[The long-term efficacy of metformin in megestrol acetate-based fertility-sparing treatment for patients with endometrial atypical hyperplasia and endometrioid endometrial cancer]

Objective: To assess the long-term efficacy of metformin in megestrol acetate (MA)-based fertility-sparing treatment for patients with endometrial atypical hyperplasia (EAH) and endometrioid endometrial cancer (EEC). Methods: The randomized controlled trail study was conducted from October 2013 to October 2017 in the Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China. Patients with EAH or EEC were firstly stratified according to pathology, and randomized to receive MA (160 mg orally, daily) plus metformin (500 mg orally, three times a day) or MA (160 mg orally, daily). Baseline data between two groups of patients were compared. Estimates of time to complete remission (CR) and recurrence-free survival (RFS) were calculated using the Kaplan-Meier method. Cox proportional-hazards regression model was used to estimate hazard ratios (HR) of related factors for recurrence-free survival. Quantitative data were represented by M (Q1, Q3). Results: A total of 150 patients were included, and 76 patients were allocated to receive MA plus metformin with the age of 32.5 (28.0, 36.0), while 74 patients received MA alone with the age of 32.0 (28.0, 36.0). By the end of follow-up period, 96.7% (n=145) of patients achieved complete remission, with a median follow-up time of 57.7 (26.7, 70.5) months. The median CR time for the MA plus metformin group and the MA alone group were 6.3 (3.5, 8.3) months and 6.8 (4.0, 9.3) months, respectively (P=0.193), with 2-year cumulative CR rate of 98.6% and 98.5%, respectively (P=0.879). The median time of RFS was 28.1 (12.5, 57.3) months for the MA plus metformin group and 33.3 (14.1, 62.5) months for the MA alone group (P=0.213), with a cumulative RFS rate of 61.9% and 65.8%, respectively (P=0.560). In the subgroup of non-obese (body mass index<28 kg/m2) patients with EAH, the median RFS times were 25.7 (7.6, 60.3) months and 47.3 (17.5, 64.8) months for the MA plus metformin group and the MA alone group, respectively (P=0.033), with a cumulative RFS rate of 57.5% and 80.6%, respectively (P=0.029). According to Cox proportional hazards regression analysis, undergoing assisted reproductive treatment (HR=2.358, 95%CI: 1.069-5.204, P=0.034) was identified as an independent risk factor for recurrence-free survival after complete remission of endometrial lesions. Conclusion: The long-term follow-up outcome indicates that there is no significant difference in CR time and RFS time between MA plus metformin therapy and MA alone therapy for patients with EAH or EEC.

[Comparison of the effects and safety of dydrogesterone and medroxyprogesterone acetate on endometrial hyperplasia without atypia: a randomized controlled non-inferior phase Ⅲ clinical study]

Objective: To compare the effects and safety of dydrogesterone (DG) and medroxyprogesterone acetate (MPA) on the treatment in patients with endometrial hyperplasia without atypia (EH). Methods: This was a single-center, open-label, prospective non-inferior randomized controlled phase Ⅲ trial. From February 2019 to November 2021, patients with EH admitted to the Obstetrics and Gynecology Hospital of Fudan University were recruited. Enrolled patients were stratified according to the pathological types of simple hyperplasia (SH) or complex hyperplasia (CH), and were randomised to receive MPA or DG. Untill May 14, 2022, the median follow-up time after complete response (CR) was 9.3 months (1.1-17.2 months). The primary endpoint was the 6-month CR rate (6m-CR rate). The secondary endpoints included the 3-month CR rate (3m-CR rate), adverse events rate, recurrence rate, and pregnancy rate in one year after CR. Results: (1) A total of 292 patients with EH were enrolled in the study with the median age of 39 years (31-45 years). A total of 135 SH patients were randomly assigned to MPA group (n=67) and DG group (n=68), and 157 CH patients were randomly assigned to MPA group (n=79) and DG group (n=78). (2) Among 292 patients, 205 patients enrolled into the primary endpoint analysis, including 92 SH patients and 113 CH patients, with 100 patients in MPA group and 105 in DG group, respectively. The 6m-CR rate of MPA group and DG group were 90.0% (90/100) and 88.6% (93/105) respectively, and there were no statistical significance (χ²=0.11, P=0.741), with the rate difference (RD) was -1.4% (95%CI:-9.9%-7.0%). Stratified by the pathology types, the 6m-CR rate of SH patients was 93.5% (86/92), and MPA group and DG group were respectively 91.1% (41/45) and 95.7% (45/47); and the 6m-CR rate of CH patients was 85.8% (97/113), and MPA group and DG group were 89.1% (49/55) and 82.8% (48/58) respectively. The 6m-CR rates of the two treatments had no statistical significance either (all P>0.05). A total of 194 EH patients enrolled into the secondary endpoint analysis, including 88 SH patients and 106 CH patients, and 96 patients in MPA group and 98 in DG group, respectively. The 3m-CR rate of SH patients were 87.5% (77/88), while the 3m-CR rates of MPA group and DG group were 90.7% (39/43) and 84.4% (38/45), respectively; the 3m-CR rate of CH patients was 66.0% (70/106), and MPA group and DG group had the same 3m-CR rate of 66.0% (35/53). No statistical significance was found between the two treatments both in SH and CH patients (all P>0.05). (3) The incidence of adverse events between MPA group and DG group had no statistical significance (P>0.05). (4) A total of 93 SH patients achieved CR, and the cumulative recurrence rate in one year after CR were 5.9% and 0 in MPA group and DG group, respectively. While 112 CH patients achieved CR, and the cumulative recurrence rate in one year after CR were 8.8% and 6.5% in MPA group and DG group, respectively. There were no statistical significance between two treatment groups (all P>0.05). Among the 93 SH patients, 10 patients had family planning but no pregnancy happened during the follow-up period. Among the 112 CH patients, 21 were actively preparing for pregnancy, and the pregnancy rate and live-birth rate in one year after CR in MPA group were 7/9 and 2/7, while in DG group were respectively 4/12 and 2/4, and there were no statistical significance in pregnancy rate and live-birth rate between the two treatment groups (all P>0.05). Conclusions: Compared with MPA, DG is of good efficacy and safety in treating EH. DG is a favorable alternative treatment for EH patients.

