Interrelation of the changes in the blood rheological properties and the microcirculatory disorders in the early and late stages of experimental hyperlipoproteinemia

Experiments were made on rabbit fed an atherogenic diet (0.5 g/kg cholesterol) singly for 15 and 24 h and repeatedly for 3, 9 and 30 days. At early stages of lipid metabolism distress the interrelationship was established between blood rheological disorders and microcirculatory abnormalities. The dependence of the initial reaction of some rheological characteristics on their initial level was marked.     

Sex-related dimorphism of the morphofunctional characteristics of the epiphysis in newborn children subjected to hypoxic impairment and asphyxia

In 72 newborn children (37 boys and 35 girls) who suffered from prenatal hypoxia and were born in an asphyxic state, we measured the level of melatonin in the umbilicial blood and observed clinical manifestations of the adaptation/stress syndrome. These data were compared with the results of morphological examination of the epiphyses from 27 stillborns (15 boys and 12 girls) who perished because of heavy prenatal hypoxia. The level of melatonin in the blood of ill newborn girls was much higher than that in boys, and both these indices were about two times higher than those in respective groups of healthy newborn children. At the same time, the pathomorphological examination showed that active epiphyseal cell units in the male fetuses were much more numerous. The results show that the epiphysis plays a significant role in determination of the sex-related dimorphism of the adaptation/stress syndrome in newborn children suffering from hypoxia- and asphyxia-evoked heavy CNS damage. The reasons and consequences of more intensive morphofunctional loading of the epiphyseal system in the male fetuses are discussed.     

The development of the epidemic process and the formation of humoral immunity to the hepatitis A virus in adolescent collectives

Additional observation on the formation of humoral immunity to hepatitis A virus has been carried out in 2,375 adolescents aged 15-17 years and belonging to 12 groups at 3 areas of the USSR. This observation has shown that in the presence of a high level of the immune stratum the spread of infection occurs, as a rule, outside the group under observation. Besides, as revealed in this study, the risk of seroconversion and the loss of specific antibodies are, respectively, directly and inversely related to the level of the immune stratum in the group. The level of the immune stratum in a given age group supposedly reflects the intensity of the development of the epidemic process at a definite area.     

Role of alpha-tocopherol and retinol in the antiradical protection of the body in peptic ulcer]

Retinol and tocopherol content, the intensity of spontaneous chemiluminescence as well as concentration of malonic dialdehyde in the blood of practically healthy persons of different age groups and in patients with gastric and duodenal ulcer have been studied. Results are presented. The lower content of tocopherol was revealed in the young persons as compared with other age groups, while the level of vitamin A was not established to depend on age. The content of tocopherol is established to decrease in the blood serum under peptic ulcer. Under these conditions low level of retinol correlates with considerable growth of spontaneous chemiluminescence. Reserve interrelation of tocopherol content in the blood with the level of spontaneous chemiluminescence as well as the absence of true dependence on the concentration of malonic dialdehyde at peptic ulcer are proved. Mechanisms of participation of vitamins E and A in the inhibition of free-radical reactions are discussed, role of their deficiency in pathogenesis fo peptic ulcer is substantiated.     

MSI2通过下调circRNA_001214促进急性髓系白血病细胞HL60生长

Musashi-2（MSI2）是一种RNA结合蛋白质,对维持造血干细胞功能具有重要作用。研究表明,MSI2高表达能促进急性髓系白血病（acute myelocytic leukemia, AML）进展,但其作用机制尚不明确。本研究稳定沉默HL60细胞MSI2后,第1、2、3、4 d对照组的相对细胞生长率分别为1.931 ± 0.027、3.070 ± 0.073、4.017 ± 0.092和4.215 ± 0.246;敲减组分别为1.927 ± 0.035、2.564 ± 0.090、2.825 ± 0.097和3.223 ± 0.182,两组相比具有统计学差异,P<0.001;细胞凋亡明显增加(7.967% ± 0.698% vs 3.400% ± 0.322%., P<0.01);G₀/G₁期细胞比例明显增高（67.430% ± 4.390% vs. 50.360% ± 2.160%, P<0.01）;NUMB蛋白明显上调,LEF1明显下降。环状RNA（circular RNA, circRNA）芯片筛选和荧光定量PCR验证显示,MSI2沉默组circRNA_001214表达水平是对照组3.48倍。这一结果也在NALM6细胞得到证实。进一步用生物信息学分析,显示circRNA_001214最可能与miR-1273a、miR-1273e和miR 5095结合,进而影响参与细胞凋亡相关基因（CYCS、AKT1、BAX、TNFRSF10A、TNFRSF10D）、Wnt信号基因（WNT4、WNT2B、WNT7B、 DKK2、SFRP1、CSNKE1和LEF1）以及参与细胞代谢相关基因（RPE, PGAM4, PGAM1, TAT, CBS、RPE、SUCLG2、PGAM4、PGAM1和 IDNK）。总而言之,MSI2可能通过干扰circRNA_001214生成,减少靶miRNA对凋亡、Wnt信号及细胞代谢相关基因表达的影响,促进细胞生长。     

