首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 156 毫秒
1.
中药渣发酵物对母猪繁殖性能和血浆指标的影响   总被引:1,自引:0,他引:1  
为了探讨中药渣发酵物在母猪饲粮中的添加效果,试验选用2~6胎次长白×大白二元妊娠母猪32头,随机分为对照组和试验组,单栏饲养。于妊娠90 d至产后28 d,对照组饲喂基础饲粮,试验组在基础饲粮中添加0.5%中药渣发酵物。于分娩当天记录产活仔数、死胎数和木乃伊数,称取仔猪出生窝重;于产后21 d称取仔猪断奶窝重,计算断奶窝增重。分别于母猪妊娠110 d及产后21 d测量母猪的背膘厚,计算背膘损失;于分娩当天和产后21 d耳缘静脉采集母猪血液,肝素抗凝,离心分离血浆,用于血浆生化参数和抗氧化性能指标测定。结果表明:与对照组相比,试验组仔猪的断奶窝增重有升高趋势(P=0.068),断奶后1~7 d发情率呈升高趋势(P0.05),分娩当天血浆ALT活性和MDA含量显著降低(P0.05)、UN浓度显著升高(P0.05),产后21 d血浆AST活性显著降低(P0.05)、UN浓度显著升高(P0.05)、SOD活力有升高趋势(P=0.063)。上述结果表明,中药渣发酵物可在一定程度上提高母猪的繁殖性能、增强抗氧化能力,增加仔猪断奶窝增重。  相似文献   

2.
选取新生仔猪18窝,随机分为对照组和处理组各9窝。从12日龄开始,对照组饲喂基础乳猪料;处理组在基础乳猪料中添加半胱胺,剂量为120mg/kg饲料。两组仔猪均在35日龄断奶。分别于断奶前7d(28日龄,D28),断奶当天(D35),断奶后36h(D36.5)、72h(D38)、7d(D42)、10d(D45),随机选取对照组和处理组仔猪各6头,屠宰采集血样。采用放射免疫分析法测定仔猪血清皮质醇、三碘甲腺厚氨酸(T3)、甲状腺激素(T4)和白细胞介素-2(IL-2)水平。结果表明:(1)对照组血清皮质醇水平在断奶前保持稳定,在D36.5时升高,在D42时恢复至D35水平,随后保持稳定;处理组血清皮质醇水平在D36.5时较D35有升高趋势,在D38时恢复至D35水平,随后保持稳定。对照组血清T3水平在D36.5显著高于D28,其他日龄点间无显著差异,处理组基本保持稳定。对照组血清T4水平在D36.5时升高,在D38日时恢复至D35水平,随后保持稳定;处理组血清T4水平从D35至D45基本保持稳定。两组中血清IL-2水平在D28至D42保持稳定,D45升高。(2)在D36.5时,处理组血清皮质醇水平较对照组降低30%,处理组血清T3水平在D35和D45较对照组提高49.2%和38.6%,T4水平在D35和D45提高31%和45.8%,在其他日龄点,处理组T3、T4水平较对照组有升高趋势,但差异不显著。处理组IL-2水平在D36.5、D38、D45也分别较对照组提高22.1%、12.6%和17.8%,在其他日龄点有升高趋势。以上结果提示半胱胺能抵抗仔猪断奶应激,提高仔猪血清T3、T4水平,增强仔猪的免疫力。  相似文献   

3.
益生菌Lactobacillus amylovorus S1对仔猪后肠菌群的影响   总被引:2,自引:1,他引:1  
苏勇  姚文  朱伟云 《微生物学报》2006,46(6):961-966
结合PCR/DGGE(Denaturinggradientgelelectrophoresis,变性梯度凝胶电泳)和16SrDNA序列分析技术,研究添加益生菌LactobacillusamylovorusS1后仔猪从7至35日龄(断奶后两周)后肠菌群的变化。6窝新生仔猪被随机分成两组:对照组和处理组,处理组仔猪于7、9和11日龄口服L.amylovorusS1菌液(活菌数5×109CFU/mL)。分别于7、14、21、24和35日龄,每窝随机屠宰一头仔猪,收集肠道样品。比较不同日龄仔猪后肠菌群DGGE图谱表明,断奶后图谱中多数高GC含量细菌条带消失,至断奶后两周又逐渐出现。序列分析显示,这些高GC含量细菌主要为乳酸杆菌。统计分析表明,仔猪口服益生菌S1对其盲肠和结肠菌群的多样性指数无显著影响。通过比较处理组和对照组图谱发现,处理组14日龄出现一特异条带,与其匹配的序列的最相似已知菌为Clostridiumdisporicum,相似性为95%;而35日龄对照组有一特异优势条带,该条带被鉴定为猪链球菌(Streptococcussuis),相似性为99%。  相似文献   

