ATP stimulates the proliferation of MCF-7 cells through the PI3K/Akt signaling pathway

Area of Science:

• Cellular signaling
• Molecular biology
• Cancer research

Background:

• The PI3K/Akt pathway is crucial in cell proliferation and survival.
• Extracellular nucleotides, like ATP, can act as signaling molecules.
• MCF-7 cells are a common model for breast cancer research.

Purpose of the Study:

• To investigate how ATP modulates the PI3K/Akt signaling pathway in MCF-7 cells.
• To identify the specific receptors and downstream signaling molecules involved in ATP's effects.
• To determine the role of calcium in ATP-induced Akt activation and cell proliferation.

Main Methods:

• Western blot analysis to detect protein phosphorylation.
• Use of specific inhibitors for PI3K, PLC, PKC, Src, and MAPKs.
• Nucleotide treatment and cell proliferation assays.
• Calcium imaging and manipulation experiments.

Main Results:

• ATP dose- and time-dependently stimulated Akt phosphorylation, suggesting P2Y(2/4) receptor involvement.
• PI3K, PLC, PKC, Src, and intracellular calcium release were essential for ATP-induced Akt phosphorylation.
• MAPKs phosphorylation was not affected by PI3K inhibition.
• ATP and UTP promoted MCF-7 cell proliferation, which was blocked by inhibitors of multiple signaling pathways.

Conclusions:

• ATP activates the PI3K/Akt pathway in MCF-7 cells through P2Y(2/4) receptors, involving PLC/IP(3)/Ca(2+), PKC, and Src.
• This signaling cascade leads to increased MCF-7 cell proliferation.
• The study elucidates a novel mechanism of nucleotide-mediated cancer cell growth.