Transcriptional regulation of interferon gamma gene by p300 co-activator

Interferon gamma (IFN gamma) is an important immunoreguratory protein and is secreted from CD4+, CD8+ T cells and NK cells. Expression of IFN gamma gene is regulated by either DNA-methylation or cis-elements of transcriptional factors such as AP-1, NFAT, AP-4, YY-1, ATF and GATA. At a putative ATF binding site in a promoter region of IFN gamma gene, the position from -59 to -43, is important for the IFN gamma promoter activity. Our gel-shift competition studies demonstrated that addition of antibodies against ATF-2 caused super-shifts of DNA-protein complexes. In addition, it was clarified that p300 was involved in DNA-protein complexes by in vitro "pull-down" experiments. Moreover, a co-expression of p300 and ATF-2 enhanced the promoter activity of IFN gamma gene. Thus, these results indicate that p300 and ATF-2 play critical rules in a basal transcription of IFN gamma gene in Jurkat T cells.

Biofilm formation of Candida albicans on the surfaces of deteriorated soft denture lining materials caused by denture cleansers in vitro

Candidal colonization and subsequent biofilm formation on denture materials are important in the development of pathogenesis, such as denture stomatitis. Routine use of denture cleansers is one of the most effective methods of denture plaque control, although the incompatibility of soft liners and denture cleansers cause damage to the materials. The present study, biofilm formation of Candida albicans on the surfaces of soft denture lining materials, immersed in denture cleansers for 180 days were studied. Seven commercially available soft denture lining materials, were artificially deteriorated by immersion into three commercially available denture cleansers for 180 days, and subsequent fungal growth and biofilm formation were studied by measuring pH of the media and by the use of adenosine triphosphate (ATP) analysis. Fungal biofilm formation on the deteriorated soft liners varied depending upon the combination of the soft liners and denture cleansers. Several combinations of soft liners with denture cleansers exhibited the significantly high colonization capacity as compared with each sample immersed in distilled water, used as individual controls. The relationship between the biofilm formation on the samples of each material and the surface roughness of the soft lining materials was analyzed. However, no significant correlation was observed. The results, taken together, suggested that fungal colonization could be predominantly regulated by the combination of lining material with denture cleansers. In clinical terms, our findings suggests that daily cleansing of soft lining materials with mismatched denture cleansers promoted the subsequent biofilm formation of fungi on the materials.

Changes in surface roughness and colour stability of soft denture lining materials caused by denture cleansers

Soft denture lining materials were immersed into solutions of denture cleansers for 8 h at room temperature, and immersed into distilled water for the remainder of the 24-h period at 37 degrees C. Surface roughness of the soft denture lining materials was measured by contact type surface roughness instrument. For the colour stability test, soft denture lining materials were immersed in the denture cleansers as described above for 180 days. Finally, the colour changes of each material were quantitatively measured by a photometrical instrument to obtain the colour differences between newly processed specimen and immersed specimens (P < 0.01). An autopolymerizing silicone material, Evatouch, exhibited severe changes in surface roughness by all denture cleanser, and the generic material GC Denture Relining showed the minimal changes. Severe colour changes were also observed with some liner and cleanser combinations (P < 0.01). Except for Evatouth, the four silicone soft liners were more stable in surface roughness and in colour change than the two acrylic soft liners. One autopolymerizing silicone (GC denture relining) and one heat curing silicone (Molloplast B) demonstrated the best stability.

