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ABSTRACT: BACKGROUND: Various tissue engineering strategies have been developed to facilitate axonal regeneration after spinal cord injury. This study aimed to investigate whether neural stem cells (NSCs) could survive in poly(L-lactic-co-glycolic acid) (PLGA) scaffolds and, when cografted with Schwann cells (SCs), could be induced to differentiate towards neurons which form synaptic connection and eventually facilitate axonal regeneration and myelination and motor function. METHODS: NSCs and SCs which were seeded within the directional PLGA scaffolds were implanted in hemisected adult rat spinal cord. Control rats were similarly injured and implanted of scaffolds with or without NSCs. Survival, migration, differentiation, synaptic formation of NSCs, axonal regeneration and myelination and motor function were analyzed. Student's t test was used to determine differences in surviving percentage of NSCs. One-way analysis of variance (ANOVA) was used to determine the differences in the number of axons myelinated in the scaffolds, the mean latency and amplitude of cortical motor evoked potentials (CMEPs) and Basso, Beattie & Bresnahan locomotor rating scale (BBB) score. The χ(2) test was used to determine the differences in recovery percentage of CMEPs. RESULTS: NSCs survived, but the majority migrated into adjacent host cord and died mostly. Survival rate of NSCs with SCs was higher than that of NSCs without SCs ((1.7831 ± 0.0402)% vs. (1.4911 ± 0.0313)%, P < 0.001). Cografted with SCs, NSCs were induced to differentiate towards neurons and might form synaptic connection. The mean number of myelinated axons in PLGA + NSCs + SCs group was more than that in PLGA + NSCs group and in PLGA group ((110.25 ± 30.46) vs. (18.25 ± 3.30) and (11.25 ± 5.54), P < 0.01). The percentage of CMEPs recovery in PLGA + NSCs + SCs group was higher than in the other groups (84.8% vs. 50.0% and 37.5%, P < 0.05). The amplitude of CMEPs in PLGA + NSCs + SCs group was higher than in the other groups ((1452.63 ± 331.70) µV vs. (428.84 ± 193.01) µV and (117.33 ± 14.40) µV, P < 0.05). Ipsilateral retransection resulted in disappearance again and functional loss of CMEPs for a few days. But contralateral retransection completely damaged the bilateral motor function. CONCLUSIONS: NSCs can survive in PLGA scaffolds, and SCs promote NSCs to survive and differentiate towards neurons in vivo which even might form synaptic connection. The scaffolds seeded with cells facilitate axonal regeneration and myelination and motor function recovery. But regenerating axons have limited contribution to motor function recovery.
Chinese medical journal 03/2013; 126(5):909-917. · 0.86 Impact Factor
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ABSTRACT: To evaluate the functional outcomes of patients who underwent total or near total glossectomy with pectoralis major myocutaneous flap (PMMF) or free flap (FF) reconstruction.
Retrospective study of 38 consecutive patients undergoing total or near total glossectomy with PMMF or FF reconstruction. The outcomes of decannulation, feeding and speech function recovery were compared.
Near total glossectomy was performed in 33 patients and total glossectomy was performed in 5 patients. Twenty five patients underwent reconstruction with PMMF including 2 salvage reconstructions after free flaps failure. All PMMFs survived except one complete necrosis. The success rate of PMMF was 96.0% (24/25). Fifteen patients underwent reconstruction with FF. Two flaps developed complete necrosis and the success rate of FF was 86.7% (13/15). The difference in the rates between the two groups was not significant (P=0.545). In the PMMF and FF groups, the renewal of oral feeding were 65.2% (15/23) and 100% (13/13), P<0.05, and the tracheostomy decannulation were 52.2% (12/23) and 100% (12/12), P<0.05, respectively. Postoperative feeding function recovery was better in FF group than that in PMMF group (P=0.011). Single factor analysis showed that using FF and maintaining the continuity of the mandible were related to successful rate of renewal of oral feeding. Multivariate Logistic regression analysis showed that the continuity of the mandible was the only independent predictor for renewal of oral feeding. There was no significant difference in the postoperative speech functions between the two groups.