4.
目的观察复合活菌制剂对断奶仔猪生长性能及血清溶菌酶含量的影响。方法选择长白二元杂交断奶仔猪90头进行实验,断奶日龄为35 d。共分为5个组,每组设3个重复,每个重复随机选取健康仔猪6头。实验组一:饲喂基础日粮+0.1%复合制剂(纳豆杆菌,双歧杆菌,罗伊乳杆菌),实验组二:饲喂基础日粮+0.1%复合制剂(纳豆杆菌,双歧杆菌,干酪乳杆菌),实验组三:饲喂基础日粮+0.1%复合制剂(纳豆杆菌,双歧杆菌,嗜酸乳杆菌),实验组四:饲喂基础日粮+0.1%复合制剂(纳豆杆菌,双歧杆菌,罗伊乳杆菌,干酪乳杆菌,嗜酸乳杆菌),对照组:饲喂基础日粮。其中复合制剂中益生菌活菌数为109CFU/g。饲养30 d后观察复合活菌制剂对断奶仔猪生长性能及血清溶菌酶含量的影响。结果在日增重、饲料效率及血清溶菌酶方面,实验组一和二显著高于对照组(P0.05);在腹泻率方面,实验组均显著低于对照组(P0.05)。结论在仔猪日粮中添加复合活菌制剂可提高每头断奶仔猪平均日增重及饲料效率,降低腹泻的发病率,且增高仔猪血清溶菌酶含量,提高仔猪的免疫机能,从而提高经济效益。  相似文献   

5.
目的 :研究严重烧伤患者早期红细胞滤过指数 (EFI)与红细胞膜胆固醇含量、Na K ATPase活性的变化。探讨其在严重烧伤早期中的相互关系及意义。方法 :采用核孔滤膜法测定红细胞滤过指数 (EFI) ,用化学修饰电极法测定红细胞膜胆固醇含量 ,应用定磷法测定红细胞膜Na K ATPase活性。结果 :4 7例严重烧伤早期患者EFI较 6 0例正常对照组下降 (P <0 .0 1) ,红细胞膜胆固醇含量、Na K ATPase活性均高于正常对照组 (P <0 .0 1) ,且红细胞膜胆固醇含量、Na K ATPase活性与EFI呈密切负相关 (rcho =- 0 .871,rATPase =- 0 .80 1,P <0 .0 1)。结论 :严重烧伤早期EFI下降 ,变形性明显减低是导致血液粘度和微循环改变的原因之一 ,红细胞膜胆固醇含量和Na K ATPase活性的变化则是引起EFI下降、变形性减低的重要因素  相似文献   

6.
结合PCR/DGGE (Denaturing gradient gel electrophoresis,变性梯度凝胶电泳)和16S rDNA序列分析技术,研究添加益生菌Lactobacillus amylovorus S1后仔猪从7至35日龄(断奶后两周)后肠菌群的变化。6窝新生仔猪被随机分成两组:对照组和处理组,处理组仔猪于7、9和11日龄口服L. amylovorus S1菌液(活菌数5×10.9 CFU/mL)。分别于7、14、21、24和35日龄,每窝随机屠宰一头仔猪,收集肠道样品。比较不同日龄仔猪后肠菌群DGGE图谱表明,断奶后图谱中多数高GC含量细菌条带消失,至断奶后两周又逐渐出现。序列分析显示,这些高GC含量细菌主要为乳酸杆菌。统计分析表明,仔猪口服益生菌S1对其盲肠和结肠菌群的多样性指数无显著影响。通过比较处理组和对照组图谱发现,处理组14日龄出现一特异条带,与其匹配的序列的最相似已知菌为Clostridium disporicum,相似性为95%;而35日龄对照组有一特异优势条带,该条带被鉴定为猪链球菌(Streptococcus suis),相似性为99%。  相似文献   

