Post-traumatic spinal cord remodeling includes both degenerating and regenerating processes,which affect the potency of the functional recovery after spinal cord injury(SCI).Gene therapy for spinal cord injury is prop...Post-traumatic spinal cord remodeling includes both degenerating and regenerating processes,which affect the potency of the functional recovery after spinal cord injury(SCI).Gene therapy for spinal cord injury is proposed as a promising therapeutic strategy to induce positive changes in remodeling of the affected neural tissue.In our previous studies for delivering the therapeutic genes at the site of spinal cord injury,we developed a new approach using an autologous leucoconcentrate transduced ex vivo with chimeric adenoviruses(Ad5/35)carrying recombinant cDNA.In the present study,the efficacy of the intravenous infusion of an autologous genetically-enriched leucoconcentrate simultaneously producing recombinant vascular endothelial growth factor(VEGF),glial cell line-derived neurotrophic factor(GDNF),and neural cell adhesion molecule(NCAM)was evaluated with regard to the molecular and cellular changes in remodeling of the spinal cord tissue at the site of damage in a model of mini-pigs with moderate spinal cord injury.Experimental animals were randomly divided into two groups of 4 pigs each:the therapeutic(infused with the leucoconcentrate simultaneously transduced with a combination of the three chimeric adenoviral vectors Ad5/35‐VEGF165,Ad5/35‐GDNF,and Ad5/35‐NCAM1)and control groups(infused with intact leucoconcentrate).The morphometric and immunofluorescence analysis of the spinal cord regeneration in the rostral and caudal segments according to the epicenter of the injury in the treated animals compared to the control mini-pigs showed:(1)higher sparing of the grey matter and increased survivability of the spinal cord cells(lower number of Caspase-3-positive cells and decreased expression of Hsp27);(2)recovery of synaptophysin expression;(3)prevention of astrogliosis(lower area of glial fibrillary acidic protein-positive astrocytes and ionized calcium binding adaptor molecule 1-positive microglial cells);(4)higher growth rates of regeneratingβIII-tubulin-positive axons accompanied by a higher number of oligodendrocyte transcription factor 2-positive oligodendroglial cells in the lateral corticospinal tract region.These results revealed the efficacy of intravenous infusion of the autologous genetically-enriched leucoconcentrate producing recombinant VEGF,GDNF,and NCAM in the acute phase of spinal cord injury on the positive changes in the post-traumatic remodeling nervous tissue at the site of direct injury.Our data provide a solid platform for a new ex vivo gene therapy for spinal cord injury and will facilitate further translation of regenerative therapies in clinical neurology.展开更多
Background: Pregnancy is associated with important changes in gut microbiota composition. Dietary factors may affect the diversity, composition, and metabolic activity of the intestinal microbiota. Among amino acids, ...Background: Pregnancy is associated with important changes in gut microbiota composition. Dietary factors may affect the diversity, composition, and metabolic activity of the intestinal microbiota. Among amino acids, proline is known to play important roles in protein metabolism and structure, cell differentiation, conceptus growth and development, and gut microbiota re-equilibration in case of dysbiosis.Results: Dietary supplementation with 1% proline decreased(P < 0.05) the amounts of Klebsiella pneumoniae,Peptostreptococcus productus, Pseudomonas, and Veillonella spp. in distal colonic contents than that in the control group. The colonic contents of Butyrivibrio fibrisolvens, Bifidobacterium sp., Clostridium coccoides, Clostridium coccoides-Eubacterium rectale, Clostridium leptum subgroup, Escherichia coli, Faecalibacterium prausnitzii,Fusobacterium