Low serum selenium and glutathione peroxidase activity in patients receiving short-term total parenteral nutrition

Selenium status was determined in 15 consecutive postoperative patients receiving short-term total parenteral nutrition (TPN) using both serum selenium concentration and glutathione peroxidase (GSH-Px) activity as an indicator of body selenium status. The serum selenium concentration was significantly (p less than 0.001) lower in TPN patients (0.52 +/- 0.16 mumol/l, mean +/- SD) than in age- and sex-matched controls (1.08 +/- 0.17 mumol/l). Serum selenium in TPN patients ranged from 0.28 to 0.79 mumol/l and was associated with the duration of TPN. The lowest selenium values was found in patients who had received TPN over 3 weeks (0.35 +/- 0.06 mumol/l) as compared to patients receiving TPN for 1-3 weeks (0.61 +/- 0.13 mumol/l; p less than 0.01). Serum GSH-Px activity in TPN patients was also low (116 +/- 21 U/l) and ranged from 75 to 159 U/l. A significant positive correlation was found between serum selenium and GSH-Px activity (r = 0.520; p less than 0.05) whereas serum selenium and GSH-Px activity did not correlate significantly with liver function tests and body mass index. This study suggests that also short-term TPN patients may be at risk of selenium deficiency.     

Selenium status in psoriasis and its relations to the duration and severity of the disease

OBJECTIVE: We examined the role of selenium (Se) status in psoriasis and its relation to the severity and duration of the disease. METHODS: The study was conducted among 30 patients with psoriasis of less than 10 mo duration (study group 1, sg 1) and 30 with psoriasis of more than 3 y duration (study group 2, sg 2). Control groups (cg) consisted of 30 patients with short periods of skin disorders other than psoriasis and 24 healthy volunteers (cg 1 and cg 2, respectively). Plasma Se concentration and glutathione peroxidase (GSH-Px) activity in plasma and erythrocytes were measured to determine Se status. RESULTS: Plasma Se (microg/L) levels were 47.11 +/- 11.61 in sg 1, 38.69 +/- 13.22 in sg 2, 43.53 +/- 11.73 in cg 1, and 48.71 +/- 9.39 in cg 2; plasma GSH-Px (U/mL) levels, were 0.15 +/- 0.04, 0.14 +/- 0.04, 0.16 +/- 0.04, and 0.18 +/- 0.03, respectively; and erythrocyte GSH-Px (U/g of hemoglobin) levels were 13.97 +/- 4.27, 13.16 +/- 3.85, 14.25 +/- 3.84, and 14.35 +/- 3.35, respectively. Erythrocyte GSH-Px correlated inversely to severity of psoriasis in sg 2 (r = -0.37, P < 0.05). CONCLUSION: Se status is depressed and related to the severity of the disease only in patients with psoriasis lasting more than 3 y.     

口服亚硒酸钠和维生素E对高海拔地区心血管病患者甲状腺激素的影响

目的探讨使用亚硒酸钠和维生素E对高海拔地区心血管病患者甲状腺激素的影响.方法将心血管病患者随机分为3组A组42例患者口服亚硒酸钠,同时加服维生素E;B组28例患者口服亚硒酸钠;对照组20例,未服用亚硒酸钠及维生素E.观察对象分别于治疗前和治疗6个月后抽血检测血清硒(Se)、血浆谷胱甘肽过氧化物酶(GSH-Px)活力、丙二醛(MDA)含量及甲状腺激素(T3、T4)等指标,以观察远期疗效.结果治疗后A组和B组血清Se含量[(0.71±0.22)、(0.68±0.18)μmol/L]明显高于治疗前[(0.31±0.17)、(0.33±0.14)μmol/L],差异有显著性(P＜0.01);A组和B组血浆GSH-Px活力分别为(87.12±13.61)、(84.79±12.13)U/L,较治疗前[分别为(58.43±18.93)、(57.12±17.36)U/L]明显增加.A组和B组MDA含量[(4.86±1.18)、(4.18±1.23)nmol/ml]较治疗前[(8.66±0.96)、(8.71±0.87)nmol/ml]明显降低,差异均有显著性(P＜0.01);A组和B组患者T3和T4较对照组明显降低,趋于正常.血清Se与血浆GSH-Px呈正相关(r=0.781,P＜0.01),与MDA、T3、T4浓度呈负相关(r=-0.385;r=-0.687;r=-0.412,均P＜0.05).甲状腺激素恢复正常者A组31例(73.81%)、B组20例(71.42%);部分恢复者A组4例(9.52%)、B组2例(7.43%),其恢复率明显高于对照组,差异有显著性(P＜0.05),远期疗效较好.结论补充适量硒和维生素E可纠正高原环境下因低Se而引起的甲状腺激素代谢异常.     