[Preliminary exploration of the metabolic profile and metabolic pathways in newly diagnosed multiple myeloma]

Objective: To explore the metabolite profile and metabolic pathways of newly diagnosed multiple myeloma (MM). Methods: Gas chromatography-mass spectrometry (GC-MS) was employed for the high-throughput detection and identification of serum samples from 55 patients with MM and 37 healthy controls matched for age and sex from 2016 to 2017 collected at the First Affiliated Hospital of Soochow University. The relative standard deviation (RSD) of quality control (QC) samples was employed to validate the reproducibility of GC-MS approach. The differential metabolites between patients with MM and healthy controls were detected by partial least squares discrimination analysis (PLS-DA), and t-test with false discovery rate (FDR) correction. Metabolomics pathway analysis (MetPA) was employed to construct metabolic pathways. Results: There were 55 MM patients, including 34 males and 21 females. The median age was 60 years old (42-73 years old). There were 30 cases of IgG type, 9 cases of IgA type, 1 case of IgM type, 2 cases of non-secreted type, 1 case of double clone type and 12 cases of light chain type, including 3 cases of kappa light chain type and 9 cases of lambda light chain type. The result of QC sample test showed that the proportion of compounds with the RSD of the relative content of metabolites < 15% was 70.21% obtained by the reproducibility of GC-MS experimental data, which implied that the experimental data were reliable. A total of 17 metabolites were screened differently with the healthy control group, including myristic acid, hydroxyproline, cysteine, palmitic acid, L-leucine, stearic acid, methionine, phenylalanine, glycerin, serine, isoleucine, tyrosine, valine, citric acid, inositol, threonine, and oxalic acid (VIP>1, P<0.05). Metabolic pathway analysis suggested that metabolic disorders in MM patients comprised mainly phenylalanine metabolism, glyoxylic acid and dicarboxylic acid metabolism, phosphoinositide metabolism, cysteine and methionine metabolism, glycerolipid metabolism, glycine, serine, and threonine metabolism. Conclusion: Compared with normal people, patients with newly diagnosed MM have obvious differences in metabolic profiles and metabolic pathways.

Using mixed silages of sweet sorghum and alfalfa in total mixed rations to improve growth performance, nutrient digestibility, carcass traits and meat quality of sheep

Combining sweet sorghum (SS) with alfalfa for ensiling has the potential to make a high-quality silage with relatively a better nutrient balance. However, the existing data are insufficient about how changes in ratios of SS to alfalfa in different silage mixtures affect animal performance and meat quality. Therefore, the objective of this study was to determine the effect of feeding total mixed rations containing mixed silages of SS and alfalfa on growth performance, nutrient digestibility, carcass traits and meat quality of Karakul sheep. Five total mixed rations were formulated with different SS proportions at 100%, 80%, 60%, 40%, and 20% on a fresh weight basis. Thirty 4-month old male Karakul sheep with 25.5 ± 1.4 kg BW were randomly allocated into five treatment groups, each with six lambs for this experiment. The results indicated that the Karakul sheep consuming total mixed rations containing SS-Alfalfa (SS-AF) silage mixtures with a lower proportion of SS tended to increase nutrient digestibility, growth performance, carcass traits, and meat quality. Feeding diets with SS at 40% and 20% inclusion rate showed a significant linear increase in the apparent digestibility of DM, CP and NDF, as well as subcutaneous fat thickness and water holding capacity (P < 0.5). Moreover, reduction in SS inclusion rate in these diets caused significant (P < 0.05) linear and quadratic increases in DM intake, final BW, average daily gain, carcass weight, and the amino acid contents of meat (P < 0.05). Conversely, feeding diet with lower SS inclusion rate led to decrease in feed conversion ratio and shear force significantly (P < 0.05) for these sheep. It appears that 40% inclusion of SS was the optimal rate in making the SS-AF silage mixture for lambs to achieve a superior production performance and high-quality meat products in Karakul sheep. However, further research is needed to investigate the effect of feeding SS-AF silage mixtures alongside contrasting ingredients on rumen function, ruminal microorganisms and digestive enzyme activity of sheep and other ruminant animals.

Effect of thermosonication process on physicochemical properties and microbial load of goat's milk

In this study, thermosonication was used as a combined treatment of raw goat milk (RGM) using pasteurization (72 °C for 15 s) and ultrasound treatments (20 kHz at the power variance of 150 W, 200 W, 300 W and 400 W for 10 min). Investigation on the impact of the microbial load, protein content, protein aggregation, the particle size of fat and casein micelles, pH, viscosity, turbidity, color, and soluble calcium and phosphorus contents were carried out, whiles RGM and PGM served as the control. Our results revealed that at 400 W, that thermosonication resulted in a significant reduction (α = 0.05) in the microbial load of the samples to less than 2.3 log cfu/mL in comparison to those of RGM and pasteurized goat milk (PGM) at 5.94 log cfu/mL and 4.76 log cfu/mL respectively. In RGM, the fat size (3.5 µm) decreased to 0.4 µm at 300 W; while those of casein micelles also decreased from 406 to 256.4 nm at 400 W. However, no significant effect was observed in the color and soluble calcium and phosphorus contents of all samples. The effect on the microbial load and fat homogenization would promote thermosonication process in the dairy industry.

Long non-coding RNA homeobox (HOX) A11-AS promotes malignant progression of glioma by targeting miR-124-3p

Glioma is the most common and serious form of primary tumor in adult central nervous system. HOXA11-AS is a LncRNA located in the HOXA gene cluster. In the present study, we investigated the expression and function of LncRNA HOXA11-AS in glioma tissues and cells. We found that LncRNA HOXA11-AS expression was markedly elevated in glioma tissues compared to normal brain tissues. The LncRNA HOXA11-AS expression in cases of high-grade glioma was significantly higher than that in cases of low-grade. Patients with high LncRNA HOXA11-AS expression had shorter OS time than those with low LncRNA HOXA11-AS expression. Moreover, silencing LncRNA HOXA11-AS inhibited cell proliferation, increased apoptosis, and inhibited invasion and migration of glioma cells. Overexpression of LncRNA HOXA11- AS increased cell proliferation, decreased apoptosis, and increased invasion and migration of glioma cells. miR-124-3p has relevant binding sites in HOXA11-AS. Silencing HOXA11-AS significantly increased miR-124-3p expression. The miR-124-3p overexpression decreased the luciferase activity of the pMIR luciferase reporter containing HOXA11-AS-WT but not HOXA11-AS-MUT. Moreover, miR-124-3p was pulled down by HOXA11-AS probe. miR-124-3p mimics inhibited cell proliferation, increased apoptosis, and inhibited invasion and migration of glioma cells. miR-124-3p mimics significantly suppressed overexpression of HOXA11-AS-induced increase of proliferation, decrease of apoptosis and increase of invasion and migration. miR-124-3p inhibitors suppressed the effect of siHOXA11-AS on proliferation, apoptosis, invasion and migration. In summary, the findings highlight the importance of LncRNA HOXA11-AS/miR-124-3p axis in the regulation of glioma progression. LncRNA HOXA11-AS/miR-124-3p might serve as a potential therapeutic target in glioma treatment in the future.

