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ATP Energy Storage and Release

ATP Energy Storage and Release

ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...

ATP Energy Storage and Release

ATP Energy Storage and Release

ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...

Cardiopulmonary Resuscitation IV: Pharmacological Management

Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...

Principles of Drug Action

Principles of Drug Action

Drugs are chemical substances that modify biological responses by interacting with macromolecular targets such as receptors, ion channels, transporters, and enzymes. Pharmacodynamics describes the course of action of drugs leading to the physiological effect at a specific site in the body.
Drugs can be agonists or antagonists. Like the endogenous ligands, agonists always bind and activate the target to produce a cellular response. Agonist binding induces a conformational change which in turn...

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...

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Related Experiment Video

Updated: May 11, 2026

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

Published on: July 20, 2016

Adenosine: essential for life but licensed to kill.

Vivian Gama¹, Mohanish Deshmukh

¹Neuroscience Center, University of North Carolina, Chapel Hill, NC 27599, USA.

|May 14, 2013

Summary

A new cell death mechanism primes cells for apoptosis by detecting extracellular adenosine, a molecule that builds up after chemotherapy or hypoxia. This finding links adenosine signaling pathways directly to programmed cell death.

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

The tumor suppressor protein p53 plays a critical role in cellular responses to stress, including DNA damage and hypoxia.
Apoptosis, or programmed cell death, is a fundamental process for development and tissue homeostasis, and its dysregulation is implicated in cancer and other diseases.

Discussion:

Long and Crighton (2013) identify a novel cell death priming mechanism regulated by p53.
This mechanism is activated by the sensing of extracellular adenosine, which accumulates under conditions of chemotherapy or hypoxia.
The study establishes a new link between adenosine signaling and the induction of apoptosis.

Key Insights:

p53 acts as a sensor for extracellular adenosine.
Accumulation of extracellular adenosine serves as a signal for impending cell death.

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Last Updated: May 11, 2026

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

Published on: July 20, 2016

Use of a Hanging Weight System for Coronary Artery Occlusion in Mice

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Published on: April 19, 2011

Determining the Serum Stability of Human Adenosine Deaminase 1 Enzyme

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Published on: September 27, 2024

Adenosine signaling is integrated into the p53-mediated apoptotic pathway.

Outlook:

Further investigation into this pathway could reveal new therapeutic targets for cancer treatment.
Understanding adenosine's role in cell death may offer strategies to enhance chemotherapy efficacy or mitigate hypoxia-induced damage.
This discovery opens new avenues for exploring the interplay between metabolic stress, signaling molecules, and cell fate decisions.