Dysfunction of CD8+ T cells can lead to the development of chronic viral infection. Identifying mechanisms responsible for such T cell dysfunction is therefore of great importance to understand how to prevent persistent viral infection. Here we show using lymphocytic choriomeningitis virus (LCMV) infection that carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is fundamental for recruiting lymphocyte-specific protein kinase (Lck) into the T cell receptor complex to form an efficient immunological synapse. CEACAM1 is essential for activation of CD8+ T cells, and the absence of CEACAM1 on virus-specific CD8+ T cells limits the antiviral CD8+ T cell response. Treatment with anti-CEACAM1 antibody stabilizes Lck in the immunological synapse, prevents CD8+ T cell exhaustion, and improves control of virus infection in vivo. Treatment of human virus-specific CD8+ T cells with anti-CEACAM1 antibody similarly enhances their proliferation. We conclude that CEACAM1 is an important regulator of virus-specific CD8+ T cell functions in mice and humans and represents a promising therapeutic target for modulating CD8+ T cells.
Background: Most common localized reactive lesions of oral cavity are focal fibrous hyperplasia, pyogenic granuloma (PG), irritational fibroma, peripheral giant cell granuloma (PGCG), peripheral ossifying fibroma (POF), fibro-epithelial hyperplasia/polyp, inflammatory fibrous hyperplasia and inflammatory gingival hyperplasia. Clinically, these reactive lesions often present diagnostic challenges because they mimic different groups of pathologic processes. The aim of this paper is to document the occurrence, distribution of clinical features of reactive lesions of oral cavity in 15 years of clinical practice in Raichur, Karnataka.
Materials and Methods:This study is a retrospective archival review of 530 cases of focal reactive lesions of the oral cavity. The cases for inclusion in this study were PG, PGCG, POF, irritational fibroma, fibro-epithelial hyperplasia/polyp, inflammatory fibrous hyperplasia and inflammatory gingival hyperplasia. Clinical data of each patient such as age, gender, location, and treatment were retrieved from the records. Results: Inflammatory gingival hyperplasia was the most prevalent lesion and followed by PG. The age ranged from 7 to 63 years, with a mean age of 40.5 years. 261 cases were males and 269 cases were females. Male to female ratio being 1:1. With the exception of PG and inflammatory gingival hyperplasia, all reactive lesions were more common in males. Gingiva with 470 cases was the most frequent site of reactive lesions, followed by buccal mucosa and palate. Conclusion: Reported results on the age, gender, and location of the individual types of lesions are not consistent in different studies. Some of the differences may be attributed to the geographic or ethnic factors. Nevertheless, there is need for more epidemiological studies to establish a better and adequate program to educate general population. Inaddition an early diagnosis and elimination of such lesions may minimize possible dentoalveolar complications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.