C-terminal endostatin polypeptides are disclosed herein. In some embodiments, these polypeptides include or consist of (1) at least at least 40 consecutive amino acids of the amino acid sequence set forth as amino acids 133-180 of SEQ ID NO: 2, SEQ ID NO: 13 or SEQ ID NO: 4； (2) at least 40 consecutive amino acids of the amino acid sequence set forth as amino acids 133-180 of SEQ ID NO: 2, SEQ ID NO: 13 or SEQ ID NO: 4 with at most 5 amino acid substitutions, (3) the amino acid sequence set forth as amino acids 133-180 of SEQ ID NO: 2, SEQ ID NO: 13 or SEQ ID NO: 4； or (4) the amino acid sequence set forth as amino acids 133-180 of SEQ ID NO: 2, SEQ ID NO: 13 or SEQ ID NO: 4 with at most 5 amino acid substitutions； wherein the polypeptide has anti-fibrotic activity and wherein the polypeptide does not comprise amino acids 1-92 of SEQ ID NO: 2, SEQ ID NO: 13 or SEQ ID NO: 4. Polynucleotides encoding these polypeptide, host cells transformed with the polynucleotides, and methods of using these polypeptides and polynucleotides are disclosed. Uses of these polypeptide, polynucleotides and expression vectors include the treatment of fibrosis in a subject. Thus, methods are provided for treating fibrosis, including fibrosis of the skin and/or the lung.
