Thiamine, pyridoxine, cyanocobalamin and their combination inhibit thermal, but not mechanical hyperalgesia in rats with primary sensory neuron injury

Neuropathic pain after nerve injury is severe and intractable, and current drugs and nondrug therapies offer substantial pain relief to no more than half of affected patients. The present study investigated the analgesic roles of the B vitamins thiamine (B1), pyridoxine (B6) and cyanocobalamin (B12) in rats with neuropathic pain caused by spinal ganglia compression (CCD) or loose ligation of the sciatic nerve (CCI). Thermal hyperalgesia was determined by a significantly shortened latency of foot withdrawal to radiant heat, and mechanical hyperalgesia was determined by a significantly decreased threshold of foot withdrawal to von Frey filaments stimulation of the plantar surface of hindpaw. Results showed that (1) intraperitoneal injection of B1 (5, 10, 33 and 100 mg/kg), B6 (33 and 100 mg/kg) or B12 (0.5 and 2 mg/kg) significantly reduced thermal hyperalgesia; (2) the combination of B1, B6 and B12 synergistically inhibited thermal hyperalgesia; (3) repetitive administration of vitamin B complex (containing B1/B6/B12 33/33/0.5 mg/kg, for 1 and 2 wk) produced long-term inhibition of thermal hyperalgesia; and (4) B vitamins did not affect mechanical hyperalgesia or normal pain sensation, and exhibited similar effects on CCD and CCI induced-hyperalgesia. The present studies demonstrate effects of B vitamins on pain and hyperalgesia following primary sensory neurons injury, and suggest the possible clinical utility of B vitamins in the treatment of neuropathic painful conditions following injury, inflammation, degeneration or other disorders in the nervous systems in human beings.     

不同剂量阿司匹林对血小板功能的作用及临床意义

不稳定性心绞痛 (UA)和急性心肌梗死 (AMI)发病 ,尤其是溶栓前尽速抑制血小板功能有利于病情的控制 ,为此探索国人使用血小板抑制剂的起效时间及合理的用药剂量有重要的临床意义。本文应用不同剂量阿司匹林观察其抑制血小板的起效时间并探讨其临床意义。材料与方法对象1999年 4月 - 2 0 0 0年 10月的 40例可疑冠心病(coronaryheartdisease,CHD)或可疑冠心病稳定性心绞痛和心律失常但无器质性心脏病的住院病人 ,年龄 18- 65岁 ,两周内未服用阿司匹林或影响血小板功能的药物 ,如噻氯匹定 ,潘生丁 ,消炎痛等抗凝剂及抗纤溶剂。凡有出血倾向…     

首次根除幽门螺杆菌失败后二线药物治疗临床研究

目的 研究首次根除幽门螺杆菌（Hp）失败后二线药物的疗效,提高Hp最终根除率.方法 选择我院消化科门诊经胃镜确诊慢性胃炎、消化性溃疡、胃癌等常见上消化道疾病Hp阳性患者,经首次根除Hp失败后病例750例作为研究对象,并随机分为A、B、C三组各250例.A组250例,首先以PPI标准剂量＋果胶铋300 mg＋左氧氟沙星200 mg＋四环素500 mg,bid,治疗7d;之后再以PPI标准剂量＋果胶铋300 mg＋阿奇霉素250 mg＋呋喃唑酮100 mg,bid,治疗7d.B组250例,PPI标准剂量＋果胶铋300 mg＋阿奇霉素250 mg＋呋喃唑酮100 mg,bid,疗程14 d.C组250例,PPI标准剂量＋果胶铋300 mg＋左氧氟沙星200 mg＋四环素500 mg,bid,疗程14 d.结果 A、B、C三组Hp根除率分别为99.0％、86.0％、94.0％.A组大于B组和C组.结论 对于首次根除Hp失败患者,采取PPI＋果胶铋＋左氧氟沙星（或阿奇霉素）＋四环素（或呋喃唑酮）四联14 d疗法有较高的根除率,尤其是A组14 d序贯疗法根除Hp疗效更佳,三组均有用药简单,价格低廉,副作用少,患者依从性好,易于接受等特点.     