prausnitzii, and Prevotella increased(P < 0.05) on d 70 of pregnancy as compared with those on d 45 of pregnancy. The colonic concentrations of acetate, total straight-chain fatty acid, and total short-chain fatty acids(SCFA) in the proline-supplemented group were lower(P < 0.05), and butyrate level(P = 0.06) decreased as compared with the control group. Almost all of the SCFA displayed higher(P < 0.05) concentrations in proximal colonic contents on d 70 of pregnancy than those on d 45 of pregnancy. The concentrations of 1,7-heptyl diamine(P = 0.09) and phenylethylamine(P < 0.05) in proximal colonic contents were higher, while those of spermidine(P = 0.05) and total bioamine(P = 0.06) tended to be lower in the proline-supplemented group than those in the control group. The concentrations of spermidine, spermine, and total bioamine in colonic contents were higher(P < 0.05) on d 70 of pregnancy than those measured on d 45 of pregnancy. In contrast, the concentration of phenylethylamine was lower(P < 0.05) on d 70 than on d 45 of pregnancy.(Continued on next page)(Continued from previous page)Conclusion: These findings indicate that L-proline supplementation modifies both the colonic microbiota composition and the luminal concentrations of several bacterial metabolites. Furthermore, our data show that both the microbiota composition and the concentrations of bacterial metabolites are evolving in the course of pregnancy. These results are discussed in terms of possible implication in terms of luminal environment and consequences for gut physiology and health.展开更多
AIM: to establish a new animal model for the research of human rotavirus(HRV) infection, its pathogenesis and immunity and evaluation of potential vaccines.METHODS: 5-d, 30-d and 60-d-old Chinese mini-pigs, Guizhou an...AIM: to establish a new animal model for the research of human rotavirus(HRV) infection, its pathogenesis and immunity and evaluation of potential vaccines.METHODS: 5-d, 30-d and 60-d-old Chinese mini-pigs, Guizhou and bamma, were inoculated with a single oral dose of attenuated strain Wa, G1, G3 of HRV, and PbS(control), respectively, and fecal samples of pigs from 0 to 7 d post infection(DPI) were collected individually. Enzyme linked immunosorbent assay was used to detect HRV antigen in feces. the HRV was tested by real-time PCR(Rt-PCR). the sections of the intestinal tissue were stained with hematoxylin and eosin to observe the morphologic variation by microscopy. Immunofluorescence was used to determine the HRV in intestinal tissue. HRV particles in cells of the ileum were observed by electron micrography.RESULTS: When inoculated with HRV, mini-pigs younger than 30 d developed diarrhea in an agedependent manner and shed HRV antigen of the sameinoculum, as demonstrated by Rt- PCR.Histopathological changes were observed in HRV inoculated mini-pigs including small intestinal cell tumefaction and necrosis. HRV that was distributed in the small intestine was restricted to the top part of the villi on the internal wall of the ileum, which was observed by immunofluorescence and transmission electron microscopy. Virus particles were observed in Golgi like follicles in HRV-infected neonatal minipigs. Guizhou mini-pigs were more sensitive to HRV than bamma with respect to RV antigen shedding and clinical diarrhea.CONCLUSION: these results indicate that we have established a mini-pig model of HRV induced diarrhea. Our findings are useful for the understanding of the pathogenic mechanisms of HRV infection.展开更多
