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The receptor BLT1 is essential on neutrophils in a mouse model of mucous membrane pemphigoid
Tabea Bremer, Sripriya Murthy, Sabrina Patzelt, Paul Schilf, Mareike Neumann, Sina Gonther, Jasper Pruessmann, Wiebke Pruessmann, Enno Schmidt, Thomas Rülicke, Christian D. Sadik
Tabea Bremer, Sripriya Murthy, Sabrina Patzelt, Paul Schilf, Mareike Neumann, Sina Gonther, Jasper Pruessmann, Wiebke Pruessmann, Enno Schmidt, Thomas Rülicke, Christian D. Sadik
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Research Article Dermatology

The receptor BLT1 is essential on neutrophils in a mouse model of mucous membrane pemphigoid

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Abstract

Mucous membrane pemphigoid (MMP) is a mucocutaneous autoimmune blistering disease affecting diverse mucous membranes and the skin with inflammatory blisters and erosions. The pathogenesis of MMP is only poorly understood, but inflammation in MMP is triggered by specific binding of autoantibodies directed to different proteins of the dermal-epidermal/-epithelial junction, subsequently leading to the influx of inflammatory cells, particularly neutrophils, into the dermis. Using the anti-laminin 332 antibody transfer model of MMP, we addressed the molecular mechanisms of neutrophil infiltration and its significance for the eruption of mucocutaneous lesions. Mice deficient in 5-lipoxygenase (Alox5–/–) or in the leukotriene B4 (LTB4) receptor BLT1 (Ltb4r1–/–) were resistant to skin inflammation and exhibited substantially fewer mucosal lesions, with deficiency in either gene compromising the recruitment of neutrophils to the lesion. Furthermore, neutrophil-specific genetic deficiency in Ltb4r1 similarly protected from MMP. Hence, BLT1 was required on neutrophils, and neutrophil recruitment was indispensable for the eruption of lesions in MMP. In line with these findings, the BLT1 inhibitor CP-105,606 ameliorated MMP dose-dependently. Collectively, our results highlight neutrophils and LTB4/BLT1 as key drivers of inflammation in MMP and as promising therapeutic targets.

Authors

Tabea Bremer, Sripriya Murthy, Sabrina Patzelt, Paul Schilf, Mareike Neumann, Sina Gonther, Jasper Pruessmann, Wiebke Pruessmann, Enno Schmidt, Thomas Rülicke, Christian D. Sadik

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Figure 3

The BLT1 antagonist CP-105,696 ameliorates mucocutaneous inflammation in MMP dose-dependently.

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The BLT1 antagonist CP-105,696 ameliorates mucocutaneous inflammation in...
Wild-type mice were subjected to the MMP model and received 1, 5, or 10 mg/kg body weight CP-105,696 or its vehicle daily p.o. starting on day 0. (A) Progression of skin inflammation assessed by the percentage of the total body surface affected by skin lesions (n = 7–8 male and 8 female mice/group). (B) Representative pictures of all groups on day 13. Arrows indicate inflammatory lesions. (C) Comparison of the severity of mucosal lesions in the oropharynx evaluated by the endoscopy score (n = 7–8 male and 8 female mice/group). (D) Representative endoscopy pictures of mucosal surfaces on day 16. Arrows indicate inflammatory lesions. (E) Contingency table of the number of vehicle- and 10 mg/kg CP-105,696–treated mice with and without conjunctival lesions (7 male and 7 female mice/group). The frequency of mice with inflammatory lesions statistically significantly differed between the 2 groups with P < 0.01 determined by χ2 test. (F) Representative H&E staining of the conjunctiva of vehicle- and CP-105,696–treated mice on day 16. Scale bars equal 50 μm. All results are presented as mean ± SEM. In C, each dot represents a mouse. The results were examined for statistical significance in A by 2-way ANOVA and Holm-Šídák post hoc test and in C by Kruskal-Wallis test with Dunn’s correction for multiple comparisons. In A, at the days indicated, *P < 0.05; **P < 0.01; ****P < 0.0001 for the comparison of the indicated groups with the vehicle group; #P < 0.05; ##P < 0.01; ###P < 0.001 for the comparison of the indicated group with the 10 mg/kg CP-105,696 treatment group. In C, *P < 0.05; **P < 0.01 for the comparisons indicated.

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