Selenium status in term and preterm infants during the first months of life

OBJECTIVE: We hypothesized that very low birth weight (VLBW) infants have reduced serum and red blood cell (RBC) selenium (Se) at birth, which decrease further with current nutrition and are associated with chronic lung disease and septicaemia. DESIGN: We studied Se intake, concentration in serum and RBCs and glutathione peroxidase (GSH-Px) activity in preterm and term infants from birth until 16 weeks. Data are mean+/-standard deviation (s.d.). SETTING: Seventy-two preterm infants in two groups, born in Berlin, gestational age 26+0/30+0 weeks, birth weight 845/1270 g, with low Se intake (2.2+/-0.8/2.5+/-1.2 microg/kg/day), and 55 term infants, gestational age 39+1 weeks, birth weight 3160 g, born in Venezuela (high Se intake: 29+/-8 microg/day). RESULTS: A balance study in 10 preterm infants showed that Se is well absorbed from human milk (77+/-9%). Serum concentration was higher in term (142.0+/-40.0 microg/l) than in preterm infants (17.8+/-8.1/19.9+/-2.2 microg/l) at 4/7 weeks. Serum and RBC concentration of Se declined in all infants, low values in preterm infants did not correlate with chronic lung disease and septicaemia. GSH-Px activity in RBCs remained stable until 6 weeks of age in all infants and was not correlated with Se in RBCs. CONCLUSIONS: Se concentration in serum decreases during the first weeks of life and depends on intake. GSH-Px activity is not useful as a marker for Se status in infants up to 16 weeks after birth.     

Effect of various levels of selenium in wheat and meat on blood Se status indices and on Se balance in Dutch men

After a 5-week period of low selenium intake, twenty-four Dutch men received 55, 135 or 215 micrograms Se/d as Se-rich meat or bread for a 9-week period. Four unsupplemented subjects served as controls. Plasma Se increased more rapidly than erythrocyte Se levels; the increases were significantly dependent (P less than 0.001) on Se intake level. Glutathione peroxidase (EC 1.11.1.9; GSH-Px) activity in platelets increased rapidly after supplementation and plateaued after 4-9 weeks. At 10 weeks after supplementation ended, plasma Se levels and platelet GSH-Px were still higher than the baseline values whereas erythrocyte Se levels continued to increase. Except for the higher erythrocyte Se levels after supplementation with high-Se meat, there were no differences in bioavailability of Se between meat and wheat products. Daily urinary and faecal Se excretions as well as Se retention increased with an increased Se intake irrespective of the form of the supplement. Regression of Se excretion v. intake indicated that 33 micrograms Se/d is necessary to compensate for urinary and faecal losses.     

Selenium status prior to and during one month total parenteral nutrition in gastroenterological patients: A randomised study of two dosages of Se supplementation

13 consecutive adult gastroenterological patients with non-malignant disease who were candidates for total parenteral nutrition (TPN), and who had mild protein-energy malnutrition (82 +/- 3% of ideal body weight, serum albumin 32 +/- 2 g/l, mean +/- SEM) were found to have, prior to TPN, a Selenium level 50% less than controls (p < 0.001) as assayed by Se and glutathione peroxidase (GSHPx) in plasma and erythrocytes. Compared with other trace metals and minerals, eg, Mn, Zn and Cu, depletion of Selenium was the most marked in this population. Patients were randomised to be supplemented with either 100 or 200 mug/d of sodium-selenite, equal to 32 mug (0.4 mumol) or 64 mug (0.8 mumol) of selenium, in two cross-over periods of TPN, each of two weeks. In this short term study, significant increases in the four measurements of Se status (p < 0.05) were seen in all patients, but there was no difference between those receiving the high or low dose of the element. GSHPx in plasma was normalised within 1 month whereas the increase seen in the erythrocyte pool was consistent with a 4-month half-life. Pooled Se values for patients and controls showed logarithmic correlations between Se and GSHPx in erythrocytes (p < 0.001) and plasma (p < 0.01). Changes in GSHPx provided further evidence of Se depletion in our patients. This study suggests that malnourished gastroenterological patients receiving TPN require Se supplements and that 100 mug (0.4 mumol)/d of sodium-selenite is adequate for most patients since there was no additional benefit from the higher dose of 200 mug (0.8 mumol).     