Background:Currently,increasing attention is being paid to the important role of intestinal microbiome in diabetes.However,few studies have evaluated the characteristics of gut microbiome in diabetic miniature pigs,de...Background:Currently,increasing attention is being paid to the important role of intestinal microbiome in diabetes.However,few studies have evaluated the characteristics of gut microbiome in diabetic miniature pigs,despite it being a good model animal for assessing diabetes.Methods:In this study,a mini-pig diabetes model(DM)was established by 9-month high-fat diet(HFD)combined with lowdose streptozotocin,while the animals fed standard chow diet constituted the control group.16S ribosomal RNA(rRNA)gene sequencing was performed to assess the characteristics of the intestinal microbiome in diabetic mini-pigs.Results:The results showed that microbial structure in diabetic mini-pigs was altered,reflected by increases in levels of Coprococcus_3 and Clostridium_sensu_stricto_1,which were positively correlated with diabetes,and decreases in levels of the bac-teria Rikenellaceae,Clostridiales_vadinBB60_group,and Bacteroidales_RF16_group,which were inversely correlated with blood glucose and insulin resistance.Moreover,PICRUSt-predicted pathways related to the glycolysis and Entner-Doudoroff superpathway,enterobactin biosynthesis,and the L-tryptophan biosynthesis were significantly elevated in the DM group.Conclusion:These results reveal the composition and predictive functions of the intestinal microbiome in the mini-pig diabetes model,further verifying the relationship between HFD,gut microbiome,and diabetes,and providing novel insights into the application of the mini-pig diabetes model in gut microbiome research.展开更多
[ Objective] The research aimed to discuss the relationship between the polymorphism of PPARy.2 gene and the susceptibility of type 2 diabetes mellitus （T2DM） in Guangxi Bama mini-pigs. [ Method] 24 Guangxi Bama min...[ Objective] The research aimed to discuss the relationship between the polymorphism of PPARy.2 gene and the susceptibility of type 2 diabetes mellitus （T2DM） in Guangxi Bama mini-pigs. [ Method] 24 Guangxi Bama mini-pigs were fed with high-fat and high-sucrose diet, and partial sequences of exon 2 of PPARy-2 gene were amplified by using PCR method. In addition, the contents of fasting blood glucose and insulin （INS） in Guangxi Bama mini-pigs were determined, and the glucose tolerance test （GTT） was also carried out. [ Result] There was one SNP site （19813A/G） Jn partial sequence of exon 2 of the cloned PPAFly-2 gene, and AA （7 pigs） and AG （17 pigs） genotype were detected. The contents of fasting insulin and 60-min blood glucose in GTT in AG-genotype Guangxi Bama mini-pigs were significantly higher than those of AA genotype （ P 〈0.05）, while the incidence of T2DM in AG-genotype Guangxi Bama mini-pigs （71.4%） was obviously higher than that of AA gen- otype （5.9%）. [ Conclusion] The polymorphism of 19813A/G in exon 2 of PPARy-2 gene was related with the susceptibility of T2DM in Guangxi Bama mini-pigs.展开更多
The objective of the study is to evaluate and compare the effects of betaine or glycine on carcass trait,meat quality and lipid metabolism of finishing Huan Jiang mini-pigs.Betaine called trimethylglycine is a methyl ...The objective of the study is to evaluate and compare the effects of betaine or glycine on carcass trait,meat quality and lipid metabolism of finishing Huan Jiang mini-pigs.Betaine called trimethylglycine is a methyl derivative of glycine,but few researches were conducted to compare the impact of dietary betaine and glycine on pigs.One hundred and forty-four Huan Jiang mini-pigs(body weight=10.55±0.15 kg;70 d)were randomly divided to 3 treatment groups(basal diet,glycine or betaine).Results indicated that dietary betaine increased the average daily gain(ADG)and final weight(P<0.05).Dietary glycine or betaine markedly reduced average backfat thickness(P<0.05)and heightened lean percentage(P<0.01)compared to the control group.Moreover,in comparison with the control group,betaine significantly improved the redness(a*)and tenderness(shear force)of the longissimus dorsi(LD)muscle(P<0.05),whereas glycine only raised the value of a*of the LD muscle(P<0.05).These results showed that diet supplemented with 0.25%betaine and equimolar amounts of glycine could regulate cascass trait and meat quality of finishing Huan Jiang mini-pigs,and the effect of betaine was superior to that of glycine.展开更多
