Is Henoch-Schönlein purpura nephritis hereditary?

IgA vasculitis–associated nephritis (also known as Henoch-Schönlein purpura nephritis) is an inflammatory renal condition primarily triggered by IgA vasculitis (Henoch-Schönlein purpura), and is closely associated with the body’s own immune response. So, is IgA vasculitis–associated nephritis hereditary? The details are as follows:

IgA vasculitis–associated nephritis is one of the most challenging forms of IgA vasculitis to treat. It results from deposition of immune complexes in the kidneys secondary to IgA vasculitis, leading to renal injury. However, it is not hereditary and does not exhibit a genetic predisposition.

Firstly, the skin rash in patients with IgA vasculitis–associated nephritis manifests as hemorrhagic, symmetric, erythematous maculopapular lesions, commonly distributed on the lower extremities—particularly around the ankles and knees—and occasionally involving the buttocks and upper limbs. Gastrointestinal involvement typically presents as abdominal pain, accompanied by nausea, vomiting, and hematochezia; hematemesis may rarely occur.

In children, IgA vasculitis–associated nephritis may be complicated by intussusception, intestinal obstruction, or intestinal perforation. Hypertension induced by IgA vasculitis–associated nephritis accounts for approximately 20% to 40% of all hypertension cases in affected individuals; blood pressure elevation is usually mild to moderate. Hypertension is often detected concurrently with urinary abnormalities; however, the majority of patients with IgA vasculitis–associated nephritis recover relatively quickly.

Regarding pharmacotherapy, avoid medications that reduce platelet count—such as cephalosporins, quinine, sodium aminosalicylate, rifampin, aspirin, digoxin, quinidine, sulfonamides, and promethazine—as well as agents that inhibit platelet function—including dipyridamole and dextran.