Animals ; Humans ; Spectrometry, Mass, Electrospray Ionization ; Spectrophotometry, Atomic ; Thallium ; analysis ; metabolism

Targeting drug delivery system (TDDS) is one of the most concerned research fields in cancer treatment because it can bind selectively and react with the target diseased sites at the cellular or sub-cellular level, making distribution and release of drugs in a controlled manner, thus enhance therapeutic effects and reduce toxic and side-effects on normal cells. Polyamidoamine dendrimer (PAMAMD) is a kind of newly developed polymer in nanometer degree. Hyper-branched, monodispersity, three-dimensional structure and host-guest entrapment ability make it used as drug carrier, gene delivery system and imaging agent. Various targeting ligands, which have high affinity to specific organs, tissues or cells in human body, can be linked to surface functional groups of PAMAMD. And drugs and theoretical gene are carried by encapsulation or chemical conjugation. Finally, PAMAMD targeting drug delivery system can carry drugs and theoretical gene to diseased sites and then release them for targeted therapy. The PAMAMD-based conjugates have small size, ligh permeability and retention effect (EPR), low toxicity and so on. The research progress of PAMAMD modified by different ligands in targeting drug delivery system is reviewed, and research direction of the PAMAMD targeting delivery system in the future is also suggested.

[Objective]To study the clinical manifestation,early diagnosis and surgical outcomes of traumatic thoracic disc herniation.[Method]Eleven patients of traumatic thoracic disc herniation were selected from June 2000 to June 2005.There were 8 males and 3 females with an average age of 23.96 years old(ranged,15-38 years old).The average time from traumatism to diagnosis were 4.1 months(range,2 days to 8 months).After early clinical diagnosis,discectomy through posterolateral transpedicular approach were carried out for all 11 patients.[Result]All 11 patients were followed up for an average time of 2.6 years(range,1.1～3.8 years).According to Otani's classification criterion,the results were excellent in 7cases,good in 3 cases,fair in I cases,no poor case and failure case.The excellent and good results were obtained in 90.91% of the patients.[Conclusion]The incidence of traumatic thoracic disc herniation is rather low,and this disease has no representative symptom and sign.Early diagnosis and operative treatment is a very effective guarantee to curative effect for traumatic thoracic disc herniation.

[Objective] To investigate the height change of intervertebral space after anterior cervical fusion and its relation to neck axial symptoms.[Method]Totally 122 patients receiving anterior cervical fusion were followed up for 2 to 5 years,average 3.9 years.The height change of intervertebral space of the fused segment on X-rays were evaluated before,3 months and 2 years after operation.All patients were classified into 3 groups by means of the postoperative height change of intervertebral space.The axial symptoms after operation were observed and analyzed during follow-up.[Result]The incidence of neck axial symptoms was 54.55%,25.84% and 45.45%,respectively.There were significant differences in statistical analysis in group A group B,group B to group C(x2=7.18,P0.0125).[Conclusion]There is significant relation between height change of intervertebral space and neck axial symptoms after anterior cervical fusion.

AlM:To determine the group distribution characteristics of lachrymal duct obstruction diseases in major Li Miao minority areas of Hainan province.
METHODS: Totally 5 353 residents were selected and researched by randomized cluster sampling in the major Li Miao minority areas of Hainan province. Ocular examination and lachrymal duct flushing were carried out, and questionnaire survey on lachrymal duct obstruction was conducted. The ratio of lachrymal duct obstruction diseases and group distribution characteristics were analyzed based on above research.
RESULTS: The prevalence ratios of lachrymal duct obstruction was 4. 47% in major Li Miao minority areas of Hainan province, with 2. 62% in urban area, and 5. 93% in rural area respectively. Prevalence ratios of men and women group were 1. 69% and 6. 39% correspondingly. Difference between the two groups was statistically significant (χ2 = 67. 2821, P = 0. 0000 ). The highest prevalence ratio was 40-69 year-old group, second one was 70-79 year-old group, especially for women in these groups. The prevalence ratios of Ledong, Lingshui, Baisha and Changjiang county were higher than those of Baoting, Qiongzhong county and Wuzhishan city. No significant difference was found between both eyes.
CONCLUSlON: ln major Li Miao minority areas of Hainan province, lachrymal duct obstruction mainly occurs in 40-79 year-old patients, with specially higher ratio of women. Statistically, significant difference of the prevalence ratio between urban and rural areas exists. The higher prevalence ratio is attributed to age, gender, geographical location, climate condition, health environment and so on. The prevalence ratio is higher in the dry and windy areas than in the humid and less windy areas.

