C-Reactive Protein Augments Interleukin-8 Secretion in Human Peripheral Blood Monocytes

2005 ◽  
Vol 46 (5) ◽  
pp. 690-696 ◽  
Author(s):  
Liangqi Xie ◽  
Lina Chang ◽  
Youfei Guan ◽  
Xian Wang
1995 ◽  
Vol 8 (2) ◽  
pp. 95-102
Author(s):  
J. Cofta ◽  
J.K. Lacki ◽  
S.H. Mackiewicz ◽  
K.E. Wiktorowicz

The effect of C-reactive protein (CRP) on the oxidative response of human peripheral blood monocytes and granulocytes was investigated. The respiratory burst of phagocytes induced by phorbol-myristate-13-acetate (PMA), phytohaemagglutinin (PHA) or opsonized zymosan (OZ) was measured in luminol-enhanced chemiluminescence. The effect of CRP on PMA-induced monocyte chemiluminescence (CL) depended both on CRP concentration and incubation time. A short incubation of cells with CRP (15–30 min.) enhanced the oxidative burst. Preincubation of cells for 1h (or longer) with low doses of CRP (about 2 μg/ml) increased, while with higher (>10 μg/ml) inhibited PMA-stimulated chemiluminescence. CRP reduced also PHA or OZ-induced monocyte respiratory response. CRP diminished PMA, PHA, and OZ-induced granulocyte chemiluminescence, except the response to PHA in the presence of low doses CRP (about 5 μg/ml). The action of CRP on phagocytes probably involves activation of some intracellular mechanisms. During immune response, CRP could protect tissues against damage by excess of free oxygen and its biological active derivatives.


Blood ◽  
1993 ◽  
Vol 82 (2) ◽  
pp. 513-520 ◽  
Author(s):  
J Cermak ◽  
NS Key ◽  
RR Bach ◽  
J Balla ◽  
HS Jacob ◽  
...  

The acute inflammatory response is frequently accompanied by serious thrombotic events. We show that C-reactive protein (CRP), an acute- phase reactant that markedly increases its serum concentration in response to inflammatory stimuli, induced monocytes to express tissue factor (TF), a potent procoagulant. Purified human CRP in concentrations commonly achieved in vivo during inflammation (10 to 100 micrograms/mL) induced a 75-fold increase in TF procoagulant activity (PCA) of human peripheral blood mononuclear cells (PBM), with a parallel increase in TF antigen levels. CRP-induced PCA was completely blocked by a monoclonal antibody against human TF but not by irrelevant murine IgG. Dot blot analysis showed a significant increase of TF mRNA after 4 hours of incubation with CRP, followed by a peak of PCA within 6 and 8 hours. Actinomycin D and cycloheximide blocked CRP-stimulated PCA, suggesting that de novo TF protein synthesis was required. Endotoxin (LPS) contamination of CRP was excluded as the mediator of TF synthesis because: (1) CRP was Limulus assay negative; (2) induction of TF PCA by CRP was not blocked by Polymyxin B, in contrast to LPS- induced PCA; (3) antihuman CRP IgG inhibited CRP-induced PCA, but not LPS-induced PCA; (4) CRP was able to stimulate TF production in LPS- pretreated PBM refractory to additional LPS stimulation; and, (5) unlike LPS, CRP was incapable of inducing TF in human umbilical vein endothelial cells. We suggest that CRP-mediated TF production in monocytes may contribute to the development of disseminated intravascular coagulation and thrombosis in inflammatory states.


2020 ◽  
pp. 32-37
Author(s):  
О.А. Гусева ◽  
И.С. Мельников ◽  
Е.С. Зубкова ◽  
С.Г. Козлов ◽  
Ю.Н. Автаева ◽  
...  

