Intracellular localization of the migration inhibitory factor (MIF) in a long-term human lymphoid cell line.

Subcellular fractions of the human lymphoid cell line PGLC-33H were obtained by N2 cavitation and differential centrifugation. The purity of the fractions was assessed by the use of the following marker enzymes: beta-glucuronidase for the lysosomal-intermediate fraction; a nonspecific esterase for the microsomal fraction; and LDH for the supernatant fraction. These subcellular fractions were studied for MIF activity utilizing human lymphoid cells from established lines as target cells.

Host responses to Epstein-Barr virus and cytomegalovirus infection in leprosy.

A study was undertaken in patients with leprosy to assess the contribution of cell-mediated immunity to the host response to Epstein-Barr virus (EBV) and cytomegalovirus (CMV) infection. Sixteen of 72 patients (22%) with lepromatous leprosy, with impaired cellular immunity, had anti-EBV titers of 1,640 or higher. Only 4 of 49 patients (8%) with tuberculoid leprosy, with intact cell-mediated immunity, attained the level of 1:640.