In vitro assessment of PD-L1+ microvesicles in the cyst fluid of non-syndromic odontogenic keratocysts
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Odontogenic keratocysts (OKCs) are jaw cystic lesions which are characterized by local invasion and high recurrence rate. The majority of OKCs are exposed to microorganisms and occur along with focal inflammatory infiltrates. Cyst fluids are biological fluids that contain a large content of cytokines and immune globulins. Inhibitory receptor such as programmed death receptor 1 (PD-1) and its ligand programmed death-ligand 1 (PD-L1), which can induce a coinhibitory signal in activated T cells, plays a vital role in the differentiation, exhaustion and apoptosis of T cells. Cell derived microvesicles, carrying a cargo of functional proteins, nucleic acids and lipids, are important communication tools in the development of diseases. However, the expression of PD-L1 in OKCs tissues and whether PD-L1 could be carried by microvesicles are unexplored. Presently, we have isolated cyst fluid microvesicles and identified cell derived PD-L1+ cyst fluid microvesicles. PD-L1 was located in the membrane of the cyst fluid microvesicles. The main cellular origins of PD-L1+ cyst fluid microvesicles were dendritic cells followed by lymphocytes. Elevated PD-L1+ cyst fluid microvesicles were detected in the OKCs compared with dentigerous cysts. Isolated cyst fluid microvesicles could bind to the membrane of activated CD8 T cells and inhibit proliferation of stimulated peripheral blood CD8 T cells. In conclusion, the present study suggests that elevated PD-L1+ cyst fluid microvesicles might be related with the cyst development of OKCs.
KeywordsOdontogenic keratocysts PD-L1 Microvesicles Cyst fluids
Cyst fluid microvesicles
The authors are grateful to all the pathology doctors from Hospital of Stomatology Wuhan University and technician Min Juan from the Centre Institute of Virology, Chinese Academy of Science for supporting our flow cytometric analysis.
This study was supported by Grants National Natural Science Foundation of China to Dr. Bing Liu (No. 81872203) and Dr. Wen-Qun Zhong (No. 81800994).
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interests.
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