Данные крупных проспективных исследований демонстрируют корреляционную связь уровня С-реактивного белка (СРБ) в крови и риска развития неблагоприятных сердечно-сосудистых событий. Однако остаются малоизученными уровень экспрессии СРБ клетками пери- ферической крови и их способность синтезировать СРБ. Цель исследования. Определение уровней экспрессии СРБ циркулирующими клетками периферической крови. Исследование экспрессии мРНК СРБ макрофагами, полученными из моноцитов периферической крови. Материал и методы. Исследовали эритроциты, тромбоциты и лейкоциты периферической крови 6 добровольцев в возрасте от 30 до 60 лет. Для идентификации фенотипа клеток крови применяли метод проточной цитофлюориметрии с использованием панели моноклональных ан- тител, конъюгированных с различными флюорохромами, а именно CD235a-PE-Cy7, CD41-APC, CD45-PerCP-Cy5.5 и CD14-APC-Cy-7. Уровень экспрессии клетками крови СРБ определяли по уровню флюоресценции связанных с целевыми клетками FITC-конъюгированных моноклональ- ных антител к СРБ («ИМТЕК», Россия). Для определения мРНК СРБ применяли метод количественной полимеразной цепной реакции (ПЦР) с последующим анализом специфичности амплификаций с помощью электрофореза в агарозном геле. Об экспрессии СРБ макрофагами, полученными из моноцитов периферической крови, судили по количеству мРНК, выделенной после их активации липополисахаридом (ЛПС). Результаты. Результаты исследования показали, что СРБ экспрессируют 85,0±10,5% моноцитов; лимфоциты, тромбоциты и эритроци- ты — 7,5±0,6, 3,0±0,3 и 4,3±0,5% соответственно. Методом количественной ПЦР в небольших количествах мРНК СРБ была зарегистри- рована в макрофагах, активированных ЛПС. Ее уровень незначительно, в 0,79±0,73 раза (p=0,96, n=6), отличался относительно гена «домашнего хозяйства». Заключение. Обнаружено, что СРБ присутствует на внешней клеточной мембране до 90% циркулирующих моноцитов и до 10% лимфо- цитов, в то время как эритроциты и тромбоциты не несут на своей поверхности СРБ. Установлена возможность синтеза СРБ стимулиро- ванными ЛПС макрофагами, полученными из моноцитов периферической крови. Data from major prospective studies demonstrate a correlation between blood C-reactive protein (CRP) levels and the risk of adverse cardiovascular events. However, the level of expression of CRP by peripheral blood cells and their ability to synthesize CRP remains poorly studied. The purpose of the study. Determination of CRP expression levels by circulating peripheral blood cells. Investigation of expression of CRP mRNA by macrophages obtained from peripheral blood monocytes. Material and methods. erythrocytes, platelets and leukocytes of peripheral blood were studied in 6 volunteers aged 30 to 60 years. To identify the blood cell phenotype, the method of flow cytofluorimetry was used using a panel of monoclonal antibodies conjugated with different fluorophores, namely, CD235a-PE-Cy7, CD41-APC, CD45-PerCP-Cy5.5 and CD14-APC-Cy-7. Blood cell expression level of CRP was determined by fluorescence level of FITC-conjugated monoclonal antibodies to CRP associated with target cells (IMTEK, Russia). The method of quantitative polymerase chain reaction (PCR) with the subsequent analysis of specificity of amplifications by electrophoresis in agarose gel was used for determination of mRNA of CRP. The expression of DRR by macrophages derived from peripheral blood monocytes was judged by the amount of mRNA isolated after their activation by lipopolysaccharide (LPS). The results. The results of the study showed that CRP express 85.0±10.5% monocytes, lymphocytes, platelets and red blood cells — 7.5±0.6, 3.0±0.3 and 4.3±0.5% respectively. The method of quantitative PCR in small amounts of CRP mRNA was registered in macrophages activated by LPS. Its level was insignificant, by 0.79±0.73 times (p=0.96, n=6), differed from the "household" gene. Conclusion. It was found that CRP is present on the outer cell membrane up to 90% of circulating monocytes and up to 10% of lymphocytes, while red blood cells and platelets do not carry CRP on their surface. The possibility of synthesis of CRP by stimulated LPS macrophages obtained from peripheral blood monocytes has been established


Blood ◽  
1993 ◽  
Vol 82 (2) ◽  
pp. 513-520 ◽  
Author(s):  
J Cermak ◽  
NS Key ◽  
RR Bach ◽  
J Balla ◽  
HS Jacob ◽  
...  

Abstract The acute inflammatory response is frequently accompanied by serious thrombotic events. We show that C-reactive protein (CRP), an acute- phase reactant that markedly increases its serum concentration in response to inflammatory stimuli, induced monocytes to express tissue factor (TF), a potent procoagulant. Purified human CRP in concentrations commonly achieved in vivo during inflammation (10 to 100 micrograms/mL) induced a 75-fold increase in TF procoagulant activity (PCA) of human peripheral blood mononuclear cells (PBM), with a parallel increase in TF antigen levels. CRP-induced PCA was completely blocked by a monoclonal antibody against human TF but not by irrelevant murine IgG. Dot blot analysis showed a significant increase of TF mRNA after 4 hours of incubation with CRP, followed by a peak of PCA within 6 and 8 hours. Actinomycin D and cycloheximide blocked CRP-stimulated PCA, suggesting that de novo TF protein synthesis was required. Endotoxin (LPS) contamination of CRP was excluded as the mediator of TF synthesis because: (1) CRP was Limulus assay negative; (2) induction of TF PCA by CRP was not blocked by Polymyxin B, in contrast to LPS- induced PCA; (3) antihuman CRP IgG inhibited CRP-induced PCA, but not LPS-induced PCA; (4) CRP was able to stimulate TF production in LPS- pretreated PBM refractory to additional LPS stimulation; and, (5) unlike LPS, CRP was incapable of inducing TF in human umbilical vein endothelial cells. We suggest that CRP-mediated TF production in monocytes may contribute to the development of disseminated intravascular coagulation and thrombosis in inflammatory states.


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