Involvement of myosin light-chain kinase in endothelial cell retraction

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Proceedings of the National Academy of Sciences of the United States of America; (USA)

DOI:https://doi.org/10.1073/pnas.87.1.16· OSTI ID:6968819

Wysolmerski, R B; Lagunoff, D ^[1]

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1. Saint Louis Univ. School of Medicine, MO (USA)

Permeabilized bovine pulmonary artery endothelial cell monolayers were used to investigate the mechanism of endothelial cell retraction. Postconfluent endothelial cells permeabilized with saponin retracted upon exposure to ATP and Ca{sup 2+}. Retraction was accompanied by thiophosphorylation of 19,000-Da myosin light chains when adenosine 5'-(gamma-({sup 35}S)thio)triphosphate was included in the medium. Both retraction and thiophosphorylation of myosin light chains exhibited a graded quantitative dependence on Ca{sup 2+}. When permeabilized monolayers were extracted in buffer D containing 100 mM KCl and 30 mM MgCl2 for 30 min, the cells failed to retract upon exposure to ATP and Ca{sup 2+}, and no thiophosphorylation of myosin light chains occurred. The ability both to retract and to thiophosphorylate myosin light chains was restored by the addition to the permeabilized, extracted cells of myosin light-chain kinase and calmodulin together but not by either alone. These studies indicate that endothelial cell retraction, as does smooth muscle contraction, depends on myosin light-chain kinase phosphorylation of myosin light chains.

• OSTI ID: 6968819
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (USA), Vol. 87:1; ISSN 0027-8424
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
CELL MEMBRANES
PERMEABILITY
MYOSIN
PHOSPHORYLATION
PHOSPHOTRANSFERASES
ENZYME ACTIVITY
ATP
CALCIUM COMPOUNDS
CATTLE
ELECTROPHORESIS
ENDOTHELIUM
FLUORESCENCE
MOLECULAR WEIGHT
SULFUR 35
TRACER TECHNIQUES
ALKALINE EARTH METAL COMPOUNDS
ANIMAL TISSUES
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
CELL CONSTITUENTS
CHEMICAL REACTIONS
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
ENZYMES
EVEN-ODD NUCLEI
GLOBULINS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LUMINESCENCE
MAMMALS
MEMBRANES
NUCLEI
NUCLEOTIDES
ORGANIC COMPOUNDS
PHOSPHORUS-GROUP TRANSFERASES
PROTEINS
RADIOISOTOPES
RUMINANTS
SULFUR ISOTOPES
TISSUES
TRANSFERASES
VERTEBRATES
550201* - Biochemistry- Tracer Techniques