猪苓多糖联合乙肝疫苗治疗慢性乙型肝炎128例

目的探讨猪苓多糖联合乙肝疫苗治疗慢性乙肝（CHB）的疗效。方法对128例慢性乙肝患者每日肌注猪苓多糖40mg，连续20d，休息10d，3个月一疗程。皮下注射乙肝疫苗30mg，每隔2周注射1次，连续6次为一疗程。同时口服维生素及一般护肝药物，重点观察对肝功能、蛋白代谢改善情况及对乙肝病毒活性指标的影响。结果猪苓多糖联合乙肝疫苗治疗CHB临床症状缓解率达87．2％，肝功能复常率达84．1％，HBsAg阴转率达11．3％，HBeAg阴转率达43．1％。结论猪苓多糖联合乙肝疫苗治疗CHB疗效肯定，是有效治疗CHB的方法之一。     

Immunochemical quantitation of 3-(cystein-S-yl)acetaminophen adducts in serum and liver proteins of acetaminophen-treated mice

Using a recently developed enzyme-linked immunosorbent assay specific for 3-(cystein-S-yl)acetaminophen adducts we have quantitated the formation of these specific adducts in liver and serum protein of B6C3F1 male mice dosed with acetaminophen. Administration of acetaminophen at doses of 50, 100, 200, 300, 400 and 500 mg/kg to mice resulted in evidence of hepatotoxicity (increase in serum levels of alanine aminotransferase and aspartate aminotransferase) at 4 hr in the 300, 400 and 500 mg/kg treatment groups only. The formation of 3-(cystein-S-yl)acetaminophen adducts in liver protein was not observed in the groups receiving 50, 100 and 200 mg/kg doses, but was observed in the groups receiving doses above 300 mg/kg of acetaminophen. Greater levels of adduct formation were observed at the higher doses. 3-(Cystein-S-yl)acetaminophen protein adducts were also observed in serum of mice receiving hepatotoxic doses of acetaminophen. After a 400 mg/kg dose of acetaminophen, 3-(cystein-S-yl)acetaminophen adducts in the liver protein reached peak levels 2 hr after dosing. By 12 hr the levels decreased to approximately 10% of the peak level. In contrast, 3-(cystein-S-yl)acetaminophen adducts in serum protein were delayed, reaching a sustained peak 6 to 12 hr after dosing. The dose-response correlation between the appearance of serum aminotransferases and 3-(cystein-S-yl)acetaminophen adducts in serum protein and the temporal correlation between the decrease in 3-(cystein-S-yl)acetaminophen adducts in liver protein and the appearance of adducts in serum protein are consistent with a hepatic origin of the adducts detected in serum protein.(ABSTRACT TRUNCATED AT 250 WORDS)     

有机干扰物对含氯消毒剂杀菌效果的影响研究

为了解不同浓度有机干扰物对含氯消毒剂杀菌效果的影响,使用牛血清白蛋白作为有机干扰物,采用悬液定量和载体定量杀菌试验方法进行了实验室观察。结果,用含30 g/L牛血清白蛋白的菌悬液进行试验:有效氯为300 mg/L时可100%杀灭大肠杆菌,需要次氯酸钠溶液作用7.5 m in;三氯异氰尿酸钠片剂和二氯异氰尿酸钠粉剂作用15 m in;以含有效氯2500 mg/L的片剂和粉剂对枯草杆菌黑色变种芽孢作用30 m in,有效氯5000 mg/L次氯酸钠水溶液作用90 m in,杀灭率均达到100%。用含3 g/L牛血清白蛋白的菌悬液进行试验:以含有效氯50 mg/L作用7.5m in,3种剂型含氯消毒剂对大肠杆菌的杀灭率均可达100%。用含有效氯1000 mg/L的片剂和粉剂作用30m in;有效氯2000 mg/L的次氯酸钠水溶液作用60 m in,对枯草杆菌黑色变种芽孢杀灭率均可达100%。用载体法试验:以有效氯300 mg/L次氯酸钠溶液作用7.5 m in,杀灭大肠杆菌100%;以有效氯2000 mg/L次氯酸钠溶液作用60 m in,对枯草杆菌黑色变种芽孢杀灭率100%。结论,在高浓度有机干扰物条件下,含氯消毒剂片剂和粉剂杀灭细菌芽孢剂量明显高于液体制剂;在低浓度有机干扰物条件下,悬液法与载体法对含氯消毒剂杀菌试验结果基本一致。     

Antinociceptive effects of the aqueous extract of Brugmansia suaveolens flowers in mice