The continuity of the mandible is the major factor to restore the functional outcomes in feeding after total or near total glossectomy. Compared with PMMF, using FF is more beneficial to retain or rebuild the continuity of the mandible.
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery 10/2011; 46(10):830-5.
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ABSTRACT: To evaluate the efficacy of the distinct free flaps in reconstruction of different types of maxillectomy defects.
A retrospective reviews was performed of in 66 consecutive cases of reconstructions with free flaps for maxillary tumor ablation defects from October 1997 to June 2010. There were 43 patients who had recurrences after previous operations and 46 patients had accepted radiation therapy before. According to the classification of Brown's maxilla defect:10 cases were in class I, 13 in class II, 23 in class III and 20 in class IV. The reconstructive free flaps included 26 fibula flaps, 10 radial forearm flaps, 7 latissimus dorsi flaps, 7 rectus abdominis flaps, 7 anterolateral thigh perforator flaps, 5 deep inferior epigastric artery perforators, 2 latissimus dorsi/rib flaps and 2 iliac crest flaps. Postoperative features and functions were assessed in 29 patients.
The overall free flap success rate was 93.9% (62/66). Three rectus abdominis flaps and one fibula flap failed. There were 29 patients who received postoperative function assessment. Sixty-two percent of the patients restored to taking regular diets, 24 (82.8%) patients had normal language communication ability, and 25 (86.2%) patients were satisfied with their feature.
Radial forearm flap was recommended to reconstruct the class 1 defect, fibula flap to class 2 or class 3 and preformatted flap to class 4.
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery 05/2011; 46(5):368-72.
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ABSTRACT: To investigate the results of reconstruction of hypopharyngeal circumferential and cervical esophageal defects with free jejunal transfer.
Retrospective review of 112 patients who underwent pharyngoesophageal reconstruction with free jejunal interposition. Analysis was confined to the patients with advanced hypopharyngeal, esophageal or recurrent laryngeal squamous cell cancer. Kaplan-Meier method was used to identify the accumulative survival rate.
The free jejunal success rate was 94.6% (106/112). The pharyngocutaneous fistula rate and anastomoses narrow rate were 8.9% (10/112) and 12.5% (12/96) respectively. The perioperative mortality rate was 1.8% (2/112). Except 1 case of dead, 6 cases with flap failure and 2 cases with laryngeal preservation, other 103 cases had resumed oral feeding.
The success rate of free jejunal transplantation is high and free jejunal interposition is an ideal reconstruction method for patients who have hypopharyngeal circumferential and cervical esophageal defects after tumor resection.
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery 05/2011; 46(5):373-7.
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De-Zhi Li,
Yu-Sheng Chen,
Jing-Ping Yang,
Wei Zhang,
Cheng-Ping Hu,
Jia-Shu Li,
Lan Mu,
Ying-Hui Hu,
Rong Geng,
Ke Hu, [......],
Qiu-Yue Wang,
Li-Ping Wei,
Juan DU,
Qin Yu,
Xiao-Ning Zhong,
Rui-Qin Wang,
Jian-Jun Ma,
Gui-Zhen Tian,
Si-Qin Wang,
Zhan-Cheng Gao
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ABSTRACT: Staphylococcus aureus (S. aureus) remains as an important microbial pathogen resulting in community and nosocomial acquired infections with significant morbidity and mortality. Few reports for S. aureus in lower respiratory tract infections (LRTIs) have been documented. The aim of this study was to explore the molecular epidemiology of S. aureus in LRTIs in China.
A multicenter study of the molecular epidemiology of S. aureus in LRTIs was conducted in 21 hospitals in Beijing, Shanghai and twelve other provinces from November 2007 to February 2009. All the collected S. aureus strains were classified as minimum inhibitory concentration (MIC), mecA gene, virulence genes Panton-Valentine Leukocidin (PVL) and γ-hemolysin (hlg), staphylococcal cassette chromosome mec (SCCmec) type, agr type, and Multilocus Sequence Typing (MLST).
