If peripheral T cell lymphoma or T cell lymphomas of follicular helper origin are considered in the differential diagnosis, the following panel is recommended: pan T cell antigens, CD4, CD8, one or more follicular dendritic cell markers, and assessment for Epstein-Barr virus (EBV) infection, preferably EBV encoded RNA (EBER) as assessed by in situ hybridization When the differential diagnosis includes nodular lymphocyte predominant Hodgkin lymphoma, recommended additional studies include OCT2, CD21 and/or CD23, PD1, and assessment for EBV infection.
It has been shown that both CD21 and CD83 contribute to the resolution of inflammation occurred in MS. CD21 and CD83 have also been ascribed to Epstein Barr virus (EBV) infection (the prime suspect of MS causality) and the levels of vitamin D, respectively.
Our study of a viral cell line model provides evidence to suggest that CD21-dependent viral entry plays a crucial role in type 2 AECs, indicative of an IL-4 response EBV infection in IPF.
Epstein-Barr virus infection of rat lymphocytes expressing human CD21 results in restricted latent viral gene expression and not in immunoblastic transformation.
These results suggest the possible modulation of EBV infection via thiol-dependent redox control of CD21, and thiol-antioxidants may be good candidates for controlling EBV infection.
A molecule, which is biochemically and immunologically similar to B-cell CD21, has been identified on a subpopulation of immature thymocytes, suggesting a role for this molecule in the regulation of T-cell development and further suggesting that immature T cells might be susceptible to EBV infection.
These findings indicate that the HCL-O cell line is derived from the leukaemic hairy cells and possibly, in vitro EBV infection took place easily in the original hairy cells through their CD21, resulting in subsequent immortalization.