Effect of galectin-3 deficiency on mast cells activation and skin lesion in psoriatic mice model
10.3969/j.issn.1000-484X.2024.04.003
- VernacularTitle:Galectin-3缺失对银屑病小鼠模型中肥大细胞活化及皮肤损伤的影响
- Author:
Meiqi CHENG
1
;
Zhu JIN
;
Ding ZHANG
;
Qiong WANG
;
Yue HU
;
Jin CHAO
;
Decheng WANG
;
Shan-Shan HAN
Author Information
1. 肿瘤微环境与免疫治疗湖北省重点实验室(三峡大学),三峡大学炎症与感染损伤研究所,宜昌 443002
- Keywords:
Psoriasis;
Galectin-3(Gal3);
Mast cell;
Activation
- From:
Chinese Journal of Immunology
2024;40(4):686-692
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the effects and potential mechanisms of galectin-3(Gal3)on mast cells activation and skin injury in a psoriatic murine model.Methods:Imiquimod was applied to the bare skin on back of SPF(Gal3+/+)mice and their matched(Gal3-/-)siblings respectively once daily for 5 d to establish a psoriatic mice model.The development and dynamics of skin le-sions were monitored and recorded,scored.with the psoriasis area and severity index(PASI).The expressions of il-1 and il-17 in the damaged skin were detected by real-time PCR to compare the severity of inflammation between Gal3+/+ mice and their Gal3-/-siblings.HE staining was used to observe the histopathological changes of skin.The difference in morphology and distribution of mast cells were examined by toluidine blue staining.Immunohistochemistry and image analysis techniques were improved to assay the expression and distribution of activated mast cells markers such as tryptase and 5-hydroxytryptamine(5-HT).Results:The typical psoriatic signs in-cluding erythema,scaling and infiltration were formed in mice after continuous administration of imiquimod in Gal3-/-mice,whereas Gal3+/+ mice just developed small scaling and mild infiltration.PASI score of Gal3-/-mice was significantly higher than that of Gal3+/+mice.In accordance,il-1 and il-17 were increased in the skin lesions of Gal3+/+ mice and Gal3-/-mice,but these inflammatory factors were more upregulated remarkably in the latter.Histopathology observation revealed that the epidermis of Gal3+/+ mice was slightly thickened,whereas thickened epidermis of Gal3-/-mice was more seriously and the rete ridges extended downward,with massive in-flammatory cells aggregation.Toluidine blue staining indicated that the mast cells were sparsely distributed and most of their structures were intact in Gal3+/+ mice,instead the mast cells of Gal3-/-mice were mostly in degranulation state with increased and distributed widely in skin.Immunohistochemistry staining revealed that tryptase and 5-HT,compared with those of Gal3+/+ mice,were increased obviously in the lesioned skin of Gal3-/-mice,most of them were concentrated in the epidermal in particular.Conclusion:The defi-ciency of Gal3 may result in over-activation and degranulation of mast cells at the skin in psoriatic mice model,which aggravates the occurrence of dermatitis inflammatory injury and disease progression in psoriasis,and Gal3 plays suppressive effects on mast cells acti-vation and degranulation at the skin lesions in this model.