Totally, nine methicillin-sensitive S. aureus (MSSA) and 29 methicillin-resistant S. aureus (MRSA) strains were isolated after culture from a total of 2829 sputums or bronchoalveolar lavages. The majority of MRSA strains (22/29) had a MIC value of ≥ 512 µg/ml for cefoxitin. The mecA gene acting as the conservative gene was carried by all MRSA strains. PVL genes were detected in only one S. aureus strain (2.63%, 1/38). The hlg gene was detected in almost the all S. aureus (100% in MSSA and 96.56% in MRSA strains). About 75.86% of MRSA strains carried SCCmec III. Agr type 1 was predominant (78.95%) among the identified three agr types (agr types 1, 2, and 3). Totally, ten sequence type (ST) of S. aureus strains were detected. A new sequence type (ST1445) was found besides confirming ST239 as the major sequence type (60.53%). A dendrogram generated from our own MLST database showed all the bootstrap values ≤ 50%.
Our preliminary epidemiology data show SCCmec III, ST239 and agr type 1 of S. aureus as the predominant strains in LRTIs in Mainland of China.
Chinese medical journal 03/2011; 124(5):687-92. · 0.86 Impact Factor
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Ning Dai, De-zhi Li,
Ji-chao Chen,
Yu-sheng Chen,
Rong Geng,
Ying-hui Hu,
Jing-ping Yang,
Juan DU,
Cheng-ping Hu,
Wei Zhang, [......],
Qiu-yue Wang,
Ke Hu,
Gui-zhen Tian,
Shao-xi Cai,
Rui-qin Wang,
Bei He,
Si-qin Wang,
Zhan-wei Wang,
Su-rui Zhao,
Zhan-cheng Gao
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ABSTRACT: Acinetobacter baumanii (A. baumanii ) remains an important microbial pathogen resulting in nosocomial acquired infections with significant morbidity and mortality. The mechanism by which nosocomial bacteria, like A. baumanii, attain multidrug resistance to antibiotics is of considerable interest. The aim in this study was to investigate the spread status of antibiotic resistance genes, such as multiple β-lactamase genes and aminoglycoside-modifying enzyme genes, from A. baumanii strains isolated from patients with lower respiratory tract infections (LRTIs).
Two thousand six hundred and ninety-eight sputum or the bronchoalveolar lavage samples from inpatients with LRTIs were collected in 21 hospitals in the mainland of China from November 2007 to February 2009. All samples were routinely inoculated. The isolated bacterial strains and their susceptibility were analyzed via VITEK-2 expert system. Several kinds of antibiotic resistant genes were further differentiated via polymerase chain reaction and sequencing methods.
Totally, 39 A. baumanii strains were isolated from 2698 sputum or bronchoalveolar lavage samples. There was not only a high resistant rate of the isolated A. baumanii strains to ampicillin and first- and second-generation cephalosporins (94.87%, 100% and 97.44%, respectively), but also to the third-generation cephalosporins (ceftriaxone at 92.31%, ceftazidine at 51.28%) and imipenem (43.59%) as well. The lowest antibiotic resistance rate of 20.51% was found to amikacin. The OXA-23 gene was identified in 17 strains of A. baumanii, and the AmpC gene in 23 strains. The TEM-1 gene was carried in 15 strains. PER-1 and SHV-2 genes were detected in two different strains. Aminoglycoside-modifying enzyme gene aac-3-Ia was found in 23 strains, and the aac-6'-Ib gene in 19 strains. aac-3-Ia and aac-6'-Ib genes hibernated in three A. baumanii strains that showed no drug-resistant phenotype.
A. baumanii can carry multiple drug-resistant genes at the same time and result in multi-drug resistance. Aminoglycoside-modifying enzyme genes could be hibernating in aminoglycoside sensitive strains without expressing their phenotype.
Chinese medical journal 09/2010; 123(18):2571-5. · 0.86 Impact Factor
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Yi-hong Xiong,
Rui Deng,
Rong-rong Fu, De-zhi Li,
Jie Chen,
Yu-sheng Chen,
Cheng-ping Hu,
Jia-shu Li,
Rui-qin Wang,
Li-ping Wei,
Xiao-ning Zhong,
Gui-zhen Tian,
Lan Mu,
Huan-ying Wan,
Qin Yu,
Pei He,
Jian-jun Ma,
Zhan-cheng Gao
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ABSTRACT: To investigate the current status of atypical pathogen associated infections in community-acquired pneumonia (CAP) in adults, and their clinical attributes.
