THE ORIGIN OF AN ORGAN: PHYLOGENETIC ANALYSIS OF EVOLUTIONARY INNOVATION IN THE DIGESTIVE TRACT OF FLIES (INSECTA: DIPTERA)

The cardia, a prominent digestive tract organ consisting of several specialized cell types, occurs throughout the “higher” or muscoid flies, division Schizophora of order Diptera. Phylogenetic analysis of cellular organization in 65 insect species from 36 families indicates that this organ originated within the order Diptera from ancestrally undifferentiated tissues. “Lower” flies, suborder “Nematocera,” display little or no epithelial cell specialization at the corresponding site. Scorpionflies of the outgroup order Mecoptera are similarly unspecialized. Intermediate levels of cellular specialization occur in Tabanomorpha, Asilomorpha and Aschiza, dipteran taxa that diverge between “Nematocera” and Schizophora. The distribution of epithelial characteristics suggests that the cardia evolved through a sequence of simple tissue transformations, combining changes in epithelial configuration with local differentiation of cell structure and function. The evolution of locally specialized cell types implies the emergence of structural genes and regulatory mechanisms through the modification of an ancestral genome that had not supported such extensive differentiation. Comparison of localized gene expression in Drosophila melanogaster with that in other fly species having greater or lesser degrees of cell specialization may provide a practical model system for studying specific patterns of mutation associated with such evolutionary innovation.     

Susceptibility of the Bombyx mori cardia cells to Nucleopolyhedrovirus, multiple subgroup, BmMNPV

Bombyx mori entomopathogenic virus infection is a serious problem for silk production in tropical regions. Here, we investigate the susceptibility of the B. mori cardia epithelial cells to B. mori Nucleopolyhedrovirus, BmMNPV. Results show that cardia cells are susceptible to BmMNPV and that the cytopathology is similar to that in other target cells. The infection was detected at 6 day post-inoculation. This infection time, together with the protected cover intima, suggests that the cardia region is a secondary target, infected by budded virus.     

三种术式重建食管治疗食管癌和贲门癌的临床研究

目的:提高食管癌和贲门癌的根治切除率和临床治愈率,预防吻合口瘘。方法:设计了Ⅰ、Ⅱ、Ⅲ三种术式:上、中段食管癌采用右胸前外侧切口,经第3或4肋间开胸,左腹直肌旁或左肋弓下斜切口开腹和右颈部切口,保留2～3cm颈段食管,食管次全切除,贲门部或部分胃切除,在颈部食管胃端侧分层吻合(Ⅰ式)。中段食管癌采用左胸前外侧切口,经第4或第5肋间开胸,腹部切口同前,左颈部切口,保留3～4cm颈段食管,食管次全切除,部分胃切除,在左颈部食管胃端侧分层吻合(Ⅱ式)。贲门癌采用左胸前外侧切口,经第5或4肋间开胸,腹部切口同前,中段食管和近半胃或纵半胃切除,在主动脉弓下食管胃端侧分层吻合(Ⅲ式)。尽可能清除区域淋巴结,吻合口均用大网膜包盖加固。结果:食管癌和贲门癌总切除率92．1%(174/189),其中根治性切除率为75．1%(142/189),探查率(未切除)为7．9%(15/189),三种术式的总吻合口瘘发生率为4．0%(7/174),无围手术期死亡。结论:三种术式可提高根治性切除率,大网膜包盖加固吻合口可减少瘘的发生率,食管胃分层吻合法可降低吻合口狭窄的发生率,临床治愈率高,围手术期死亡率低。     

The cells of the rat gastric groove and cardia

The distal wall of the groove between the rat forestomach and glandular stomach is lined with a special type of columnar cells (CCGG) and with fibrillovesicular cells (FVC). The cardiac glands contain cardiac mucosa (CMC) and serous cells (CSC). The CCGG contain small mucous granules and special vesicles and tubules. The CMC are filled with large mucous granules and resemble mucous neck cells. The CSC are filled with large proteinaceous granules. The FVC are characterized by long microvilli, apical bundles of microfilaments and a complex "tubulovesicular system". The pattern of 3H-thymidine incorporation and the presence of immature and transitional forms indicate a possible origin of all the cell types concerned from a common undifferentiated precursor. The membranes of the tubulovesicular system of FVC as well as the apical cell membrane were reactive to Thiéry's carbohydrate stain. However, lanthanum tracing of the extracellular space and ultrastructural stereoscopy did not reveal a permanent continuity between both membrane systems. The absence of 3H-thymidine label showed that FVC were not proliferative. The structural characteristics of FVC do not account for a secretory, resorptive or receptive function. The special arrangement of microfilaments and the tubulovesicular system suggests an ability to fast changes in surface area.     

