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The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
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Acid activation of omeprazole in isolated gastric vesicles, oxyntic cells, and gastric glands.

M Morii¹, H Takata, N Takeguchi

¹Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Japan.

Gastroenterology

|June 1, 1989

Summary

This summary is machine-generated.

Omeprazole transforms into a fluorescent molecule in acidic conditions, indicating its activation. This fluorescence decreases with the addition of sulfhydryl groups or increased pH, revealing omeprazole

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Area of Science:

Biochemistry
Pharmacology
Cell Biology

Background:

Omeprazole is a proton pump inhibitor that targets gastric hydrogen ion transporting, potassium-stimulated adenosine triphosphatase.
Understanding omeprazole's activation mechanism is crucial for its therapeutic application and drug development.

Purpose of the Study:

To investigate the transformation of omeprazole into a fluorescent molecule in acidic environments.
To identify the chemical nature and activation sites of this fluorescent omeprazole derivative.
To elucidate the interaction of omeprazole with sulfhydryl groups within the gastric proton pump.

Main Methods:

Utilizing fluorescence spectroscopy to detect and quantify omeprazole transformation.
Employing hog gastric vesicles and isolated rabbit gastric glands to study omeprazole activation in a biological context.
Using fluorescence imaging to visualize omeprazole activation in isolated Xenopus oxyntic cells.

Main Results:

Omeprazole transforms into a strong fluorescent molecule (excitation/emission 370/560 nm) in acidic media, identified as an acid-activated planar cyclic sulfenamide derivative.
Fluorescence intensity increased upon omeprazole addition to gastric vesicles, indicating intravesicular activation, followed by a biphasic decrease.
The decrease in fluorescence correlated with the reaction of the activated omeprazole with sulfhydryl groups on the gastric proton pump and was reduced by increased pH or sulfhydryl compounds.

Conclusions:

Omeprazole activation is pH-dependent and occurs in acidic compartments, such as the intravesicular space of gastric vesicles and the lumina of gastric glands.
The activated omeprazole derivative reacts with sulfhydryl groups of the gastric proton pump, providing insights into its mechanism of action.
Fluorescence-based methods can effectively monitor omeprazole activation and its interaction with biological targets in real-time.