Abstract: The present disclosure provides a pharmaceutical composition or drug kit for alleviating or treating fibrotic diseases, and a use thereof. Disclosed is a novel medication regimen in which a platelet endothelial aggregation receptor 1 (PEAR1) agonist and pirfenidone or nintedanib are used in combination.

Abstract: Disclosed is a new method for improving the quality of platelets. It is disclosed for the first time that the molecular of carnitine palmitoyl transferase II (CPT2) of the platelet mitochondrial inner membrane is critical to the survival, preparation and storage of platelets, the reduction of CPT2 protein expression and/or activity seriously affects the quality of platelets, and the normal or high expression of the protein improves the quality of platelets. By means of directly and indirectly influencing or modifying CPT2 protein, the effect of CPT2 on platelets is verified at multiple angles, and a pathway and endogenous or exogenous molecules having a key effect of maintaining activity of platelets are disclosed.

Abstract: Provided is a drug for preventing, alleviating or treating adhesion and a use thereof. A fibroblast which has been subjected to external stimulation in a body cavity contains an activated negative regulatory receptor PEAR1. The deletion of the fibroblast PEAR1 can significantly promote in vivo mucosal adhesion formation. A PEARI agonist can specifically inhibit fibroblast activation, synthesize an extracellular matrix, and ameliorate the adhesion lesion. By administering the PEARI agonist, the formation of adhesion can be effectively prevented. Also provided is a PEARI agonistic antibody that does not affect the repair and healing of normal tissue and does not cause the tissue to be in an anoxic state. Moreover, the antibody drug has a long half-life, is easily diffused, has few side effects, and has a convenient route of administration.

Abstract: The present invention provides a novel antithrombotic antibody, the antibody uses FIXa as a target and has unique properties, and specifically targets the binding site of coagulation factor FIXa and FVIIIa, reduces the formation of a FVIIa-FIXa complex, blocks the conversion of FX to FXa, and thereby exerts an antithrombotic effect. The antibody of the present invention has suitable antithrombotic properties, and has a large effective therapeutic concentration window, but does not increase the risk of bleeding in addition, the antibody can meet the needs for suitable antithrombotic performance in clinical application and for effective avoidance of problems regarding bleeding caused by excessive effects. The present invention also discloses a method for screening drugs by using an FIXa-FVIIIa binding site as a target.

Abstract: Disclosed are Pear 1 and, serving as a target of fibrotic diseases, applications in a medicament for treating human Pear 1-related diseases. Also disclosed are a Pear 1-targeting antibody or a mutant of same or a composition comprising same and applications thereof. Disclosed are a humanized Pear 1 transgenic mice model, a construction method for same, and applications thereof. The technical solution of the present invention regulates fibroblast activation and has broad application prospects in treating fibrotic diseases and accompanying debilitating diseases.