Long non-coding RNA DANCR facilitates glioma malignancy by sponging miR-33a-5p

Glioma is among the most fatal brain tumors characterized by a highly malignancy and rapid progression and early metastasis. Dysregulation of long non-coding RNA differentiation antagonizing non-protein coding RNA (LncRNA DANCR) is associated with the development, progression and metastasis of various cancers. In the present study, we investigated functional role of LncRNA DANCR in the malignancy of glioma. The results showed that LncRNA DANCR was increased in glioma tissues and cells compared with normal brain tissues and cells. DANCR expression was positively correlated with the malignancy and poor prognosis of glioma patients. DANCR contained a binding site of miR-33a-5p. miR-33a-5p was decreased in glioma tissues and cells compared with normal brain tissues and cells. Downregulation of miR-33a-5p was positively correlated with the malignancy and poor prognosis of glioma patients. In glioma tissues, the expression of DANCR was negatively correlated with the expression of miR-33a-5p. Downregulation of DANCR increased miR-33a-5p expression. miR-33a-5p mimic reduced the luciferase of DANCR-WT but not DANCR-MUT. DANCR pull-down showed the expression of miR-33a-5p. miR-33a-5p mimic enhanced knockdown of DANCR -induced inhibition of cell proliferation, migration, and EMT, and increase of apoptosis. Anti-miR-33a-5p reversed the effects of si- DANCR on cell malignancy. Knockdown of DANCR remarkably reduced the increase of tumor volumes in xenograft mouse models. In tumor tissues, knockdown of DANCR increased the expression of miR-33a-5p, reduced EMT and increased apoptosis. Our study provides novel insights in the functions of LncRNA DANCR-miR-33a-5p axis in tumorigenesis of glioma.

Long non-coding RNA SNHG16 contributes to glioma malignancy by competitively binding miR-20a-5p with E2F1

Glioma is among the most fatal and highly aggressive primary malignant tumors in the central nervous system. Small nucleolar RNA host gene 16 (SNHG16) is identified to play an oncogenic role in several cancers. However, the exact mechanism of SNHG16 action in the regulation of glioma development remains unknown. LncRNA SNHG16 was increased in glioma tissues and cells compared with normal brain tissues and cells. SNHG16 expression was correlated with the malignancy and poor prognosis of glioma patients. SNHG16 and E2F1 contained a binding site of miR-20a-5p. miR-20a-5p was decreased in glioma tissues and cells compared with normal brain tissues and cells. Downregulation of miR-20a-5p was correlated with the malignancy and poor prognosis of glioma patients. In glioma tissues, the expression of SNHG16 was negatively correlated with miR-20a-5p. Downregulation of SNHG16 increased miR-20a-5p expression. miR-20a-5p mimic reduced the luciferase activity of SNHG16 and E2F1; miR-20a-5p mimic enhanced the inhibition of cell proliferation, invasion, migration, and EMT, and increase of apoptosis induced by SNHG16 knockdown. Anti-miR-20a-5p reversed the effects of shSNHG16. We also found that SNHG16 may act as a ceRNA for miR-20a-5p, enhancing the expression of E2F1. Additionally, knockdown of SNHG16 remarkably reduced the increase of tumor volumes in xenograft mouse models. In tumor tissues, knockdown of SNHG16 increased the expression of miR-20a-5p, reduced EMT and increased apoptosis. In conclusion, SNHG16 promotes glioma tumorigenesis by sponging miR-20a-5p, leading to the enhancement of its endogenous targets E2F1. The data provides a new clue for the role of SNHG16/miR-20a-5p/E2F1 in the development of glioma.

[The role of Tim-3 mRNA in acute graft-versus-host disease after allogeneic hematopoietic stem cell transplantation]

目的

探讨T细胞免疫球蛋白黏蛋白结构域分子3(Tim-3）mRNA表达在异基因造血干细胞移植（allo-HSCT）后急性移植物抗宿主病（aGVHD）中的作用。

方法

回顾性分析100例allo-HSCT患者，根据患者aGVHD状态[0（未发生）~Ⅰ度aGVHD组、Ⅱ~Ⅳ度aGVHD治疗前组、Ⅱ~Ⅳ度aGVHD治疗好转组]及移植后不同阶段（+14~＋30 d、+31~＋60 d、+61~＋100 d）比较各组外周血单个核细胞Tim-3 mRNA及血浆IFN-γ、IL-2水平。

结果

0~Ⅰ度aGVHD患者＋31~＋60 d Tim-3 mRNA相对定量（7.24±2.79）明显高于＋14~＋30 d(4.60±1.66）及＋61~＋100 d(3.86±1.36）（P值均<0.05）；+14~＋30 d、+31~＋60 d、+61~＋100 d Ⅱ~Ⅳ度aGVHD治疗前组的Tim-3 mRNA水平分别为9.54±3.05、10.14± 3.28、12.82±4.20，+14~+30 d、+61~＋100 d，均高于0~Ⅰ度aGVHD组及治疗好转组；+31~＋60 d Ⅱ~Ⅳ度aGVHD治疗前组明显高于治疗好转组（2.49±0.89），与0~Ⅰ度aGVHD组（7.24±2.79）相比差异无统计学意义；Ⅱ~Ⅳ度aGVHD组中Tim-3 mRNA水平在不同aGVHD程度、不同脏器之间比较差异均无统计学意义（P>0.05）。Ⅱ~Ⅳ度aGVHD治疗前组血浆IFN-γ、IL-2水平明显高于其他各组，治疗好转组血浆IFN-γ、IL-2水平与0~Ⅰ度aGVHD组比较差异无统计学意义。

结论

Tim-3在aGVHD的发生过程中发挥着重要作用。

An ultrasensitive SERS sensor for simultaneous detection of multiple cancer-related miRNAs

Simultaneous detection of multiple trace cancer associated serum miRNA biomarkers is considered as a feasible method for early cancer screening and diagnosis. In the present work, an ultrasensitive SERS sensor was prepared based on an Ag nanorod array SERS substrate by assembling special hairpin-shaped molecular beacons (MBs) for the detection of multiple lung cancer-related miRNA biomarkers. The portable SERS sensor exhibits excellent performance for the qualitative and quantitative detection of miRNAs, with advantages of ultra-sensitivity, good specificity, uniformity, reproducibility and stability, as well as remarkable reusability. By monitoring the SERS signal quenching of the MBs in the presence of target miRNA biomarkers, three lung cancer related-miRNAs (miRNA-21, miRNA-486, and miRNA-375) in buffer and human serum were simultaneously assayed using the SERS sensor array, and the limits of detection of the three miRNAs in human serum are 393 aM, 176 aM, and 144 aM, respectively. The reliable results demonstrate that the proposed SERS sensor array can be a promising candidate with great potential for the screening and clinical diagnosis of cancer in the early stage.