Compensatory and adaptive changes in the small intestine and liver of rabbits after short-term cholesterol diet

Functional and morphological changes in the intestinal wall and liver were studied in rabbits on short-term cholesterol diet. It was established that with a rapid increase of cholesterol concentration in the general blood flow, the synthesis of high density lipoproteins in the intestinal wall was intensified. Enhanced hepatic elimination of cholesterol and chylomicrons from blood circulation contributes to cholesterol level stabilization in peripheral blood. With high density lipoprotein accumulation in the intestinal wall, cholesterol consumption did not change its concentration in the general blood flow. Structural changes in jejunal and liver mucosa were shown to depend on the degree of hypercholesterolemia and functional damage of these organs.     

慢性心功能不全大鼠心脏和血淋巴细胞β-肾上腺素受体的改变

在主动脉与肾动脉缩窄造成的慢性心功能不全大鼠,血浆儿茶酚胺浓度增高;心脏β-肾上腺素受体(β-AR)数量增加,其中β_1-AR及其mRNA增加,而β_2-AR及其mRNA不变;左心房异丙基肾上腺素(ISO)浓度-收缩效应曲线右移;而心肌ISO浓度-cAMP蓄积曲线无显著改变;血淋巴细胞β-AR数量显著减少.结果提示心功能不全时心脏β_1-AR数量增多,但其介导的正性变力效应反而降低,在cAMP生成以后的信号转导过程或心肌收缩成分功能存在障碍,而血淋巴细胞β-AR的改变与心脏β-AR的功能改变平行.     

Efferent neural apparatus of the thymus gland, spleen and lymph nodes and its reaction to electric stimulation of the posterior hypothalamic field

At a histochemical investigation of the rabbit lymphoid organs innervation certain peculiarities on histotopography of adrenergic and acetylcholinesterase (AChE)-containing nervous elements have been established. At a chronic experiment by means of a dosed repeated bilateral electrostimulation of the posterior hypothalamic field in the organs mentioned, inhibition of the functional activity has been noticed. It is most specific not for the AChE-containing structures, but for the adrenergic ones, localized to some extent in the parenchyma, as well as along the course of the blood vessels and their adventitium. The results are discussed in terms of modulatory influence of the posterior hypothalamic field on trophic and functions of the lymphoid tissue. This influence is realized both humoraly and via the nervous pathways (either directly using certain ways and connections, or indirectly by means of neurogenic tonus of the intraorganic blood vessels regulation).     

Incorporation of influenza virus M-protein into liposomes.

M-protein from influenza virus vaccine was purified by sodium dodecyl sulfate-gel chromatography and incorporated into liposomes by solubilization with octylglucoside and subsequent dialysis. Liposomes containing M-protein formed a distinct population with a density of 1.22 g/ml on sucrose-gradient centrifugation, regardless of the net charge on the liposomes. Treatment of the liposomes by freeze-fracture followed by electron microscopic examination showed multilamellar structures in those liposomes without M-protein; liposomes containing M-protein were mulberry-like structures which appeared unilamellar. These studies show incorporation of M-protein into the lipid bilayer.     

FXR在胃粘膜肠化生及胃癌中的表达及其意义研究

目的:研究FXR在胃炎,胃粘膜肠化生及胃癌组织中的表达,分析其在胃癌发生中的意义。方法:采用免疫组化方法检测FXR在55例胃炎组织,61例胃黏膜肠化生组织及61例胃癌组织中的表达,利用统计学方法 SPSS17.0软件分析其在三种组织中的表达变化,结合文献回顾,分析FXR在胃癌发生中的意义。结果:FXR在胃黏膜肠化生中的表达明显高于胃炎组织(P0.05),而在胃癌组织中,FXR的表达显著低于胃粘膜肠化生组织(P0.05)。结论:FXR是一个潜在的胃癌发生生物标记物,其具体机制有待于进一步探索。