Centrosomal abnormalities, multipolar mitoses, and chromosomal instability in head and neck tumours with dysfunctional telomeres

Carcinomas of the head and neck typically exhibit complex chromosome aberrations but the underlying mutational mechanisms remain obscure. Evaluation of cell division dynamics in low-passage cell lines from three benign and five malignant head and neck tumours revealed a strong positive correlation between multipolarity of the mitotic spindle and the formation of bridges at anaphase in both benign and malignant tumours. Cells exhibiting a high rate of mitotic abnormalities also showed several chromosome termini lacking TTAGGG repeats and a high frequency of dicentric chromosomes. Multicolour karyotyping demonstrated a preferential involvement in structural rearrangements of chromosomes with deficient telomeres. The majority of malignant, mitotically unstable tumours expressed the reverse transcriptase subunit of telomerase. These data indicate that some of the genomic instability in head and neck tumours is initiated by telomere dysfunction, leading to the formation of dicentric chromosomes. These form chromosome bridges at mitosis that could prevent the normal anaphase-telophase transition. In turn, this may cause an accumulation of centrosomes and mitotic multipolarity. Telomerase expression does not confer total stability to the tumour genome but could be crucial for moderating the rate of chromosomal evolution.

Synthesis and binding affinities of 2 beta-(3-iodoallyloxycarbonyl)-3 beta-(4-substituted-aryl)tropane analogues as ligands for the dopamine transporter studies

Tropane analogues from cocaine, which is known to be one of the most reinforcing and addictive compounds, were designed, synthesized, and characterized for inhibition of presynaptic uptake of dopamine (DA) in brain. Eight new derivatives of 3 beta-aryl-2 beta-(3-iodoallyloxycarbonyl)tropanes were synthesized and tested for their potential abilities to displace [(3)H]2 beta-carbomethoxy-3 beta-(4-fluorophenyl)tropane (WIN 35,428) binding to the rat striatal membranes.

Nonrandom karyotypic features in basal cell carcinomas of the skin

Cytogenetic analysis of short-term cultured 44 basal cell carcinomas (BCC) revealed clonal karyotypic abnormalities in 38 tumors. Relatively complex karyotypes (at least four structural and/or numerical changes per clone) with unbalanced structural as well as numerical aberrations were found in eight (approximately 21%) of the BCC, while the remaining BCC (79%) had simple karyotypes (1 to 3 aberrations per clone). Numerical changes only were found in 16 tumors, 15 BCC displayed both numerical and structural aberrations, and the remaining 7 BCC showed only structural aberrations. Extensive intratumoral heterogeneity, in the form of cytogenetically unrelated clones, was found in 21 tumors, whereas related subclones were present in 10 tumors. In order to obtain an overall karyotypic picture in BCC, the findings of our previously published 25 BCC have been reviewed. Our combined data indicate that BCC are characterized by nonrandom karyotypic patterns. A large subset of BCC is characterized by nonrandom numerical changes, notably, +18, +X, +7, and +9. Structural rearrangements often affect chromosomes 1, 4, 2, 3, 9, 7, 16, and 17. A number of chromosomal bands are frequently involved, including 9q22, 1p32, 1p22, 1q11, 1q21, 2q11, 4q21, 4q31, 1p36, 2q37, 3q13, 7q11, 11p15, 16p13, 16q24, 17q21, and 20q13. When the genomic imbalance is assessed, it has been shown that several chromosome segments are repeatedly involved in losses, namely loss of the distal part of 6q, 13q, 4q, 1q, 8q, and 9p. A correlation analysis between the karyotypic patterns and the clinico-histopathologic parameters has been undertaken in the 44 BCC of the present series. The cytogenetic patterns show a significant correlation with tumor status (P=.025), that is, that cytogenetically more complex tumors are also those clinically the most aggressive. Also, the frequency of cytogenetically unrelated clones is significantly higher in recurrent BCC than that in primary lesions (P=.05). No clear-cut association has been found between the karyotypic patterns and histologic subtypes or tumor sites.