Gold nanoflowers with tunable sheet-like petals: facile synthesis, SERS performances and cell imaging

Gold nanoflowers with tunable sheet-like petals were controllably synthesized, and their SERS performances as well as their application in cell imaging were studied.

Facile synthesis of hydrangea flower-like hierarchical gold nanostructures with tunable surface topographies for single-particle surface-enhanced Raman scattering

The physicochemical properties of noble metal nanocrystals depend strongly on their size and shape, and it is becoming clear that the design and facile synthesis of particular nanostructures with tailored shape and size is especially important. Herein a novel class of hydrangea flower-like hierarchical gold nanostructures with tunable surface topographies and optical properties are prepared for the first time by a facile, one-pot, seedless synthesis using ascorbic acid (AA) to reduce hydrogen tetrachloroaurate (HAuCl4) in the presence of (1-hexadecyl)trimethylammonium chloride (CTAC). The morphologies of the synthesized gold nanoflowers are controlled and fine-tuned by varying the synthetic conditions such as the concentration of reagents and the growth temperature. Due to their unique hierarchical three-dimensional (3D) structures with rich hot spots, these gold nanoflowers exhibit an efficient performance in single-particle surface-enhanced Raman scattering (SERS). The work stands out as an interesting approach for anisotropic particle synthesis and morphological control, and the proposed novel, hierarchical gold nanoflowers have a number of exciting potential applications in SERS-based sensors.

ESAT-6- and CFP-10-specific Th1, Th22 and Th17 cells in tuberculous pleurisy may contribute to the local immune response against Mycobacterium tuberculosis infection

Th1 cell-mediated adaptive immune response is very important but may not be sufficient to control Mycobacterium tuberculosis (M. tuberculosis) infection. The roles of the various T cell subsets and cytokines in the inflammatory processes are not clearly elucidated. We investigated whether Th1, Th22 and Th17 cells mediated cellular immunity at the local site of M. tuberculosis infection in patients with tuberculous pleurisy (TBP). The results showed that the cytokines IFN-γ and IL-22 but not IL-17 were elevated in tubercular pleural fluid. Following stimulation with immune-dominant peptides of early secreted antigenic target-6 (ESAT-6), culture filtrate protein-10 (CFP-10) or Bacille Calmette-Guerin, pleural fluid mononuclear cells expressed high levels of cytokines IFN-γ, IL-22 and IL-17 as revealed by mRNA and protein measurements. In addition, we showed that cytokines IFN-γ, IL-22 and IL-17 were produced in M. tuberculosis-specific immune response by distinct subsets of CD4+ T cells with the phenotype of CD45RA-CD62L-CCR7+CD27+ . Our results demonstrated for the first time that ESAT-6- and CFP-10-specific Th1, Th22 and Th17 cells existed in the patients with TBP and might play an essential role against M. tuberculosis infection. The findings of this study raised the possibility of unravelling the critical targets for therapeutic intervention in chronic inflammatory diseases such as TBP.

Low-molecular-weight heparin successfully treating a nephrotic patient complicated by renal and ovarian vein thrombosis and pulmonary embolism

Thromboembolic complications, frequently associated with idiopathic membranous glomerulonephritis, are frequent and serious problems associated with nephrotic syndrome. However, ovarian vein thrombosis associated with nephrotic syndrome has never been reported. This study describes the case of a 35-year-old woman with idiopathic membranous glomerulonephritis who developed left renal vein thrombosis with ovarian vein thrombosis and pulmonary embolism. The thromboembolic complications were successfully treated with low-molecular-weight heparin. Low-molecular-weight heparin thus appears safe and effective for treating thromboembolism in nephrotic patients.

[Clinical observation on treatment of asthma in moderate degree with fluticasone inhalation combined with jinacon]

OBJECTIVE

To observe the efficacy of Fluticasone inhalation combined with Jinacon (JNC) orally taken in treating patients of chronic asthma (CA) of moderate degree.

METHODS

Seventy-two CA patients were divided into three groups randomly and treated with Fluticasone inhalation combined with JNC, Fluticasone inhalation alone and JNC alone respectively for 4 weeks. The changes of clinical symptoms, airway reactivity and pulmonary function after treatment were observed.

RESULTS

The clinical symptoms, pulmonary function and airway hyper-reactivity were improved in all the three groups after treatment (P < 0.05 or P < 0.01), but the improvement was more significant in the group treated with the combined therapy (P < 0.05 or P < 0.01).

CONCLUSION

Fluticasone inhalation combined with JNC orally taken is an effective therapy in treating patients of chronic asthma of moderate degree.

Isolated Rosai-Dorfman disease presenting as peripheral mononeuropathy and clinically mimicking a neurogenic tumor: case report

BACKGROUND

Rosai-Dorfman disease is a rare idiopathic disorder of proliferative histiocytes affecting the lymph nodes. It usually manifests as bilateral cervical lymphadenopathy and fever with concurrent polyhyperglobulinemia. Cases involving the nervous system are quite rare; most CNS lesions are located intracranially or arise from the spinal dura or leptomeninges. To our knowledge, there has been no previous report of isolated Rosai-Dorfman disease presenting as peripheral mononeuropathy.

CASE REPORT

We report a 43-year-old female with isolated extranodal Rosai-Dorfman disease in the medial aspect of the right upper arm, which presented as aberrant ulnar neuropathy caused by a mass encasing the right basilic vein and the medial anteriobrachial cutaneous branch of the right ulnar nerve. Preoperative diagnosis was a neurogenic tumor. The patient underwent excision of the mass, and pathologic examination confirmed the diagnosis of Rosai-Dorfman disease.

CONCLUSION

An unusual case of extranodal isolated Rosai-Dorfman disease, presenting as peripheral mononeuropathy, is reported. Clinically, it simulated a neurogenic tumor, extending the etiologic spectrum of entrapment neuropathy of the peripheral nerve.

