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Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...

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Switchable Enzyme-Regulated ECM-Integrin-Cholesterol Signaling Orchestrate PD-L1 Dual Destabilization for Boosting

Wenbo Yin1,2, Yue Wang3, Zonghang Liu4

  • 1State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel nanoplatform that degrades the tumor extracellular matrix and depletes cholesterol to overcome resistance to PD-1/PD-L1 cancer immunotherapy, leading to tumor eradication.

Keywords:
PD‐L1 regulationcholesterol depletionimmunotherapytumor extracellular matrix remodeling

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Area of Science:

  • Biomedical Engineering
  • Cancer Immunology
  • Nanomedicine

Background:

  • Immunosuppressive tumor microenvironment limits PD-1/PD-L1 blockade therapy efficacy in solid tumors.
  • Tumor extracellular matrix (ECM), integrin signaling, and cholesterol promote immune evasion by upregulating PD-L1.
  • A self-reinforcing ECM-integrin-cholesterol network drives resistance to cancer immunotherapy.

Purpose of the Study:

  • To design a switchable nanoplatform to disrupt the ECM-integrin-cholesterol signaling network.
  • To overcome resistance to PD-1/PD-L1 blockade therapy in solid tumors.
  • To enhance T cell infiltration and eradicate advanced tumors.

Main Methods:

  • Developed a nanoplatform co-delivering papain (enzyme) and simvastatin (cholesterol inhibitor).
  • Papain activated by tumor glutathione and photothermal heating to degrade ECM and suppress PD-L1.
  • Simvastatin depleted cholesterol to destabilize integrin clusters and promote PD-L1 degradation.
  • Combined therapy with phototherapy-induced immunogenic cell death.

Main Results:

  • The nanoplatform successfully degraded ECM, suppressed integrin signaling, and reduced PD-L1 levels.
  • Simvastatin enhanced the therapeutic effect by depleting cholesterol and destabilizing integrin clusters.
  • Combined therapy remodeled the tumor microenvironment, increasing T cell infiltration.
  • Achieved complete eradication of advanced tumors (approximately 500 mm³).

Conclusions:

  • The designed nanoplatform effectively disrupts the immunosuppressive ECM-integrin-cholesterol network.
  • This multi-pronged strategy overcomes resistance to PD-1/PD-L1 blockade and enhances immunotherapy efficacy.
  • The approach shows promise for treating advanced solid tumors by remodeling the tumor microenvironment and promoting tumor eradication.