Improvement of generalization ability for identifying dynamical systems by using universal learning networks

This paper studies how the generalization ability of models of dynamical systems can be improved by taking advantage of the second order derivatives of the outputs with respect to the external inputs. The proposed method can be regarded as a direct implementation of the well-known regularization technique using the higher order derivatives of the Universal Learning Networks (ULNs). ULNs consist of a number of interconnected nodes where the nodes may have any continuously differentiable nonlinear functions in them and each pair of nodes can be connected by multiple branches with arbitrary time delays. A generalized learning algorithm has been derived for the ULNs, in which both the first order derivatives (gradients) and the higher order derivatives are incorporated. First, the method for computing the second order derivatives of ULNs is discussed. Then, a new method for implementing the regularization term is presented. Finally, simulation studies on identification of a nonlinear dynamical system with noises are carried out to demonstrate the effectiveness of the proposed method. Simulation results show that the proposed method can improve the generalization ability of neural networks significantly, especially in terms that (1) the robust network can be obtained even when the branches of trained ULNs are destructed, and (2) the obtained performance does not depend on the initial parameter values.

Cytogenetic and fluorescence in situ hybridization characterization of chromosome 8 rearrangements in head and neck squamous cell carcinomas

Structural rearrangements of chromosome 8 are frequently encountered in squamous cell carcinomas of the head and neck (HNSCC). These aberrations often affect the centromeric region, resulting in the formation of isochromosome i(8q) and whole arm translocations. Some tumors may display structural rearrangements of 8p23. To characterize further the localization of the breakpoints in such rearrangements, 12 HNSCC known to carry pericentromeric rearrangements of chromosome 8 and 8p23 abnormalities were investigated with fluorescence in situ hybridization (FISH) by the use of 15 YAC clones spanning 8p23 and 8p11 to 8q11. FISH confirmed that all, except one, aberrations cytogenetically interpreted to be i(8q) were true, monocentric i(8q). Similarly, all whole-arm translocations appeared as centric fusions. It could thus be concluded that the essential outcome of these rearrangements is genomic imbalances and not rearrangement of genes in the pericentromeric region. By the use of five YAC clones mapping to 8p23, different breakpoints at the molecular level were disclosed in cases with cytogenetically identical 8p23 rearrangements. An evaluation of the genomic imbalances detected in the present series revealed that overrepresentation of 8q material was present in 11 of the 12 tumors. The most commonly gained segment was 8q22 approximately qter, found in all cases with 8q overrepresentation. Loss of parts of or the entire 8p was seen in 10 tumors. The smallest overlapping deleted region was localized to the subtelomeric region of 8p.

Alteration of the coadherence of Candida albicans with oral bacteria by dietary sugars

Interactions between bacterial oral flora and Candida albicans are important in denture plaque formation. This study therefore first aimed to quantify the coadherence of C. albicans and bacteria by the use of a bioluminescent adenosine triphosphate (ATP) assay based on the firefly luciferase-luciferin system. The second aim was to examine the effect of i) dietary sugars (used for preculture) and ii) enzymatic digestion of fungi on the coadherence. When yeast was preincubated in yeast nitrogen base medium (YNB) supplemented with 250 mM glucose, the yeast coadhered with all isolates of Streptoccus mutans and Streptococcus sanguis, and no significant coadhesion was observed with the isolates of Streptococcus sobrinus, Streptococcus salivarius, Lactobacillus and Actinomyces. However, when the yeast was precultured in YNB supplemented with 500 mM galactose, the yeast coadhered with S. salivarius and Actinomyces, which was not observed when the yeast was grown in YNB with glucose. In addition, the coadherence of the yeast with the isolates of S. sanguis was significantly reduced. Enzymatic digestion of yeast and a reverse transcription polymerase chain reaction assay revealed that expression of at least two types of proteinaceous adhesins are involved in these phenomena.

