Twisted is not a WSGI application; it's an engine for exposing objects to the network. If you imagine a stack of technologies serving your web site, Twisted is squarely below Django in the stack. Asking how to serve Twisted from within Django is a bit like asking how to serve Linux from within Django.
You may, however, be interested in Crochet, which provides an easy-to-use, convenience layer for calling Twisted APIs from within Django code, among other things.