APP displays marked activity that modulates lymphocytes and macrophages in various situations. APP promotes cell proliferation and IFN-γ secretion by lymphocytes, and increases NO and TNF-α production by LPS-induced macrophages. Accordingly, the authors posit that APP can effectively strengthen the immune response of its host. Further studies could be undertaken to clone the gene of APP and to study its molecular mechanism and effects in vivo to elucidate the natural effects of APP on the human body and other medicinal applications.