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Cucurbitacins elicit anti-platelet activity via perturbation of the actin cytoskeleton and integrin function.

Kriek, Neline and Nock, Sophie and Sage, Tanya and Khalifa, Badrija and Bye, Alex P and Mitchell, Joanne and Thomson, Steven and McLaughlin, Mark and Jones, Sarah and Gibbins, Jonathan and Unsworth, Amanda (2021) Cucurbitacins elicit anti-platelet activity via perturbation of the actin cytoskeleton and integrin function. Thrombosis and Haemostasis. ISSN 0340-6245 (In Press)

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Abstract

Cucurbitacins are dietary compounds that have been shown to elicit a range of anti-tumour, anti-inflammatory and anti-atherosclerotic activities. Originally identified as STAT inhibitors, a variety of mechanisms of action have since been described, including dysregulation of the actin cytoskeleton and disruption of integrin function. Integrin outside-in signalling and cytoskeletal rearrangements are critical for the propagation of stable thrombus formation and clot retraction following platelet adhesion at the site of vessel damage. The effects of cucurbitacins on platelet function and thrombus formation are unknown. We report for the first time anti-platelet and anti-thrombotic effects of cucurbitacins B, E and I in human platelets. Treatment of platelets with cucurbitacins resulted in attenuation of platelet aggregation and fibrinogen binding following stimulation by ADP, TRAP6, collagen and CRP-XL. Interestingly no alterations in alpha-granule secretion and mobilisation of intracellular cytosolic calcium were observed following treatment with cucurbitacins. Cucurbitacins were also found to potently inhibit other integrin- and cytoskeleton-mediated events, including adhesion, spreading and clot retraction. Further investigation of cytoskeletal dynamics found treatment with cucurbitacins altered cofilin phosphorylation, enhanced activation, and increased F actin polymerisation and microtubule assembly. Disruption to cytoskeletal dynamics has previously been shown to impair integrin activation, platelet spreading and clot retraction. Anti-platelet properties of cucurbitacins were found to extend to a disruption of stable thrombus formation, with an increase in thrombi instability and de-aggregation under flow. Our research identifies novel, anti-platelet and anti-thrombotic actions of cucurbitacins that appear to be linked to dysregulation of cytoskeletal dynamics and integrin function.

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