Pathophysiology of Sickle Cell Disease

Area of Science:

• Hematology
• Molecular Biology
• Pathophysiology

Background:

• Sickle cell disease (SCD) originates from a single amino acid substitution in the β-globin chain, causing mutant hemoglobin S polymerization.
• This polymerization impairs red blood cell function, leading to hemolytic anemia and vaso-occlusion, resulting in tissue damage.

Purpose of the Study:

• To provide a comprehensive review of the molecular pathophysiology of sickle cell disease.
• To elucidate how SCD pathophysiology contributes to central nervous and cardiopulmonary complications.
• To highlight how this understanding informs the development of current and future therapies.

Main Methods:

• Review of current scientific literature on sickle cell disease.
• Analysis of molecular, cellular, and biophysical processes involved in SCD.
• Examination of therapeutic targets based on disease mechanisms.

Main Results:

• SCD pathophysiology is characterized by a cycle of hemoglobin S polymerization, impaired biorheology, hemolysis-induced endothelial dysfunction, and sterile inflammation.
• These processes synergistically cause acute and chronic pain, and end-organ injury.
• Vaso-occlusion and hemolysis promote inflammation and vasculopathy, affecting small and large vessels.

Conclusions:

• Targeted molecular therapies are advancing due to a deeper understanding of SCD pathogenesis.
• The vicious cycle of SCD involves key processes amenable to therapeutic intervention.
• Further research into SCD's molecular mechanisms is crucial for developing effective treatments.