Análise de assinaturas mutacionais no prognóstico de pacientes com adenocarcinoma gástrico e infecção por EBV / Mutational signature analysis in gastric cancer patients' prognosis and EBV infection

Adenocarcinoma gástrico (AdG) possui uma alta incidência na população mundial e brasileira. É um tipo tumoral cujos sintomas são bastante inespecíficos no seu início, resultando no diagnóstico já em estadios avançados. Recentemente, foi proposta uma nova classificação, estratificando o AdG em quatro subtipos, sendo um deles caracterizado pela infecção pelo Epstein Barr vírus (EBV). Neste subtipo, por sua vez, não são totalmente conhecidos os mecanismos subjacentes à infecção, os quais podem estar relacionados à instabilidade genômica e mecanismos adicionais de tumorigênese. Deste modo, o presente estudo fez uso de abordagens de Bioinformática para análise de dados públicos (TCGA) e sua validação no painel gênico de pacientes com AdG do A.C.Camargo Cancer Center, buscando assinaturas mutacionais relacionadas à instabilidade genômica na presença de EBV. A partir dos dados obtidos do consórcio TCGA, observamos expressão aumentada de APOBEC3s no subtipo molecular de AdG EBV positivo. Também foi possível ver maior taxa mutacional, no contexto TCW, nesse subtipo molecular, condizente com a ação de APOBECs. Na coorte do A.C.Camargo Cancer Center, foram obtidas amostras de tecido e de suco gástrico de 240 pacientes com AdG (caso) e 137 controles saudáveis. Nos pacientes caso, foi possível observar 6% de amplificação de fragmento de EBV na biópsia e 11,1% no Suco Gástrico. Os achados do TCGA foram validados na coorte do hospital, utilizando painel gênico. Foi possível cofirmar que a ação da família APOBEC3 está mais presente em amostras EBV positivas, indicando a ação viral na instabilidade gênica em AdG, através da família APOBEC

Gastric adenocarcinoma (GA) is highly frequent in the world and in Brazilian population. It's symptoms are rather nonspecific in the beginning, being diagnosed in advanced stages. Recently, a new classification was proposed, stratifying GA in four subtypes, one characterized by Epstein Barr Virus (EBV) infection. Yet, in this subtype, the underlying mechanisms of infection are not fully understood, which may be related to genomic instability and additional mechanisms of tumorigenesis. Thus, the present study made use of Bioinformatics approaches for public data analysis (TCGA) and its validation in the gene panel of A.C.Camargo Cancer Center patients with GA, searching for mutational signatures related to genomic instability in the presence of EBV. Analysing data from TCGA consortium, we observed increased expression of APOBEC3s in the EBV positive GA molecular subtype. It was also possible to observe a higher mutational rate, in TCW context, in GA with EBV infection, consistent with APOBECs action. In A.C.Camargo Cancer Center cohort, tissue samples and gastric juice were collected from 240 GA patients (case) and 137 healthy controls. It was possible to observe 6% EBV fragment amplification in biopsy and 11.1% in Gastric Juice. TCGA findings were validated in the hospital cohort, by gene panel. It was possible to confirm that APOBEC3 family members are more abundant in EBV positive samples, indicating a viral action in GA genomic instability through APOBEC3 members

Bases moleculares da absorção de nutrientes, tamponamento e fluxos de fluídos no intestino médio de Musca domestica / Molecular bases of nutrient absorption, buffering and fluid fluxes in the midgut of Musca domestica

O intestino dos insetos representa uma interface pouco protegida dos agentes externos. A identificação dos mecanismos moleculares envolvidos nos processos fisiológico-digestivos permite encontrar alvos potenciais para o controle de insetos. As moléculas envolvidas na absorção de nutrientes, tamponamento e geração de fluxos de água no intestino médio do inseto-modelo Musca domestica (Diptera Cyclorrhapha) foram identificadas. Para isso, foi feita uma análise da expressão gênica ao longo do intestino médio, a identificação e anotação de proteínas por bioinformática, a confirmação da localização apical das proteínas por análise proteômica de membranas microvilares purificadas e a determinação do papel de algumas das proteínas através de experimentos in vivo utilizando diferentes dietas, corantes e inibidores. A acidificação da região média é consequência da atividade anidrase carbônica que gera prótons que são bombeados por uma H+ V-ATPase apical acompanhados por cloreto transportado por um simporter K+Cl-. O K+ é recuperado por um canal de K+ e a homeostase dos cátions mantida pela Na+/K+-ATPase basolateral. O bicarbonato é eliminado basolateralmente em troca por cloreto por um antiporter. A acidificação é regulada diretamente por um antiporter Na+/H+ e indiretamente por uma proteína envolvida na homeostase do cobre. O muco protetor da região média é tamponado com bicarbonato gerado por uma anidrase carbônica com âncora de GPI e transportado por um antiporter Na+HCO3-/H+Cl-. O excesso de ácido é eliminado por um antiporter Na+/H+ situado na membrana basolateral. A alcalinização da região posterior ocorre pelo transporte apical de NH3 que sequestra os prótons luminais gerando amônio, junto à remoção de prótons em simporte com aminoácidos e peptídeos. A acidificação intracelular, consequência da entrada de aminoácidos com prótons, é regulada por uma H+ V-ATPase basolateral. A geração de fluxos de água é consequência da atividade conjunta de simporters NKCC e KCC ajudados pelas aquaporinas. A inibição dos simporters com inibidores específicos mostrou que o contrafluxo de água está envolvido na reciclagem da enzima tripsina. Por último, o principal lugar de absorção nutrientes no intestino médio é a região posterior, a exceção do cobre que é absorvido na região média

