How Blood Platelets Influence Cancer Cells to Promote Inflammation and Spread

Greg Howard
19th March, 2025

How Blood Platelets Influence Cancer Cells to Promote Inflammation and Spread

Platelet interaction with pancreatic cancer cells increases cellular dry mass and proliferation (a–c), while platelets themselves exhibit minimal GALNT family glycosyltransferase activity and negligible GALNT3 expression compared to cancer cells (d–g), indicating that platelet-induced compositional changes in cancer cells occur through mechanisms other than direct GALNT transfer.

Image adapted from: Langiu et al. / CC BY (Source)

Key Findings

  • In France, researchers found that blood platelets transfer substances to colorectal and pancreatic cancer cells, making them more aggressive
  • This transfer alters the cancer cells' genes, increasing their ability to grow and spread
  • Targeting these platelet-cancer interactions could lead to new treatments to help cancer patients
Cancer patients face numerous challenges, one of the most severe being the increased risk of blood clots, a condition known as cancer-associated thrombosis. This complication occurs four to seven times more frequently in cancer patients compared to the general population[1]. Such thrombotic events not only contribute directly to patient mortality but also complicate cancer treatment and prognosis. Thrombosis in cancer patients is often linked to the activation of platelets by tumor cells. Platelets, which are small blood cells responsible for clotting, play a crucial role in the body’s response to injury. However, in the context of cancer, their activation can lead to an unhealthy increase in clot formation. This phenomenon, part of what is known as Trousseau's syndrome, has been recognized since the 19th century[2]. Over time, the understanding of this syndrome has expanded to include various mechanisms by which cancer can induce a hypercoagulable state, increasing the risk of both venous and arterial thrombosis[2][3][4]. A recent study conducted by researchers at Aix Marseille University in France has shed new light on the intricate relationship between platelets and cancer cells. The team focused on colorectal and pancreatic cancers, two types known for their association with high thrombotic risk. Their research revealed that platelets do more than just contribute to clot formation; they actively "educate" cancer cells. This education involves the transfer of lipids, RNAs, and proteins from platelets to cancer cells, leading to significant changes in the cancer cells’ behavior. One of the groundbreaking findings of this study is that platelets can induce changes in the transcription of genes related to glycosylation, inflammation, and metastasis within cancer cells. Glycosylation is the process by which sugars are chemically attached to proteins, affecting their function and location in the body. Changes in glycosylation patterns can influence how cancer cells interact with their environment, potentially making them more aggressive and prone to spreading. Inflammation within tumors is another critical factor that can promote cancer progression and resistance to treatment. By altering gene expression related to these processes, platelets effectively enhance the cancer cells' ability to grow and spread. The methods used in this study involved analyzing the genetic and protein changes in cancer cells after exposure to platelet-derived factors. Advanced techniques such as gene sequencing and protein assays allowed the researchers to identify specific alterations in the cancer cells' transcriptional profiles. These changes were linked to pathways involved in inflammation and metastasis, providing a clear mechanism by which platelets influence cancer progression. This study builds on earlier research that has established the connection between cancer and thrombotic events. For instance, Trousseau's syndrome was initially identified as a paraneoplastic phenomenon, where unexplained blood clots were a sign of hidden internal cancers[2]. Subsequent studies expanded this concept, showing that various types of malignant tumors could trigger a hypercoagulable state through different mechanisms[2][3]. The current research adds another layer to this understanding by demonstrating a direct genetic impact of platelets on cancer cells, highlighting a bidirectional communication between these two cell types. Moreover, the study aligns with findings that suggest platelet interactions with cancer cells can influence metastasis. Previous research has indicated that platelets can protect circulating tumor cells from the immune system and aid in their attachment to distant sites for metastasis[5]. The new study extends this idea by showing that platelets can also modulate the genetic makeup of cancer cells, making them more adept at spreading and establishing new tumors. Understanding the role of platelets in cancer progression opens up potential avenues for therapy. Current treatments for cancer-associated thrombosis often involve anticoagulants like heparins, which help prevent clot formation[2]. However, these treatments do not address the underlying interactions between platelets and cancer cells. The insights from this study suggest that targeting the specific molecules involved in platelet education of cancer cells could disrupt this harmful communication. For example, drugs that inhibit the transfer of lipids, RNAs, or proteins from platelets to cancer cells might reduce the ability of cancer cells to become more aggressive and metastatic. Additionally, this research highlights the importance of personalized medicine in cancer treatment. Since the risk of thrombotic events varies with different types of cancer and their stages[4], therapies could be tailored based on the specific interactions between platelets and the cancer type. For instance, pancreatic cancer, known for its high thrombotic risk, might benefit more from treatments that specifically target platelet-mediated genetic changes in cancer cells[4]. Future studies will likely explore the detailed pathways through which platelets influence gene transcription in cancer cells and identify potential drug targets within these pathways. Clinical trials could then assess the efficacy of these targeted therapies in reducing both thrombosis and cancer progression. By addressing both the coagulation issues and the direct impact on cancer cells, such treatments could significantly improve outcomes for patients with cancer-associated thrombosis. In conclusion, the research from Aix Marseille University provides vital new insights into the complex relationship between platelets and cancer cells. By uncovering how platelets can alter the genetic landscape of cancer cells, the study opens up promising new strategies for treating cancer and its complications. This advancement underscores the critical need for continued research into the multifaceted interactions within the tumor microenvironment, aiming to develop more effective and comprehensive cancer therapies.

MedicineHealthBiochem

References

Main Study

1) Consequences of platelet-educated cancer cells on the expression of inflammatory and metastatic glycoproteins

Published 17th March, 2025

https://doi.org/10.1371/journal.pone.0317096

Related Studies

2) Trousseau's syndrome: multiple definitions and multiple mechanisms.

Journal: Blood, Issue: Vol 110, Issue 6, Sep 2007

3) Venous thromboembolism and prognosis in cancer.

https://doi.org/10.1016/j.thromres.2009.12.023

4) Platelet and Cancer-Cell Interactions Modulate Cancer-Associated Thrombosis Risk in Different Cancer Types.

https://doi.org/10.3390/cancers14030730

5) Aspirin and antiplatelet treatments in cancer.

https://doi.org/10.1182/blood.2019003977


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