Abstract
Background: Increases in both leukocyte and endothelial cytosolic free [Ca2+] may be involved in intercellular adhesion by regulating the affinity of surface adhesion molecules or by facilitating transendothelial leukocyte migration. The purpose of this study was to examine the effect of initial contact and subsequent adhesion of human neutrophils or monocytes on human aortic endothelial [Ca2+]. Methods and Results: Endothelial monolayers were loaded with the fluorescent Ca2+ indicator indo 1 and exposed to isolated human peripheral blood neutrophils or to a cultured human monocyte cell line. A rapid, fourfold to fivefold increase in endothelial cytosolic [Ca2+] occurred within seconds of leukocyte contact. No increase in endothelial [Ca2+] occurred on contact of 18.25-μm inert microspheres, isolated red blood cells, or suspensions of cultured human aortic endothelial cells. In experiments performed on monolayers grown in 1-mm2 capillary flow tubes, the increase in endothelial cytosolic [Ca2+] on initial leukocyte contact was found to be related to the subsequent resistance to leukocyte detachment during exposure to arterial levels of shear stress (13.4 dyne · cm-2). The increase in endothelial cytosolic [Ca2+] during leukocyte contact was not inhibited in Ca2+-free buffer but was abolished by prior depletion of an endoplasmic reticulum Ca2+ store by thapsigargin. Pretreatment of neutrophils with R15.7, a specific monoclonal antibody to the adhesion protein CD-18, inhibited the increase in endothelial cytosolic [Ca2+] on neutrophil contact. Conclusions: Initial contact leading to subsequent adhesion of human leukocytes to human aortic endothelial cells releases an endothelial intracellular Ca2+ store. This may, in part, be mediated by specific adhesion proteins and may in turn regulate the affinity of surface adhesion molecules or facilitate transendothelial migration of leukocytes.
| Original language | English |
|---|---|
| Pages (from-to) | 1899-1907 |
| Number of pages | 9 |
| Journal | Circulation |
| Volume | 90 |
| Issue number | 4 I |
| Publication status | Published - Oct 1994 |
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Keywords
- endothelium
- indo 1
- leukocytes
- shear stress
ASJC Scopus subject areas
- Physiology
- Cardiology and Cardiovascular Medicine
Cite this
Initial contact and subsequent adhesion of human neutrophils or monocytes to human aortic endothelial cells releases an endothelial intracellular calcium store. / Ziegelstein, Roy C.; Corda, Stefano; Pili, Roberto; Passaniti, Antonino; Lefer, David; Zweier, Jay L.; Fraticelli, Aureliano; Capogrossi, Maurizio C.
In: Circulation, Vol. 90, No. 4 I, 10.1994, p. 1899-1907.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Initial contact and subsequent adhesion of human neutrophils or monocytes to human aortic endothelial cells releases an endothelial intracellular calcium store
AU - Ziegelstein, Roy C.
AU - Corda, Stefano
AU - Pili, Roberto
AU - Passaniti, Antonino
AU - Lefer, David
AU - Zweier, Jay L.
AU - Fraticelli, Aureliano
AU - Capogrossi, Maurizio C.
PY - 1994/10
Y1 - 1994/10
N2 - Background: Increases in both leukocyte and endothelial cytosolic free [Ca2+] may be involved in intercellular adhesion by regulating the affinity of surface adhesion molecules or by facilitating transendothelial leukocyte migration. The purpose of this study was to examine the effect of initial contact and subsequent adhesion of human neutrophils or monocytes on human aortic endothelial [Ca2+]. Methods and Results: Endothelial monolayers were loaded with the fluorescent Ca2+ indicator indo 1 and exposed to isolated human peripheral blood neutrophils or to a cultured human monocyte cell line. A rapid, fourfold to fivefold increase in endothelial cytosolic [Ca2+] occurred within seconds of leukocyte contact. No increase in endothelial [Ca2+] occurred on contact of 18.25-μm inert microspheres, isolated red blood cells, or suspensions of cultured human aortic endothelial cells. In experiments performed on monolayers grown in 1-mm2 capillary flow tubes, the increase in endothelial cytosolic [Ca2+] on initial leukocyte contact was found to be related to the subsequent resistance to leukocyte detachment during exposure to arterial levels of shear stress (13.4 dyne · cm-2). The increase in endothelial cytosolic [Ca2+] during leukocyte contact was not inhibited in Ca2+-free buffer but was abolished by prior depletion of an endoplasmic reticulum Ca2+ store by thapsigargin. Pretreatment of neutrophils with R15.7, a specific monoclonal antibody to the adhesion protein CD-18, inhibited the increase in endothelial cytosolic [Ca2+] on neutrophil contact. Conclusions: Initial contact leading to subsequent adhesion of human leukocytes to human aortic endothelial cells releases an endothelial intracellular Ca2+ store. This may, in part, be mediated by specific adhesion proteins and may in turn regulate the affinity of surface adhesion molecules or facilitate transendothelial migration of leukocytes.
AB - Background: Increases in both leukocyte and endothelial cytosolic free [Ca2+] may be involved in intercellular adhesion by regulating the affinity of surface adhesion molecules or by facilitating transendothelial leukocyte migration. The purpose of this study was to examine the effect of initial contact and subsequent adhesion of human neutrophils or monocytes on human aortic endothelial [Ca2+]. Methods and Results: Endothelial monolayers were loaded with the fluorescent Ca2+ indicator indo 1 and exposed to isolated human peripheral blood neutrophils or to a cultured human monocyte cell line. A rapid, fourfold to fivefold increase in endothelial cytosolic [Ca2+] occurred within seconds of leukocyte contact. No increase in endothelial [Ca2+] occurred on contact of 18.25-μm inert microspheres, isolated red blood cells, or suspensions of cultured human aortic endothelial cells. In experiments performed on monolayers grown in 1-mm2 capillary flow tubes, the increase in endothelial cytosolic [Ca2+] on initial leukocyte contact was found to be related to the subsequent resistance to leukocyte detachment during exposure to arterial levels of shear stress (13.4 dyne · cm-2). The increase in endothelial cytosolic [Ca2+] during leukocyte contact was not inhibited in Ca2+-free buffer but was abolished by prior depletion of an endoplasmic reticulum Ca2+ store by thapsigargin. Pretreatment of neutrophils with R15.7, a specific monoclonal antibody to the adhesion protein CD-18, inhibited the increase in endothelial cytosolic [Ca2+] on neutrophil contact. Conclusions: Initial contact leading to subsequent adhesion of human leukocytes to human aortic endothelial cells releases an endothelial intracellular Ca2+ store. This may, in part, be mediated by specific adhesion proteins and may in turn regulate the affinity of surface adhesion molecules or facilitate transendothelial migration of leukocytes.
KW - endothelium
KW - indo 1
KW - leukocytes
KW - shear stress
UR - http://www.scopus.com/inward/record.url?scp=0028153340&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028153340&partnerID=8YFLogxK
M3 - Article
C2 - 7923678
AN - SCOPUS:0028153340
VL - 90
SP - 1899
EP - 1907
JO - Circulation
JF - Circulation
SN - 0009-7322
IS - 4 I
ER -