以间歇性低压低氧方法建立阻塞性睡眠呼吸暂停综合征(Obstructive sleep apnea syndrome,OSAS)小型猪模型.8只小型猪编号后随机分为A、B、C组.A为对照组,置于双室低压氧仓二室,维持海平面压力;B、C组置于双室低压氧仓一室,仓内压力约53....以间歇性低压低氧方法建立阻塞性睡眠呼吸暂停综合征(Obstructive sleep apnea syndrome,OSAS)小型猪模型.8只小型猪编号后随机分为A、B、C组.A为对照组,置于双室低压氧仓二室,维持海平面压力;B、C组置于双室低压氧仓一室,仓内压力约53.9 KPa、氧浓度10%～11.2%.3组每天均入仓6 h.第13 d处死B组,A、C组第23 d同时处死.各组进仓前和处死前均行咽部CT扫描、口咽部呼吸压力、血氧饱和度检查;处死后取咽部组织行病理检查.咽部CT扫描示,咽部舌骨水平咽后壁厚度和侧壁厚度,进仓第13 d(8.8±1.1 vs 6.5±0.6,8.1±0.2 vs 6.3±0.6)和第23 d(9.2±1.2 vs 6.3±0.7,8.9±0.7 vs 6.4±0.5)均较进仓前有增加(P＜0.05).舌骨水平左右径和软腭水平前后径进仓第13 d(7.6±1.4 vs 9.7±1.4,3.8±1.1 vs 6.5±1.3)和第23 d(6.4±1.6 vs9.3±1.5,4.3±0.9 vs 5.9±0.8)均较进仓前减小(P＜0.05).舌骨后区前后径进仓第23 d后较进仓前减小(3.7±0.9 VS 6.4±0.6,P＜0.05).进仓第23d口咽呼吸压力(0.0755 Mv)较进仓前(0.0658 Mv)明显增大(P＜0.05),而第13 d(0.063 Mv)较进仓前变化不明显.血氧饱和度进仓第13 d(87%)和第23 d(88.5%)均较进仓前(96.3%)明显减小(P＜0.05).病理变化:A组:咽部黏膜为复层扁平上皮,黏膜下层薄,肌层横纹清、肌间脂肪少.B组:咽部上皮组织增生伴角化,黏膜下层水肿纤维组织增生,肌层厚横纹不清、肌间脂肪灶性浸润;C组较B组病理变化程度加重.提示:间歇性低压低氧,使小型猪咽腔组织结构和力学特性发生类似OSAS病人的变化,本研究建立的OSAS小型猪模型,能用于人OSAS的进一步研究.展开更多
基金supported by a grant from the Russian Science Foundation,No. 16-15-00010 (to RRI)funded by government assignment for FRC Kazan Scientific Center of RAS
文摘Post-traumatic spinal cord remodeling includes both degenerating and regenerating processes,which affect the potency of the functional recovery after spinal cord injury(SCI).Gene therapy for spinal cord injury is proposed as a promising therapeutic strategy to induce positive changes in remodeling of the affected neural tissue.In our previous studies for delivering the therapeutic genes at the site of spinal cord injury,we developed a new approach using an autologous leucoconcentrate transduced ex vivo with chimeric adenoviruses(Ad5/35)carrying recombinant cDNA.In the present study,the efficacy of the intravenous infusion of an autologous genetically-enriched leucoconcentrate simultaneously producing recombinant vascular endothelial growth factor(VEGF),glial cell line-derived neurotrophic factor(GDNF),and neural cell adhesion molecule(NCAM)was evaluated with regard to the molecular and cellular changes in remodeling of the spinal cord tissue at the site of damage in a model of mini-pigs with moderate spinal cord injury.Experimental animals were randomly divided into two groups of 4 pigs each:the therapeutic(infused with the leucoconcentrate simultaneously transduced with a combination of the three chimeric adenoviral vectors Ad5/35‐VEGF165,Ad5/35‐GDNF,and Ad5/35‐NCAM1)and control groups(infused with intact leucoconcentrate).The morphometric and immunofluorescence analysis of the spinal cord regeneration in the rostral and caudal segments according to the epicenter of the injury in the treated animals compared to the control mini-pigs showed:(1)higher sparing of the grey matter and increased survivability of the spinal cord cells(lower number of Caspase-3-positive cells and decreased expression of Hsp27);(2)recovery of synaptophysin expression;(3)prevention of astrogliosis(lower area of glial fibrillary acidic protein-positive astrocytes and ionized calcium binding adaptor molecule 1-positive microglial cells);(4)higher growth rates of regeneratingβIII-tubulin-positive axons accompanied by a higher number of oligodendrocyte transcription factor 2-positive oligodendroglial cells in the lateral corticospinal tract region.These results revealed the efficacy of intravenous infusion of the autologous genetically-enriched leucoconcentrate producing recombinant VEGF,GDNF,and NCAM in the acute phase of spinal cord injury on the positive changes in the post-traumatic remodeling nervous tissue at the site of direct injury.Our data provide a solid platform for a new ex vivo gene therapy for spinal cord injury and will facilitate further translation of regenerative therapies in clinical neurology.
