Tritiated thymidine incorporation into DNA in rat gastric mucosal cells

Digestion
B WallmarkH F Helander

Abstract

The parietal cell acid pump inhibitor, omeprazole, has undergone numerous genotoxicity studies, the conclusions of which have all been negative. A recent report by Burlinson described a method which is claimed to measure unscheduled DNA synthesis (UDS) in gastric mucosa, based on the incorporation of tritiated thymidine (3H-TdR) into DNA. In a subsequent letter it was concluded that omeprazole induces a significant increase in UDS, and it was suggested that 'for omeprazole, a genotoxic action cannot be discounted'. The Burlinson method of measuring UDS relies upon selective separation of non-dividing oxyntic mucosal surface cells from the stem cells located in the proliferative zone. These stem cells undergo normal cell division, subsequently migrate to the top and bottom of the gland, differentiating into the various specialized cells of the gland such as surface, parietal and chief cells. In the oxyntic mucosa the majority of stem cells are located at a level corresponding to one fifth of the mucosal thickness from the surface. The purpose of this study was to evaluate the Burlinson method, which depends upon the selective isolation of non-dividing surface cells by pronase digestion. The fraction used for measurement was inve...Continue Reading

Citations

Mar 1, 1995·Pharmacology & Therapeutics·R E PowersI M Modlin

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.