Sperm-associated antigen 9 (SPAG9)

Sperm-associated antigen 9 (SPAG9) is a scaffold protein encoded by the SPAG9 gene, classified as a cancer-testis antigen. It structurally organizes mitogen-activated protein kinases (MAPKs) and mediates c-Jun N-terminal kinase (JNK) signaling, functioning as a key modulator in signal transduction. SPAG9 facilitates the formation of functional JNK signaling complexes, binds to kinesin-1, and is implicated in microtubule-based transport, which may contribute to tumor growth, invasion, and development. It is highly expressed in several cancers (lung, cervical, bladder) and testicular germ cells, and is recognized as an autoantigen, provoking a strong humoral immune response in cancer patients. SPAG9 expression and related serum autoantibodies have shown promise as biomarkers for cancer diagnosis and patient monitoring[1][2][3][4][6].

Other names

JIP-4JIP4Mitogen-activated protein kinase 8-interacting protein 4Cancer/testis antigen 89CT89PHETPIG6HSSJLPKIAA0516SYD1HLC4HLC-4HLC-6HLC6Sunday driver 1JNK-interacting protein 4JNK-associated leucine-zipper proteinMax-binding proteinProtein highly expressed in testisSperm surface proteinSperm-specific proteinProliferation-inducing gene 6Human lung cancer oncogene 6 proteinLung cancer oncogene 4MGC117291MGC14967MGC74461FLJ13450FLJ14006FLJ26141FLJ34602

No specific therapeutic mechanisms reported for drugs directly targeting SPAG9; potential therapeutic approaches involve immune response/autoantibody induction in cancer contexts.