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Related Concept Videos

Cancer Therapies02:49

Cancer Therapies

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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
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Targeted Cancer Therapies02:57

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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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Related Experiment Video

Updated: Jan 30, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Proton-Activated Artificial Channels for pH-Selective Cancer Therapy.

Daoxin Luo1,2, Chunyan Jia1,2, Yuchao Lin1

  • 1Fujian Provincial Key Laboratory of Innovative Drug Target Research, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian, China.

Angewandte Chemie (International Ed. in English)
|January 29, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed novel proton-activated artificial ion channels using self-assembled peptides. These channels show enhanced cancer cell killing in acidic tumor environments, offering a promising platform for targeted cancer therapy.

Keywords:
H‐bondsartificial ion channelsnanoporesstimuli‐responsive ion channelssupramolecular chemistry

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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Area of Science:

  • Biomaterials Science
  • Chemical Biology
  • Nanotechnology

Background:

  • Proton-activated ion channels are crucial for cellular adaptation to acidic environments.
  • Mimicking these channels artificially presents significant challenges in biomaterial design.

Purpose of the Study:

  • To create novel proton-activated artificial ion channels.
  • To investigate their potential for selective cancer therapy in acidic tumor microenvironments.

Main Methods:

  • Self-assembled peptide chains were integrated into a pH-responsive 2,2'-bipyridine scaffold.
  • Protonation-induced conformational changes drove channel formation and small molecule transport.
  • Cytotoxicity and selectivity assays were performed on human colorectal carcinoma cells.

Main Results:

  • The artificial ion channels demonstrated pH-dependent functionality, with increased cytotoxicity at lower pH.
  • The C-FF channel exhibited a 10.3-fold enhancement in cytotoxicity against cancer cells (IC50 of 2.8 µM) via apoptosis and cell cycle arrest.
  • Exceptional selectivity for cancer cells (selectivity index of 8.5) was observed, surpassing doxorubicin.

Conclusions:

  • A novel class of proton-activated artificial ion channels was successfully developed.
  • These channels show potential for targeted anticancer therapy by exploiting acidic tumor microenvironments.
  • The platform offers enhanced potency and selectivity compared to existing chemotherapeutics.