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Substance P is a pluripotent neuropeptide capable of inducing neurogenic inflammation, immunoregulation, and vasodilatation. In an effort to contribute to the understanding of the pathophysiology of cerebral malaria, we have evaluated the effects of sera obtained from patients suffering from severe or mild malaria and from a healthy donor with no previous history of exposure to malaria on the expression of the substance P gene by cultured human brain microvascular endothelial cells (HBMEC) and human umbilical-vein endothelial cells. PCR, Southern blotting, hybridization with an internal probe, and densitometry demonstrated that treatment of HBMEC with sera from patients with severe malaria caused remarkably increased expression of the substance P gene. In HBMEC, substance P was not significantly influenced by serum from a healthy donor. Substance P was expressed at almost undetectable levels in untreated HBMEC. Treatment of cultured human umbilical-vein endothelial cells with the same sera produced no signal. The influence of different sera on the expression of substance P by HBMEC suggests that substance P expression may be involved in events leading to the development of severe malaria.

Sera from patients with falciparum malaria induce substance P gene expression in cultured human brain microvascular endothelial cells