7.
【目的】研究断奶前给仔猪饲喂植物乳杆菌和干酪乳杆菌对断奶前、后肠道菌群组成、数量和短链脂肪酸(SCFA)浓度的影响,分析仔猪生长性能与肠道形态、微生物菌群及SCFAs的相关性,探讨测试菌株缓解仔猪断奶应激的可能机制。【方法】选取15窝7 d龄杜长大仔猪,随机分为3组,分别灌喂2 mL去离子水(对照组)、0.5×10~9 CFU/mL植物乳杆菌(LP组)或干酪乳杆菌(LC组)的菌液,每组以窝为单位5个重复,于21 d(断奶)、24 d和35 d屠宰,采集回肠和结肠食糜,分析菌群组成和数量的变化,测定SCFAs浓度。【结果】测试菌株均能显著提高断奶2周后回肠、结肠菌群多样性(P0.05),促进乳酸杆菌和双歧杆菌增殖;显著促进断奶前回肠和结肠中乙酸、丙酸、丁酸和总SCFA生成,促进断奶后乙酸和总SCFA产生;相关分析显示,测试菌株组仔猪腹泻率下降与SCFAs浓度上升、回肠绒毛高度增加和总菌数量上升显著相关,日增重提高与结肠乙酸和TSCFA浓度增加显著相关。【结论】测试菌株促进乳酸杆菌、双歧杆菌等有益菌增殖,增加肠道菌群多样性,促进肠道SCFAs生成。  相似文献   

8.
为了探讨发酵中药渣作为饲料添加剂替代饲用抗生素的可行性,选用21日龄断奶仔猪120头,随机分为对照组、中药渣组、发酵中药渣组和抗生素组,比较研究发酵前和发酵后中药渣对其生长性能、腹泻率、消化率和肠黏膜形态结构的影响。结果表明:发酵中药渣组仔猪各阶段的料重比均低于对照组和中药渣组。试验1~7 d、8~28 d和1~28 d,发酵中药渣组仔猪腹泻率与对照组和中药渣组无显著差异;发酵中药渣组各养分消化率均高于其他各组;发酵中药渣组空肠绒毛长度/隐窝深度最小,绒毛宽度最大。上述结果提示,饲粮中添加发酵中药渣可在一定程度上提高断奶仔猪的生长性能和养分消化率,但对仔猪腹泻率和肠道形态结构无显著影响。  相似文献   

9.
BCAA对大鼠LDH、TNF_α、Ca~(2+)-ATPase的影响初探   总被引:1,自引:0,他引:1  
目的 :初步探讨BCAA对大鼠LDH、Ca2 + ATPase、TNFα 的影响。方法 :Wistar鼠 ,随机分为正常对照组、BCAA实验组。正常对照组摄食普通酪蛋白饲料 ,BCAA实验组饲料添加BCAA ,5周后处死动物取标本待测。结果 :BCAA显著增加血中TNFα 水平 ,明显增加骨骼肌LDH活力 ,显著增强心肌和骨骼肌中Ca2 + ATPase活性 ,但不影响血乳酸、肌中LDH活力和心肌及骨骼肌中糖原含量。结论 :BCAA具有调节LDH、Ca2 + ATPase活力 ,促进TNFα 分泌的作用  相似文献   

10.
目的研究雌性小鼠饲喂异黄酮后对其后代雌鼠生殖性状的影响。方法分别在雌鼠从断奶到妊娠前和妊娠期间两个不同阶段的日粮中添加不同剂量的大豆异黄酮(0、50、400 mg/kg)。记录F1代的出生窝产仔数、出生窝重、雌鼠的阴道最早开张时间和最早见栓时间,以及后代雌鼠性成熟期和体成熟期生殖器官重量、血清雌激素的含量。结果雌鼠妊娠期饲喂含50、400 mg/kg大豆异黄酮的饲料后F1代的窝产仔数显著高于对照组(P〈0.05);雌鼠妊娠期采食400 mg/kg大豆异黄酮饲料,其后代雌鼠初次配种时间明显延迟(P〈0.05);45、65日龄体重显著低于对照组,65日龄子宫重显著低于对照组,卵巢重显著高于对照组;血清中雌激素含量显著低于对照组(P〈0.05),妊娠期间采食50 mg/kg大豆异黄酮饲料,其F1代雌鼠仅窝产仔数和45日龄时血清中雌激素含量受到影响;而雌鼠从断奶到怀孕期间饲喂含大豆异黄酮饲料的F1代在各项指标与对照组均差异无显著性。结论雌鼠妊娠期间饲喂含400 mg/kg大豆异黄酮的饲料会显著影响其雌性后代的初情期、生殖器官发育、血清雌激素含量等生殖生理性状,而在非妊娠期饲喂含大豆异黄酮饲料对F1代无显著影响。  相似文献   

