Arterial calcification due to CD73 deficiency

Arterial Calcification due to CD73 Deficiency (ACDC) is a rare genetic disorder characterized by the calcification of the arteries, which are the blood vessels that carry oxygenated blood from the heart to the rest of the body. This condition leads to decreased elasticity of the arteries, which can cause a range of cardiovascular issues. ACDC is caused by mutations in the NT5E gene, which encodes the enzyme CD73. This enzyme plays a crucial role in producing adenosine, a molecule involved in various physiological processes including the inhibition of arterial calcification.

Symptoms and Diagnosis

The primary symptom of ACDC is the progressive calcification of the arteries, particularly those in the lower extremities, leading to decreased blood flow. This can result in claudication, which is pain caused by insufficient blood flow during exercise, and in severe cases, can lead to critical limb ischemia. Patients may also experience episodes of chest pain due to the involvement of coronary arteries. Diagnosis of ACDC is typically based on the clinical presentation and imaging studies that reveal extensive arterial calcification in the absence of traditional cardiovascular risk factors. Genetic testing confirming a mutation in the NT5E gene is definitive.

Pathophysiology

The pathophysiology of ACDC revolves around the loss of function of the CD73 enzyme due to mutations in the NT5E gene. CD73 is responsible for the conversion of AMP (adenosine monophosphate) to adenosine, which has anti-inflammatory and anti-calcific properties. The deficiency of CD73 leads to a decrease in adenosine levels, promoting inflammation and calcification in the arterial walls.

Treatment

There is no cure for ACDC, and treatment is primarily supportive and aimed at managing symptoms and preventing complications. This may include medications to improve blood flow and reduce pain, as well as interventions to manage cardiovascular risk factors. In severe cases, surgical procedures such as angioplasty or bypass surgery may be necessary to restore blood flow to affected limbs.

Epidemiology

ACDC is an extremely rare condition, with only a few documented cases worldwide. It affects both males and females and has been reported in individuals of various ethnic backgrounds.

Research Directions

Research on ACDC is focused on understanding the molecular mechanisms underlying the disease and developing targeted therapies. Studies exploring the therapeutic potential of adenosine receptor agonists or gene therapy to restore CD73 function are of particular interest.

NIH genetic and rare disease info

• NIH info on Arterial calcification due to CD73 deficiency

Arterial calcification due to CD73 deficiency is a rare disease.