Provided are ADAM9 modulating peptides and methods for using the same to modulate ADAM9 biological activities in vitro and/or in vivo, to inhibit ADAM9 biological activities associated with diseases or disorders in subjects, to decrease inflammation, and to inhibit undesirable cellular proliferation, fibrosis, and angiogenesis. in some embodiments, the ADAM9 modulating peptides include modifications of one or more amino acids of the human ADAM9 prodomain amino acid sequence, and in some embodiments the ADAM9 modulating peptides include other modifications such as but not limited to the addition of PEG groups.