Clinical data, sputum specimens from acute phase, and paired sera from acute- and convalescent-phases of CAP in 153 adult patients were collected from May 2005 to May 2008 in multiple medical centers. Chlamydia pneumoniae (Cpn) IgG antibody, and Legionella pneumophila (LP) mixed IgG, IgA and IgM antibodies were determined by indirect immuno-fluorescent assay. Mycoplasma pneumoniae (Mpn) mixed IgG, IgA and IgM antibodies were determined by passive agglutination assay. All the sputum specimens were routinely cultured for bacterial isolation.
Fifty-two (34%) out of the 153 cases were diagnosed as atypical CAP per the paired serum-antibody assay. Forty-seven of the 52 atypical CAP cases were infected by one atypical pathogen, 38 with Cpn, 4 with Mpn, and 5 with LP, while 5 out of the 52 atypical CAP cases were infected by 2 pathogens, Cpn and Mpnin 2, Cpn and LP in 3 cases. Eleven cases (21.2%) out of the 52 patients with atypical pneumonia were complicated with bacterial infection. Except peripheral white blood count was significant increased in the group of typical (bacterial only) pneumonia (WBC > 10 × 10⁹)/L, P = 0.03), all the other clinical parameters did not show statistically significant difference between the typical and the atypical pneumonia groups.
Our data suggest that Chlamydia pneumoniae, Mycoplasma pneumoniae and Legionella pneumophila are common pathogens of adult CAP. Chlamydia pneumoniae might be the most frequent atypical pathogen associated with atypical CAP.
Zhonghua jie he he hu xi za zhi = Zhonghua jiehe he huxi zazhi = Chinese journal of tuberculosis and respiratory diseases 09/2010; 33(9):646-50.
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ABSTRACT: The advantage of free perforator flaps versus free musculocutaneous flaps is the reduced morbidity of the donor site with preservation of nerves, muscles and deep fascia. In this study, we evaluated the reconstruction results of deep inferior epigastric artery perforator (DIEAP) free flaps in the head and neck. A retrospective review was performed of 12 patients with head and neck tumor ablation defects that were reconstructed with the deep inferior epigastric artery perforator (DIEAP) free flaps between January 2004 and December 2006. Reconstruction outcomes and complications were measured. Recipient sites were subdivided into defects of total or subtotal glossectomy (N=6), three-dimensional defects of midface (N=3), through and through defects of the cheek (N=2), and anterior skull base resection with an external skin component defect (N=1).The overall free flap success rate was 92% (11/12). One DIEAP free flap was lost because the draining jugular vein thrombosed. No complications were observed in the donor site, including abdominal bulge or hernia. Due to the advantage of minimum donor site morbidity, the DIEAP free flap is a new and reliable reconstruction choice for head and neck surgical defects.
Oral Oncology 08/2008; 45(2):116-20. · 2.86 Impact Factor
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ABSTRACT: To investigate the recovery of rat transected spinal cord injury after implantation of Schwann cells combined with poly (lactide-co-glycolide) (PLGA).
Schwann cells were expanded, co-cultured with PLGA for 9 days in vitro, and then analyzed with scanning electron microscope (SEM). Rat spinal cord at the level of T(9) was transected. Schwann cells labeled with BrdU and PLGA scaffold were implanted to injury site. After 1, 3, 6 months, BrdU/MBP immunohistochemistry double staining, semi-thin sections stained thionin and ultra-thin section were performed to investigate myelin renew. BBB open field locomotion, motor evoked potential (MEP), compound muscle action potential (CMAP) and somatosensory evoked potential (SEP) were recorded.
Schwann cells grew well on PLGA under SEM. BrdU/MBP double positive cells would been seen, remyelination was thin and formed by Schwann cells at 6 months later under electron microscope (EM). BBB behavioral tests revealed no significant difference in recovery comparing with experiment group and control group. The results of MEP, CMAP and SEP showed no significant improvement in the conduction of spinal cord.
