PMID- 10479680 OWN - NLM STAT- MEDLINE DCOM- 19991004 LR - 20191023 IS - 1529-2401 (Electronic) IS - 0270-6474 (Linking) VI - 19 IP - 18 DP - 1999 Sep 15 TI - Neuronal interleukin-16 (NIL-16): a dual function PDZ domain protein. PG - 7770-80 AB - Interleukin (IL)-16 is a proinflammatory cytokine that has attracted widespread attention because of its ability to block HIV replication. We describe the identification and characterization of a large neuronal IL-16 precursor, NIL-16. The N-terminal half of NIL-16 constitutes a novel PDZ domain protein sequence, whereas the C terminus is identical with splenocyte-derived mouse pro-IL-16. IL-16 has been characterized only in the immune system, and the identification of NIL-16 marks a previously unsuspected connection between the immune and the nervous systems. NIL-16 is a cytosolic protein that is detected only in neurons of the cerebellum and the hippocampus. The N-terminal portion of NIL-16 interacts selectively with a variety of neuronal ion channels, which is similar to the function of many other PDZ domain proteins that serve as intracellular scaffolding proteins. Among the NIL-16-interacting proteins is the class C alpha1 subunit of a mouse brain calcium channel (mbC alpha1). The C terminus of NIL-16 can be processed by caspase-3, resulting in the release of secreted IL-16. Furthermore, in cultured cerebellar granule neurons undergoing apoptosis, NIL-16 proteolysis parallels caspase-3 activation. Cerebellar granule neurons express the IL-16 receptor CD4. Exposure of these cells to IL-16 induces expression of the immediate-early gene, c-fos, via a signaling pathway that involves tyrosine phosphorylation. This suggests that IL-16 provides an autocrine function in the brain. Therefore, we hypothesize that NIL-16 is a dual function protein in the nervous system that serves as a secreted signaling molecule as well as a scaffolding protein. FAU - Kurschner, C AU - Kurschner C AD - Department of Developmental Neurobiology, Saint Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. FAU - Yuzaki, M AU - Yuzaki M LA - eng GR - P30 CA21765/CA/NCI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Neurosci JT - The Journal of neuroscience : the official journal of the Society for Neuroscience JID - 8102140 RN - 0 (Interleukin-16) RN - 0 (Ion Channels) RN - 0 (Nerve Tissue Proteins) RN - 0 (Recombinant Proteins) RN - 0 (neuronal interleukin-16) SB - IM MH - Aging/metabolism MH - Amino Acid Sequence MH - Animals MH - Cells, Cultured MH - Cerebellum/growth & development/*metabolism MH - Cloning, Molecular MH - Gene Expression Regulation, Developmental MH - Gene Library MH - Hippocampus/growth & development/metabolism MH - Interleukin-16/*chemistry/genetics/*metabolism/pharmacology MH - Ion Channels/metabolism MH - Mice MH - Molecular Sequence Data MH - Nerve Tissue Proteins/*chemistry/genetics/*metabolism/pharmacology MH - Neurons/cytology/drug effects/*metabolism MH - Recombinant Proteins/chemistry/metabolism MH - Saccharomyces cerevisiae PMC - PMC6782450 EDAT- 1999/09/10 00:00 MHDA- 1999/09/10 00:01 CRDT- 1999/09/10 00:00 PHST- 1999/09/10 00:00 [pubmed] PHST- 1999/09/10 00:01 [medline] PHST- 1999/09/10 00:00 [entrez] PST - ppublish SO - J Neurosci. 1999 Sep 15;19(18):7770-80.