The gut of insects is a less protected interphase against external agents. The identification of the molecular mechanisms involved in physiological-digestive processes allows one to find potential targets for insect control. The molecules involved in nutrient absorption, buffering and fluid fluxes in the midgut of the insect-model M. domestica (Diptera Cyclorrhapha) were identified. For this, gene expression along the midgut was analyzed; proteins were identified and annotated by bioinformatics; apical localization of proteins was confirmed by proteomics of purified microvillar membranes; the role of proteins was confirmed by in vivo experiments using different diets, dyes and inhibitors. Middle midgut acidification occurs by the action of an apical H+ V-ATPase with protons coming from carbonic anhydrase activity accompanied by chloride transported with potassium by a K+Cl- symporter. Potassium is recovered by a potassium channel, and cation homeostasis maintained by a basolateral Na+/K+-ATPase. Acidification is directly regulated by a Na+/H+ antiporter and indirectly by a copper homeostasis protein. Mucus protecting epithelium is neutralized with bicarbonate generated by a GPI-ancored carbonic anhydrase and transported by a Na+HCO3-/H+Cl- antiporter. Intracellular acidification is avoided by a basolateral Na+/H+ antiporter. Posterior midgut alkalization occurs by the action of an apical ammonia transporter and proton amino acid (and peptide) symporters. Intracellular acid is eliminated by a basolateral H+ V-ATPase. Fluid fluxes are generated by K+Cl- and Na+Cl-Cl- symporters helped by aquaporins. Inhibition of these symporters showed that the countercurrent flux of water allows trypsin recycling. Finally, posterior midgut is the main location of nutrient absorption, except for copper which is absorbed in the middle midgut

Lipid regulation mechanism and dosage form selection of Xixian Tongshuan Preparation based on molecular simulation methods / 中国中药杂志

Atherosclerosis is the main cause of stroke, and dyslipidemia is the most important risk factor for atherosclerosis. In this paper, pharmacophore and molecular docking models of eight key lipid-lowering targets, namely NPC1 L1, HMG-CoA reductase, SQS, MTP, CETP, PPARα, LXRα and LXRβ, were used to screen out the small molecular database of traditional Chinese medicine(TCM), which was made up of ingredients of thirteen Chinese herbal medicines contained in Xixian Tongshuan Preparation. The screening results indicated that the preparation could showed an effect in regulating lipid on target NPC1 L1, HMG-CoA reductase, LXRβ and SQS through four groups of potential active compounds, namely prupersin A in peach kernel and suffruticoside A in gastrodiaelata, limocitrin-β-D-glucoside in Ligusticum chuanxiong, 2'-(2,3-dihydroxybenzoyl)-sweroside in Pinellia ternate and quercitrin in Panax notoginseng, 4-tert-butyl-2-[(5-tert-butyl-2-hydroxy-phenyl)methoxy-methyl]-6-(hydroxymethyl)phenol in Gastrodia elata. Moreover, the properties and extraction process of the most potentialactive compounds were consistent with the preparation process of Xixian Tongshuan Capsules, which indicated that the capsule had more advantages than the pill in the existing two dosage forms of Xixian Tongshuan Preparation. This study analyzed the pharmacodynamic basis and mechanism of Xixian Tongshuan Capsules in regulating lipid for treating stroke, and provided evidence for its further research and clinical application.