There are the compatibility between Schwann cells and PLGA. Although remyelination was found in morphology, function conduction of spinal cord failed to be established.
Zhonghua wai ke za zhi [Chinese journal of surgery] 07/2007; 45(12):843-6.
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ABSTRACT: The advantage of perforator flaps versus musculocutaneous flaps is the reduced morbidity of the donor site with preservation of the nerves, muscles and deep fascia. We evaluate the reconstruction result of perforator flaps in head and neck region.
A retrospective review was performed of perforator flap reconstructions for head and neck tumor ablation defects since December of 2003 to May of 2005. There were 14 flaps including 8 anterolateral thigh (ALT) flaps and 6 deep inferior epigastric artery perforator (DIEAP) flaps. Recipient sites were subdivide into oral tongue (n=3), buccal mucosa (n=3), pharyngeal wall (n=3), base of tongue (n=2), skull base (n=1), scalp (n=1) and midface (n=1).
The overall free flap success rate was 93% (13/14). One DIEAP flap lost because the draining jugular vein was thrombosed. No complications were observed in the donor site, including wound dehiscence, weakness and hernia.
Perforator flaps are the new and reliable technique for head and neck surgical defects. Because of the minimum donor site morbidity, the perforator flap may be one of the primary choice in the near future.
Zhonghua zheng xing wai ke za zhi = Zhonghua zhengxing waike zazhi = Chinese journal of plastic surgery 10/2006; 22(5):347-50.
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ABSTRACT: To investigate the prevention of Frey syndrome after parotidectomy.
A prospective cohort study of 100 patients with parotid cancer who received parotid surgery was underwent in our hospital from 2001 to 2004. These patients were assigned to two groups, study group (50 cases) and control group (50 cases). The patients in the study group received parotidectomy and intraoperative placement of collagen pieces within the parotid bed, between the skin flap and the facial nerve. The patients in the control group received a conventional parotidectomy and no collagen pieces was implanted. All of the patients were followed-up and were evaluated for Frey syndrome with identical questionnaires.
Compared with control group, the incidence rate of Frey syndrome was significantly decreased in the study group (20% vs 60%, chi(2) = 15.04, P < 0.001). Postoperative incidence of facial contour apparent deformity was 80% (40/50) in control group and 44% (22/50) in study group (chi(2) = 12.26, P < 0.001).
Use of collagen pieces as an interposition fill barrier improves parotidectomy outcome by reducing the incidence of Frey syndrome, and it improves cosmetic results concurrently.
Zhonghua wai ke za zhi [Chinese journal of surgery] 08/2006; 44(15):1033-5.
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ABSTRACT: To explore the anterolateral thigh (ALT) free flap in which the donor site is less noticeable and the morbidity is minimal for the reconstruction of head and neck defect.
A retrospective review was performed of 8 ALT flaps reconstructions for head and neck tumor ablation defects between Dec. 2003 and May 2005. Recipient sites were subdivided into pharyngeal wall (n = 3), oral tongue (n = 2), buccal mucosa (n = 1), base of tongue (n = 1) and skull base (n = 1). The operative technique of ALT flap was described.
All 8 free flaps survived. No complication was observed in the donor site, like wound dehiscence, weakness of the legs. The anatomy of the perforators were recognized as musculocutaneous pattern in all 8 cases. The size of the flap ranged from (4 to approximately 8) cm x (5 to approximately 10) cm. The average time of operation was 7 hours with a range of 5 to 10 hours. The average time cost for ATL flap harvest was 80 minutes with a range of 65 to 115 minutes.
Free ALT flap is a reliable reconstruction technique for head and neck surgical defects. Because of the minimum donor site morbidity and the concealed site, this flap is the ideal choice for reconstruction of head and neck surgical defects.
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery 07/2006; 41(6):447-50.
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ABSTRACT: To discuss the use of free jejunal flap in reconstruction for circumferential defect after tumor resection of hypopharyngeal and cervical esophageal cancer.
