Resveratrol arrests the cell division cycle at S/G2 phase transition

Area of Science:

• * Pharmacology
• * Cell Biology
• * Biochemistry

Background:

• * Resveratrol (3,5,4'-trihydroxystilbene) is a natural phytoalexin found in grapes and wine.
• * It exhibits diverse pharmacological effects.
• * Its impact on cell proliferation and differentiation requires further investigation.

Purpose of the Study:

• * To investigate the effects of resveratrol on HL-60 cell proliferation and differentiation.
• * To elucidate the cell cycle mechanisms underlying resveratrol's activity.

Main Methods:

• * Treatment of HL-60 cells with varying concentrations of resveratrol.
• * Cell proliferation assessed via cell counting.
• * Differentiation evaluated by observing phenotypic changes.
• * Cell cycle analysis using flow cytometry.
• * Biochemical analysis of cell cycle regulatory proteins (cyclins, cdc2).

Main Results:

• * Resveratrol (≥30 μM) completely arrested HL-60 cell proliferation.
• * Induced differentiation towards a myelo-monocytic phenotype.
• * Caused cell accumulation in G1 and S phases, with no G2/M peak.
• * Showed minimal apoptosis at effective concentrations.
• * Resveratrol induced S phase arrest by increasing cyclins A and E and accumulating inactive phosphorylated cdc2, without affecting the G1 phase.

Conclusions:

• * Resveratrol effectively inhibits HL-60 cell proliferation and promotes differentiation.
• * It induces a reversible cell cycle arrest specifically at the S phase checkpoint.
• * The mechanism involves modulation of key cell cycle regulators, offering potential therapeutic insights.