The effects of tibial rotation on the patellofemoral joint: assessment of the changes in in situ strain in the peripatellar retinaculum and the patellofemoral contact pressures and areas

The objective of this study was to determine the effects of tibial rotation on in situ strain in the peripatellar retinaculum and patellofemoral contact pressures and areas. Patellofemoral joint biomechanics demonstrate a strong correlation with the etiology of patellofemoral disorders, such as chondromalacia, and are significantly influenced by tibial rotation. Six human cadaveric knees were used along with a patellofemoral joint testing jig that permits physiological loading of the knee extensor muscles. Patellofemoral contact pressures and areas were measured with a Fuji pressure-sensitive film, and the changes in in situ strain in the peripatellar retinaculum were measured with four differential variable reluctance transducers. Tibial rotation had a significant effect on patellofemoral joint biomechanics. The data showed an inverse relationship between increasing knee flexion angles and the change in patellofemoral contact pressures and in situ strain with tibial rotation. At higher knee flexion angles, the patella is well-seated in the trochlear groove and the function of the peripatellar retinaculum is minimized and less affected by tibial rotations.

Extracellular polysaccharides of modified strains of Erwinia spp

The structure of the extracellular polysaccharide (EPS) produced by Erwinia chrysanthemi strain A2148 has been determined using low pressure size-exclusion and anion-exchange chromatographies, high pH anion-exchange chromatography, glycosyl-linkage analysis, and 1D 1H NMR spectroscopy. The polysaccharide is structurally similar, if not identical, to the EPS produced by E. chrysanthemi strain A350. A streptomycin-resistant strain of E. chrysanthemi Ech6 (Ech6S(+)) has been generated and has an elevated production of EPS, as does a streptomycin-resistant strain (Ech9Sm6) of E. chrysanthemi Ech9. These modified E. chrysanthemi spp. have been ribotyped and found to be closely related to their parent strains.

Pyruvated galactose and oligosaccharides from Erwinia chrysanthemi Ech6 extracellular polysaccharide

The acidic extracellular polysaccharide of Ech6 was depolymerized by fuming HCl. The pyruvated sugars were isolated and characterized by methods that included a combination of low-pressure gel-filtration and high-pH anion-exchange chromatographies, methylation linkage analyses, mass (GC-MS and MALDI-TOF MS) and 1H NMR (1D and 2D) spectroscopies. The following pyruvated sugars were obtained: 4,6-O-(1-carboxyethylidene)-D-Galp; 4,6-O-(1-carboxyethylidene)- alpha-D-Galp-(1-->4)-beta-D-GlcAp-(1-->3)-D-Galp; 4,6-O-(1-carboxyethylidene)-alpha-D-Galp-(1-->4)-alpha-D-GlcAp- (1-->3)-alpha-D-Galp-(1-->3)-L-Fucp; 4,6-O-(1-carboxyethylidene)-alpha-D-Galp-(1-->4)-beta-D-GlcAp-(1-->3) -alpha-D-Galp-(1-->3)-L-[beta-D-Glcp-(1-->4)]-Fucp. These oligosaccharides present potential haptenes for the development of specific antibodies and confirm the partial structure proposed previously for the extracellular polysaccharide from Erwinia chrysanthemi Ech6 [Yang, B. Y.; Gray, J. S. S.; Montgomery, R. Int. J. Biol. Macromol., 1994, 16, 306-312].

Deep vein thrombosis after total knee arthroplasty

BACKGROUND AND PURPOSE

The incidence of deep vein thrombosis (DVT) after total knee arthroplasty (TKA) in the Asian population is probably higher than is commonly assumed by clinicians. The purpose of this study was to investigate the incidence of DVT after TKA in a southern Taiwanese population and to determine whether routine prophylaxis against DVT is indicated.

MATERIALS AND METHODS

The incidence of DVT was investigated in 107 ascending venograms performed in 105 knees in 102 patients after TKA. Observations were made and interpreted by orthopedic radiologists blinded to the clinical condition of the patients. The correlation of DVT with the medical conditions, anesthesia type, and local physical findings were analyzed.

RESULTS

The overall incidence of DVT after TKA was 63.6% (68/107); 95.6% (63/68) of cases involved the distal veins in the calf and only 4.4% (3/68) involved the proximal vein at the popliteal level. There was no higher incidence of thrombosis in the femoral and iliac veins, and no pulmonary embolism. Approximately 70% of patients with DVT were symptomatic and required treatment. There was no statistically significant correlation of DVT with medical condition, including diabetes mellitus, hypertension, body weight, varicosity, history of thromboembolic disorder and congestive heart failure, or the type of anesthesia or bone cement used. There was a positive correlation of DVT with local physical findings including calf girth enlargement, leg edema, and skin discoloration, and a negative correlation with findings including Homans' sign, cord induration, venous engorgement, and knee effusion.

CONCLUSION

The incidence of DVT after TKA in this southern Taiwanese cohort was similar to that in Western populations, and higher than is commonly assumed by clinicians at this facility. However, the rate of proximal thrombosis and pulmonary embolism was much lower than in previous studies from Western populations. The majority of cases of DVT involved the veins in the calf; approximately 70% of patients were symptomatic and required treatment.

Extracellular polysaccharide of Erwinia chrysanthemi A350 and ribotyping of Erwinia chrysanthemi spp

Erwinia chrysanthemi spp. are gram-negative bacterial phytopathogens causing soft rots in a number of plants. The structure of the extracellular polysaccharide (EPS) produced by the E. chrysanthemi strain A350, which is a lacZ- mutant of the wild type strain 3937, pathogenic to Saintpaulia, has been determined using a combination of chemical and physical techniques including methylation analysis, low-pressure gel-filtration and anion-exchange chromatography, high-pH anion-exchange chromatography, partial acid hydrolysis, mass spectrometry and 1- and 2D NMR spectroscopy. In contrast to the structures of the EPS reported for other strains of E. chrysanthemi, the EPS from strain A350 contains D-GalA, together with L-Rhap and D-Galp in a 1:4:1 ratio. Evidence is presented for the following hexasaccharide repeat unit: [structure: see text] All the Erwinia chrysanthemi spp. studied to date have been analyzed by ribotyping and collated into families, which are consistent with the related structures of their EPS.

Degree of acetylation of heteropolysaccharides

The acetyl groups in polysaccharides and glycoproteins have been determined using 4 N HCl at 120 degrees C for acid hydrolysis. Acetic acid and hexosamine were determined by high-performance cation-exchange chromatography with UV detection and high-performance anion-exchange chromatography with pulsed amperomeric detection, respectively. The method compares well with other procedures and shows an additional advantage of being able to analyze for hexosamine in the same hydrolyzate, thus permitting the degree of acetylation of hexosamine-containing biopolymers to be determined directly without correction for additional components in the material of interest.