Peroxynitrite leads to arteriolar smooth muscle cell membrane hyperpolarization and low vasoreactivity in severe shock

This paper aimed to study the mechanism of vascular hyporeactivity during severe hemorrhagic shock. Rats were divided into control and shock group. Membrane potential of arteriolar strips was measured with intracellular recording method and membrane potential changes in arteriolar smooth muscle cells (ASMC) were recorded with membrane potential sensitive fluorescent dye (DiBAC4) and confocal microscopy. Hyperpolarization of ASMC membrane appeared at the late stage of shock, which correlated to low vasoreactivity. Glybenclamide, an inhibitor of K(ATP) channel reversed the hyperpolarizing effect. S-nitroso-N-acetylpenicillamine (SNAP), a donor of NO, in a higher concentration (400 mol/l) caused membrane hyperpolarization in control and shock group, which was completely reversed by application of Tiron, a scavenger of O2-. The hyperpolarizing effect of SNAP was decreased by ODQ, glybenclamide and (or) charybdotoxin. It is concluded that hyperpolarization of ASMC leads to vascular hyporeactivity. Peroxynitrite (OONO-) involves in the development of hyperpolarization in severe shock. The production of cGMP and activation of K(ATP) and K(Ca) channel contribute to the hyperpolarizing effect of OONO-*.

Processing procedures of brick tea and their influence on fluorine content

China is the only country that produces brick tea, and more than 90% of the brick tea is consumed in the western minority nationality regions of China. The high fluorine content of brick tea is possibly associated with the special processing procedures, but no investigation has been conducted in this field. To explore the characteristic features of brick tea manufacturing and the alterations in fluorine content during the processing procedures, we performed a field survey involving two brick tea factories and the nearby tea plantations. For the fluorine contents of the initial, intermediate and final processing products, altogether eight types of specimens were collected and determined by using the ion-selective electrode standard curve technique. It was found that the raw material tea leaf for brick tea processing was old, coarse and not the tender delicate tea leaf used for ordinary green or black tea processing. For the fluorine content of the raw material tea leaf, the intermediate and the final products showed that the fresh raw leaf contained a fluorine content as high as 489.31-512.68 mg/kg. During one fermentation-like processing procedure, the fluorine content rose by 4.67% and 1.88% in the specimens from the two factories, respectively, which revealed no statistical significance (P>0.5). These results suggest that the high fluorine content in brick tea might be due to the high content in the raw material and not related with the processing procedures.

[Electric pulse mediated high efficient gene transfer]

OBJECTIVE

To study gene transfer mediated by electric pulse and optimize the parameters of electric pulse in vivo.

METHODS

10 micrograms plasmid pcD2/LacZ was injected into the quadriceps of 220 Kunming mice. One to two minutes after the DNA injection electric pulse with different parameters was given to the injection site. Three days after, activity of beta-galactosidase was measured, and the expression of Laz2 gene in muscle was determined by histochemical staining.

RESULTS

The activity of beta-galactosidase in electric pulse group (131.6 U/mg +/- 86.6 U/mg protein) was 30 fold higher than that in direct injection group (4.9 U/mg +/- 1.0 U/mg protein) (P < 0.05). Histochemical analysis of muscles injected with a LacZ expression plasmid also showed that in vivo electric pulse increased both the number of positively stained muscle fibers and the density of staining. When the electric pulse was with the parameters of 200 V/cm, 40 ms, 6 pulses and 1HZ, maximal gene expression was achieved.

CONCLUSION

Electric pulse, with optimal parameters, increases gene expression. Electric pulse makes much more gene expression than mere intramuscular DNA injection.

[Apoptosis of pancreatic acinar and expression of TNF-alpha mRNA, IL-10 mRNA in rats with acute pancreatitis]

OBJECTIVE

To investigate the apoptosis of pancreatic acinar and the expression of TNF-alpha mRNA, IL-10 mRNA in pancreatic tissue of rats with acute pancreatitis.

METHODS

The model of acute edematous pancreatitis(AEP) was established in 20 rats and that of acute necrotizing pancreatits(ANP) in another 20 by injection of sodium taurocholate into the pancreatic duct. Another 10 normal rats were used as controls. At 12 hours after the induction of pancreatitis, 10 rats in each group were sacrificed. Serum and pancreatic TNF-alpha and IL-10 levels were measured. The expression of TNF-alpha and IL-10 mRNA in pancreas was detected and the apoptotic rate of pancreatic acinar determined.