Aim: To evaluate the safety of glufosfamide in Beagle dogs. Methods: The safety of glufosfamide in Beagle dogs following single iv and multiple iv administration for 3 months was observed. Results: The minimum lethal dose of glufosfamide was 100 mg/kg. The maximum non-lethal dose of glufosfamide was 50 mg/kg. The approximate lethal dose of glufosfamide was 75-100 mg/kg. No serious adverse reactions was observed in Beagle dogs following multiple iv administration once a week for 3 months at the dose of 20 mg/kg, 40 mg/kg, and 60 mg/kg. However, organ injury was observed extensively in the high dose-group and mediumt-dose group. The low-dose group showed a light change in individual organs. Conclusion: Under the experimental conditions, 40 mg/kg and 60 mg/kg iv administration once a week for 3 months can lead to extensive organ injury in Beagle dogs, so the dose shouldn't be higher than 20 mg/kg.

ObjectiveTo evaluate the efficacy and safety of Qingpeng ointment in the treatment of chronic eczema.MethodsTotally,95 patients with chronic eczema were enrolled and divided into 3 groups to receive topical Qingpeng ointment (n =33),0.2％ hydrocortisone cream (n =32),10％ urea ointment (n =30) respectively twice a day for 4 weeks.All the patients were followed up once a week for the evaluation of therapeutic and side effects.ResultsAfter 4-week treatment,the response rate was 78.8％,84.4％ and 46.7％ in the Qingpeng ointment-,hydrocortisone cream- and urea ointment-treated patients respectively.Significant differences were observed in the response rate between the Qingpeng ointment- and urea ointment-treated patients (P ＜ 0.05 ),but not between the hydrocortisone cream- and Qingpeng ointment-treated patients (P ＞0.05).Skin flushing with a sensation of burning was observed at the application sites of 2 patients treated with Qingpeng ointment,and tingling sensation at the application sites was reported in 1 patient treated with hydrocortisone cream.All of these adverse reactions were tolerable and had no influence on the treatment.Conclusion Topical Qingpeng ointment is effective and safe for the treatment of chronic eczema.

BACKGROUND: The experimental results showed that insulin sensitivity and glucose uptake in skeletal muscle could be improved by activating adenosine monophosphate-activated protein kinase a2 (AMPKα2). AMPKa2 is expected to become a new physiological and pharmacological target for the prevention and treatment of type 2 diabetes mellitus. OBJECTIVE: To clone human AMPKa2 subunit gene and to construct its wild-type and mutant eukaryotic expression vectors. DESIGN: A single sample observation.TIME AND SETTING: The experiment was performed in the Clinical Molecular Biology Laboratory, the Second Affiliated Hospital of Sun Yet-sen University from April 2007 to January 2008.MATERIALS: QuikChange II Site-Directed Mutagenesis Kit was produced by Stratagene. Eukaryotic expression vector pcDNA3.1(+) and E. coll DH5a were provided by the laboratory. Human skeletal muscle tissue was from patients who received amputation surgery in the Second Affiliated Hospital of Sun Yat-sen University. Informed consent was obtained from the patients, and fresh samples were collected and frozen in liquid nitrogen.METHODS: The human AMPKo2 subunit gone was amplified from human skeletal muscle by RT-PCR, cloned into T vector, and the recombinant plasmid was confirmed by sequencing. In vitro site-directed mutagenesis was carded out with Quickchange site-directed mutagenesis kit. The wild-type and mutant coding genes were subcloned into eukaryotic expression vector pcDNA3.1, and the recombinant plasmids were validated by enzyme digestion and sequencing.MAIN OUTCOME MEASURES: ①The cloning of aim gone; ②site-directed mutagenesis; ③ eukaryotic expression plasmid. RESULTS: The human AMPKα2 subunit gene (about 1700 bp) was successfully cloned, with 99％ homology to the reported AMPK α2 gene. A GenBank accession number was EF056019, The achieved mutation of the 45<'th> Lysine (AAA) was found to Arginine(AGA). The wild-type and mutant pcDNA-AMPKα2 recombinant plasmids were constructed successfully. CONCLUSIONS: The human AMPKα2 subunit gene was cloned successfully from human skeletal muscle and its wild-type and mutant eukeryotic expression vectors were constructed successfully in the experiment.

