question: How thyrocyte destruction is induced in autoimmune thyroiditis?
answer: Thyrocytes from Hashimoto's thyroiditis (HT) glands, but not from nonautoimmune thyroids, expressed Fas (CD95), therefore autonomous interaction between thyrocyte Fas (CD95) and FasL (CD95L) has been proposed as a major mechanism of thyrocyte depletion in HT. Moreover, experimental evidence has showed that Infiltrating T Lymphocytes (ITLs) do not express significant amounts of FasL, suggesting that ITLs are not directly involved in thyrocyte destruction.