Adenosine-induced transient asystole for management of a basilar artery aneurysm. Case report

Advances in anesthetic and surgical management, such as induced deep hypothermic circulatory arrest and application of temporary clips, have improved outcome for patients with basilar artery aneurysms. Nonetheless, these techniques are associated with significant risks. The authors report a case in which three transient periods of cardiac asystole were induced during basilar artery aneurysm surgery. Adenosine-induced asystole facilitated the safe clipping of the aneurysm by producing consistent periods of profound hypotension and collapse of the aneurysm without the need for temporary clipping. This technique provided unencumbered identification of perforating arteries, precise definition of the local anatomy, and an ideal environment for the safe placement of the aneurysm clip.

Early embryonic expression of the growth hormone family protein genes in the developing rainbow trout, Oncorhynchus mykiss

In fish, growth hormone (GH), prolactin (PRL) and somatolactin (SL) are three major peptide hormones produced in the pituitary gland. Using reverse transcription-polymerase chain reaction (RT-PCR) and Southern blot analysis of the amplified products, the expression of GH, PRL, and SL genes were determined during the embryonic development in rainbow trout (Oncorhynchus mykiss). The mRNA for GH, PRL and SL were detected not only in embryos prior to or after organogenesis of the pituitary gland but also in mature oocytes as maternal messages. After hatching, all of these three mRNA species were detected at very high levels. Since the ontogenesis of the pituitary gland takes place on embryonic day (ED) 14, these observations suggest that the GH family protein genes are expressed in the developing embryos prior to the formation of the pituitary gland. Using the same RT-PCR assay, PRL mRNA was detected only in the head part of the fry whereas GH and SL mRNA were detected in both the head and trunk. In adult animals, though high levels of GH mRNA were primarily detected in the pituitary gland, brain, gill, and heart, low levels of GH mRNA were also detected in the kidney, liver, pyloric ceaca, and ovary. Results of the current study and those reported by Yang et al. (1997. Gen Comp Endocrinol 106:271-281) suggest that GH and SL genes are also expressed in extrapituitary tissues even after the organogenesis of the pituitary gland. Furthermore, these results suggest that these hormones may play important roles yet to be identified during embryonic development in fish.

Extracellular polysaccharide of Erwinia chrysanthemi CU643

Erwinia chrysanthemi are gram-negative bacterial phytopathogens causing soft rots in a number of plants. The structure of the extracellular polysaccharide (EPS) produced by E. chrysanthemi strain CU643, pathogenic to Philodendron, has been determined using a combination of chemical and physical techniques including methylation analysis, high- and low-pressure gel-filtration and anion-exchange chromatography, high-pH anion-exchange chromatography, partial acid hydrolysis, mass spectrometry, and 1- and 2-D NMR spectroscopy. In contrast to the structures of the EPS reported for other strains of E. chrysanthemi, the EPS from strain CU643 is a linear polysaccharide containing L-Rhap, D-Galp, and D-GlcAp in the ratio 4:1:1. Evidence is presented for the following hexasaccharide repeat unit: -->3)-beta-D-Galp-(1-->2)-alpha-L-Rhap-(1-->4)-beta-D-GlcAp- (1-->2)-alpha-L- Rhap-(1-->2)-alpha-L-Rhap-(1-->2)-alpha-L-Rhap-(1-->(1 ).

Chromosome map of Xanthomonas campestris pv. campestris 17 with locations of genes involved in xanthan gum synthesis and yellow pigmentation

No plasmid was detected in Xanthomonas campestris pv. campestris 17, a strain of the causative agent of black rot in cruciferous plants isolated in Taiwan. Its chromosome was cut by PacI, PmeI, and SwaI into five, two, and six fragments, respectively, and a size of 4.8 Mb was estimated by summing the fragment lengths in these digests. Based on the data obtained from partial digestion and Southern hybridization using probes common to pairs of the overlapping fragments or prepared from linking fragments, a circular physical map bearing the PacI, PmeI, and SwaI sites was constructed for the X. campestris pv. campestris 17 chromosome. Locations of eight eps loci involved in exopolysaccharide (xanthan gum) synthesis, two rrn operons each possessing an unique I-CeuI site, one pig cluster required for yellow pigmentation, and nine auxotrophic markers were determined, using mutants isolated by mutagenesis with Tn5(pfm)CmKm. This transposon contains a polylinker with sites for several rare-cutting restriction endonucleases located between the chloramphenicol resistance and kanamycin resistance (Kmr) genes, which upon insertion introduced additional sites into the chromosome. The recA and tdh genes, with known sequences, were mapped by tagging with the polylinker-Kmr segment from Tn5(pfm)CmKm. This is the first map for X. campestris and would be useful for genetic studies of this and related Xanthomonas species.

Heterogeneity of glycans at each N-glycosylation site of horseradish peroxidase

The tryptic glycopeptides of horseradish peroxidase isozyme c (HRPc) were studied by methylation linkage analysis, exoglycosidase degradation, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDITOFMS). Over 90% of the predicted tryptic peptides and glycopeptides of HRPc could be identified in the unfractionated digest. Four glycans, namely (Xyl)Man3(Fuc)GlcNAc2 (major species), (Xyl)Man2(Fuc)GlcNAc2, (Xyl)Man3GlcNAc2, and Man3(Fuc)GlcNAc2 (minor species), were observed at all of the N-glycosylation sites and account for greater than 95% of the carbohydrate. Other members of this glycan family, namely (Xyl)xManm(Fuc)f GlcNAc2 (x = 0 or 1, f = 0 or 1, m = 4, 5, 6, or 7), account for the rest of the glycans. Only traces of high mannose-type glycans were detected in HRPc. Two sites, namely those at Asn-57 and Asn-267, were found to be more heterogeneous than the sites at Asn-13, Asn-158, Asn-186, 198 (doubly glycosylated peptide), Asn-214, and Asn-255. Two of the glycopeptides were observed as part of disulfide-linked species. MALDITOFMS confirmed the N-glycosylation sites previously reported [K.G. Welinder, Eur. J. Biochem., 96 (1979) 483-502] and was used to determine the heterogeneity of the glycan pool at each site.

Renal squamous cell carcinoma: CT findings and clinical significance

BACKGROUND

To study the biological behavior of renal squamous cell carcinoma (RSCC).

METHODS

Fifteen cases of RSCC were retrospectively studied. These cases were classified as central (eight cases) and peripheral (seven cases) types by the tumor location. The clinical data and computed tomographic findings were analyzed and compared.

RESULTS

High incidence (87%) of urolithiasis was observed. The prognosis of RSCC was very poor, with a median survival time of 3.5 months. The infectious symptoms, central location, and modified stage IV of the tumor were the poor prognostic factors of RSCC. Two types of RSCC were different in the presenting symptoms, lymph node metastasis, modified tumor staging, and survival time.

