Sotatercept: A Crosstalk Between Pathways and Activities in the Pulmonary Circulation and Blood

Sotatercept, selectively binds free activins and growth differentiation factors by reproducing the binding domain of the activin receptor type IIA (ACTRIIA). The sequester of activins blunts the downstream signaling pathway, resulting in the reactivation of the bone morphogenic protein (BMP) receptor type 2 signaling and in inhibition of pathological remodeling in the pulmonary circulation. The balance between proliferative and antiproliferative pathways is restored, with a favorable impact on the progression of pulmonary arterial hypertension (PAH). Sotatercept, first approved for the treatment of hematological disorders such anemia, has recently received approval as a drug in the treatment of group 1 PAH, either in United States and Europe. In this review, we will discuss the application of sotatercept, and its cross reactivity in function alone or in drug combination with other drugs currently used in PAH. We will try also to further discuss what is known regarding the hematological effects of sotatercept, both from a preclinical and clinical studies point of view, since they are the root of the side effects seen in PAH trials, such as bleeding and increased hemoglobin.