The infusion of Brugmansia suaveolens, popularly known as trombeteira or cartucheira, has been used to treat pain in Brazil. The present study was conducted to test for its antinociceptive effects using the abdominal-writhing, formalin, tail-flick, and hot-plate tests in mice. The aqueous extract from B. suaveolens flowers administered intraperitoneally at doses of 100 and 300 mg/kg body weight significantly inhibited acetic acid-induced abdominal constrictions. An increase in hot-plate latency was also observed in animals receiving both doses (100 and 300 mg/kg). In the formalin test, both doses from the aqueous extract inhibited the first (0-5 min) and second phase (20-25 min). Tail-flick assays demonstrated that treatment of animals with plant extract induced attenuation of the response. These results suggest that the aqueous extract from B. suaveolens flowers produced antinociceptive effects, as demonstrated in the experimental models of nociception in mice. This supports popular medicinal uses of this plant as an analgesic.     

B-group vitamin supplementation mitigates oxidative damage after acute ischaemic stroke

Evidence shows that there is a rapid increase in the production of markers of oxidative damage immediately following acute stroke and that endogenous antioxidant defences are rapidly depleted, thus permitting further tissue damage. Several studies point to an antioxidant effect of B-group vitamins and a pro-oxidant effect of elevated plasma tHcy (total homocysteine). In the present study, we assessed whether supplementary B-group vitamins during this critical period will enhance antioxidant capacity and mitigate oxidative damage. Forty-eight patients with acute ischaemic stroke within 12 h of symptom onset were assigned to receive daily oral supplements of B-group vitamins comprising 5 mg of folate, 5 mg of vitamin B2, 50 mg of vitamin B6 and 0.4 mg of vitamin B12 (n=24) or no supplements (n=24) for 14 days. The treatment group and controls were matched for stroke subtype and age. Blood samples were obtained before intervention and also at 7 and 14 days post-recruitment for measurement of the following biomarkers: red cell folate (whole blood folate corrected with haematocrit), erythrocyte glutathione reductase activity coefficient (EGRAC; measure of vitamin B2 status), plasma pyridoxal phosphate (vitamin B6 status), plasma vitamin B12, plasma alpha-tocopherol, plasma ascorbic acid, plasma TAOC (total antioxidant capacity), plasma MDA (malondialdehyde), plasma tHcy and CRP (C-reactive protein). Supplementation for 14 days with B-group vitamins significantly increased the plasma concentrations of pyridoxal phosphate and red blood cell folate and improved a measure of B2 status compared with the control group (P<0.05). Plasma tHcy decreased in both groups albeit less in the control group, but differences in cumulative changes were not significant. There was, however, a decrease in plasma MDA concentration in the treatment group, in contrast with the increase seen in the control group and these differences were significant (P=0.05). CRP concentration, a marker of tissue inflammation, was significantly lower in the treatment group compared with controls (P<0.05). In conclusion, B-group vitamin supplementation immediately post-infarct may have antioxidant and anti-inflammatory effects in stroke disease independent of a homocysteine-lowering effect.     

Preparation of amoxicillin intragastric buoyant sustained-release tablets and the dissolution characteristics

An intragastric buoyant sustained-release tablet (IGB-T) containing 100 mg of amoxicillin (AMX) was prepared to eradicate gastric Helicobacter pylori. A tablet prepared by compressing the mixture of hydroxypropylcellulose-H (HPC-H), citric acid (17.2 mg), sodium hydrogen carbonate (22.8 mg) and AMX was employed as the basic system for preparing IGB-T. The weight and diameter of the tablets were designed to be about 300 mg and 10 mm, respectively. IGB-T containing 5 mg of AMX and HPC-H (255 mg) was buoyant and showed a sustained-release pattern in water. However, when AMX was increased and HPC-H decreased to maintain the tablet weight (300 mg), there was no apparent sustained-release pattern. To prepare IGB-T containing 50 mg of AMX, the surface of the tablet was coated with HPC-H after a tablet was prepared from the mixture of AMX (50 mg), HPC-H (210 mg), citric acid (17.2 mg), and sodium hydrogen carbonate (22.8 mg). This tablet (IGB-T50-Coating) was buoyant and showed a sustained-release pattern in water. However, to complete IGB-T with 100 mg of AMX, it was necessary not only to coat the surface of the tablet but also to use granulated AMX with a particle size of 300–500 μm (IGB-T100-Coating-300-500G). IGB-T100-Coating-300-500G was confirmed to be buoyant for 24 h while maintaining a tablet shape and showed a sustained-release pattern in water and buffer solutions of pH 1.2 and 6.8.     