Bioavailability of selenium in mushrooms, Boletus edulis, to young women

The bioavailability of selenium (Se) in mushrooms, Boletus edulis, to young Finnish women was studied by giving them 150 micrograms Se as mushrooms for 4 weeks. The indicators of body selenium status were plasma and erythrocyte Se levels and plasma and platelet glutathione peroxidase (GSH-Px) activity. The Se level in erythrocytes increased significantly (26%), while only slight enhancement were found in plasma Se and plasma or platelet GSH-Px activity. The results indicate that the metabolism of mushroom-Se is different from that of wheat-Se or sodium selenate. However, by the criteria of plasma Se level or plasma and platelet GSH-Px activity the bioavailability of mushroom-Se is reasonably low.     

Selenium content and glutathione peroxidase activity of milk from vegetarian and nonvegetarian women

The concentration of selenium (Se) in milk samples obtained from 26 lacto-ovo-vegetarian (vegetarian) women was significantly greater (22.2 +/- 0.8 ng/ml) than from 12 nonvegetarian women (16.8 +/- 1.3). Mean GSH-Px activity (EC 1.11.1.9) in milk from vegetarians was 146% of that in milk from nonvegetarians. A significant correlation between GSH-Px activity and Se concentration was observed (r = 0.76). Likewise a significant correlation was observed between milk linoleic acid content and GSH-Px activity (r = 0.68). In undialyzed samples from vegetarian women, most of the increased content of Se was found in fractions containing proteins of 100 kdaltons (kD) or more. The high glutathione peroxidase activity in milk from vegetarians was associated with selenoproteins in the 90 to 100 kD range. A distinct 40 kD Se peak was also detected in milk from vegetarians. There was no difference in Se intake between the two groups of women. Therefore, although data from the present study show that both the quantity and distribution of Se in human milk can be modified by the maternal diet, the increased Se content and GSH-Px activity in milk from vegetarians cannot be explained by an increased Se intake.     

小儿弱视与微量元素硒的关系及其临床意义

目的:观察微量元素硒及相关生物活性物质对小儿弱视影响以及硒治疗的效果。方法:将弱视患儿随机分为两组:在常规使用遮盖加精细目力训练的基础上,A组37例患儿口服亚硒酸钠0.5 mg/d,连服1周,以后每周0.5 mg,疗程6个月;B组31例患儿未服用亚硒酸钠。观察对象分别于治疗前和治疗6个月后抽血检测血清硒(Se)、血浆谷胱甘肽过氧化物酶(GSH-PX)活力及丙二醛(MDA)含量等指标,随访1年,以观察远期疗效。结果:治疗后A组血清Se(0.034±0.016)mg/L明显高于治疗前(0.013±0.008)mg/L,差异有显著性(P<0.01);A组血浆GSH-PX活力为(87.12±13.61)IU/L,较治疗前(53.62±18.70)IU/L明显增加,差异有显著性(P<0.01)。A组MDA含量(6.46±1.55)nmol/m l,较治疗前(8.68±1.49)nmol/m l明显降低,差异有显著性(P<0.05)。血清Se与血浆GSH-PX呈正相关(r值=0.781,P<0.01),与MDA呈负相关(r值=-0.385,P<0.05)。患儿视力恢复正常者A组22例(59.46%),B组11例(35.48%);视力进步者A组12例(32.43%),B组12例(38.71%);视力恢复率A组明显高于B组(2χ值=3.896,P<0.05),远期疗效较好。结论:用亚硒酸钠治疗该地区弱视患儿有明显的治疗效果;Se水平低表明该地区小儿弱视可能与缺硒有关。提示补充适量硒可提高该地区因低硒引起的弱视患儿的视力。     

Serum levels of coenzyme Q10 and lipids in patients during total parenteral nutrition

Serum levels of coenzyme Q10 (CoQ10) as well as lipids were determined in patients during total parenteral nutrition (TPN). The mean CoQ10 levels (M +/- SD) were 0.77 +/- 0.30 microgram/ml for 108 normal subjects and 0.59 +/- 0.35 microgram/ml for 95 patients before TPN. The mean CoQ10 level of the patients decreased significantly to 0.35 +/- 0.23 microgram/ml one week after the start of TPN, and then remained almost unchanged during TPN for up to 6 weeks. When the patients receiving TPN (TPN patients) were grouped according to their clinical diagnoses, the mean CoQ10 level of patients with cancer was significantly lower than that of the other patients without cancer in 4 week therapy, but there was no difference in the levels between the patients with and without diseases of the gastrointestinal tract. Serum levels of total cholesterol (T-Chol) and esterified cholesterol in TPN patients also declined below their respective normal ranges, but not to the same extent in comparison to CoQ10. The levels of triglycerides (TG), phospholipids (PL), non-esterified fatty acids, low density lipoproteins, very low density lipoproteins, chylomicrons, and cholesterol in the high density lipoprotein fraction in serum of TPN patients were within their normal ranges. The levels of CoQ10 in TPN patients were correlative to those of T-Chol, TG, and PL, and decreased rapidly prior to the latter levels.     

