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Related Concept Videos

Hypoxia01:23

Hypoxia

1.8K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Adrenergic Agonists: Direct-Acting Agents01:30

Adrenergic Agonists: Direct-Acting Agents

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Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
These agents can be classified...
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
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Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists01:18

Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists

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Endothelins (ETs) are potent vasoactive peptides critical in the human body's various physiological and pathological processes. One of the most promising therapeutic strategies for treating pulmonary arterial hypertension (PAH) involves counteracting the effects of these endothelins using a class of drugs known as endothelin receptor antagonists.
ETs are synthesized through a complex sequence of enzymatic steps, primarily involving an enzyme referred to as endothelin-converting enzyme...
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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

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Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue,...
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Related Experiment Video

Updated: Dec 26, 2025

A Hydrogen-Deuterium Exchange Mass Spectrometry HDX-MS Platform for Investigating Peptide Biosynthetic Enzymes
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A Hydrogen-Deuterium Exchange Mass Spectrometry HDX-MS Platform for Investigating Peptide Biosynthetic Enzymes

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Boholamide A, an APD-Class, Hypoxia-Selective Cyclodepsipeptide.

Joshua P Torres1, Zhenjian Lin1, David S Fenton1

  • 1Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.

Journal of Natural Products
|March 19, 2020
PubMed
Summary
This summary is machine-generated.

Researchers discovered boholamide A, a novel peptide that selectively targets cancer cells by controlling calcium influx. This finding offers a new scaffold for developing hypoxia-selective anticancer drugs.

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Tracking Hypoxic Signaling within Encapsulated Cell Aggregates
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Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
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Area of Science:

  • Biochemistry
  • Pharmacology
  • Oncology

Background:

  • Calcium homeostasis plays a role in cancer development.
  • Targeting calcium pathways presents a potential strategy for novel cancer therapeutics.

Purpose of the Study:

  • To identify novel compounds with anticancer activity by screening bacterial extracts.
  • To investigate the mechanism of action and selectivity of identified compounds.

Main Methods:

  • Assay development using a glioblastoma cell line.
  • Screening of 1000 unique bacterial extracts.
  • Isolation and identification of the active compound, boholamide A.
  • Assessment of calcium ion (Ca2+) influx in glioblastoma and neuronal cells.
  • Evaluation of hypoxia selectivity and mitochondrial targeting.

Main Results:

  • Boholamide A (1), a 4-amido-2,4-pentadieneoate (APD)-class peptide, was identified.
  • Boholamide A induces rapid Ca2+ influx in glioblastoma and neuronal cells at nanomolar concentrations.
  • Boholamide A exhibits hypoxia selectivity, consistent with other APD-class compounds.
  • The compound primarily targets mitochondria.

Conclusions:

  • Boholamide A represents a novel APD scaffold with potential for anticancer drug development.
  • Its hypoxia-selective cytotoxicity and calcium-modulating properties make it a promising candidate for glioblastoma and other cancers.
  • Further research into APD-class compounds could yield new chemotherapeutic agents.