The present invention relates to
activin receptor IIA type variants and methods of use thereof. The present invention features a polypeptide comprising an
extracellular ActRIIa variant. In some embodiments, the polypeptides of the present invention comprise an
extracellular ActRIIa variant fused to an
Fc domain monomer or part. The invention also features the use of said polypeptides for the treatment of diseases and conditions involving
bone injury, such as
primary osteoporosis,
secondary osteoporosis,
osteopenia, osteosclerosis, fracture,
bone cancer or
cancer metastasis-associated bone loss, Paget's
disease, renal bone dystrophy, treatment-associated bone loss, diet-associated bone loss,
osteoporosis-associated bone loss,
osteoporosis-associated bone loss,
osteoporosis-associated bone loss, osteoporosis-associated bone loss, osteoporosis-associated bone loss, osteoporosis-associated bone loss, osteoporosis-associated bone loss, osteoporosis-associated bone loss, and osteoporosis-associated bone loss. Pharmaceutical compositions and methods for treating bone loss associated with
obesity treatment,
low gravity associated bone loss, or immobility associated bone loss.