11.
Two experiments were conducted to evaluate duodenal gene expression of lactoferrin and effect of weaning age on mRNA expression of lactoferrin in piglets using semi-quantitative RT-PCR analysis. In experiment 1, a total of 15 female Duroc x Landrace x Yorkshire piglets of five groups, each group pigs at 1, 14, 28, 42 and 56 days of age were used to determine developmental gene expression of lactoferrin in duodenum. In experiment 2, a total of 18 female neonatal piglets were divided into three groups, which were weaned at 21, 28 and 35 days of age respectively. In each group, three piglets' duodena were sampled at 21, 28 and 35 days of age and the other three piglets' duodena were sampled 7 days after weaning in each group. The samples were collected for detecting the effect of weaning age on lactoferrin mRNA expression of piglets. The results show that lactoferrin mRNA levels decreased steadily in postnatal day 1-56. But only from day 28-42 (14 days after weaned), the levels of lactoferrin gene expression were decreased markedly (p < 0.05), and the difference of lactoferrin mRNA levels at other stages was not significant. This result suggested that weaning had an effect on gene expression of lactoferrin. The results of experiment 2 showed that when the piglets were weaned at 21-28 and 35 days of age respectively, the expression levels of lactoferrin were decreased by 77%, 53% and 59% at the seventh day after weaning. Our results showed that weaning significantly decreased lactoferrin mRNA expression of piglets.  相似文献   

12.
Resting rat light gastric membranes prepared through 2H2O and Percoll gradient centrifugations were enriched not only with (H+-K+)-ATPase and K+ transport activity (Im, W. B., Blakeman, D. P., and Davis, J. P. (1985) J. Biol. Chem. 260, 9452-9460), but also with a K+-independent, ATP-dependent H+-pumping activity. This intravesicular acidification has been ascribed to an oligomycin-insensitive H+-ATPase which differed from (H+-K+)-ATPase in several respects. The H+-ATPase is electrogenic, apparently of lower capacity, required a lower optimal ATP concentration (4 microM for the H+-ATPase and 500 microM for (H+-K+)-ATPase), of lower sensitivity to vanadate and sulfhydryl agents such as p-chloromercuribenzoate and N-ethylmaleimide, and insensitive to SCH 28,080, a known competitive inhibitor of (H+-K+)-ATPase with respect to K+. Operation of the H+-ATPase, however, appeared to interfere with the K+ transport activity in the light gastric membranes, probably through development of intravesicular positive membrane potential; for example, micromolar levels of Mg2+-ATP fully inhibited K+ uptake and stimulated K+ efflux as measured with 86Rb+. Involvement of (H+-K+)-ATPase in the K+ transport is not likely, since the inhibitory effect of Mg2+-ATP continued even after removal of the nucleotide with an ATP-scavenging system. Moreover, nigericin, an electroneutral H+/K+ exchanger, could bypass the inhibitory effect of Mg2+-ATP and equilibrate the membrane vesicles with 86Rb+ while valinomycin, an electrogenic K+ ionophore, could not. Finally, the H+-ATPase could possibly be involved in the acid secretory process, since its H+-pumping activity was removed from the light gastric membrane fraction upon carbachol treatment, along with the K+ transport and (H+-K+)-ATPase activities. We have speculated that the H+-ATPase is responsible for maintaining the K+-permeable intracellular membrane vesicles acidic and K+ free during the resting state of acid secretion and may contribute to basal acid secretion.  相似文献   

13.
The Na+ -K+ -ATPase enzyme is vital in skeletal muscle function. We investigated the effects of acute high-intensity interval exercise, before and following high-intensity training (HIT), on muscle Na+ -K+ -ATPase maximal activity, content, and isoform mRNA expression and protein abundance. Twelve endurance-trained athletes were tested at baseline, pretrain, and after 3 wk of HIT (posttrain), which comprised seven sessions of 8 x 5-min interval cycling at 80% peak power output. Vastus lateralis muscle was biopsied at rest (baseline) and both at rest and immediately postexercise during the first (pretrain) and seventh (posttrain) training sessions. Muscle was analyzed for Na+ -K+ -ATPase maximal activity (3-O-MFPase), content ([3H]ouabain binding), isoform mRNA expression (RT-PCR), and protein abundance (Western blotting). All baseline-to-pretrain measures were stable. Pretrain, acute exercise decreased 3-O-MFPase activity [12.7% (SD 5.1), P < 0.05], increased alpha1, alpha2, and alpha3 mRNA expression (1.4-, 2.8-, and 3.4-fold, respectively, P < 0.05) with unchanged beta-isoform mRNA or protein abundance of any isoform. In resting muscle, HIT increased (P < 0.05) 3-O-MFPase activity by 5.5% (SD 2.9), and alpha3 and beta3 mRNA expression by 3.0- and 0.5-fold, respectively, with unchanged Na+ -K+ -ATPase content or isoform protein abundance. Posttrain, the acute exercise induced decline in 3-O-MFPase activity and increase in alpha1 and alpha3 mRNA each persisted (P < 0.05); the postexercise 3-O-MFPase activity was also higher after HIT (P < 0.05). Thus HIT augmented Na+ -K+ -ATPase maximal activity despite unchanged total content and isoform protein abundance. Elevated Na+ -K+ -ATPase activity postexercise may contribute to reduced fatigue after training. The Na+ -K+ -ATPase mRNA response to interval exercise of increased alpha- but not beta-mRNA was largely preserved posttrain, suggesting a functional role of alpha mRNA upregulation.  相似文献   