基金jointly supported by grants from the National Nature Science Foundation of China(31572421 and 31270044)National Key R&D Program(2017YFD0500503)“Western Light”key program for Talent Cultivation from Chinese Academy of Sciences,and Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(F.Blachier,2013T2S0014)
文摘Background: Pregnancy is associated with important changes in gut microbiota composition. Dietary factors may affect the diversity, composition, and metabolic activity of the intestinal microbiota. Among amino acids, proline is known to play important roles in protein metabolism and structure, cell differentiation, conceptus growth and development, and gut microbiota re-equilibration in case of dysbiosis.Results: Dietary supplementation with 1% proline decreased(P < 0.05) the amounts of Klebsiella pneumoniae,Peptostreptococcus productus, Pseudomonas, and Veillonella spp. in distal colonic contents than that in the control group. The colonic contents of Butyrivibrio fibrisolvens, Bifidobacterium sp., Clostridium coccoides, Clostridium coccoides-Eubacterium rectale, Clostridium leptum subgroup, Escherichia coli, Faecalibacterium prausnitzii,Fusobacterium prausnitzii, and Prevotella increased(P < 0.05) on d 70 of pregnancy as compared with those on d 45 of pregnancy. The colonic concentrations of acetate, total straight-chain fatty acid, and total short-chain fatty acids(SCFA) in the proline-supplemented group were lower(P < 0.05), and butyrate level(P = 0.06) decreased as compared with the control group. Almost all of the SCFA displayed higher(P < 0.05) concentrations in proximal colonic contents on d 70 of pregnancy than those on d 45 of pregnancy. The concentrations of 1,7-heptyl diamine(P = 0.09) and phenylethylamine(P < 0.05) in proximal colonic contents were higher, while those of spermidine(P = 0.05) and total bioamine(P = 0.06) tended to be lower in the proline-supplemented group than those in the control group. The concentrations of spermidine, spermine, and total bioamine in colonic contents were higher(P < 0.05) on d 70 of pregnancy than those measured on d 45 of pregnancy. In contrast, the concentration of phenylethylamine was lower(P < 0.05) on d 70 than on d 45 of pregnancy.(Continued on next page)(Continued from previous page)Conclusion: These findings indicate that L-proline supplementation modifies both the colonic microbiota composition and the luminal concentrations of several bacterial metabolites. Furthermore, our data show that both the microbiota composition and the concentrations of bacterial metabolites are evolving in the course of pregnancy. These results are discussed in terms of possible implication in terms of luminal environment and consequences for gut physiology and health.
