Effect of polysorbate 60 on interphase transport of cholesterol.

Journal of Pharmaceutical Sciences
P B McNulty

Abstract

Interphase cholesterol transport was investigated at 24 +/- 1 degrees in a stirred diffusion cell and in various oil-in-water emulsions. Cholesterol uptake by vegetable oil from a cholesterol-surfactant-rich aqueous phase was extremely slow in the stirred cell; no measurable transport had occurred after 500 hr. Cholesterol transport in oil-in-water emulsions following dilution with a cholesterol-surfactant-rich aqueous phase was much faster due to the greatly increased interfacial area available for mass transfer. Equilibration half-lives, t(50), varied from 2.02 to 28.1 hr. Variations in the t(50) were due to: (a) differences in the mean oil droplet diameter among various emulsions, and (b) differences in cholesterol-polysorbate 60 micelle sizes among various dilution media. When polysorbate 60 was omitted from the dilution medium, transport occurred in a two-stage process. In the first stage, transport was extremely rapid, with the t(50) less than 30 sec; in the second stage, transport was comparable to previous emulsion rates, with the t(50) varying from 7.9 to 8.1 hr. The significance of this two-stage transport to mechanisms of interphase cholesterol transport is briefly discussed.

References

Mar 15, 1972·Nature: New Biology·M P Short, C T Rhodes
Jan 1, 1965·Journal of Pharmaceutical Sciences·W I HIGUCHI, H Y SAAD

❮ Previous
Next ❯

Citations


❮ 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.