14.
We investigated whether depressed muscle Na(+)-K(+)-ATPase activity with exercise reflected a loss of Na(+)-K(+)-ATPase units, the time course of its recovery postexercise, and whether this depressed activity was related to increased Na(+)-K(+)-ATPase isoform gene expression. Fifteen subjects performed fatiguing, knee extensor exercise at approximately 40% maximal work output per contraction. A vastus lateralis muscle biopsy was taken at rest, fatigue, 3 h, and 24 h postexercise and analyzed for maximal Na(+)-K(+)-ATPase activity via 3-O-methylfluorescein phosphatase (3-O-MFPase) activity, Na(+)-K(+)-ATPase content via [(3)H]ouabain binding sites, and Na(+)-K(+)-ATPase alpha(1)-, alpha(2)-, alpha(3)-, beta(1)-, beta(2)- and beta(3)-isoform mRNA expression by real-time RT-PCR. Exercise [352 (SD 267) s] did not affect [(3)H]ouabain binding sites but decreased 3-O-MFPase activity by 10.7 (SD 8)% (P < 0.05), which had recovered by 3 h postexercise, without further change at 24 h. Exercise elevated alpha(1)-isoform mRNA by 1.5-fold at fatigue (P < 0.05). This increase was inversely correlated with the percent change in 3-O-MFPase activity from rest to fatigue (%Delta3-O-MFPase(rest-fatigue)) (r = -0.60, P < 0.05). The average postexercise (fatigue, 3 h, 24 h) alpha(1)-isoform mRNA was increased 1.4-fold (P < 0.05) and approached a significant inverse correlation with %Delta3-O-MFPase(rest-fatigue) (r = -0.56, P = 0.08). Exercise elevated alpha(2)-isoform mRNA at fatigue 2.5-fold (P < 0.05), which was inversely correlated with %Delta3-O-MFPase(rest-fatigue) (r = -0.60, P = 0.05). The average postexercise alpha(2)-isoform mRNA was increased 2.2-fold (P < 0.05) and was inversely correlated with the %Delta3-O-MFPase(rest-fatigue) (r = -0.68, P < 0.05). Nonsignificant correlations were found between %Delta3-O-MFPase(rest-fatigue) and other isoforms. Thus acute exercise transiently decreased Na(+)-K(+)-ATPase activity, which was correlated with increased Na(+)-K(+)-ATPase gene expression. This suggests a possible signal-transduction role for depressed muscle Na(+)-K(+)-ATPase activity with exercise.  相似文献   

