Abstract
Background: Endothelial microparticles (EMPs) are <2-μm membranous blebs from endothelial cell membranes that have been demonstrated to be elevated in vasculopathic conditions. One study has demonstrated elevated EMPs in acute ischemic stroke (AIS) versus age- and comorbidity-matched controls. Objectives: To determine the level of EMPs in stroke mimics and AIS and determine if EMPs are released as a result of activation or apoptosis/necrosis in AIS. Methods: EMP levels in plasma of patients with AIS and stroke mimic patients were quantified by flow cytometry. Stroke status was verified in all patients by magnetic resonance imaging. Patients were matched for age and comorbidities. Markers for apoptosis/necrosis (platelet/endothelial cell adhesion molecule-1 [PECAM-1]/CD31 antigen) and activation (E-selectin/CD62e antigen) were compared. A PECAM-1/E-selectin ratio of >4.0 was used to determine whether EMPs were generated via activation or apoptosis/necrosis. Data were compared between groups using the Mann-Whitney U test. Results: EMP levels were similar in stroke mimic patients when compared with AIS; there was no difference between groups (PECAM-1, p = 0.393; E-selectin, p = 0.579). The PECAM-1/E-selectin ratio was also similar for AIS and stroke mimics, and all were >4.0. Conclusions: EMP levels were similar in patients with AIS and stroke mimic patients. The PECAM-1/E-selectin ratio demonstrated that EMPs were generated via activation and not apoptosis/necrosis. This suggests that EMPs may not be a good marker for AIS, given the inability to discriminate between stroke mimics and AIS.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 685-690 |
| Number of pages | 6 |
| Journal | Academic Emergency Medicine |
| Volume | 14 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2007 |
| Externally published | Yes |
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Keywords
- CD31 antigen
- CD42b antigen
- CD62e antigen
- E-selectin
- endothelial cells
- ischemic stroke
- PECAM-1
ASJC Scopus subject areas
- Emergency Medicine
Cite this
Endothelial Microparticle Levels Are Similar in Acute Ischemic Stroke and Stroke Mimics Due to Activation and Not Apoptosis/Necrosis. / Williams, Justin B.; Jauch, Edward C.; Lindsell, Christopher J.; Campos, Begoña.
In: Academic Emergency Medicine, Vol. 14, No. 8, 08.2007, p. 685-690.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Endothelial Microparticle Levels Are Similar in Acute Ischemic Stroke and Stroke Mimics Due to Activation and Not Apoptosis/Necrosis
AU - Williams, Justin B.
AU - Jauch, Edward C.
AU - Lindsell, Christopher J.
AU - Campos, Begoña
PY - 2007/8
Y1 - 2007/8
N2 - Background: Endothelial microparticles (EMPs) are <2-μm membranous blebs from endothelial cell membranes that have been demonstrated to be elevated in vasculopathic conditions. One study has demonstrated elevated EMPs in acute ischemic stroke (AIS) versus age- and comorbidity-matched controls. Objectives: To determine the level of EMPs in stroke mimics and AIS and determine if EMPs are released as a result of activation or apoptosis/necrosis in AIS. Methods: EMP levels in plasma of patients with AIS and stroke mimic patients were quantified by flow cytometry. Stroke status was verified in all patients by magnetic resonance imaging. Patients were matched for age and comorbidities. Markers for apoptosis/necrosis (platelet/endothelial cell adhesion molecule-1 [PECAM-1]/CD31 antigen) and activation (E-selectin/CD62e antigen) were compared. A PECAM-1/E-selectin ratio of >4.0 was used to determine whether EMPs were generated via activation or apoptosis/necrosis. Data were compared between groups using the Mann-Whitney U test. Results: EMP levels were similar in stroke mimic patients when compared with AIS; there was no difference between groups (PECAM-1, p = 0.393; E-selectin, p = 0.579). The PECAM-1/E-selectin ratio was also similar for AIS and stroke mimics, and all were >4.0. Conclusions: EMP levels were similar in patients with AIS and stroke mimic patients. The PECAM-1/E-selectin ratio demonstrated that EMPs were generated via activation and not apoptosis/necrosis. This suggests that EMPs may not be a good marker for AIS, given the inability to discriminate between stroke mimics and AIS.
AB - Background: Endothelial microparticles (EMPs) are <2-μm membranous blebs from endothelial cell membranes that have been demonstrated to be elevated in vasculopathic conditions. One study has demonstrated elevated EMPs in acute ischemic stroke (AIS) versus age- and comorbidity-matched controls. Objectives: To determine the level of EMPs in stroke mimics and AIS and determine if EMPs are released as a result of activation or apoptosis/necrosis in AIS. Methods: EMP levels in plasma of patients with AIS and stroke mimic patients were quantified by flow cytometry. Stroke status was verified in all patients by magnetic resonance imaging. Patients were matched for age and comorbidities. Markers for apoptosis/necrosis (platelet/endothelial cell adhesion molecule-1 [PECAM-1]/CD31 antigen) and activation (E-selectin/CD62e antigen) were compared. A PECAM-1/E-selectin ratio of >4.0 was used to determine whether EMPs were generated via activation or apoptosis/necrosis. Data were compared between groups using the Mann-Whitney U test. Results: EMP levels were similar in stroke mimic patients when compared with AIS; there was no difference between groups (PECAM-1, p = 0.393; E-selectin, p = 0.579). The PECAM-1/E-selectin ratio was also similar for AIS and stroke mimics, and all were >4.0. Conclusions: EMP levels were similar in patients with AIS and stroke mimic patients. The PECAM-1/E-selectin ratio demonstrated that EMPs were generated via activation and not apoptosis/necrosis. This suggests that EMPs may not be a good marker for AIS, given the inability to discriminate between stroke mimics and AIS.
KW - CD31 antigen
KW - CD42b antigen
KW - CD62e antigen
KW - E-selectin
KW - endothelial cells
KW - ischemic stroke
KW - PECAM-1
UR - http://www.scopus.com/inward/record.url?scp=34447327229&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34447327229&partnerID=8YFLogxK
U2 - 10.1197/j.aem.2007.04.009
DO - 10.1197/j.aem.2007.04.009
M3 - Article
C2 - 17606807
AN - SCOPUS:34447327229
VL - 14
SP - 685
EP - 690
JO - Academic Emergency Medicine
JF - Academic Emergency Medicine
SN - 1069-6563
IS - 8
ER -