贲门癌及食管癌外周血免疫调节因子TGF-β1和IL-10及相关抗原自身抗体的变化及临床意义

目的 检测免疫调节因子及相关抗原自身抗体在食管癌和贲门癌患者外周血的变化,分析其临床意义。方法 选择本院2015年1月—2016年11月食管癌和贲门癌89例,作为病例组,临床TNM分期：T1级18例,T2级21例,T3级患者27例,T4级23例。选取同期体检健康人群110例,作为正常组。检测血清免疫调节分子TGF-β1、IL-10浓度和anti-CD25 IgG、anti-FOXP3 IgG抗体水平。结果 病例组患者治疗前血清TGF-β1、IL-10浓度和anti-CD25 IgG、anti-FOXP3 IgG分别为（375.36±28.16）pg/mL、（32.51±3.73）pg/mL和（2.43±0.26）mg/L、（2.51±0.29）μg/L,均高于对照组,差异有统计学意义（P＜0.05）;T3+T4患者治疗前TGF-β1、IL-10浓度和anti-CD25 IgG、anti-FOXP3 IgG分别为（461.64±31.29）pg/mL、（38.60±4.21）pg/mL和（2.70±0.21）mg/L、（2.69±0.30）μg/L,均高于T1+T2患者,差异有统计学意义（P＜0.05）,患者治疗后TGF-β1、IL-10浓度和anti-CD25 IgG、anti-FOXP3 IgG分别为（180.94±23.15）pg/mL、（22.76±4.29）pg/mL和（1.38±0.23）mg/L、（1.77±0.25）μg/L,均低于治疗前,差异有统计学意义（P＜0.05）。结论 食管癌和贲门癌患者外周血中TGF-β1、IL-10浓度和anti-CD25 IgG、anti-FOXP3 IgG显著升高,并随着分期的增加而升高,患者经治疗后降低,在食管癌和贲门癌的发生、发展及结局中具有重要意义。     

Trends in age-standardised net survival of stomach cancer by subsite and stage: A population-based study in Osaka,Japan, 2001-2014

IntroductionThe burden of stomach cancer remains high, particularly among Asian countries. Although Japan is known to achieve high survival from stomach cancer, little is known regarding the survival trends for recent years and survival by subsite and stage. We report age-standardised 1-, 3-, 5- and 10-year net survival for patients diagnosed with stomach cancer in Osaka, Japan.MethodsWe analysed patients diagnosed with primary stomach cancer and registered in the population-based cancer registry in Osaka Prefecture between 2001 and 2014. We used the non-parametric Pohar Perme method to derive net survival for each year. Both cohort and period approaches were used. Age was standardised using weights of the external population of the International Cancer Survival Standard. Multiple imputation was applied to handle missing information on subsite and stage before estimating age-standardised net survival by subsite (cardia and non-cardia) and stage (localised, regional and distant metastasis). We then examined general trends in the cohort-based survival estimates, as well as by subsite and stage, using linear regression.ResultsA total of 97,276 patients were included in the analysis. Age-standardised net survival improved steadily (mean annual absolute change ≥1.2%). Net survival for both subsites improved, but cardia cancer showed 7–23% lower survival than non-cardia cancer throughout the study period. Five-year net survival remained high (≥80%) in the localised stage from the beginning of this study. Net survival increased steeply (≥1.4% per year) in the regional stage. Although 1-year net survival increased by 14% in the distant stage, 5-year and 10-year net survival remained below 10%.ConclusionAge-standardised net survival for stomach cancer in Japan improved during the study period owing to an increase in the number of patients with localised stage at diagnosis and improved treatment. Monitoring both short- and long-term survival should be continued as management of stomach cancer progresses.     

Small heat shock proteins are necessary for heart migration and laterality determination in zebrafish

Small heat shock proteins (sHsps) regulate cellular functions not only under stress, but also during normal development, when they are expressed in organ-specific patterns. Here we demonstrate that two small heat shock proteins expressed in embryonic zebrafish heart, hspb7 and hspb12, have roles in the development of left–right asymmetry. In zebrafish, laterality is determined by the motility of cilia in Kupffer's vesicle (KV), where hspb7 is expressed; knockdown of hspb7 causes laterality defects by disrupting the motility of these cilia. In embryos with reduced hspb7, the axonemes of KV cilia have a 9+0 structure, while control embyros have a predominately 9+2 structure. Reduction of either hspb7 or hspb12 alters the expression pattern of genes that propagate the signals that establish left–right asymmetry: the nodal-related gene southpaw (spaw) in the lateral plate mesoderm, and its downstream targets pitx2, lefty1 and lefty2. Partial depletion of hspb7 causes concordant heart, brain and visceral laterality defects, indicating that loss of KV cilia motility leads to coordinated but randomized laterality. Reducing hspb12 leads to similar alterations in the expression of downstream laterality genes, but at a lower penetrance. Simultaneous reduction of hspb7 and hspb12 randomizes heart, brain and visceral laterality, suggesting that these two genes have partially redundant functions in the establishment of left–right asymmetry. In addition, both hspb7 and hspb12 are expressed in the precardiac mesoderm and in the yolk syncytial layer, which supports the migration and fusion of mesodermal cardiac precursors. In embryos in which the reduction of hspb7 or hspb12 was limited to the yolk, migration defects predominated, suggesting that the yolk expression of these genes rather than heart expression is responsible for the migration defects.