An antibody-conjugated nanoparticle, 50 to 1000 nm in size, containing an anti-Mullerian hormone receptor II (AMHRII) antibody that is conjugated to a nanocomplex formed of a lipid-based delivery agent and a cytotoxin, the delivery agent and the cytotoxin being non-covalently bonded to each other. Also disclosed are a method of preparing such an antibody-conjugated nanoparticle and use thereof for inducing sterilization in a subject and for treating an AMHRII-associated condition.