微量营养素补充对儿童机体抗氧化及DNA氧化损伤影响的研究

目的通过营养调查了解农村儿童抗氧化营养素的摄入情况和观察补充五种营养素对儿童机体抗氧化能力及淋巴细胞DNA氧化损伤的影响。方法选择某农村9～11岁健康儿童82名,随机分为补充营养素组(补充组)和对照组,每组41名,采用24h膳食回忆法进行膳食调查。补充组儿童每日补充抗氧化营养素片[含维生素A(VA)600μg、维生素E(VE)100mg、维生素C(VC)300mg、β胡萝卜素(βC)1mg和亚硒酸钠(Se)200μg],而对照组则服用相同颜色和包装的安慰剂,试验期为8周。分别于补充前和补充结束时采集血样,分析两组血浆VA、VE、VC、βC、Se、谷胱甘肽过氧化物酶(GSHPx)、超氧化物歧化酶(SOD)、丙二醛(MDA)水平以及淋巴细胞DNA自发性损伤和H2O2(5、10、25μmol/LH2O2)诱导的氧化损伤。结果膳食调查结果表明,农村儿童VA、VC和硒摄入量偏低,分别为推荐营养素摄入量(RNI)的50.6%、65.6%和67.3%。营养素补充8周后,补充组儿童血浆中βC、VA、VE、VC和Se的水平与对照组相比分别提高了13.4%、32.8%、11.5%、46.9%和24.6%(P<0.01)。GSHPx酶的活性达到161.7酶活力单位/ml,明显高于补充前(100.4酶活力单位/ml)和对照组(110.2酶活力单位/ml)(P<0.01),而血浆中MDA的水平由补充前7.2nmol/ml下降到干预后的4.6nmol/ml(P<0.01)。补充组血浆中SOD水     

丙烯腈对大鼠睾丸抗氧化酶活力和脂质过氧化水平的影响

目的　探讨丙烯腈(ACN)的雄性生殖毒性机制。方法　健康雄性SD大鼠分别以0、7.5、15.0、30.0 mg/kg剂量腹腔注射ACN染毒,测定其睾丸谷胱甘肽(GSH)、丙二醛(MDA)含量和超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH Px)、谷胱甘肽S 转移酶(GST)活力。结果　ACN染毒4周后,15.0、30.0 mg/kg组大鼠睾丸GSH含量[(7.44±0.96)、(6.95±0.77)mg/g pro]增加,30.0 mg/k组大鼠GSH Px活力[(70.89±4.01)U/mg pro]升高,与对照组的差异均有统计学意义(P<0.05,P<0.01)。ACN染毒8周后,30.0 mg/kg组大鼠睾丸GSH含量[(2.50±0.94)mg/g pro]降低,15.0、30.0mg/kg组大鼠SOD活力[(102.08±16.08)、(113.30±17.20)NU/mg pro]升高,与对照组的差异均有统计学意义(P<0.01)。ACN染毒13周后,15.0、30.0 mg/kg组大鼠睾丸GSH含量降低,30.0 mg/kg组GST活力下降,各染毒组GSH Px活力均低于对照组,30.0 mg/kg组MDA含量[(0.68±0.16)nmol/mgpro]高于对照组[(0.38±0.12)nmol/mg pro],差异均有统计学意义(P<0.01)。停止染毒后2周,大鼠睾丸GSH水平恢复;30.0 mg/kg组大鼠睾丸MDA含量下降,但仍高于对照组,GSH Px活力仍低于对照组,差异均有统计学意义(P<0.05)。结论　ACN能通过破坏氧化-抗氧化体系的平衡,诱导雄性大鼠睾丸脂质过氧化损伤。     

Patterns of plasma leptin and insulin concentrations in hospitalized patients after the initiation of total parenteral nutrition