15.
16.
cAMP and dexamethasone are known to modulate Na+ transport in epithelial cells. We investigated whether dibutyryl cAMP (DBcAMP) and dexamethasone modulate the mRNA expression of two key elements of the Na+ transport system in isolated rat alveolar epithelial cells: alpha-, beta-, and gamma-subunits of the epithelial Na+ channel (ENaC) and the alpha1- and beta1-subunits of Na+-K+-ATPase. The cells were treated for up to 48 h with DBcAMP or dexamethasone to assess their long-term impact on the steady-state level of ENaC and Na+-K+-ATPase mRNA. DBcAMP induced a twofold transient increase of alpha-ENaC and alpha1-Na+-K+-ATPase mRNA that peaked after 8 h of treatment. It also upregulated beta- and gamma-ENaC mRNA but not beta1-Na+-K+-ATPase mRNA. Dexamethasone augmented alpha-ENaC mRNA expression 4.4-fold in cells treated for 24 h and also upregulated beta- and gamma-ENaC mRNA. There was a 1.6-fold increase at 8 h of beta1-Na+-K+-ATPase mRNA but no significant modulation of alpha1-Na+-K+-ATPase mRNA expression. Because DBcAMP and dexamethasone did not increase the stability of alpha-ENaC mRNA, we cloned 3.2 kb of the 5' sequences flanking the mouse alpha-ENaC gene to study the impact of DBcAMP and dexamethasone on alpha-ENaC promoter activity. The promoter was able to drive basal expression of the chloramphenicol acetyltransferase (CAT) reporter gene in A549 cells. Dexamethasone increased the activity of the promoter by a factor of 5.9. To complete the study, the physiological effects of DBcAMP and dexamethasone were investigated by measuring transepithelial current in treated and control cells. DBcAMP and dexamethasone modulated transepithelial current with a time course reminiscent of the profile observed for alpha-ENaC mRNA expression. DBcAMP had a greater impact on transepithelial current (2.5-fold increase at 8 h) than dexamethasone (1.8-fold increase at 24 h). These results suggest that modulation of alpha-ENaC and Na+-K+-ATPase gene expression is one of the mechanisms that regulates Na+ transport in alveolar epithelial cells.  相似文献   

17.
The effects of dietary nucleotide supplementation from 9 days of age until the end of post-weaning on piglets hormonal and immune responses and on growth performance were investigated. During lactation (days 9 to 21) and post-weaning (days 22 to 55) 10 [HBI Fomeva11 × (Large White × Landrace)] litters (n = 108 piglets) had ad libitum access to two standard diets, both supplemented with 0% (T0 group) or 0.1% (T1 group) of yeast extract nucleotides. BW of piglets at days 21 (P < 0.10), 35 and 55 (P < 0.05) was greater in T1 compared with T0. Feed intake was not different between groups (P > 0.05). Cortisol content was lower in T1 than in T0 at days 28 and 35 (P < 0.05), whereas growth hormone was lower at day 35 (P < 0.05). Levels of IGF-1 were similar across groups (P > 0.05). Nucleotide-supplemented diets increased lymphocyte subpopulation CD4-CD8+high at days 21 and 35 (P < 0.05), whereas CD4+CD8- cells were higher in T1 than in T0 at day 21 (P < 0.05). Peripheral blood mononuclear cells cytokine expression was influenced by dietary nucleotide supplementation. At weaning, interleukin (IL)-6 and IL-1β expression was lower (P < 0.05) in T1 compared with T0, whereas the expression of interferon (IFN)-γ and IL-10 was higher (P < 0.05). At day 28, piglets in T1 showed higher values of tumor necrosis factor (TNF)-α expression than T0 and lower values of IL-10 expression (P < 0.05). Dietary nucleotide supplementation had a suppressive effect on IL-6 and IL-10 expression (P < 0.05) at day 35. On the contrary, the expression of IFN-γ, TNF-α and IL-1β was enhanced (P < 0.05). In conclusion, these results suggest that starting a dietary nucleotide supplementation before weaning can improve the adaptive capabilities of weaned piglets to the stressors, enhancing the growth performance.  相似文献   

18.
Gastric heavy microsomal membranes highly enriched in (H+-K+)-ATPase were obtained from cimetidine- or carbachol-treated rats through 2H2O and Percoll gradient centrifugations. Both the resting (cimetidine-treated) and the stimulated (carbachol-treated) heavy membranes which presumably represent the apical membrane of gastric parietal cells were enriched with the polypeptides of 81,000 and 45,000 besides that of 93,000 representing (H+-K+)-ATPase. No apparent differences could be detected between the resting and the stimulated heavy membranes in their polypeptide profiles or their specific activity of (H+-K+)-ATPase. Nevertheless, the level of 86RbCl uptake was greater in the stimulated than the resting heavy microsomal membrane vesicles. The light gastric microsomes which abound in intracellular tubulovesicles containing reserve (H+-K+)-ATPase as isolated from cimetidine-treated rats were similarly purified with respect to (H+-K+)-ATPase. The purified light gastric membranes were largely devoid of the polypeptides of 81,000 and 45,000 found in the heavy gastric membranes. These observations further support the current hypothesis that secretagogues bring about changes in the environment of (H+-K+)-ATPase and induce KCl permeability in the apical membrane of the parietal cells, although at present we have been unable to identify the polypeptide(s) responsible for the KCl pathway.  相似文献   

19.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号