Plasma Concentration of SCUBE1, a Novel Platelet Protein, Is Elevated in Patients With Acute Coronary Syndrome and Ischemic Stroke
Dao-Fu Dai, MD*, ,
Peterus Thajeb, MD , ,
Cheng-Fen Tu, MS¶,
Fu-Tien Chiang, MD, PhD*,
Chien-Hsiun Chen, PhD¶,
Ruey-Bing Yang, PhD||,¶,* and
Jin-Jer Chen, MD*,¶,*
* Section of Cardiology, Department of Internal Medicine, National Taiwan University Hospital and College of Medicine, National Taiwan University, Taipei, Taiwan
Section of Cardiology, Department of Internal Medicine, Taoyuan General Hospital Department of Health Executive Yuan, Taipei, Taiwan
Department of Neurology and Medical Research, Mackay Memorial Hospital and Taipei Medical University, Taipei, Taiwan
Department of Biomedical Sciences, John A. Burns School of Medicine, University of Hawaii at Manoa, Manoa, Hawaii
|| Institute of Pharmacology, School of Medicine, National Yang-Ming University, Taipei, Taiwan
¶ Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
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Figure 1 Plasma SCUBE1 and sCD40L Concentration in CAD, ACS, and Acute Stroke Patients
Plasma concentration of signal peptide–complement proteins C1r/C1s, Uegf, and Bmp1–epidermal growth factor-like domain containing protein 1 (SCUBE1) and sCD40L in cases (coronary artery disease [CAD], acute coronary syndromes [ACS], acute ischemic stroke) versus healthy control subjects (A), and in subgroup analyses (B). For SCUBE1, p < 0.01 after Bonferroni correction in ACS versus control subjects and acute ischemic stroke versus control subjects. For sCD40L, *p = 0.02, **p < 0.01 after Bonferroni correction. LAT = large-vessel atherothrombotic; NSTEMI = non–ST-segment elevation myocardial infarction; SL = small lacunar stroke; STEMI = ST-segment elevation myocardial infarction; TIA = transient ischemic attack; UA = unstable angina; VD = vessel-disease.
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Figure 2 Plasma SCUBE1 Concentration in Patients With ACS and Acute LAT Stroke Versus Time After Onset
(A) Scatterplot of plasma SCUBE1 concentration. One point represents 1 subject. Plasma SCUBE1 was detected as early as 6 h after the onset of symptoms, but no later than 84 h, in both ACS and LAT. (B) Serial measurement of plasma SCUBE1 concentration in 6 patients with acute STEMI treated with primary percutaneous coronary intervention. Peak values occur at 36 to 60 h after onset, and degraded not later than 96 h. Abbreviations as in Figure 2.
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Figure 3 Plasma SCUBE1 as Proteolytic Fragments
(A) Two-dimensional electrophoresis and Western blot of a representative plasma sample of acute coronary syndromes patients probed with antisignal peptide–complement proteins C1r/C1s, Uegf, and Bmp1–epidermal growth factor-like domain containing protein 1 (SCUBE1) antibody. Two spots (arrowheads) represent the proteolytic fragments (MW = 95 kDa, pI = 5 and MW = 80 kDa, pI = 6.5, respectively), different from the full-length SCUBE1 protein (MW = 135 kDa, pI = 6.7, arrow). These 2 fragments have been seen in multiple acute coronary syndromes plasma samples. (B) The secreted SCUBE1 protein is cleaved in the presence of fetal bovine serum (FBS). The recombinant Flag.SCUBE1 protein was produced in HEK-293T cells in the presence or absence of FBS. Immunoprecipitation of Flag.SCUBE1 was followed by Western blotting using anti-FLAG antibody. (C) Proteolytic cleavage within the spacer region of the secreted SCUBE1. Recombinant Flag.SCUBE1 full-length (FL), deletion mutants (D1 and D2) protein was compared with the cleaved SCUBE1 fragment. The positions of FL protein (arrow) or its cleaved fragments (arrowhead) are indicated. (D) Domains of the SCUBE1 full-length and deletion mutants. Arrow shows a putative protease cleavage site (RXXR) within the spacer region. "Y" indicates potential N-linked glycosylation site. CUB = complement proteins C1r/C1s, Uegf, and Bmp1 domain; E = EGF-like repeats; SP = signal peptide.
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