基金Supported by National Natural Science Foundation of China,No.30400402 and No.30571708
文摘AIM: to establish a new animal model for the research of human rotavirus(HRV) infection, its pathogenesis and immunity and evaluation of potential vaccines.METHODS: 5-d, 30-d and 60-d-old Chinese mini-pigs, Guizhou and bamma, were inoculated with a single oral dose of attenuated strain Wa, G1, G3 of HRV, and PbS(control), respectively, and fecal samples of pigs from 0 to 7 d post infection(DPI) were collected individually. Enzyme linked immunosorbent assay was used to detect HRV antigen in feces. the HRV was tested by real-time PCR(Rt-PCR). the sections of the intestinal tissue were stained with hematoxylin and eosin to observe the morphologic variation by microscopy. Immunofluorescence was used to determine the HRV in intestinal tissue. HRV particles in cells of the ileum were observed by electron micrography.RESULTS: When inoculated with HRV, mini-pigs younger than 30 d developed diarrhea in an agedependent manner and shed HRV antigen of the sameinoculum, as demonstrated by Rt- PCR.Histopathological changes were observed in HRV inoculated mini-pigs including small intestinal cell tumefaction and necrosis. HRV that was distributed in the small intestine was restricted to the top part of the villi on the internal wall of the ileum, which was observed by immunofluorescence and transmission electron microscopy. Virus particles were observed in Golgi like follicles in HRV-infected neonatal minipigs. Guizhou mini-pigs were more sensitive to HRV than bamma with respect to RV antigen shedding and clinical diarrhea.CONCLUSION: these results indicate that we have established a mini-pig model of HRV induced diarrhea. Our findings are useful for the understanding of the pathogenic mechanisms of HRV infection.
基金National Natural Science Foundation of China,Grant/Award Number:31802021。
文摘Background:Currently,increasing attention is being paid to the important role of intestinal microbiome in diabetes.However,few studies have evaluated the characteristics of gut microbiome in diabetic miniature pigs,despite it being a good model animal for assessing diabetes.Methods:In this study,a mini-pig diabetes model(DM)was established by 9-month high-fat diet(HFD)combined with lowdose streptozotocin,while the animals fed standard chow diet constituted the control group.16S ribosomal RNA(rRNA)gene sequencing was performed to assess the characteristics of the intestinal microbiome in diabetic mini-pigs.Results:The results showed that microbial structure in diabetic mini-pigs was altered,reflected by increases in levels of Coprococcus_3 and Clostridium_sensu_stricto_1,which were positively correlated with diabetes,and decreases in levels of the bac-teria Rikenellaceae,Clostridiales_vadinBB60_group,and Bacteroidales_RF16_group,which were inversely correlated with blood glucose and insulin resistance.Moreover,PICRUSt-predicted pathways related to the glycolysis and Entner-Doudoroff superpathway,enterobactin biosynthesis,and the L-tryptophan biosynthesis were significantly elevated in the DM group.Conclusion:These results reveal the composition and predictive functions of the intestinal microbiome in the mini-pig diabetes model,further verifying the relationship between HFD,gut microbiome,and diabetes,and providing novel insights into the application of the mini-pig diabetes model in gut microbiome research.
基金funded by the Project of Guangxi Science and Technology Basic Condition Platform Construction (11-31-09)
文摘[ Objective] The research aimed to discuss the relationship between the polymorphism of PPARy.2 gene and the susceptibility of type 2 diabetes mellitus （T2DM） in Guangxi Bama mini-pigs. [ Method] 24 Guangxi Bama mini-pigs were fed with high-fat and high-sucrose diet, and partial sequences of exon 2 of PPARy-2 gene were amplified by using PCR method. In addition, the contents of fasting blood glucose and insulin （INS） in Guangxi Bama mini-pigs were determined, and the glucose tolerance test （GTT） was also carried out. [ Result] There was one SNP site （19813A/G） Jn partial sequence of exon 2 of the cloned PPAFly-2 gene, and AA （7 pigs） and AG （17 pigs） genotype were detected. The contents of fasting insulin and 60-min blood glucose in GTT in AG-genotype Guangxi Bama mini-pigs were significantly higher than those of AA genotype （ P 〈0.05）, while the incidence of T2DM in AG-genotype Guangxi Bama mini-pigs （71.4%） was obviously higher than that of AA gen- otype （5.9%）. [ Conclusion] The polymorphism of 19813A/G in exon 2 of PPARy-2 gene was related with the susceptibility of T2DM in Guangxi Bama mini-pigs.
