Objective： To construct a recombinant adenovirus vector-carrying human growth and differentiation factor-5 （GDF-5） gene, investigate the biological effects of adenovirus-mediated GDF-5 （Ad-GDF-5） on extracellular...Objective： To construct a recombinant adenovirus vector-carrying human growth and differentiation factor-5 （GDF-5） gene, investigate the biological effects of adenovirus-mediated GDF-5 （Ad-GDF-5） on extracellular matrix （ECM） expression in human degenerative disc nucleus pulposus （NP） cells, and explore a candidate gene therapy method for intervertebral disc degeneration （IDD）. Methods： Human NP cells of a degenerative disc were isolated, cultured, and infected with Ad-GDF-5 using the AdEasy-1 adenovirus vector system. On Days 3, 7, 14, and 21, the contents of the sulfated glycosaminoglycan （sGAG）, deoxyribonucleic acid （DNA） and hydroxyproline （Hyp）, synthesis of proteoglycan and collagen II, gene expression of collagen II and aggrecan, and NP cell proliferation were assessed. Results： The adenovirus was an effective vehicle for gene delivery with prolonged expression of GDF-5. Biochemical analysis revealed increased sGAG and Hyp contents in human NP cells infected by Ad-GDF-5 whereas there was no conspicuous change in basal medium （BM） or Ad-green fluorescent protein （GFP） groups. Only cells in the Ad-GDF-5 group promoted the production of ECM, as demonstrated by the secretion of proteoglycan and up-regulation of collagen II and aggrecan at both protein and mRNA levels. The NP cell proliferation was significantly promoted. Conclusions： The data suggest that Ad-GDF-5 gene therapy is a potential treatment for IDD, which restores the functions of degenerative intervertebral disc through enhancing the ECM production of human NP ceils.展开更多
Objective The current study was aimed to investigate the correlations between immobility time in the forced swimming test （FST, a behavioral indicator of stress level） and hippocampal monoamine levels （markers of d...Objective The current study was aimed to investigate the correlations between immobility time in the forced swimming test （FST, a behavioral indicator of stress level） and hippocampal monoamine levels （markers of depression）, plasma adrenalin level （a peripheral marker of stress） as well as fluoro-jade C staining （a marker of neurodegeneration）. Methods Male Sprague-Dawley rats were subjected to acute, sub-chronic （7 d） or chronic （14 d） FSTs and immobility time was recorded. Levels of noradrenalin, serotonin and dopamine in the hippocampus, and adrenalin level in the plasma were quantified by high-performance liquid chromatography with electrochemical detection. Brain sections from rats after chronic forced swimming or rotenone treatment （3 mg/kg subcutaneously for 4 d） were stained with fluoro-jade C. Results The rats subjected to swimming stress （acute, sub-chronic and chronic） showed long immobility times [（214 ± 5）, （220 ± 4） and （231 ± 7） s, respectively], indicating that the animals were under stress. However, the rats did not exhibit significant declines in hippocampal monoamine levels, and the plasma adrenalin level was not significantly increased compared to that in unstressed rats. The rats that underwent chronic swimming stress did not manifest fluoro-jade C staining in brain sections, while degenerating neurons were evident after rotenone treatment. Conclusion The immobility time in the FST does not correlate with markers of depression （monoamine levels） and internal stress （adrenalin levels and neurodegeneration）, hence this parameter may not be a true indicator of stress level.展开更多
This paper deals with the simple additive degradation models with single random effect. The authors further study the link between the aging property of the implied lifetime and that of the random variation. It is fou...This paper deals with the simple additive degradation models with single random effect. The authors further study the link between the aging property of the implied lifetime and that of the random variation. It is found that both the aging property of the random variation and the analytical behavior of the mean degradation path influence the aging behavior of the implied lifetime.展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.81171472 and 81201407)the Innovation Team Project of Sichuan Provincial Education Department(No.13TD0030)+1 种基金the Major Transformation Cultivation Project of Sichuan Provincial Education Department(No.15CZ0021)the Science and Technology Project of Nanchong City(No.14A0021),China
文摘Objective： To construct a recombinant adenovirus vector-carrying human growth and differentiation factor-5 （GDF-5） gene, investigate the biological effects of adenovirus-mediated GDF-5 （Ad-GDF-5） on extracellular matrix （ECM） expression in human degenerative disc nucleus pulposus （NP） cells, and explore a candidate gene therapy method for intervertebral disc degeneration （IDD）. Methods： Human NP cells of a degenerative disc were isolated, cultured, and infected with Ad-GDF-5 using the AdEasy-1 adenovirus vector system. On Days 3, 7, 14, and 21, the contents of the sulfated glycosaminoglycan （sGAG）, deoxyribonucleic acid （DNA） and hydroxyproline （Hyp）, synthesis of proteoglycan and collagen II, gene expression of collagen II and aggrecan, and NP cell proliferation were assessed. Results： The adenovirus was an effective vehicle for gene delivery with prolonged expression of GDF-5. Biochemical analysis revealed increased sGAG and Hyp contents in human NP cells infected by Ad-GDF-5 whereas there was no conspicuous change in basal medium （BM） or Ad-green fluorescent protein （GFP） groups. Only cells in the Ad-GDF-5 group promoted the production of ECM, as demonstrated by the secretion of proteoglycan and up-regulation of collagen II and aggrecan at both protein and mRNA levels. The NP cell proliferation was significantly promoted. Conclusions： The data suggest that Ad-GDF-5 gene therapy is a potential treatment for IDD, which restores the functions of degenerative intervertebral disc through enhancing the ECM production of human NP ceils.
文摘Objective The current study was aimed to investigate the correlations between immobility time in the forced swimming test （FST, a behavioral indicator of stress level） and hippocampal monoamine levels （markers of depression）, plasma adrenalin level （a peripheral marker of stress） as well as fluoro-jade C staining （a marker of neurodegeneration）. Methods Male Sprague-Dawley rats were subjected to acute, sub-chronic （7 d） or chronic （14 d） FSTs and immobility time was recorded. Levels of noradrenalin, serotonin and dopamine in the hippocampus, and adrenalin level in the plasma were quantified by high-performance liquid chromatography with electrochemical detection. Brain sections from rats after chronic forced swimming or rotenone treatment （3 mg/kg subcutaneously for 4 d） were stained with fluoro-jade C. Results The rats subjected to swimming stress （acute, sub-chronic and chronic） showed long immobility times [（214 ± 5）, （220 ± 4） and （231 ± 7） s, respectively], indicating that the animals were under stress. However, the rats did not exhibit significant declines in hippocampal monoamine levels, and the plasma adrenalin level was not significantly increased compared to that in unstressed rats. The rats that underwent chronic swimming stress did not manifest fluoro-jade C staining in brain sections, while degenerating neurons were evident after rotenone treatment. Conclusion The immobility time in the FST does not correlate with markers of depression （monoamine levels） and internal stress （adrenalin levels and neurodegeneration）, hence this parameter may not be a true indicator of stress level.
基金supported by National Natural Science Foundation of China under Grant No.10771090
文摘This paper deals with the simple additive degradation models with single random effect. The authors further study the link between the aging property of the implied lifetime and that of the random variation. It is found that both the aging property of the random variation and the analytical behavior of the mean degradation path influence the aging behavior of the implied lifetime.
