Epstein Barr virus causes autoimmunity by –
**Core Concept**
Epstein Barr virus (EBV) is a member of the herpesvirus family, which is known to cause infectious mononucleosis (glandular fever). EBV infection has been associated with various autoimmune diseases, including rheumatoid arthritis, lupus, and multiple sclerosis. The exact mechanism of EBV-induced autoimmunity is complex and multifaceted.
**Why the Correct Answer is Right**
EBV causes autoimmunity through molecular mimicry, where the virus's proteins are structurally similar to host proteins, leading to an immune response against self-antigens. This can result in the production of autoantibodies and the activation of autoreactive T cells. Additionally, EBV can also induce the production of cytokines, such as interferon-gamma, which can exacerbate autoimmune responses. EBV's ability to infect B cells and manipulate the immune system further contributes to its role in autoimmunity.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because EBV's role in autoimmunity is not primarily due to its ability to cause chronic inflammation. While chronic inflammation can contribute to autoimmune disease, it is not the primary mechanism by which EBV causes autoimmunity.
**Option B:** This option is incorrect because EBV's ability to induce apoptosis (programmed cell death) is not directly related to its role in autoimmunity. While apoptosis can contribute to the development of autoimmune disease, it is not the primary mechanism by which EBV causes autoimmunity.
**Option C:** This option is incorrect because EBV's ability to infect epithelial cells is not directly related to its role in autoimmunity. While EBV can infect epithelial cells, its primary role in autoimmunity is related to its ability to infect B cells and manipulate the immune system.
**Option D:** This option is incorrect because EBV's ability to induce cancer is not directly related to its role in autoimmunity. While EBV is associated with certain types of cancer, such as Burkitt lymphoma, its primary role in autoimmunity is related to its ability to cause molecular mimicry and manipulate the immune system.
**Clinical Pearl / High-Yield Fact**
EBV is a common cause of infectious mononucleosis, but its role in autoimmunity is complex and multifaceted. It is essential to consider EBV as a potential contributing factor in patients with autoimmune diseases, particularly those with a history of infectious mononucleosis.
**Correct Answer: C. EBV's ability to infect B cells and manipulate the immune system is a key factor in its role in autoimmunity.**