scholarly journals Changes of doxorubicin distribution in blood and plasma after its inclusion into nanophospholipd formulation

2011 ◽  
Vol 57 (2) ◽  
pp. 174-179 ◽  
Author(s):  
M.G. Zykova ◽  
O.M. Ipatova ◽  
V.N. Prozorovskiy ◽  
N.V. Medvedeva ◽  
A.A. Voskresenskaya ◽  
...  

The drug composition based on the plant phospholipids and the antitumor drug doxorubicin (particle size <30 nm) was obtained using original technology elaborated in the Institute of Biomedical Chemistry (Russian Academy of Medical Sciences). In in vitro experiments demonstrated decreased drug association with blood cells for this nanophospholipid form as compared with free doxorubicin. This was accompanied by a with corresponding increase in its plasma level ans also by drug redistribution from plasma protein fraction to high density lipoproteins. Significance of these changes for doxorubicin biodistributon and antitumor activity is discussed.

1992 ◽  
Vol 11 (3) ◽  
pp. 223-228 ◽  
Author(s):  
Cynthia J. Langlois ◽  
Edward J. Calabrese

Simultaneous exposure to chemicals which can oxidize the haemoglobin of the red blood cell to methaemoglobin is common. Although the effects of some of these agents have been documented individually, little research considers the interactive effects. In-vitro experiments on the treated blood of female Dorset sheep assessed the interactive capacity of chlorite, copper and nitrite to affect methaemoglobin formation. All combinations of doses which produced 2.5, 5, 10% methaemoglobin were tested in all possible combinations (a total of 80), as were the controls. This included data on each chemical alone, each two-way combination and the three-way combination. The response is largely additive (the sum of the individual effects) except for one of the two-way interactions, chlorite/nitrite (P < . 01), which showed antagonism. Chlorite may oxidize nitrite which could explain the less-than-additive response. Overall, the result of combining these agents on methaemoglobin was additive.


Author(s):  
М.Г. Голубева

Введение. В патогенезе многих заболеваний важную роль играют изменения функции гемостаза и нарушение реологических свойств крови. Поиск новых лекарственных препаратов, влияющих на взаимодействие форменных элементов крови в процессе тромбообразования, является одной из актуальных задач современной гематологии. Цель исследования: сравнение влияния малых регуляторных пептидов, являющихся фрагментами нейрогормонов, на взаимодействие эритроцитов с тромбоцитами при их агрегации под действием адреналина в экспериментах in vitro. Материалы и методы. Исследовали пептиды, представляющие собой С-концевые фрагменты нейрогормонов: Pro-Arg-Gly-NH2 — фрагмент вазопрессина, Pro-Leu-Gly-NH2 — фрагмент окситоцина. В опытах in vitro пептиды в концентрации 10–4–10–6 М добавляли к пулу богатой тромбоцитами плазмы (БТП) крыс или к смеси БТП с эритроцитарной массой, разведенной 1:1000 физиологическим раствором, или к отмытым эритроцитам и тромбоцитам и их смеси, и определяли изменение агрегации под действием адреналина в конечной концентрации 0,02 ммоль/л. Агрегацию эритроцитов и тромбоцитов регистрировали на агрегометре. Результаты. Установлено, что С-концевой фрагмент вазопрессина обладает более ярко выраженным антиагрегантным действием, чем фрагмент окситоцина, причем это было установлено как в БТП, так и при использовании отмытых клеток крови. Ингибирующее действие фрагмента Pro-Arg-Gly-NH2 сохранялось и на фоне предварительного усиления агрегации тромбоцитов эритроцитами. С-концевой фрагмент окситоцина практически не влиял на агрегацию тромбоцитов. Заключение. Использование малых регуляторных пептидов позволяет снижать агрегационный эффект эритроцитов, улучшая тем самым терапию при тромботических осложнениях. Introduction. Hemostasis changes and disturbances of blood rheological properties play the important role in pathogenesis of many diseases. One of the actual problems of modern hematology is new drugs investigation for aff ecting on blood cells interaction during thrombus formation. Aim: to compare the eff ect of small regulatory peptides (fragments of neurohormones) on the interaction of erythrocytes with platelets under their aggregation by adrenaline in in vitro experiments. Materials and methods. We studied 2 peptides (C-terminal fragments of neurohormones): Pro-Arg-Gly-NH2 — fragment of vasopressin, Pro-Leu-Gly-NH2 — fragment of oxytocin. In in vitro experiments we added peptides (in concentration of 10–4–10–6 М) to a pool of platelet-rich rat plasma (PRP) or to a mixture of PRP with erythrocyte mass diluted 1:1000 by saline solution, or to washed erythrocytes and platelets and their mixture, and determined the aggregation changes under adrenalin in a final concentration of 0.02 mmol/L. Erythrocytes and platelets aggregation was recorded by aggregometer. Results. We found that C-terminal fragment of vasopressin has a more pronounced antiplatelet eff ect than the oxytocin fragment, and it was found both in PRP and with the use of washed blood cells. The inhibitory eff ect of Pro-Arg-Gly-NH2 fragment also remained under preliminary increasing of platelet aggregation by erythrocytes. C-terminal fragment of oxytocin practically had no effect on platelet aggregation. Conclusion. Use of small regulatory peptides helps to reduce the aggregation eff ect of erythrocytes, thereby improving therapy of thrombotic complications.