BACKGROUND: The regulation of leptin in patients with critical illness is poorly understood. Sex, diet, body mass, and cytokines may all play a role. OBJECTIVE: The aims of this study were to determine the factors influencing leptin concentrations in hospitalized patients beginning total parenteral nutrition (TPN) and whether a 3-d regimen of TPN would further increase plasma leptin concentrations above baseline. DESIGN: Twenty-six patients requiring TPN were enrolled in this prospective, nonintervention study. Only 20 (11 women and 9 men) completed all 3 d of TPN. RESULTS: Baseline plasma leptin in the TPN patients ranged from 62.5 to 1625 pmol/L ( +/- SD: 419 +/- 387; n = 26) and was not significantly different between men (444 +/- 494 pmol/L) and women (363 +/- 244 pmol/L). Baseline plasma insulin ranged from 76 to 695 pmol/L (271 +/- 188; n = 26) and was not correlated with plasma leptin. Leptin concentrations increased after 3 d of TPN, from 356 +/- 300 to 794 +/- 600 pmol/L (P < 0.05) in parallel with an increase in insulin from 257 +/- 187 to 979 +/- 917 pmol/L (P < 0.01) in the 20 patients who completed the study; however, the changes were not correlated when expressed as percentages. Although the men and women had insulin responses to feeding that were not significantly different, leptin concentrations did not increase significantly in men but increased 3-fold in women (to 1094 +/- 638 pmol/L; P < 0.01). CONCLUSIONS: Leptin regulation in patients with a critical illness differs substantially from that in healthy persons. The importance of glucose and insulin in leptin secretion remains unclear, especially in men.     

The effect of selenium supplementation on selenium status of patients receiving chronic total parenteral nutrition

Patients receiving long-term total parenteral nutrition (TPN) are at risk for selenium deficiency. The purpose of this study was to determine the effect of parenteral selenium as selenious acid on the selenium status of seven long-term TPN patients. Patients received a dosage of zero, 80, or 160 micrograms Se/day for 1 month each. The measures of selenium status used were selenium levels in plasma and glutathione-peroxidase activities in erythrocytes and platelets. Urinary selenium excretion was measured. Control subjects were selected to match the sex, age, and weight of the patients. With increasing levels of parenteral selenium, there was increasing plasma selenium concentration as well as erythrocyte and platelet glutathione-peroxidase activity. There was no statistical difference between the patients during the time they received the 160 micrograms parenteral selenium treatment and the control subjects for platelet glutathione-peroxidase activity. At the 160 micrograms Se/day level, patient plasma selenium concentrations increased from 28% to 58% of the control levels. Four patients were studied after they returned to the 80 micrograms parenteral selenium/day from the 160-micrograms Se/day treatment. With decreasing parenteral selenium, three patients had decreasing platelet glutathione-peroxidase activity, while plasma selenium concentration decreased in two patients. These data suggest that some patients receiving long-term parenteral nutrition should receive parenteral selenium.     

硒掺入缺硒大鼠血小板、肝及血浆的动力学研究

给缺硒大鼠一次大剂量注射含~(75)硒的硒化合物。测定血小板,肝、血浆谷是胱甘肽过氧化物酶活性及~(75)硒含量。结果表明,血小板谷胱甘肽过氧化物酶活性反映一次大剂量硒摄入时的一个良好指标。同时证明血小板GSH-Px变化与肝GSH-Px变化一致。以两种不同形式硒化合物(亚硒酸钠和硒蛋氨酸)给予缺硒大鼠,两组大鼠血小板、肝、血浆中GSH-Px活性是相似的,但~(75)硒含量亚硒酸钠组显著低于硒蛋氨酸组,由此表明,硒蛋氨酸中部分硒没有掺入到血小板的GSH-Px中去,推测在体内硒可能存在其它代谢途径,这是很值得探讨的问题。     

Motility of the gastrointestinal tract and gallbladder during long-term total parenteral nutrition in dogs