RESULTS

The apoptotic rate of pancreatic acinar in normal, AEP and ANP groups was 2.98%, 17.29% and 8.39%, respectively. TNF-alpha and IL-10 levels increased after the induction of acute pancreatitis. The level of TNF-alpha was lower while that of IL-10 higher in AEP group than in ANP group. Transcription level of TNF-alpha mRNA in ANP group and that of IL-10 mRNA in AEP group were upregulated.

CONCLUSIONS

The transcription levels of TNF-alpha and IL-10 mRNA in pancreatic tissue of rats with acute pancreatitis are positively correlated with their levels in serum and pancreas, suggesting that the pancreas is the organ to release cytokines. The apoptotic rate of pancreatic acinar is negatively correlated with the severity of disease and apoptosis may be a benign response to pancreatic injury.

Matrine inhibits production and actions of fibrogenic cytokines released by mouse peritoneal macrophages

AIM

To study the effects of matrine (Mat) on production and actions of fibrogenic cytokines from mouse peritoneal macrophages.

METHODS

Mouse peritoneal macrophages were primed with calcimycin 1 micromol/L for 8 h then elicited by lipopolysaccharides (LPS) 100 microg/L for 6 h to induce fibrogenic cytokines. Proliferative and collagen stimulating activity in the macrophage culture supernatants was determined by crystal violet staining assay and [3H]-proline incorporation assay using rat hepatic stellate HSC-T6 cell or mouse fibroblast NIH3T3 cell. Transforming growth factor beta (TGFbeta) activity was measured by [3H]-thymidine incorporation assay using Mv-1-Lu mink lung epithelial cell.

RESULTS

Mat (0.5-2 mmol/L) was shown to significantly inhibit LPS-induced collagen stimulating activities and TGFbeta production (P < 0.01) whereas did not inhibit proliferative activities induced by macrophages. Macrophage conditioned medium (MCM)-driven proliferation and collagen synthesis of HSC-T6 cells as well as NIH3T3 cells were attenuated by Mat (0.5-2 mmol/L) in a concentration-dependent manner.

CONCLUSION

Antifibrotic effects of Mat on hepatic stellate cells may be related to reduction of fibrogenic cytokine production and blockade of their actions.

Antifungal activity of histatin-5 against non-albicans Candida species

Fungicidal effects of histatin-5 against 26 oral isolates belonging to 5 non-albicans Candida species were examined. Fifty microM of histatin-5 killed more than 95% of Candida tropicalis and Candida guilliermondii isolates and more than 90% of Candida parapsilosis and Candida krusei. However, Candida glabrata was less sensitive to the peptide (mean 62.9%). Our results, taken together, demonstrated that histatin-5 possessed the fungicidal activity against Candida species other than C. glabrata.

Candida albicans growth on thermal cycled materials for maxillofacial prostheses in vitro

In the present study, the growth of a single isolate of Candida albicans on saliva-, serum-coated or protein free (uncoated), thermocycled (4-70 degrees C for 1 min, respectively; 0, 1000 and 10 000 times) 15 commercial maxillofacial materials was investigated, by monitoring pH changes in growth media. The inhibitory effect of the tissue conditioners on fungal growth was analysed using three parameters viz: (i) delay in the onset of the rapid decline in pH (ii) reduction in the rate of pH change and (iii) the pH minima reached. In the case of control materials (non-thermocycled and uncoated), significant antifungal effect was observed with two products. However, the antifungal effect of the materials was significantly reduced both by thermal cycling (Analysis of covariance [ANOVA]; P < 0.01) and a layer of protein coating (saliva, P < 0.05; serum, P < 0.01). When the interrelation between three parameters of fungal growth and the surface hydrophobicity of the materials were analysed, minimum pH of fungal growth on 10 000-thermocycled materials correlated well with the contact angles of the materials (Student t-test, P < 0.01), suggesting that thermocycling process reduced the unpolymerized components of the materials which showed the antifungal effects, resulted in that the cell growth depends on the surface hydrophobicity of the specimens. These results, taken together, suggest that the ageing of the materials and the biological fluids of the host enhanced the fungal growth on maxillofacial materials.

