not sure why this is in the immune system category but Igepal is the tradename for a series of poly(oxyethylene) alkyl ethers. Commonly used as a non-ionic surfactant, especially in micelle synthesis.
Some examples of nonionic soaps include glycerin soaps, castile soaps, and nonionic surfactant-based cleaning products. These soaps do not contain charged ions and are often milder on the skin compared to traditional soaps containing ionic surfactants.
It dissolves the cell mebrane. Keep in mind that some people do not use Triton X-100 in cell lysis, but instead sonificate... Also Triton X-100 can be replaced by a whole lot of other stuff (CHAPS, Igepal, etc) Hope to have givin you enough info