BACKGROUND: The motility of the gastrointestinal tract during total parenteral nutrition (TPN) remains poorly understood. The objective of this study was to determine the motility pattern not only in the gastrointestinal tract but also in the gallbladders of dogs maintained by TPN. METHODS: Central venous catheters were inserted through the external jugular vein of 5 dogs and 6 strain gauge force transducers were sewn to the stomach, small intestine, and gallbladder. Two weeks later, oral food was discontinued and motility was recorded for 24 hours after the first migrating motor complex (MMC) was confirmed in the stomach as pre-TPN. TPN was started and continued for 4 weeks, and patterns of motor activity during TPN were recorded for 24 hours at the end of each week. RESULTS: The durations of MMC in the stomach, duodenum, and gallbladder in pre-TPN were 118 +/- 3 minutes, 118 +/- 2 minutes, and 118 +/- 2 minutes, respectively, but in the first week of TPN they were 432 +/- 56 minutes, 431 +/- 56 minutes, and 386 +/- 29 minutes, respectively. TPN times were significantly longer than those of pre-TPN (corrected p < .005). The durations of MMC in jejunoileum did not alter between pre-TPN and TPN. The occurrences of phase III in the stomach, duodenum, and gallbladder in pre-TPN were 12/d, but during TPN they were reduced significantly (corrected p < .005). CONCLUSIONS: TPN did not affect the motility of the jejunoileum but did inhibit the motor activities of the stomach, duodenum, and gallbladder. The inhibition of gallbladder contraction observed during TPN may be one of the factors inducing gallbladder disease.     

硒对高碘小鼠肝脏两种含硒酶的影响

目的:研究硒对高碘小鼠肝脏含硒酶的影响,探讨硒干预高碘危害的机制。方法:40只雌性Balb/c小鼠按体重随机分为4组:正常对照组(NC);高碘对照组(HI),饮用3.0mg/LI的高碘水;高碘+硒I组(HI+Se1),高碘水中补充0.5mg/LSe;高碘+硒II组(HI+Se2),高碘水中补充1.0mg/LSe。5个月后,观察甲状腺病理变化,测定血清总T4(TT4)、总T3(TT3)、反式T3(rT3)水平以及肝脏硒含量、谷胱甘肽过氧化物酶(GSH-Px)活性、1型脱碘酶(DI-1)活性及mRNA表达。结果:高碘组小鼠出现了弥漫胶质性甲状腺肿;与正常对照组相比,高碘组的血清TT4水平显著升高,TT3水平显著降低;而补硒可显著抑制TT4的升高和TT3的降低;高碘组肝脏硒含量降低,MDA含量显著升高,GSH-Px和DI-1活性分别降低了47%和33%,DI-1mRNA的表达也下调。而两个补硒组能显著升高肝硒含量,增强GSH-Px活性以及DI-1活性和表达,其中以0.5mg/L的硒剂量作用最为明显。结论:适当剂量的硒可通过影响含硒酶的活性和mRNA的表达来发挥对高碘危害的干预作用。     

Supplementation with selenium-rich bread does not influence platelet aggregation in healthy volunteers.

In order to establish the effect of an increased dietary selenium supply on platelet glutathione peroxidase (EC 1.11.1.9.; GSH-Px) and platelet aggregation, six healthy subjects were supplemented with 200 micrograms Se as Se-rich bread for 6 weeks. Another six subjects received low-Se bread and served as controls. Platelet GSH-Px activity increased significantly in the supplementation group, whereas no effect could be observed on platelet aggregation. The results of this study do not support the hypothesis that an increased dietary Se intake has a favourable influence on platelet aggregation.     

大豆异黄酮和皂甙对糖尿病大鼠抗动脉粥样硬化活性的研究

目的　研究大豆异黄酮和皂甙 (SPE)对糖尿病大鼠血糖、血脂、血浆脂蛋白脂质过氧化及血小板聚集活性的影响。方法　取 16只GK/Jcl雄性大鼠 (2型糖尿病模型 ) ,随机分为 2组 :对照组喂普通饲料 ,实验组喂添加 2 0g/kgSPE的饲料 2 0周 ,观察血液生化指标的变化。血浆脂蛋白采用序列超速离心分离法分离。结果　喂饲SPE的糖尿病大鼠血糖为 (11 9± 0 9)mmol/L ,动脉粥样硬化指数为 0 4 0± 0 14 ,血浆过氧化脂质水平为 (15 7± 0 5 )mmol/L ;未喂饲SPE的对照组糖尿病大鼠上述指标分别为 (14 2± 2 0 )mmol/L、0 5 8± 0 2 2和 (2 0 7± 3 0 )mmol/L ,差异有显著意义。由ADP和胶原蛋白诱导的血小板聚集率两组分别为 (5 4 1± 8 8) %和 (5 8 0± 7 9) %、(6 6 6±12 4 ) %和 (6 9 6± 9 4 ) % ,差异有显著意义。结论　SPE具有明显的降低血糖、改善动脉粥样硬化指数、抑制脂质过氧化和血小板聚集的作用 ,对大鼠糖尿病及其动脉粥样硬化并发症的发生可起到积极的预防和控制作用。