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Macrophages live on, and no one had known why until the publication of two papers by one medic team. They discovered that a molecule called PTEN (phosphatase and tensin homologue deleted on chromosome 10) normally interferes with Akt signaling, and thus, limits cell lifespan. That is unless something interferes with PTEN. In a series of experiments, the team observed that the presence of HIV tat in infected macrophages lowers PTEN levels by 40 percent, enabling the PI3K/Akt pathway to kick back on and keep macrophages alive. The study also found that an existing drug, miltefosine (Impavido®), inhibits PI3K/Akt pathway, and thus, promises to counter the effect of HIV tat on PTEN. And other drugs at comprar viagra
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