Autoimmune antibody positivity Anti-integrin antibody positivity 2021-05-02T14:41:03Z The presence of autoantibodies (immunoglobulins) in the serum that react against an integrin. Integrins are a family of cell adhesion molecules with 24 known integrin heterodimers. Integrins transduce mechanical and biochemical signals from fibrotic extracellular matrix into the cell, activate latent TGFbeta, and subsequently modulate fibroblast adhesion, migration, and growth.