Analog of Somatostatin Vapreotide Exhibits Biological Effects in vitro via Interaction with Neurokinin-1 Receptor

作者：Spitsin Sergei; Tuluc Florin; Meshki John; Lai Jian Ping; Tustin Richard III; Douglas Steven D^*

来源：Neuroimmunomodulation, 2013, 20(5): 247-255.

DOI：10.1159/000350468

• Substance P
• Neurokinin-1 receptor
• Somatostatin
• Vapreotide
• HIV
• Somatostatin 2 receptor
• Cyanamid-154806

Objectives: Vapreotide, a synthetic analog of somatostatin, has analgesic activity most likely mediated through the blockade of neurokinin-1 receptor (NK1R), the substance P (SP)-preferring receptor. The ability of vapreotide to interfere with other biological effects of SP has yet to be investigated. Methods: We studied the ability of vapreotide to antagonize NK1R in three different cell types: immortalized U373MG human astrocytoma cells, human monocyte-derived macrophages (MDM) and a human embryonic kidney cell line, HEK293. Both U373MG and MDM express endogenous NK1R while HEK293 cells, which normally do not express NK1R, are stably transformed to express human NK1R (HEK293-NK1R). Results: Vapreotide attenuates SP-triggered intracellular calcium increases and nuclear factor-kappa B activation in a dose-dependent manner. Vapreotide also inhibits SP-induced interleukin-8 and monocyte chemotactic protein-1 production in HEK293-NK1R and U373MG cell lines. Vapreotide inhibits HIV-1 infection of human MDM in vitro, an effect that is reversible by SP pretreatment. Conclusions: Our findings indicate that vapreotide has NK1R antagonist activity and may have a potential application as a therapeutic intervention in HIV-1 infection.

• 出版日期2013