Dose response effect of rutin a dietary antioxidant on alcohol‐induced prooxidant and antioxidant imbalance – a histopathologic study

The present study was designed to investigate the effect of rutin on ethanol‐induced hepatotoxicity in a dose‐dependent manner in rats. Male albino rats were divided into six groups. Group 1 rats served as control and group 2 rats received rutin 100 mg/kg body weight. Hepatotoxicity was induced in groups 3–6 rats (20% ethanol) for 60 days. In addition, groups 4–6 rats received rutin at doses of 25, 50, 100 mg/kg body weight, respectively for the last 30 days of the experiment. We observed a significant increase in the activities of liver marker enzymes, serum amino transferases, alkaline phosphatase, γ‐glutamyl transpeptidase the levels of thiobarbituric acid reactive substances, conjugated dienes, lipid hydroperoxides, and a decrease in the activities of superoxide dismutase (SOD), catalase (CAT), glutathione and its related enzymes, vitamins C and E when compared to ethanol‐fed rats. Rutin supplementation along with ethanol significantly decreased the levels of liver marker enzymes, lipid peroxidation and significantly elevated the activities of liver SOD, CAT, GSH, glutathione peroxidase, vitamins C and E when compared to untreated ethanol supplemented rats. Among the three doses, 100 mg/kg body weight of rutin was found to exert a more pronounced hepatoprotective effect against ethanol‐induced toxicity. Our results were also confirmed by the histopathologic observations.     

不同剂量舒芬太尼复合曲马多用于老年髋部手术后患者静脉自控镇痛

[目的]评价不同剂量舒芬太尼复合曲马多用于老年髋部手术后静脉自控镇痛（PCIA）的效果.[方法]选择本院在连续硬膜外麻醉下择期髋部手术老年患者60例,随机分为三组.A组：舒芬太尼 50 μg ＋曲马多300 mg;B组：舒芬太尼100 μg ＋曲马多300 mg;C组：舒芬太尼150 μg ＋曲马多300 mg.三组镇痛药物均加入氟哌啶2.5 mg,用生理盐水稀释至100 mL.手术结束前连接PCA泵,镇痛模式为负荷剂量2 mL,持续剂量 1. 2 mL/h, PCA为 2 mL,锁定时间 20 min,全程观察24 h.分别于术后 2～4 h、8～10 h、12～20 h、22～24 h访视记录患者 VAS评分,镇痛药用量、PCA按压次数、Ramsay镇静评分和生命体征及不良反应.[结果]术后 24 h各时段 B、C两组 VAS评分均低于A组（P〈0.05）;与B组相比较,C组8～10 h、12～20 h VAS评分均降低（P〈0.05）;各时段 B、C两组镇痛药用量明显少于A组（P〈0.05）.在 2～4 h、8～10 h时间段 PCA有效按压次数 B、C两组明显低于 A组（P〈0.05）;三组患者各时段 Ramsay镇静评分未见明显差异.[结论]150 μg舒芬太尼复合300 mg曲马多用于老年髋部手术后患者PCIA,临床效果好,安全可靠.     

Blood hydrolysates for microbiological culture media]

Blood hydrolysates contain two times less nucleic acids than meat hydrolysates, the levels of vitamins B2, B3, B6, and B9 are lower in them either. The authors suggest that this is the cause of a poorer growth of microorganisms in culture media with blood hydrolysates, repeatedly reported in literature. They have demonstrated that addition of nucleic acids and vitamins to blood hydrolysates improves the microorganism growth.     

Caffeine withdrawal: a parametric analysis of caffeine dosing conditions

Although caffeine is the most widely used behaviorally active drug in the world, caffeine physical dependence has been only moderately well characterized in humans. Four double-blind experiments were conducted in independent groups of healthy participants to assess the conditions under which withdrawal symptoms occur upon cessation of low to moderate doses of caffeine. In experiment 1, there was no evidence that the range or magnitude of caffeine withdrawal symptoms differed when 300 mg of caffeine was consumed as a single dose in the morning versus 100 mg at three time points across the day. In experiment 2, both the range and severity of withdrawal increased as a function of caffeine maintenance dose (100, 300, and 600 mg/day), with even the lowest dose (100 mg) producing significant caffeine withdrawal. Experiment 3 showed that when individuals were maintained on 300 mg caffeine/day and tested with a range of lower doses (200, 100, 50, 25, and 0 mg/day), a substantial reduction in caffeine consumption (相似文献   

