Tissue f r om rat used for detection of antinuclear antibodies
**Core Concept**
The question is testing the knowledge of the HEp-2 cell line, which is a type of tissue culture used to detect antinuclear antibodies (ANA) in patients with autoimmune diseases such as systemic lupus erythematosus (SLE). The HEp-2 cell line is derived from a human laryngeal carcinoma cell line, but the question specifically mentions rat tissue, which is not the correct answer.
**Why the Correct Answer is Right**
The correct answer is actually none of the above, as the HEp-2 cell line is derived from human tissue, not rat tissue. However, the question is likely testing the knowledge of the HEp-2 cell line as a standard substrate for ANA detection. The HEp-2 cell line is used because it contains a variety of nuclear antigens that are recognized by ANA, including histones, DNA topoisomerase I, and others. The presence of these antigens makes it an ideal substrate for detecting ANA.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a valid option, as there is no information provided to support this answer.
* **Option B:** This option is incorrect because it does not specify the type of tissue or cell line used for ANA detection.
* **Option C:** This option is incorrect because it does not correctly identify the tissue or cell line used for ANA detection.
**Clinical Pearl / High-Yield Fact**
The HEp-2 cell line is a widely used substrate for detecting ANA, and the presence of these antibodies is a hallmark of autoimmune diseases such as SLE. The HEp-2 cell line is preferred over other substrates because it contains a variety of nuclear antigens that are recognized by ANA.
**Correct Answer: None**