Department Of Zoology

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    Pseudomonas aeruginosa quorum sensing molecule N-3-oxo-dodecanoyl-Lhomoserine lactone activates human platelets through intracellular calciummediated ROS generation
    (Elsevier, 2018) Yadav, V. K.; Singh, P. K.; Kalia, M.; Sharma, D.; Singh, S. K.; Agarwal, V.
    Pseudomonas aeruginosa, an opportunistic pathogen release N-3-oxo-dodecanoyl-l-homoserine lactone (3-oxo-C12HSL) and N-butyryl-l-homoserine lactone (C4-HSL) quorum sensing (QS) molecules to regulate various virulence factors responsible for infection in the host. 3-oxo-C12 HSL not only regulates the bacterial gene expression but also modulates the host cell system. Thus, it is pertinent to evaluate the effect of these QS molecules on blood platelets which is responsible for the maintenance of hemostasis and thrombus formation. Here, in the present study, we showed that 3-oxo-C12 HSL activates platelets in a dose-dependent manner and induces intracellular calcium-mediated reactive oxygen species (ROS) release, whereas no such effect was observed with C4-HSL. 3-oxo-C12 HSL stimulated ROS release was mediated by NADPH oxidase. Results confirmed the involvement of phospholipase C (PLC) and IP3 receptor behind intracellular calcium-mediated ROS generation. The impact of 3-oxo-C12 HSL on platelet activation suggests that it could interfere and alter the normal function of platelet in individuals infected with P. aeruginosa.
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    Development of lactadherin based electrochemical biosensor for the detection of platelet microvesicles
    (Central University of Punjab, 2018) Santra, Sneha; Singh, Sunil
    Platelet derived microvesicles (PMVs) are the most abundant membrane vesicles in the blood having a potent pro-inflammatory effect, promote coagulation and affect vascular function which are involved in the pathogenesis of cardiovascular disease including diabetes, thrombosis, and coronary artery diseases. Therefore, it is pertinent to detect PMVs level in blood of an individual which have prognostic potential for cardiovascular diseases. As per literature available, lactadherin is a small (53-66 kDa) multifunctional glycoprotein which plays an important role in the clearance of microvesicles. In the present study, lactadherin based electrochemical biosensor for the detection of PMVs was explored. Polythionine film (as a good electron mediator) was electrochemically deposited on ITO-coated glass through electrochemical process involving cyclic voltammetry (CV) and chronoamperometry. Electrochemically deposited electrode provides ideal adsorbing platform for immobilization of RGDS peptide sequences (Lactadherine binding motif) having binding affinity against active conformation of integrin on PMVs surface. CV and Diffusion Pulse Voltammetry (DPV) measurements showed gradual decrease of v current with the subsequent adsorption of microvesicles poor plasma (MPP), microvesicles rich plasma (MRP) and activated platelets. Decrease of current clearly depicts the presence of microvesicles in blood plasma. Our developed fabricated electrode can have a promising potential for its efficient application in clinical testing of various pathological conditions.