胆红素致新生兔脑瘫动物模型的实验研究

为研制胆红素致脑瘫动物模型,将新生２４ｈ内的仔兔３０只分为正常组Ａ,实验组Ｂ、Ｃ各１０只。实验组Ｂ、Ｃ分别腹腔注射胆红素１００、３００ｍｇ／ｋｇ,正常组与实验组仔兔自然哺育４５ｄ后对其进行神经行为学检查和评分。结果：实验组Ｂ仔兔神经行为得分与正常组Ａ相比差异无显著意义;实验组Ｃ卫兔神经行为得分与正常组Ａ相比差异有非常显著意义;实验组Ｃ中有８只仔兔神经行为得分较高,但与正常组Ａ相比差异仍有非常显著意     

氟哌噻吨美利曲辛片联合B族维生素辅助治疗伴心理障碍的非糜烂性反流病临床疗效

目的观察氟哌噻吨美利曲辛片联合B族维生素辅助治疗伴心理障碍的非糜烂性反流病(NERD)的临床疗效。方法 96例NERD伴心理障碍患者按就诊顺序随机分三组,A组30例,埃索美拉唑;B组32例,埃索美拉唑加维生素B1、维生素B6;C组34例,在B组基础上加用氟哌噻吨美利曲辛片,治疗8周,观察治疗前后患者的临床症状积分变化情况;采用耐信量表诊断NERD,Hamilton抑郁量表进行NERD患者的心理障碍评估。结果 (1)反酸、烧心、胸痛积分:与治疗前比较,A、B、C三组治疗后反酸、烧心、胸痛积分下降(P<0.05);治疗后胸痛积分下降B组、C组均优于A组(P<0.05);治疗后烧心积分下降B组、C组均优于A组(P<0.01)。(2)Hamilton抑郁量表积分:治疗后C组积分明显下降,C组与A、B组比较差异显著(P<0.01)。(3)治疗有效率:A、B、C三组有效率分别是60%,81.25%及97.1%;三组间比较差异有统计学意义(χ2=13.82,P<0.01),A组与C组比较也差异有统计意义(P<0.01)。结论小剂量氟哌噻吨美利曲辛片联合B族维生素对伴心理障碍的非糜烂性反流病有辅助治疗效果,维生素B1和维生素B6可缓解患者胸痛和烧心症状。     

Dietary Micronutrient Intake in Peritoneal Dialysis Patients: Relationship with Nutrition and Inflammation Status

♦ Objective: To compare dietary intake of micronutrients by peritoneal dialysis (PD) patients according to their nutrition and inflammatory statuses.♦ Design: This cross-sectional study evaluated 73 patients using subjective global assessment, 24-hour dietary recall, and markers of inflammation [C-reactive protein (CRP), tumor necrosis factor α, and interleukin 6].♦ Results: Half the patients had an inadequate micronutrient intake. Compared with dietary reference intakes, malnourished patients had lower intakes of iron (11 mg) and of vitamins C (45 mg) and B6 (0.8 mg). Malnourished and well-nourished patients both had lower intakes of sodium (366 mg, 524 mg respectively), potassium (1555 mg, 1963 mg), zinc (5 mg, 7 mg), calcium (645 mg, 710 mg), magnesium (161 mg, 172 mg), niacin (8 mg, 9 mg), folic acid (0.14 mg, 0.19 mg), and vitamin A (365 μg, 404 μg). Markers of inflammation were higher in malnourished than in well-nourished subjects. Compared with patients in lower quartiles, patients in the highest CRP quartile had lower intakes (p < 0.05) of sodium (241 mg vs 404 mg), calcium (453 mg vs 702 mg), vitamin B2 (0.88 mg vs 1.20 mg), and particularly vitamin A (207 μg vs 522 μg).♦ Conclusions: Among PD patients, half had inadequate dietary intakes of iron, zinc, calcium and vitamins A, B6, C, niacin, and folic acid. Lower micronutrient intakes were associated with malnutrition and inflammation. Patients with inflammation had lower intakes of sodium, calcium, and vitamins A and B2. Micronutrient intake must be investigated in various populations so as to tailor adequate supplementation.     