Objective To quantitatively analyze the coronary artery ostia by three-dimensional trans-esophageal echocardiography (3D-TEE).Methods The full-volume images of aortic root and coronary artery ostia were acquired by 3D-TEE in 95 adult patients.The Philips QLab 3DQ measurement technology was employed to determine three mutually perpendicular planes:(1) The transverse plane cross the bottom of three coronary artery sinus.(2) The sagittal plane perpendicular to sino-tubular junction.(3) The coronal plane perpendicular to the aforementioned two planes .The following relevant parameters were measured and recorded:(1) Length, width, height and area of bilateral coronary artery ostia .(2) The angle between coronary arterial outflow tract and aortic root in sagittal plane .(3) The spatial distribution of coronary artery ostia, aortic root and coronary artert sinus .Results The shape of left coronary artery ostia were more regular (round or oval) than right coronary artery ostia ( teardrop-shape or oval ).Calcification was more frequent in right coronary artery ostia (81/95, 85.26%) than that in left coronary artery ostia. There were statistical differences between left and right coronary artery in the parameters of ostial wide , area and height (t =3.85, 3.86, -4.49, all P<0.01).Most left coronary artery ostia were located inside the sinus (76/95, 80.00%), mainly in the upper third segment (69/95, 72.63%); while more than half of the right coronary artery ostia were found outside the sinus ( 53/95, 55.79%).The difference was statistically significant( χ2 =25.91, P<0.01).Conclusion The quantitative analysis of aortic root and coronary artery ostia based on the full-volume images originated from real-time 3D-TEE is feasible, which is helpful for further clinical research .

BACKGROUND: Signal transducer and activator of transcription 3 (STAT3) protein is widely expressed in cells and tissues of different type and. It is the important component of signal transduction and transcription chain that participates in the regulation of various physiological functions of cells like proliferation and differentiation. However, there is no literature reported regarding if there is STAT3 expression and whether it participates in embryo liver development both at home and abroad.OBJECTIVE: To explore the effects and mechanism of STAT3 signal transduction route on development of embryo liver by. Studying the expression of STAT3 protein during embryo liver development in mice.DESIGN: Randomized controlled study based on STAT3 protein.SETTING: Department of histology and embryology in a military medical university of Chinese PLA.MATERIALS: The study was completed in the Department of Histology and Embryology, Third Military Medical University of Chinese PLA during January to June 2004. Kunming mice were provided by Animal Centre of Third Military Medical University of Chinese PLA. Ten male mice and 20 female mice with body mass during 25 to 30 grams were randomly chosen.METHODS: Serial frozen sections of mouse embryo was performed in the 13.5 days ( n = 8), 14.5 days ( n = 9) and 15.5 days ( n = 7) after mating respectively. One of the every 2 slices was used as negative control by replacing first antibody of STAT3 with 0. 01 mol/L PBS. Immunochemical technique and immunofluorescence method were used to display the expression of STAT3 protein in embryo liver development in mice.MAIN OUTCOME MEASURES: Expression of STAT3 protein in serial frozen sections of mouse embryo.RESULTS: There was strong expression of STAT3 protein in liver cells in E13.5 days mouse embryo while the expression was decreased in E14.5 days and E15.5 days mouse embryos.CONCLUSION: STAT3 protein has participated in the development of embryo liver. The expression of STAT3 in liver development can be used to explain the mechanism of liver regeneration and provide experimental data for organ repair.