1974 ◽  
Vol 10 (2) ◽  
pp. 153-166 ◽  
Author(s):  
Fedor Medzihradsky ◽  
Michael J. Marks ◽  
Joan I. Metcalfe

1961 ◽  
Vol 06 (01) ◽  
pp. 086-097 ◽  
Author(s):  
E Øllgaard

SummaryIn in-vitro experiments, it has been shown that red blood cells and platelets contain a factor which, on addition to a sample of platelet-containing plasma and subsequent rocking of the test tube, causes an aggregation of the platelets which is visible to the naked eye. In equal volumes, the concentration of this factor has been found to be about 5 times as high in platelets as in red cells. The factor is thermostabile, non-protein in nature, and exerts its action independently of the process of coagulation. It is assumed to be carbohydrate in nature. White cells and, to a less degree, plasma and serum seem to be able to destroy the aggregating factor by an enzymatic process.The aggregation is reversible, since white cells as well as certain enzyme poisons and Na+ can reverse the process without any apparent change in the appearance of the platelets. The process observed thus actually seems to be a form of aggregation.


Author(s):  
Abraham A.

The purpose of this manuscript is to report in vitro experiments showing the role of pulsed biomagnetic fields tissues cross-talk between Red Blood Cells (RBCs) and human hairs. Both tissues have been reported to express magnetic properties, ie: RBCs diamagnetic and paramagnetic forces and the hair follicle pulsed diamagnetic forces. This biomagnetic cross-talk is reported as a novel factor in RBCs deformation. In the in vitro experimental model herein used, other forces such as keratin biomagnetism, hydrophilic and hydrophobic properties of the hair shaft may also play a role in the deformation. Presently teardrop red blood cells found in blood smears; and oriented in the same direction are attributed to mechanical artifacts introduced during slide preparations. The data presented in this manuscript supports the new principle of biomagnetic cross talk forces as factor in replicating RBCs deformities.as described in Optical Tweezers Trapping.


Author(s):  
Abraham A. Embi Bs

The purpose of this manuscript is to report in vitro experiments showing the role of pulsed biomagnetic fields tissues cross-talk between Red Blood Cells (RBCs) and human hairs. Both tissues have been reported to express magnetic properties, ie: RBCs diamagnetic and paramagnetic forces and the hair follicle pulsed diamagnetic forces. This biomagnetic cross-talk is reported as a novel factor in RBCs deformation. In the in vitro experimental model herein used, other forces such as keratin biomagnetism, hydrophilic and hydrophobic properties of the hair shaft may also play a role in the deformation. Presently teardrop red blood cells found in blood smears; and oriented in the same direction are attributed to mechanical artifacts introduced during slide preparations. The data presented in this manuscript supports the new principle of biomagnetic cross talk forces as factor in replicating RBCs deformities.as described in Optical Tweezers Trapping.


Author(s):  
Jayanti P Gokhale ◽  
Sanjay S Surana

Present research work describes the development of potential topical treatment containing nanostructured lipid carriers (NLCs) for rheumatoid arthritis (RA). Quercetin (QCT) is a renowned flavonol useful as model drug for carriers. QCT loaded NLCs were prepared and evaluated for particle size distribution, polydispersity index, zeta potential analysis, in vitro drug release study. Ex vivo study was carried out to evaluate the effect of NLCs on cell proliferation (HIG-82 cell line) and inflammation (TNF-α induction in RAW264.7 cells). The QCT-NLCs showed mean particle size of 155.6 ± 1.8 nm and polydispersity index (PDI) was 0.236 ± 0.4, entrapment efficiency of 95.63 ± 0.14 % and zeta potential of -27 ± 1.2 mV. For the ease of application, NLCs were incorporated into the gel base and final formulation was evaluated for rheological study, texture profile, drug release and antiarthritic activity. QCT-NLC gel showed pseudo plastic flow behavior with excellent texture profile parameters. In vitro drug release studies showed that, QCT-NLC gel has more prominent permeation profile as compared with QCT-loaded gel. In vivo activity was carried out using Complete Freund's adjuvant (CFA) induced arthritic model. Evaluation of the severity of rheumatoid arthritis was done by measurements of hind paw volume, arthritis score and haematological parameters such as rheumatoid factor (RF), C-reactive protein (CRP), red blood cells (RBCs), white blood cells (WBCs), erythrocyte sedimentation rate (ESR) and hemoglobin (Hb). Edema and erythema were not observed after administration of QCT-NLC- gel on the rat skin. In conclusion, the results of in vitro and ex vivo studies, QCT-NLC gel appears a viable formulation system for topical delivery of QCT in the treatment of RA.         


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