阿司匹林对急性脑梗死患者胃黏膜损伤的临床研究

目的：探讨不同剂量阿司匹林（ASA）对急性脑梗死患者胃黏膜的损伤。方法：137例急性脑梗死患者随机分成ASA治疗组（负荷量／维持量，mg):150/50,300/50,300/100,450/150及对照组，观察服药前和服药后48h、14d临床症状、大便潜血试验、胃镜下胃黏膜表现及胃黏膜病理学指标，采用放免法测定了胃液前列腺素E2（PGE2）和血浆血栓素B2（TXB2）水平。结果：ASA450／150mg组服药后48h大便潜血阳性率、胃镜下胃黏膜病变程度及胃黏膜病理学指标均显著高于300／100mg,150/50mg组及对照组（P值均＜0．01），而胃液PGE2水平较后三组显著降低（P值均＜0．001），后三组间比较无显著差异。结论：急性脑梗死患者服用ASA负量300mg，每日维持量100mg能显著降低血浆TXB2水平，对胃黏膜近期无明显损伤。     

Interaction of granulocyte colony-stimulating factor and high doses of liposomal amphotericin B in the treatment of systemic murine scedosporiosis

Because human infections by Scedosporium prolificans are difficult to treat and show a very poor outcome, new therapeutic strategies are needed. Liposomal amphotericin B (LAMB) (40 mg/kg/day) increased significantly the mean survival time in immunosuppressed mice compared with a control group (22.6 vs. 8.8 days). Amphotericin B deoxycholate (1.5 mg/kg/day) and granulocyte colony-stimulating factor (G-CSF) (300 μg/kg/day) were ineffective. The combination of LAMB (40 mg/kg/day) and G-CSF (150 or 300 μg/kg/day) did not improve the results obtained with LAMB alone.     

The effect of estrogen replacement therapy on total plasma homocysteine in healthy postmenopausal women

OBJECTIVE: To clarify the effect of estrogen on total plasma homocysteine concentration and on the concentration of vitamins required for homocysteine metabolism (folate, vitamin B12, and vitamin B6). METHODS AND RESULTS: We measured total fasting plasma homocysteine in 16 healthy postmenopausal women before and 6 hours after a methionine load (100 mg/kg); fasting concentrations of folate, vitamin B12, vitamin B6, total cholesterol, low-density lipoprotein cholesterol, and high-density lipoprotein cholesterol were also determined. After 6 months of estrogen replacement therapy with estradiol, 2 mg daily, and 1 cycle of quarterly methoxyprogesterone acetate, 5 mg daily administered on the 91st through 100th days, measurements were repeated. There was no significant change in mean +/- SD fasting homocysteine concentration (8.8+/-2.5 vs 8.5+/-2.0 micromol/L; P=.30); homocysteine concentrations after methionine load increased from 38.8+/-12.3 to 51.1+/-12.5 micromol/L (P=.01). During this time period, no significant changes occurred in the concentrations of folate (11.7+/-4.4 vs 9.8+/-4.1 nmol/L; P=.06), vitamin B12 (394+/-182 vs 411+/-155 pmol/L; P=.40), or vitamin B6 (pyridoxal phosphate) (26+/-21 vs 36+/-25 nmol/L; P=.15). The mean +/- SD concentration of low-density cholesterol declined 20% (from 147+/-32 to 118+/-37 mg/dL) and high-density lipoprotein increased 16% (from 40+/-13 to 46+/-19 mg/dL) during the study period. CONCLUSIONS: Six months of estrogen replacement therapy did not lower fasting plasma total homocysteine concentrations and raised homocysteine concentrations following a methionine load. Lipid profiles improved significantly during the study period. A reduction in homocysteine concentrations is not likely to contribute to the reduction in cardiovascular events seen with estrogen replacement therapy.     

Antitumor effect of the organogermanium compound Ge-132 on the Lewis lung carcinoma (3LL) in C57BL/6 (B6) mice

Effects of the organogermanium compound Ge-132 (i.p.) were examined on the 3LL local tumor (1 X 10(5)/mouse, s.c.) and its pulmonary metastases in B6 mice. A characteristic feature of its action was the preferential antimetastatic effect under strictly defined conditions. Either inhibition or facilitation was observed depending on the treatment schedules; 7 daily doses of 100 mg/kg yielded the inhibition ratio 49% when started from day 1, whereas the treatment from day 8 resulted in the ratio -99%. The maximum inhibition was obtained at 100 mg/kg. The postsurgical-adjuvant treatment with Ge-132 was of no beneficial effect. The local tumor growth was affected only marginally and temporarily. When inoculum size was minimized (1 X 10(4)), a single dose of 300 mg/kg on day 1, but not on day 8, was effective in prolonging the latency before tumor take. The antitumor action of Ge-132 was discussed with reference to its interferon (IFN)-inducing activity.