The G-Protein–Coupled Receptor ALX/Fpr2 Regulates Adaptive Immune Responses in Mouse Submandibular Glands

Ching Shuen Wang, Olga J. Baker

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Lipoxin receptor (ALX)/N-formyl peptide receptor (FPR)-2 is a G-protein–coupled receptor that has multiple binding partners, including the endogenous lipid mediators resolvin D1, lipoxin A 4 , and the Ca 2+ -dependent phospholipid-binding protein annexin A1. Previous studies have demonstrated that resolvin D1 activates ALX/Fpr2 to resolve salivary gland inflammation in the NOD/ShiLtJ mouse model of Sjögren syndrome. Moreover, mice lacking the ALX/Fpr2 display an exacerbated salivary gland inflammation in response to lipopolysaccharide. Additionally, activation of ALX/Fpr2 has been shown to be important for regulating antibody production in B cells. These previous studies indicate that ALX/Fpr2 promotes resolution of salivary gland inflammation while modulating adaptive immunity, suggesting the need for investigation of the role of ALX/Fpr2 in regulating antibody production and secretory function in mouse salivary glands. Our results indicate that aging female knockout mice lacking ALX/Fpr2 display a significant reduction in saliva flow rates and weight loss, an increased expression of autoimmune-associated genes, an up-regulation of autoantibody production, and increased CD20-positive B-cell population. Although not all effects were noted among the male knockout mice, the results nonetheless indicate that ALX/Fpr2 is clearly involved in the adaptive immunity and secretory function in salivary glands, with further investigation warranted to determine the cause(s) of these between-sex differences.

Original languageEnglish
Pages (from-to)1555-1562
Number of pages8
JournalAmerican Journal of Pathology
Issue number7
Publication statusPublished - Jul 2018

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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