A rare premalignant prostate tumor epithelial cell syndecan-1 forms a fibroblast growth factor-binding complex with progression-promoting ectopic fibroblast growth factor receptor 1

The abnormal appearance and age-dependent loss of resident fibroblast growth factor receptor-2 (FGFR2) and gain of activity of FGFR1 in epithelial cells is a hallmark of the slow progression to malignancy in some models of prostate cancer. Pericellular matrix heparan sulfate (HS) is an integral subunit of the FGFR tyrosine kinase complex that restricts activity in absence of FGF, facilitates binding of an activating FGF, and confers specificity for FGF isoforms. In this report, we isolated and purified HS proteoglycan (HSPG) from premalignant prostate tumor epithelial cells based on the ability of the HS chains to form a binary complex with immunoglobulin module II of the ectopic and progression-promoting FGFR1 that was competent to bind FGF. The FGFR1 affinity-purified product exhibited a specific activity of over 600 times that of crude cellular HSPG enriched from cell lysates by ion exchange chromatography. The purified preparation exhibited a single NH(2)-terminal sequence with 11 of 13 residues identical to syndecan-1. The activity of purified recombinant glutathione S-transferase-tagged syndecan-1 expressed in premalignant epithelial cells confirmed that syndecan-1 bears HS chains that exhibit the rare motif that forms the FGF-binding complex with ectopic FGFR1. These results are the first to identify by affinity purification a specific HSPG core protein, the HS chains of which act as an integral subunit of the FGFR complex. The results suggest that syndecan-1 provides HS chains in premalignant epithelial cells to both the FGFR2- and FGFR1-signaling complexes that are integral to their dual roles in progression to malignancy.

A novel chitinase having a unique mode of action from Aspergillus fumigatus YJ-407

Chitinases are produced throughout the growth process of fungi and are thought to play important roles in morphogenesis. Aspergillus fumigatus, is an important pathogen of immunocompromised individuals in which it causes pneumonia and invasive disseminated disease with high mortality; it is also known to produce chitinase. We have induced an exceptionally stable extracellular chitinase in A. fumigatus YJ-407, which could be isolated readily in a homogeneous form by using ammonium sulfate precipitation followed by DEAE-cellulose chromatography and preparative PAGE. The molecular mass of this chitinase was estimated to be 46 000 by SDS/PAGE, and its isoelectric point was pH 5.6. The enzyme was most active at pH 5.0 and 60 degrees C, and was inhibited strongly by Hg2+, Pb2+, Ag+, Fe2+, Mn2+ and Zn2+. The enzyme was stable over a broad pH range 4-8 and below 45 degrees C. Tryptophan and carboxyl groups were found to be essential for the enzyme activity. The Michaelis constants for swollen chitin and chitosan were 1.12 mg.mL-1 and 1.84 mg.mL-1, respectively. The enzyme showed maximum activity towards glycol chitin and partially deacetylated chitosan, and lower activity towards colloidal chitin. Analysis of the hydrolysis product showed that the enzyme has both endo- and exo-hydrolytic activities. In addition, a transglycosyl activity was also observed.

The effect of calcitonin gene-related peptide on pancreatic blood flow and secretion in conscious dogs

The effects of human alpha-calcitonin gene-related peptide (alpha-CGRP) and beta-CGRP on pancreatic arterial (PA), superior mesenteric (SMA) and left gastric arterial (LGA) blood flows were studied by ultrasound transit-time blood flow meters in five conscious dogs. Intravenous injections of alpha-CGRP and beta-CGRP (5-200 pmol/kg) induced a dose-related increase in PA flow and a dose-related decrease in its resistance. At lower doses, alpha-CGRP was more potent than beta-CGRP, but their maximal responses were similar. The blood flow responses to alpha-CGRP (200 pmol/kg) were 153% of the basal flow in LGA, 313% in PA, and 534% in SMA, while those to VIP (100 pmol/kg) were 467% in LGA, 953% in PA and 163% in SMA. Somatostatin reduced blood flow in all arteries. alpha-CGRP, but not beta-CGRP, at higher doses induced gastric contractions and pancreatic protein-rich secretion, which were blocked by atropine. These results suggest that CGRP in perivascular nerves in the pancreas may regulate pancreatic blood flow in dogs but its physiological function remains to be studied.

