Abstract
d-erythro-neopterin is excreted in high amounts from human monocytes/macrophages responding to stimulation with gamma interferon. In vivo, the determination of neopterin offers a convenient possibility for monitoring the activation state of the cell-mediated immune system. Neopterin concentrations in body fluids also are raised with high sensitivity in viral diseases, irrespective of the specific nature of the virus. Thus, neopterin concentrations also are raised in viral diseases the causative agent of which has not yet been characterized such as non-A, non-B hepatitis. Determination of neopterin concentrations is easily accomplished by Chromatographic or immunological techniques. Clinical studies showing the behaviour of neopterin levels in viral diseases are reviewed with special emphasis laid on the behaviour of neopterin concentrations in body fluids during virus-induced liver diseases, particularly non-A, non-B hepatitis. The possibilities offered by this marker to reduce the risk of disease transmission via transfusion of blood or blood components are discussed.
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