Retrospective review of 51 patients who underwent circumferential pharyngoesophageal reconstruction with free jejunal flap after tumor ablation.
In 51 patients, 5 had flap failure and the flap success rate was 90% (46/51). Forty-five patients had oral intake after operation excluding one who had anastomosis stenosis and 5 who had flap failure. The 1-year and 3-year survival rate was 62% and 48% respectively. Positive surgical marginal status and external invasion including thyroid gland, carotid artery, skin and pre-vertebral area were indicators for bad prognosis. Except 5 patients who had flap failure, one of which died from mediastinal infection, no other severe complications occurred.
Patients reconstructed with free jejunal flap after resection of hypopharyngeal and cervical esophageal cancer had low mortality and few complications. Those without positive surgical margin and external invasion including thyroid gland, carotid artery, skin and pre-vertebral area had higher survival rate. Most of them had good quality of life. The choice of free jejunal flap for reconstruction of hypopharyngoesophageal defect was appropriate in selected patients who had guarantee of negative surgical margin and no external invasion.
Zhonghua wai ke za zhi [Chinese journal of surgery] 07/2006; 44(11):733-6.
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ABSTRACT: To study the protective effect of volatile anesthetics, isoflurane and sevoflurane, on ischemic neurons after cerebral ischemia-reperfusion in rats and its possible molecular mechanism.
Rat cerebral ischemia-reperfusion model was developed by occlusion of the middle cerebral artery (MCA) and bilateral common carotid arteries (CCAs) 1 h after reperfusion. Using flow cytometry (FCM) and Northern blot hybridization, we calculated the number of apoptotic bodies and detected the expression of bcl-2 mRNA and interleukin-1beta converting enzyme (ICE) mRNA.
The apoptotic bodies in hippocampus analyzed by FCM peaked at appeared 24 h after reperfusion, and decreased about 54% and 40%, respectively, after treatment with isoflurane and sevoflurane, as compared with ischemic group. There was no significant difference in the expression of bcl-2 mRNA and ICE mRNA between the inhaled anesthetic groups and ischemic group in hippocampus 24 h after MCA/CCAs occlusion.
Isoflurane and sevoflurane partially inhibit apoptosis but have no significant effect on the expression of bcl-2 and ICE genes.
Biomedical and Environmental Sciences 05/2006; 19(2):143-6. · 1.35 Impact Factor
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ABSTRACT: To choose the optimal reconstruction for circumferential defects of the hypopharynx between pharyngogastric anastomosis and free jejunal interposition is.
Retrospective review of the archives of 125 patients who underwent pharyngoesophageal reconstruction with pharyngogastric anastomosis(n = 92) or free jejunal interposition(n = 33). Analysis was confined to patient with advanced hypopharyngeal cancer or recurrent laryngeal cancer who had hypopharyngeal circumferential defects after tumor ablation.
The morbidity and mortality associated with reconstructive procedures were significantly higher in the pharyngogastric anastomosis group than in the free jejunal interposition group (43% versus 21%, P = 0.023 and 11% versus 0%, P = 0. 048). The risk factors related to complications associated with the procedures were reconstruction with pharyngogastric anastomosis (OR 2.97; 95% CI 1.14; 7.76) and albumin < 40.0 g/L(OR 2.87; 95% CI 1.33; 6.16) . The occurrence of swallow obstruction or regurgitation was higher in the pharyngogastric anastomosis group than in the free jejunal interposition group(76% versus 12%, P = 0.00). Patients in the pharyngogastric anastomosis group had lost weight of 3.3 kg (95% CI - 5.7; - 1.0) postoperatively, on the contrary, patients in the free jejunal interposition group had gained weight of 2.8 kg(95% CI 0.9; 4.7) postoperatively.
Patients reconstructed with free jejunal interposition had lower mortality and complications than with pharyngogastric anastomosis. Furthermore, the former seems to have better quality of life than the latter. The first choice of reconstructive strategy for hypopharyngeal circumferential defects is free jejunal interposition.
Zhonghua er bi yan hou ke za zhi 07/2004; 39(7):419-24.
