Volume 26, Issue 6 pp. 1246-1254
ORIGINAL ARTICLE

Evaluation of PD-L1, PD-L2, PD-1 and cytotoxic immune response in oral lichen planus

Nádia Lago Costa

Corresponding Author

Nádia Lago Costa

Department of Stomatology (Oral Medicine and Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

Correspondence

Nádia Lago Costa, Department of Stomatology (Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Praça Universitária, S/N, Setor Universitário, Goiânia, GO, CEP: 74605-220, Brazil.

Emails: [email protected]; [email protected]

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Julie Ane Maria Gonçalves

Julie Ane Maria Gonçalves

Department of Stomatology (Oral Medicine and Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

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Sara Lia Gonçalves de Lima

Sara Lia Gonçalves de Lima

Department of Stomatology (Oral Medicine and Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

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José Alcides Almeida de Arruda

José Alcides Almeida de Arruda

Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

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Ana Carolina Campos Miranda

Ana Carolina Campos Miranda

Department of Stomatology (Oral Medicine and Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

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Ricardo Alves Mesquita

Ricardo Alves Mesquita

Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

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Éricka Janine Dantas da Silveira

Éricka Janine Dantas da Silveira

Postgraduate Program in Odontology Sciences, Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, Brazil

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Aline Carvalho Batista

Aline Carvalho Batista

Department of Stomatology (Oral Medicine and Oral Pathology), School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

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First published: 07 April 2020
Citations: 12

Abstract

Objective

To investigate the expression of programmed death-ligands 1 and 2 (PD-L1, PD-L2), programmed death-1 (PD-1), CD8 and granzyme B (GrB), as well as its correlation with the severity of oral lichen planus (OLP).

Materials and Methods

In a collaborative study, 33 cases of OLP were evaluated according to the latest criteria proposed by the American Academy of Oral and Maxillofacial Pathology (AAOMP/2016) and were submitted to immunohistochemistry. Positivity was measured semiquantitatively (PD-L1, PD-L2) and quantitatively (PD-1, CD8, GrB). The severity of OLP was assessed according to clinical subtype, symptomatology and response to corticosteroid therapy.

Results

Most OLPs were considered to be negative for PD-L1 (66.6%), but high expression of PD-L2 (96.9%) by keratinocytes and immunoinflammatory cells was observed. PD-1+ cell density/mm2 was reduced compared to CD8+ cells. A low cytotoxic immune response (CD8:GrB ratio) was also demonstrated. Interestingly, there were fewer GrB+ cells in the intraepithelial region in reticular OLP compared to erosive/bullous OLP.

Conclusions

PD-L1/PD-1 pathways appear to be compromised in OLP due to low PD-L1 expression in most samples. In contrast, PD-L2 overexpression associated with a possible regulation of the cytotoxic immune response suggests an immune tolerance that may contribute to the chronic profile of OLP.

CONFLICT OF INTERESTS

None to declare.

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