[Cloning and expression of maltooligosyltrehalose synthase from Sulfolobus acidocaldarius in Escherichia coli]

The gene of MTSase (maltooligosyltrehalose synthase) from Sulfolobus acidocaldarius ATCC49426 was amplified by PCR. The primers were designed according to the published sequence of homologous gene from Sulfolobus acidocaldarius ATCC33909. This gene was inserted into the plasmid pBV220 and the resultant recombinant plasmid pBV220-GT was transformed to E. coli DH5 alpha. The activity of recombinant enzyme was about 10 u/g(wet cell). In order to improve the expression level of target protein, some nucleotides in the 3' and 5' of the gene were modified to optimize the second structure of mRNA by PCR amplification using the new primers devised according to the biosoftware GOLDKEY2.0. As a result, the activity of recombinant enzyme increase to 19.8 u/g(wet cell). Then, the helping plasmid pUBS520 which carried the gene encoding the tRNA of rare codons AGG and AGA was transformed to the recombinant strain. But it took little effect.

Role of cholecystokinin in the intestinal phase of pancreatic circulation in dogs

The regulatory mechanisms of postprandial pancreatic hyperemia are not well characterized. The aim of this study is to clarify the role of cholecystokinin (CCK) in the intestinal phase of pancreatic circulation. Pancreatic, gastric, and intestinal blood flows were measured by ultrasound transit-time blood flowmeters in five conscious dogs. Pancreatic and gastric secretion and blood pressure were also monitored. Synthetic CCK octapeptide (CCK-8) or gastrin heptadecapeptide (gastrin-17) was infused intravenously, and milk was infused into the duodenum with or without loxiglumide, a specific CCK-A receptor antagonist. CCK-8 induced dose-related increases of pancreatic, but not gastric or intestinal, blood flow and protein secretion without affecting systemic blood pressure. Gastrin-17 did not affect pancreatic blood flow. An intraduodenal infusion of milk increased pancreatic and intestinal blood flows and pancreatic protein secretion. Loxiglumide completely inhibited pancreatic blood flow and protein responses to CCK-8 and milk but not the intestinal blood flow response. CCK is a potent and specific pancreatic vasodilator, with its effect mediated by CCK-A receptors. CCK plays an important role in the regulation of the intestinal phase of the pancreatic circulation in dogs.

[Non-invasive prenatal diagnosis of Duchenne muscular dystrophy]

OBJECTIVE

This paper was designed to investigate the feasibility of non-invasive prenatal diagnosis of Duchenne muscular dystrophy(DMD).

METHODS

The nucleated red blood cells(NRBC) were separated with percoll using a discontinuous density gradient method. The cells were smeared on microscope slides using a cyto-centrifuge and then stained by Wright- Giemsa. NRBCs were detected and individually retrieved into glass capillary pipettes using a micromanipulator under microscopic observation. The whole genome of a single cell was amplified by improved primer extension preamplification(PEP). The procedures for making prenatal diagnosis of DMD and determining the origin of NRBCs proceeded at the same time using sex determination and linkage analysis of several STR loci of dystrophin. Genotypes were analyzed by amplifying the 9 STR fragments using fluorescence-PCR technique and NRBCs origin was further determined.

RESULTS

A case of DMD in male fetus was diagnosed.

CONCLUSION

With the use of the method reported, the non-invasive prenatal diagnosis of DMD is possible.