Network pharmacology-based analysis of Chinese herbal Naodesheng formula for application to Alzheimer's disease / 中国天然药物

Naodesheng (NDS) formula, which consists of Rhizoma Chuanxiong, Lobed Kudzuvine, Carthamus tinctorius, Radix Notoginseng, and Crataegus pinnatifida, is widely applied for the treatment of cardio/cerebrovascular ischemic diseases, ischemic stroke, and sequelae of cerebral hemorrhage, etc. At present, the studies on NDS formula for Alzheimer's disease (AD) only focus on single component of this prescription, and there is no report about the synergistic mechanism of the constituents in NDS formula for the potential treatment of dementia. Therefore, the present study aimed to predict the potential targets and uncover the mechanisms of NDS formula for the treatment of AD. Firstly, we collected the constituents in NDS formula and key targets toward AD. Then, drug-likeness, oral bioavailability, and blood-brain barrier permeability were evaluated to find drug-like and lead-like constituents for treatment of central nervous system diseases. By combining the advantages of machine learning, molecular docking, and pharmacophore mapping, we attempted to predict the targets of constituents and find potential multi-target compounds from NDS formula. Finally, we built constituent-target network, constituent-target-target network and target-biological pathway network to study the network pharmacology of the constituents in NDS formula. To the best of our knowledge, this represented the first to study the mechanism of NDS formula for potential efficacy for AD treatment by means of the virtual screening and network pharmacology methods.

A retrieval method of drug molecules based on graph collapsing / 北京大学学报(医学版)

OBJECTIVE@#To establish a compact and efficient hypergraph representation and a graph-similarity-based retrieval method of molecules to achieve effective and efficient medicine information retrieval.@*METHODS@#Chemical structural formula (CSF) was a primary search target as a unique and precise identifier for each compound at the molecular level in the research field of medicine information retrieval. To retrieve medicine information effectively and efficiently, a complete workflow of the graph-based CSF retrieval system was introduced. This system accepted the photos taken from smartphones and the sketches drawn on tablet personal computers as CSF inputs, and formalized the CSFs with the corresponding graphs. Then this paper proposed a compact and efficient hypergraph representation for molecules on the basis of analyzing factors that directly affected the efficiency of graph matching. According to the characteristics of CSFs, a hierarchical collapsing method combining graph isomorphism and frequent subgraph mining was adopted. There was yet a fundamental challenge, subgraph overlapping during the collapsing procedure, which hindered the method from establishing the correct compact hypergraph of an original CSF graph. Therefore, a graph-isomorphism-based algorithm was proposed to select dominant acyclic subgraphs on the basis of overlapping analysis. Finally, the spatial similarity among graphical CSFs was evaluated by multi-dimensional measures of similarity.@*RESULTS@#To evaluate the performance of the proposed method, the proposed system was firstly compared with Wikipedia Chemical Structure Explorer (WCSE), the state-of-the-art system that allowed CSF similarity searching within Wikipedia molecules dataset, on retrieval accuracy. The system achieved higher values on mean average precision, discounted cumulative gain, rank-biased precision, and expected reciprocal rank than WCSE from the top-2 to the top-10 retrieved results. Specifically, the system achieved 10%, 1.41, 6.42%, and 1.32% higher than WCSE on these metrics for top-10 retrieval results, respectively. Moreover, several retrieval cases were presented to intuitively compare with WCSE. The results of the above comparative study demonstrated that the proposed method outperformed the existing method with regard to accuracy and effectiveness.@*CONCLUSION@#This paper proposes a graph-similarity-based retrieval approach for medicine information. To obtain satisfactory retrieval results, an isomorphism-based algorithm is proposed for dominant subgraph selection based on the subgraph overlapping analysis, as well as an effective and efficient hypergraph representation of molecules. Experiment results demonstrate the effectiveness of the proposed approach.

Construction of chemical information database based on optical structure recognition technique / 北京大学学报(医学版)

OBJECTIVE@#To create a protocol that could be used to construct chemical information database from scientific literature quickly and automatically.@*METHODS@#Scientific literature, patents and technical reports from different chemical disciplines were collected and stored in PDF format as fundamental datasets. Chemical structures were transformed from published documents and images to machine-readable data by using the name conversion technology and optical structure recognition tool CLiDE. In the process of molecular structure information extraction, Markush structures were enumerated into well-defined monomer molecules by means of QueryTools in molecule editor ChemDraw. Document management software EndNote X8 was applied to acquire bibliographical references involving title, author, journal and year of publication. Text mining toolkit ChemDataExtractor was adopted to retrieve information that could be used to populate structured chemical database from figures, tables, and textual paragraphs. After this step, detailed manual revision and annotation were conducted in order to ensure the accuracy and completeness of the data. In addition to the literature data, computing simulation platform Pipeline Pilot 7.5 was utilized to calculate the physical and chemical properties and predict molecular attributes. Furthermore, open database ChEMBL was linked to fetch known bioactivities, such as indications and targets. After information extraction and data expansion, five separate metadata files were generated, including molecular structure data file, molecular information, bibliographical references, predictable attributes and known bioactivities. Canonical simplified molecular input line entry specification as primary key, metadata files were associated through common key nodes including molecular number and PDF number to construct an integrated chemical information database.@*RESULTS@#A reasonable construction protocol of chemical information database was created successfully. A total of 174 research articles and 25 reviews published in Marine Drugs from January 2015 to June 2016 collected as essential data source, and an elementary marine natural product database named PKU-MNPD was built in accordance with this protocol, which contained 3 262 molecules and 19 821 records.@*CONCLUSION@#This data aggregation protocol is of great help for the chemical information database construction in accuracy, comprehensiveness and efficiency based on original documents. The structured chemical information database can facilitate the access to medical intelligence and accelerate the transformation of scientific research achievements.

