RGS16 attenuates pulmonary Th2/Th17 inflammatory responses

Area of Science:

• Immunology
• Cell Biology
• Pulmonary Medicine

Background:

• Regulators of G protein signaling (RGS) proteins modulate G protein-coupled receptor (GPCR) signaling.
• RGS16 is specifically expressed in activated T lymphocytes and plays a role in immune responses.

Purpose of the Study:

• To investigate the role of RGS16 in regulating T cell trafficking and pulmonary inflammation during Schistosoma mansoni infection.
• To determine how RGS16 deficiency impacts lung pathology and immune cell accumulation in response to parasitic challenge.

Main Methods:

• Utilized Rgs16 knockout (Rgs16(-/-)) and wild-type (WT) mice models.
• Administered Schistosoma mansoni challenge to induce parasitic infection and inflammation.
• Analyzed T cell populations (CCR4+, CCR10+), chemokine receptor expression, cytokine production (IL-13, IL-17B), and lung histology.

Main Results:

• Rgs16(-/-) mice exhibited enhanced pulmonary inflammation and granulomatous lung fibrosis compared to WT mice.
• Distinct Th2 and Th17 T cell subsets accumulated more rapidly in Rgs16(-/-) lungs, producing elevated levels of IL-13 and IL-17B.
• CCR4+ Rgs16(-/-) Th2 cells showed excessive migration to CCL17 and aberrant localization within challenged lungs, with T cells partially excluded from granulomas.

Conclusions:

• RGS16 is crucial for constraining pulmonary inflammation by regulating chemokine-induced T cell trafficking to parasite-induced granulomas.
• RGS16 deficiency leads to uncontrolled T cell accumulation and cytokine-mediated lung inflammation and fibrosis.
• Targeting RGS16 may offer a therapeutic strategy for mitigating inflammatory lung diseases.