CONCLUSION

The central and peripheral types of RSCC were different biologically. High index of suspicion should be maintained when identifying the subtle clues of malignancy in patients with urolithiasis.

Variations of the middle and inferior right hepatic vein: application in hepatectomy

We evaluated the anatomic variations of the middle right hepatic vein (MRHV) and inferior right hepatic vein (IRHV) and their clinical application to the possibility of right subtotal hepatectomy. In 400 of normal livers studied with ultrasound, the IRHV was found to drain segment 6 of the liver and flow into the inferior vena cava (IVC) in 72 (18%) cases. In 22 (5.5%) cases, the MRHV was found to drain segment 5 of the liver and flow into the IVC. The size of the IRHV ranged from 0.1 cm to 0.8 cm with an average of 0.46 cm. For the MRHV, the sizes ranged from 0.1 cm to 0.9 cm with an average of 0.34 cm. In 10/79 (12.6%) cases the IRHV and in 4/ 22 (18.1%) cases the MRHV were bigger than the right hepatic vein (RHV). The distance between the RHV and IRHV ranged from 3 cm to 5 cm with an average of 3.7 cm. The distance between the RHV and MRHV ranged from 3 cm to 3.3 cm with an average of 3.1 cm. A hyperechoic edge, similar to that of the portal vein, was observed at the wall of the hypertrophic IRHV and was 0.3 cm or larger in size. Preoperative delineation of this complex venous anatomy is very important. It provides vital information in the preoperative evaluation needed before performing a right subtotal hepatectomy with preservation of segment 6 or segment 5 of the liver, and with RHV resection. Prior to undertaking a right hepatectomy, clamping the hypertrophic MRHV and IRHV electively may minimize intra-operative blood loss and extrahepatic spread of the malignancy.

Cloning and characterization of rainbow trout (Oncorhynchus mykiss) somatolactin cDNA and its expression in pituitary and nonpituitary tissues

A cDNA clone encoding rainbow trout (Oncorhynchus mykiss) somatolactin (rtSL) has been isolated from a rainbow trout pituitary cDNA library. This 2329-bp cDNA clone includes a very short 7-bp 5'-untranslated region, a coding region of 702 bp, and a long 3'-untranslated region of 1620 bp. The deduced amino acid sequence of rtSL shows a polypeptide of 233 amino acid residues which consists of a 24-amino-acid putative signal peptide followed by a 209-amino-acid mature polypeptide. This mature polypeptide has a molecular weight of 24 kDa. The rtSL shares 99% amino acid identity with chum salmon SL (csSL) and approximately 53-77% amino acid identity with SLs in other fishes, including the 7 conserved cysteine residues. Although a glycosylation site has been identified in SL of other fish species, none is observed in rtSL polypeptide. The level of rtSL mRNA in a single pituitary gland was determined by RNA blot hybridization. Results showed that levels of SL mRNA in pituitary glands of 2-year-old fish were 4- to 7-fold higher than those of 1-year-old fish. The tissue distribution of SL gene expression in adult fish was determined by reverse transcription-polymerase chain reaction (RT-PCR) and DNA blot hybridization. In addition to the pituitary gland, SL mRNA was detected in all tissues examined including brain, gill, heart, kidney, liver, skeleton muscle, spleen, ovary, testis, and immature oocytes. The extrapituitary expression of the SL gene was also detected in embryos and fry. The PCR products which contained the region coding for mature SL from heart and kidney were cloned and characterized. Nucleotide sequence analysis showed that the SL mRNAs in heart and kidney were identical to that in the pituitary gland. These results suggest that, although the pituitary gland is the predominant tissue for producing SL, it is not the only tissue that SL gene is expressed in, and the extrapituitary expression of rtSL gene starts from very early developmental stages.

Characterization of rainbow trout (Oncorhynchus mykiss) growth hormone 1 gene and the promoter region of growth hormone 2 gene

Studies by Agellon et al. (Mol. Reprod. Dev. 1, 11-17) showed the presence of two growth hormone (rtGH1 and rtGH2) mRNA species in pituitary glands of adult rainbow trout (Oncorhynchus mykiss). In this study, we have detected rtGH1 and rtGH2 mRNAs in pituitary glands of rainbow trout from fry to 2 years of age. The level of rtGH1 mRNA is notably higher than that of rtGH2 mRNA in 10-day-old fry and 2-year-old females. These results suggest differential expression of rtGH1 and rtGH2 genes in different sexes and developmental stages. As a step toward elucidating the mechanism of differential expression of both GH genes, DNA fragments encoding rtGH1 gene and the promoter/regulatory region of rtGH2 gene were isolated and characterized. Rainbow trout GH genes span approximately 4.5 kb and are composed of six exons and five introns. The 5'-flanking region of both genes contain consensus sequences for TATA boxes and several Pit-1 binding sequences. Consensus sequences related to the cAMP response element, thyroid hormone response element, retinoic acid response element, estrogen response element (ERE), and glucocorticoid response element are present not only in the 5'-flanking region, but also in introns and exons in rtGH1 gene. These hormone response elements, except ERE, are also present in rtGH2 gene.

The Xanthomonas campestris gumD gene required for synthesis of xanthan gum is involved in normal pigmentation and virulence in causing black rot

A cloned 4.1-kb EcoRI fragment from Xanthomonas campestris pv. campestris was previously shown to complement the non-mucoid mutant P22 and increase xanthan gum production after being transformed into the wild-type strain Xc17. The gene responsible for these effects was identified, sequenced, and shown to be the gumD gene which has previously been proposed to encode glucose transferase activity, an enzyme required for adding the first glucose residue to the isoprenoid glycosyl carrier lipid during xanthan synthesis. A gumD mutant, isolated from Xc17 by gene replacement, was shown to possess altered pigment xanthomonadin profiles and exhibit reduced virulence in causing black rot in broccoli. This study appears to be the first to demonstrate that interruption of a gene required for xanthan synthesis can lead to reduced virulence of X. campestris.

[Effects of ginkgo leave concentrated oral liquor in treating asthma]

OBJECTIVE

To determine the effects of Ginkgo leave concentrated oral liquor (GLC) on airway inflammation.

METHODS

Airway hyperreactivity and clinical symptoms and pulmonary functions of asthma patients were determined.

RESULTS

In contrast to placebo group, GLC significantly reduced airway hyperreactivity (P < 0.05) and improved clinical symptoms (P < 0.05), pulmonary functions (P < 0.05) of the asthmatic patients.

CONCLUSION

GLC is an effective drug of anti airway inflammation.

