Pulmonary hypertension

1. A method for treating and reversing the symptoms of pulmonary hypertension in a subject, comprising:

administering to the subject having pulmonary hypertension an effective amount of an antagonistic antibody, or an active antigen binding antibody fragment thereof, that binds to an amino acid sequence having at least 95% sequence identity to the amino acid sequence shown in SEQ ID NO: 1 and inhibits osteoprotegerin (OPG) protein activity, thereby treating and reversing the symptoms of pulmonary hypertension in the subject.

2. The method according to claim 1 , wherein said antagonistic antibody is a polyclonal antibody.

3. The method according to claim 1 , wherein said antagonistic antibody is a monoclonal antibody.

4. The method according to claim 1 , wherein said active antigen binding antibody fragment is selected from the group consisting of: Fab, Fab 2 , F(ab′) 2 , Fv, Fc, Fd, and single chain antibody fragment.

5. The method according to claim 1 , wherein said antagonistic antibody is a chimeric antibody.

6. The method according to claim 1 , wherein said antagonistic antibody is a humanized or human antibody.

7. The method according to claim 1 , wherein said antagonistic antibody or active antigen binding antibody fragment binds the ligand binding domain of OPG.

8. The method according to claim 1 , further comprising administering to the subject an effective amount of at least one additional agent effective in the treatment of pulmonary hypertension.

9. The method according to claim 8 , wherein said additional agent is selected from the group: calcium channel blockers, diuretics, endothelin receptor antagonists, prostacyclins, soluble guanalate cyclase and phosphodiesterase inhibitors.

10. The method according to claim 1 , wherein the pulmonary hypertension is selected from the group consisting of: pulmonary arterial hypertension and PH associated with lung disease.

11. The method of claim 1 , wherein the subject is a human subject.