Mononükleer lökositlerin trombosit fonksiyonları ve hemostaz üzerine etkilerinin incelenmesi
Date
2024-07-19
Authors
Journal Title
Journal ISSN
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Publisher
Bursa Uludağ Üniversitesi
Abstract
Hemostaz, dokuda meydana gelen hasarı onarma sürecinde meydana gelen ilk tepki olmakla beraber öncelikle trombositlerin, ardından diğer hücre gruplarının etkileşimiyle ve çeşitli moleküllerin aracılığıyla ilerleyen kompleks bir olaydır. Bu süreçte trombositler, birçok görev üstlenir. Trombositlerin, dolaşımdan zedelenen doku alanına adezyonu, granül içeriklerinin salınımı, agregasyonu, fibrin ağının ve hemostatik tıkacın oluşumu, yara iyileşmesi ve immün hücrelerin zedelenen dokuyagöçünü sağlamak gibi önemli görevleri vardır. Trombositler hemostaz sürecinde mononükleer hücreler ile heterotipik etkileşimler kurmaktadır. Çalışmamızda mononükleer hücrelerin hemostaz sürecine etkisini değerlendirmek amacıyla, tüm hemostaz sisteminin gözlemlendiği tromboelastogram ve trombosit agregasyonunun hücre düzeyinde izlendiği optikagregometre cihazları kullanılmıştır. Mononükleer hücrelerin kandan ayrıştırıldıktan hemen sonra (0. saat) ve LPS ile uyarılmadan ve uyarılarak bekletildiği 22 saat sonrası değerlendirmeler yapılmıştır. Trombositten zengin plazma (TZP) üzerine eklenen mononükleer hücre gruplarının ADP ve kolajen ile uyarılan trombosit agregasyonunaetkisi ve kalsiyum eklenerek normal koagülan durumun yeniden sağlandığı tromboelastogram parametrelerine etkisi araştırılmıştır. Tromboelastogram deneyleri, LPS ile uyarılarak ve uyarılmadan, 22 saat inkübe edilen mononükleer hücre gruplarının hiperkoagülan etki gösterdiğini ortaya koymuştur. Trombosit agregasyonunun hücre düzeyinde değerlendirildiği optik agregometrede, LPS ile uyarılarak ve uyarılmadan, 22 saat inkübe edilen mononükleer hücre gruplarının agregasyonu inhibe ettiği gözlemlenmiştir. Agregometrede trombositlerin inhibe olması, tromboelastogramda ise hemostazınaktive olması birbirine tezat sonuçlar olarak görünmektedir. Bu etkinin agregasyon çalışmalarındaki antikoagülan ortamdan kaynaklanabileceği, tromboelastogramda iseortama kalsiyum eklenmesinin normal fizyolojik koşulları daha iyi yansıttığı düşünülebilir.
Although hemostasis is the first response in the process of repairing damage to the tissue, it is a complex event that progresses primarily through the interaction ofplatelets, then other cell groups, and through various molecules. In this process,platelets undertake many tasks. Platelets have important functions such as adhesionfrom the circulation to the injured tissue area, release of granule contents, aggregation,formation of the fibrin network and hemostatic plug, wound healing and migration ofimmune cells to the injured tissue. Platelets establish heterotypic interactions with mononuclear cells during thehemostasis process. In our study, in order to evaluate the effect of mono nuclear cellson the hemostasis process, thromboelastogram, in which the entire hemostasis systemis observed, and optical aggregometer devices, in which platelet aggregation ismonitored at the cell level, were used. Mononuclear cells were evaluated immediatelyafter they were separated from the blood (hour 0) and 22 hours after they were keptunstimulated and stimulated with LPS. The effect of mononuclear cell groups addedto platelet-rich plasma (PRP) on ADP and collagen-stimulated platelet aggregation andthe effect of calcium addition on thromboelastogram parameters, where the normalcoagulant state is restored, was investigated.Thromboelastogram experiments revealed that mononuclear cell groups incubatedfor 22 hours, unstimulated and stimulated with LPS, showed a hypercoagulant effect.In the optical aggregometer, where platelet aggregation was evaluated at the cell level,it was observed that mononuclear cell groups incubated for 22 hours, with or withoutstimulation with LPS, inhibited aggregation.The inhibition of platelets in the aggregometer and the activation of hemostasis inthe thromboelastogram appear to be contradictory results. It can be thought that this effect may be due to the anticoagulant environment in aggregation studies, and theaddition of calcium to the medium in the thromboelastogram better reflects normal physiological conditions.
Although hemostasis is the first response in the process of repairing damage to the tissue, it is a complex event that progresses primarily through the interaction ofplatelets, then other cell groups, and through various molecules. In this process,platelets undertake many tasks. Platelets have important functions such as adhesionfrom the circulation to the injured tissue area, release of granule contents, aggregation,formation of the fibrin network and hemostatic plug, wound healing and migration ofimmune cells to the injured tissue. Platelets establish heterotypic interactions with mononuclear cells during thehemostasis process. In our study, in order to evaluate the effect of mono nuclear cellson the hemostasis process, thromboelastogram, in which the entire hemostasis systemis observed, and optical aggregometer devices, in which platelet aggregation ismonitored at the cell level, were used. Mononuclear cells were evaluated immediatelyafter they were separated from the blood (hour 0) and 22 hours after they were keptunstimulated and stimulated with LPS. The effect of mononuclear cell groups addedto platelet-rich plasma (PRP) on ADP and collagen-stimulated platelet aggregation andthe effect of calcium addition on thromboelastogram parameters, where the normalcoagulant state is restored, was investigated.Thromboelastogram experiments revealed that mononuclear cell groups incubatedfor 22 hours, unstimulated and stimulated with LPS, showed a hypercoagulant effect.In the optical aggregometer, where platelet aggregation was evaluated at the cell level,it was observed that mononuclear cell groups incubated for 22 hours, with or withoutstimulation with LPS, inhibited aggregation.The inhibition of platelets in the aggregometer and the activation of hemostasis inthe thromboelastogram appear to be contradictory results. It can be thought that this effect may be due to the anticoagulant environment in aggregation studies, and theaddition of calcium to the medium in the thromboelastogram better reflects normal physiological conditions.
Description
Keywords
Hemostaz, Trombositler, Mononükleer hücreler, Agregometre, Tromboelastogram, Trombosit-monosit agregasyonu, Hemostasis, Platelets, Mononuclear cells, Aggregometer, Thromboelastogram, Platelet-monocyte aggregation