Microvascular hyperpermeability in caveolin-1 (-/-) knock-out mice. Treatment with a specific nitric-oxide synthase inhibitor, L-name, restores normal microvascular permeability in Cav-1 null mice

William Schubert, Philippe G. Frank, Scott E. Woodman, Hideyuki Hyogo, David E. Cohen, Chi Wing Chow, Michael P. Lisanti

Research output: Contribution to journalArticle

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Abstract

Microvascular permeability is mediated by (i) the caveolar transcytosis of molecules across endothelial cells and (ii) the paracellular movement of ions and nutrients. Recently, we derived Cav-1 (-/-) knock-out mice using standard homologous recombination techniques. These mice are viable but show a loss of endothelial cell caveolae and striking defects in caveolae-mediated endocytosis. Thus, a compensatory mechanism must be operating in these mice. One possible compensatory response would be an increase in the paracellular pathway, resulting in increased microvascular permeability. To test this hypothesis directly, we studied the microvascular permeability of Cav-1 null mice using a variety of complementary in vivo approaches. Radio-iodinated bovine serum albumin was injected into Cav-1-deficient mice, and its rate of clearance from the circulatory system was compared with that of wild type control mice. Our results indicate that iodinated bovine serum albumin is removed from the circulatory system of Cav-1-deficient mice at a substantially faster rate. To determine whether this defect is restricted to the paracellular movement of albumin, lungs from Cav-1-deficient mice were next perfused with the electron dense dye Ruthenium Red. Micrographs of lung endothelial cells from Cav-1-deficient mice demonstrate that the paracellular movement of Ruthenium Red is dramatically increased. In addition, electron micrographs of Cav-1-deficient lung capillaries reveal defects in tight junction morphology and abnormalities in capillary endothelial cell adhesion to the basement membrane. This defect in cell-substrate attachment is consistent with the postulated role of caveolin-1 in positively regulating integrin signaling. Because loss of caveolin-1 expression results in constitutive activation of eNOS activity, we also examined whether these increases in microvascular permeability are NO-dependent. Interestingly, treatment with L-NAME (a well established nitric-oxide synthase inhibitor) successfully reversed the microvascular hyperpermeability phenotype of Cav-1 knock-out mice. Thus, caveolin-1 plays a dual regulatory role in controlling microvascular permeability: (i) as a structural protein that is required for caveolae formation and caveolar transcytosis and (ii) as a tonic inhibitor of eNOS activity to negatively regulate the paracellular pathway.

Original languageEnglish (US)
Pages (from-to)40091-40098
Number of pages8
JournalJournal of Biological Chemistry
Volume277
Issue number42
DOIs
StatePublished - Oct 18 2002

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Caveolin 1
Endothelial cells
Capillary Permeability
Knockout Mice
Nitric Oxide Synthase
Names
Ruthenium Red
Defects
Bovine Serum Albumin
Caveolae
Endothelial Cells
Transcytosis
Electrons
NG-Nitroarginine Methyl Ester
Cell adhesion
Cardiovascular System
Integrins
Lung
Nutrients
Albumins

ASJC Scopus subject areas

  • Biochemistry

Cite this

Microvascular hyperpermeability in caveolin-1 (-/-) knock-out mice. Treatment with a specific nitric-oxide synthase inhibitor, L-name, restores normal microvascular permeability in Cav-1 null mice. / Schubert, William; Frank, Philippe G.; Woodman, Scott E.; Hyogo, Hideyuki; Cohen, David E.; Chow, Chi Wing; Lisanti, Michael P.

In: Journal of Biological Chemistry, Vol. 277, No. 42, 18.10.2002, p. 40091-40098.

Research output: Contribution to journalArticle

Schubert, William ; Frank, Philippe G. ; Woodman, Scott E. ; Hyogo, Hideyuki ; Cohen, David E. ; Chow, Chi Wing ; Lisanti, Michael P. / Microvascular hyperpermeability in caveolin-1 (-/-) knock-out mice. Treatment with a specific nitric-oxide synthase inhibitor, L-name, restores normal microvascular permeability in Cav-1 null mice. In: Journal of Biological Chemistry. 2002 ; Vol. 277, No. 42. pp. 40091-40098.
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