基金the National Key R&D Program(2018YFD0500405)the National Nature Science Foundation of China(31972582,U19A2037)+7 种基金the Changsha Natural Science Funds for Distinguished Young Scholar(kq2009020)Special funds for the construction of innovative provinces in Hunan Project(2019NK2193,2019RS3022)Open Fund of Key Laboratory of Agro-ecological Processes in Subtropical Region,Chinese Academy of Sciences(ISA2020203)the‘Strategic Priority Research Program’of the Chinese Academy of Sciences(XDA24030204)the Science and technology projects of Changsha City(kq1801059)Hunan Province Key Laboratory of Animal Nutritional Physiology and Metabolic Process(2018TP1031)the General Program of National Natural Science Foundation of China(31872985)the Earmarked Fund for China Agriculture Research System(CARS-35).
文摘The objective of the study is to evaluate and compare the effects of betaine or glycine on carcass trait,meat quality and lipid metabolism of finishing Huan Jiang mini-pigs.Betaine called trimethylglycine is a methyl derivative of glycine,but few researches were conducted to compare the impact of dietary betaine and glycine on pigs.One hundred and forty-four Huan Jiang mini-pigs(body weight=10.55±0.15 kg;70 d)were randomly divided to 3 treatment groups(basal diet,glycine or betaine).Results indicated that dietary betaine increased the average daily gain(ADG)and final weight(P<0.05).Dietary glycine or betaine markedly reduced average backfat thickness(P<0.05)and heightened lean percentage(P<0.01)compared to the control group.Moreover,in comparison with the control group,betaine significantly improved the redness(a*)and tenderness(shear force)of the longissimus dorsi(LD)muscle(P<0.05),whereas glycine only raised the value of a*of the LD muscle(P<0.05).These results showed that diet supplemented with 0.25%betaine and equimolar amounts of glycine could regulate cascass trait and meat quality of finishing Huan Jiang mini-pigs,and the effect of betaine was superior to that of glycine.
文摘以间歇性低压低氧方法建立阻塞性睡眠呼吸暂停综合征(Obstructive sleep apnea syndrome,OSAS)小型猪模型.8只小型猪编号后随机分为A、B、C组.A为对照组,置于双室低压氧仓二室,维持海平面压力;B、C组置于双室低压氧仓一室,仓内压力约53.9 KPa、氧浓度10%～11.2%.3组每天均入仓6 h.第13 d处死B组,A、C组第23 d同时处死.各组进仓前和处死前均行咽部CT扫描、口咽部呼吸压力、血氧饱和度检查;处死后取咽部组织行病理检查.咽部CT扫描示,咽部舌骨水平咽后壁厚度和侧壁厚度,进仓第13 d(8.8±1.1 vs 6.5±0.6,8.1±0.2 vs 6.3±0.6)和第23 d(9.2±1.2 vs 6.3±0.7,8.9±0.7 vs 6.4±0.5)均较进仓前有增加(P＜0.05).舌骨水平左右径和软腭水平前后径进仓第13 d(7.6±1.4 vs 9.7±1.4,3.8±1.1 vs 6.5±1.3)和第23 d(6.4±1.6 vs9.3±1.5,4.3±0.9 vs 5.9±0.8)均较进仓前减小(P＜0.05).舌骨后区前后径进仓第23 d后较进仓前减小(3.7±0.9 VS 6.4±0.6,P＜0.05).进仓第23d口咽呼吸压力(0.0755 Mv)较进仓前(0.0658 Mv)明显增大(P＜0.05),而第13 d(0.063 Mv)较进仓前变化不明显.血氧饱和度进仓第13 d(87%)和第23 d(88.5%)均较进仓前(96.3%)明显减小(P＜0.05).病理变化:A组:咽部黏膜为复层扁平上皮,黏膜下层薄,肌层横纹清、肌间脂肪少.B组:咽部上皮组织增生伴角化,黏膜下层水肿纤维组织增生,肌层厚横纹不清、肌间脂肪灶性浸润;C组较B组病理变化程度加重.提示:间歇性低压低氧,使小型猪咽腔组织结构和力学特性发生类似OSAS病人的变化,本研究建立的OSAS小型猪模型,能用于人OSAS的进一步研究.