The structure of stewartan, a capsular polysaccharide produced by Erwinia stewartii strain DC283

Stewartan is a capsular polysaccharide produced by Erwinia stewartii, the causative agent of Stewart's wilt of maize. The structure of stewartan is shown, by a combination of methylation analysis, Li/ethylenediamine degradation, 1D and 2D NMR spectroscopy, partial acid hydrolysis and isolation of oligosaccharides, Smith degradation, MALDI-TOFMS analysis and exoglycosidase digestion, to have the following repeating unit: [sequence: see text]

Comparison of extracellular polysaccharides of Erwinia chrysanthemi spp

Two extracellular polysaccharides from strains of Erwinia chrysanhemi Ech 1 and 9, phytopathogens of potatoes, have been isolated and purified. Both have similar compositions and other properties to that produced by strain SR 260, a phytopathogen of corn. These polysaccharides are composed of L-rhamnose, D-mannose, D-glucose, D-glucuronic acid in the ratio 3:1:1:1. Initial structural aspects of these polysaccharides are reflected in the 600 MHz 1H NMR spectra and the products of partial acid hydrolysis, which are presented for comparison.

The glycans of horseradish peroxidase

Horseradish peroxidase (E.C. 1.11.1.7) isozyme c (HRPc) is a glycoprotein found to contain 21.8% carbohydrate with the average composition: 2 mol GlcNAc, 2.6 mol Man, and 0.8 mol each of Fuc and Xyl. The oligosaccharides of HRPc were investigated by a combination of High pH Anion-Exchange Chromatography with Pulsed Amperometric Detection, methylation analysis and Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. The structure of the major oligosaccharide released by digestion with glycopeptidase A, accounting for between 75 and 80% of the total, was confirmed to be [sequence: see text]. Most of the remaining oligosaccharides were found to belong to the (Xyl)xManm(Fuc)fGlcNAc2 (m = 2, 4, 5, 6; f = 0 or 1; x = 0 or 1) family. Less than 5% of the oligosaccharides were of the ManmGlcNAc2 (m = 4 to 7) type. Methylation analysis of holo- and apo-HRPc and its tryptic glycopeptides support the structures proposed for the oligosaccharides. Furthermore, methylation analysis of the tryptic glycopeptides provides evidence for the heterogeneity of the oligosaccharides occurring at each of the N-linked sites.

Calcium pyrophosphate dihydrate crystal deposition disease: frequency of tendon calcification about the knee

OBJECTIVE

To delineate the prevalence of tendon and cartilage calcification as well as its possible predilection for age, sex, or side of involvement in calcium pyrophosphate dihydrate (CPPD) crystal deposition disease of the knee.

METHODS

We reviewed 225 lateral knee radiographs from 138 patients (M/F: 85/52, 1 unspecified sex, mean age: 73 yrs) to document quadriceps and gastrocnemius tendon calcification. Chondrocalcinosis of the knee was evaluated on 275 knee radiographs (lateral and anteroposterior projection) from 153 patients (M/F: 97/55, 1 unspecified sex, mean age: 73 yrs) to determine the frequency of meniscal and hyaline cartilage calcification.

RESULTS

Gastrocnemius tendon calcification was found in 28.4% of knees, which is significantly more common than quadriceps tendon calcification (8.4%). No significant age or laterality difference existed for calcification of either tendon. Quadriceps tendon calcification was more prevalent in men, but no sex difference was present for the gastrocnemius tendon. Calcification of either tendon never occurred without associated chondrocalcinosis. Meniscal calcification was significantly more prevalent than hyaline cartilage calcification; meniscal calcification also was significantly more frequent in men. Increased prevalence of calcification with age was observed in hyaline cartilage but not in the menisci.

CONCLUSION

Gastrocnemius tendon calcification is not infrequent in CPPD crystal deposition disease of the knee; identification of such calcification may further delineate this extent of the disorder.

The glycans of soybean peroxidase

Soybean hull peroxidase (SBP, E.C. 1.11.1.7), an anionic glycoprotein, was found to contain 18.2% carbohydrate with the average composition: 2 mol GlcNAc, 3.3 mol Man, 0.9 mol Fuc, and 0.7 mol Xyl. The oligosaccharides of SBP, after release with glycopeptidase A, were investigated by a combination of high pH anion exchange chromatography with pulsed amperometric detection, methylation analysis and matrix assisted laser desorption/ionization-time-of-flight mass spectrometry. The structure of the major oligosaccharide, accounting for 60 to 65% of the total, is Man alpha 1-->6(Man beta 1-->3)(Xyl beta 1-->2)Man beta 1-->4GlcNAc beta 1-->4(Fuc alpha 1-->3)GlcNAc. A further 20 to 25% of the released oligosaccharides belong to the (Xyl)xManm(Fuc)fGlcNAc2 (m = 2, 4, 5, 6; f = 0 or 1, x = 0 or 1) family. The rest of the oligosaccharides were of the high-mannose type. Investigation of the six tryptic fractions containing carbohydrate revealed considerable heterogeneity in the N-linked oligosaccharides present in each fraction. The major glycan (4, Table III) was present in each fraction. Two of the fractions contained the major part of the high-mannose type glycans, ManmGlcNAc2 (m = 5-9), the major species being Man7GlcNAc2. The other four fractions contained mainly members of the (Xyl)xManm(Fuc)fGlcNAc2 (m = 2, 4, 5, 6; f = 0 or 1; x = 0 or 1) family. Methylation analysis of the holo- and apo-SBP provide support for the structures proposed for the oligosaccharides as well as for the heterogeneity of the glycopeptide fractions.

Nimodipine facilitates retention of the classically conditioned nictitating membrane response in aged rabbits over long retention intervals

Aged rabbits initially underwent 18 days of acquisition of the classically conditioned nictitating membrane response (NMR) using a tone conditioned stimulus (CS) and an air puff unconditioned stimulus (UCS). They were then treated with a low or high dose of nimodipine or a vehicle for 90 days. During this time no further CS-UCS pairings were presented. They underwent testing for retention of the conditioned response (CR) at 30 and 90 days. Retention testing consisted of 20 presentations of the CS alone. Rabbits in the control condition retained 46.4% of their predrug levels of conditioned responding and rabbits receiving the low dose of nimodipine retained 37.3% of their predrug levels after 30 days. After 90 days, retention in these animals declined to 8.1% and 14.1%, respectively. In contrast, rabbits receiving the high dose of nimodipine retained 85% of their predrug learning at 30 days with little decline at 90 days (77.1%). Nonassociative factors such as sensitivity to the CS or UCS could not explain these effects.