Abstract: The disclosure of the present application relates to a secretory deleted split hand/split foot 1 (sDSS1) protein, the amino acid sequence thereof, the nucleic acid sequence thereof, and the applications of the same. The sDSS1 protein is a secretory protein from higher primate, and can be detected in human serum and cerebral spinal fluid (CSF). The sDSS1 protein can form conjugate with oxidized protein under nonenzymatic condition or with amyloid-beta (A?) polypeptide to reduce formation of A? oligomer. The addition of sDSS1 protein to culture medium can shield the cytotoxicity induced by oxidized protein, A? oligomer, amylin oligomer and glycosylated protein, so as to protect the cells against these toxoproteins. The sDSS1 protein can prolong survival time of senescence-accelerated mice significantly.

Abstract: The disclosure of the present application relates to a secretory deleted split hand/split foot 1 (sDSS1) protein, the amino acid sequence thereof, the nucleic acid sequence thereof, and the applications of the same. The sDSS1 protein is a secretory protein from higher primate, and can be detected in human serum and cerebral spinal fluid (CSF). The sDSS1 protein can form conjugate with oxidized protein under nonenzymatic condition or with amyloid-beta (A?) polypeptide to reduce formation of A? oligomer. The addition of sDSS1 protein to culture medium can shield the cytotoxicity induced by oxidized protein, A? oligomer, amylin oligomer and glycosylated protein, so as to protect the cells against these toxoproteins. The sDSS1 protein can prolong survival time of senescence-accelerated mice significantly.