Netrin 1 (Netrin 1, Ntn1, NTN1L, Unc6)

Semaphorins, neuropilins and netrins are among a number of molecules and their receptors that regulate the developing nervous system to guide the development of neural circuits.1 Although first identified as axon guidance cues,2,3 it is now apparent that many of these same factors are not limited to the guidance of growing axons, but have roles in a range of processes from the guidance of cell migration to the regulation of the immune response, angiogenesis, lung branching morphogenesis, nervous system regeneration, and cancer.4-9\nThe semaphorins make up the largest family of axon guidance cues. They are characterized by the presence of an approximately 500 amino acid N-terminal semaphorin (Sema) domain. Semaphorins function mainly as chemorepellents that direct axons away from tissues.3 Semaphorin 3A (Sema3A) has been shown to be repellent to cortical axons and to inhibit axon branching.10 The transmembrane protein semaphorin 6A has been shown to repel embryonic sympathetic axons.11 The actions of the various semaphorins are not always similar. Semaphorin 3A has been found to inhibit tumor development whereas semaphorin 6A may contribute to tumor progression.9\nNeuropilins are the ligand binding moieties in the class 3 Semaphorin receptor complexes that subsequently activate signaling through associated plexins. Two types have been identified so far: Neuropilin-1 (Npn-1) and Neuropilin-2 (Npn-2) receptors. At the amino acid sequence level, Npn-1 and Npn-2 share 44% identity. Npn-1 and Npn-2 show different expression patterns in developing neurons of the central and peripheral nervous systems, and show different binding specificities for different members of he semaphorin family. Both also function as receptors for some forms of vascular endothelial growth factor (VEGF).12 \nNetrins are a family of laminin-related small proteins that are involved in axon guidance and eurite outgrowth. Netrin-1 has been shown to attract cortical growth cones and promote axon branching.10 Netrin-4 (first named b-netrin) was found to promote neurite elongation from olfactory bulb explants.\n\nApplications: \nSuitable for use in ELISA. Other applications not tested.\n\nRecommended Dilution:\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. For long-term storage and to avoid repeated freezing and thawing, aliquot Store at -20 degrees C. Aliquots are stable for at least 12 months at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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