associated ones, to identify shared TCRs among patients with similar HLA alleles.

Main Results:

• Identified shared TCR sequences between HP patients with common human leukocyte antigen (HLA) alleles, suggesting shared causative antigens.
• Discovered clusters of identical and similar TCR clones within individual patients, likely linked to specific causative antigens.
• Demonstrated the potential for TCR repertoire profiling to identify HP-associated antigens.

Conclusions:

• Profiling TCR repertoires is a feasible approach to identify causative antigens in hypersensitivity pneumonitis.
• This method offers a promising strategy for diagnosing HP by pinpointing specific environmental triggers.
• Further research can leverage TCR repertoire analysis for targeted antigen identification in HP.