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Alpha-internexin is a Class IV intermediate filament, related to but distinct from the better known neurofilament triplet proteins, NF-L, NF-M and NF-H. It is expressed only in neurons and in large amounts early in neuronal development, but is down-regulated in many neurons as development procedes. However, many classes of mature neurons contain alpha-internexin in addition to NF-L, NF-M and NF-H, and some mature neurons only express the alpha-internexin subunit of neurofilament.
The very early developmental expression of alpha-internexin suggests that its presence is an early and convenient diagnostic feature of neuronal progenitors cells and other cell committed to the neuronal lineage. Therefore, alpha-internexin antibodies serve as unique probes to study and classify neuronal types and follow their processes in tissue sections and culture.
