Reduced Calcium Binding Capacity Is an Intrinsic Abnormality of Red Blood Cell Membrane in Spontaneously Hypertensive Rats

1990 ◽  
Vol 3 (7) ◽  
pp. 570-572 ◽  
Author(s):  
Massimo Cirillo
Author(s):  
М.Б. Плотников ◽  
О.И. Алиев ◽  
А.В. Сидехменова ◽  
А.Ю. Шаманаев ◽  
А.М. Анищенко

Согласно современным представлениям, важную роль в прогрессировании артериальной гипертензии (АГ) играет изменение реологических свойств крови. К настоящему времени опубликованы работы, в которых показано улучшение гемореологических параметров за счет использования различных лекарственных средств при сердечно-сосудистых заболеваниях. Цель работы - исследование влияния дигидрокверцетина (ДГК) на артериальное давление (АД) и гемореологические параметры у крыс линии SHR в различные периоды развития АГ. Методика. Эксперименты проведены на крысах со спонтанной гипертензией (spontaneously hypertensive rats, SHR) двух возрастных групп: период развития АГ (возраст крыс SHR на начало эксперимента 5 нед) и период стабильной АГ (возраст крыс SHR на начало эксперимента 11 нед). ДГК (50 мг/кг) вводили внутрижелудочно в течение 6 нед. Крысы контрольных групп получали эквиобъемное количество крахмальной слизи по той же схеме. АД у бодрствующих крыс регистрировали неинвазивным методом (NIBP200A, «Biopac Systems, Inc.», США). Вязкость цельной крови, стабилизированной ЭДТА (в диапазоне скоростей сдвига 15-450 с-1), и плазмы (450 с-1) измеряли на ротационном вискозиметре (LVDV-II+ Pro, CP40, «Brookfield Engineering Labs Inc.») при 36 оС. Гематокрит определяли методом центрифугирования. Агрегацию и деформируемость эритроцитов исследовали на анализаторе «RheoScan-AnD 300» («Rheo Meditech, Inc.»). Результаты. У крыс SHR после 6-недельного введения ДГК в период развития АГ не наблюдалось значимых различий уровня систолического АД (САД), макро- и микрореологических показателей по сравнению с параметрами в контрольной группе. У крыс SHR со стабильной АГ введение ДГК приводило к снижению САД, ослаблению агрегации эритроцитов с увеличением их индекса элонгации и снижению вязкости крови по сравнению с контрольной группой. Заключение. Нарушение гемореологических параметров крови выражено значимо меньше у крыс SHR в начальной стадии формирования АГ. Использование ДГК в период развития АГ не оказывало статистически значимого влияния на АД. В период стабильной АГ гипотензивное действие ДГК связано в том числе с его способностью снижать вязкость крови и улучшать такие микрореологические параметры, как агрегация и деформируемость. Arterial hypertension (AH) is the most common cardiovascular disease and a risk factor for other vascular diseases and organ damage. According to current concepts, changes in blood rheology play an important role in AH progression. Drugs improving hemorheological parameters have been shown to be beneficial in cardiovascular diseases. Aim. To study the effect of dihydroquercetin (DHQ) on blood pressure (BP) and hemorheological parameters in spontaneously hypertensive rats (SHR) at different stages of AH. Methods. Experiments were performed on SHR in the period of AH development (5-week-old SHR at the beginning of experiments) and in the period of stable AH (11-week-old SHR at the beginning of experiments). DHQ (50 mg/kg) was administered intragastrically for 6 weeks. Rats of the control groups received an equal volume of starch mucilage according to the same schedule. BP was measured with a non-invasive NIBP200A (Biopac Systems, Inc., USA) instrument in conscious rats. Viscosity of K2EDTA-stabilized whole blood (shear rate range, 15-450 s-1) and plasma (450 s-1) was measured with a rotational viscometer (LVDV-II + Pro, CP40, Brookfield Engineering Labs Inc.) at 36 °C. Hematocrit was determined by centrifugation. Aggregation and deformability of red blood cells was studied with a RheoScan-AnD 300 analyzer (RheoMeditech, Inc.). Results. After 6 weeks of DHQ administration in the period of AH development, mean blood pressure (MBP) and macro- and microrheological parameters did not significantly differ from the respective values in the control group In SHR with stable AH, the DHQ treatment resulted in decreased MBP, blood viscosity, and red blood cell aggregation and increased red blood cell elongation index compared to the control group. Conclusion. Disorders of hemorheological parameters were significantly less pronounced in SHR with early AH. Perhaps for this reason, the DHQ treatment during the development of hypertension did not exert a significant effect on BP. In the period of stable hypertension, hyperviscosity syndrome progressed in SHR. The antihypertensive effect of DHQ in this period, among other things, was associated with a beneficial effect on micro-rheological parameters, including red blood cell aggregation and deformability, which was evident as decreased blood viscosity.


Pharmaceutics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 99
Author(s):  
Xinyi Wu ◽  
Yichen Li ◽  
Faisal Raza ◽  
Xuerui Wang ◽  
Shulei Zhang ◽  
...  

Multiple drug resistance (MDR) in bacterial infections is developed with the abuse of antibiotics, posing a severe threat to global health. Tedizolid phosphate (TR-701) is an efficient prodrug of tedizolid (TR-700) against gram-positive bacteria, including methicillin-sensitive staphylococcus aureus (MSSA) and methicillin-resistant staphylococcus aureus (MRSA). Herein, a novel drug delivery system: Red blood cell membrane (RBCM) coated TR-701-loaded polylactic acid-glycolic acid copolymer (PLGA) nanoparticles (RBCM-PLGA-TR-701NPs, RPTR-701Ns) was proposed. The RPTR-701Ns possessed a double-layer core-shell structure with 192.50 ± 5.85 nm in size, an average encapsulation efficiency of 36.63% and a 48 h-sustained release in vitro. Superior bio-compatibility was confirmed with red blood cells (RBCs) and HEK 293 cells. Due to the RBCM coating, RPTR-701Ns on one hand significantly reduced phagocytosis by RAW 264.7 cells as compared to PTR-701Ns, showing an immune escape effect. On the other hand, RPTR-701Ns had an advanced exotoxins neutralization ability, which helped reduce the damage of MRSA exotoxins to RBCs by 17.13%. Furthermore, excellent in vivo bacteria elimination and promoted wound healing were observed of RPTR-701Ns with a MRSA-infected mice model without causing toxicity. In summary, the novel delivery system provides a synergistic antibacterial treatment of both sustained release and bacterial toxins absorption, facilitating the incorporation of TR-701 into modern nanotechnology.


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