Network pharmacology-based analysis of Chinese herbal Naodesheng formula for application to Alzheimer's disease / 中国天然药物

Naodesheng (NDS) formula, which consists of Rhizoma Chuanxiong, Lobed Kudzuvine, Carthamus tinctorius, Radix Notoginseng, and Crataegus pinnatifida, is widely applied for the treatment of cardio/cerebrovascular ischemic diseases, ischemic stroke, and sequelae of cerebral hemorrhage, etc. At present, the studies on NDS formula for Alzheimer's disease (AD) only focus on single component of this prescription, and there is no report about the synergistic mechanism of the constituents in NDS formula for the potential treatment of dementia. Therefore, the present study aimed to predict the potential targets and uncover the mechanisms of NDS formula for the treatment of AD. Firstly, we collected the constituents in NDS formula and key targets toward AD. Then, drug-likeness, oral bioavailability, and blood-brain barrier permeability were evaluated to find drug-like and lead-like constituents for treatment of central nervous system diseases. By combining the advantages of machine learning, molecular docking, and pharmacophore mapping, we attempted to predict the targets of constituents and find potential multi-target compounds from NDS formula. Finally, we built constituent-target network, constituent-target-target network and target-biological pathway network to study the network pharmacology of the constituents in NDS formula. To the best of our knowledge, this represented the first to study the mechanism of NDS formula for potential efficacy for AD treatment by means of the virtual screening and network pharmacology methods.

El significado del capital social "individual" en diabéticos receptores de cuidado en un contexto urbano colombiano / The meaning of "individual" social capital for diabetics receiving care in a Colombian city / O significado do capital social "individual" em diabéticos que precisam de cuidados dentro de um contexto urbano colombiano

Comprender el significado del capital social de la diabetes tipo 2 según género, dentro un contexto urbano colombiano. Investigación cualitativa del interaccionismo simbólico. 25 mujeres y 16 hombres, diabéticos, familiares, vecinos y personal asistencial participaron en seis grupos focales. Emergieron 850 códigos que se integraron en un set de 142 códigos de códigos para el ego, el alter y alter ego. Tres categorías y veinte subcategorías fueron identificadas para el diseño del "paradigma de la codificación". El significado no es igual para hombres y mujeres. Los vínculos sociales de las redes sociales, creados cotidianamente por la confianza y la solidaridad para el cuidado, son valorados de manera diferente, debido a experiencias y hechos sociales resultantes de la autoconfianza, la autoeficacia para el apoyo social principalmente y, la autoestima frente al manejo y control de la enfermedad. Los recursos sociales de un individuo son reificados para el manejo y cuidado de la enfermedad como estrategia para disminuir las inequidades en salud.

The aim of this study was to understand the meaning of social capital in relation to type 2 diabetes according to gender, within an urban setting in Colombia, based on a qualitative design for symbolic interactionism. Twenty-four women and 16 men with diabetes, family members, and healthcare personnel participated in six focus groups. A total of 850 codes emerged that comprised a set of 142 codes for ego, alter, and alter ego. Three categories and 20 subcategories were identified for the "coding paradigm design". The meaning differed between men and women. Social ties in social networks, created daily through trust and solidarity for care, were valued differently due to the social experiences and events resulting from self-confidence, self-efficacy for social support, and mainly self-esteem vis-à-vis management and control of the disease. An individual's social resources are reified for the management and care of the disease as a strategy to mitigate health inequalities. .

Compreender o significado do capital social, diabetes tipo 2 por sexo, um contexto urbano da Colômbia. pesquisa qualitativa do interacionismo simbólico. 25 mulheres e 16 homens, diabéticos, familiares, vizinhos e cuidadores participaram seis grupos focais. 850 códigos se que foram integrados em um conjunto de 142 codes para o ego, o alter e alter ego. Três categorias e vinte subcategorias foram identificados para o projeto de "codificação de paradigma". O significado não é o mesmo para homens e mulheres. Laços sociais das redes sociais criadas diariamente pela confiança e solidariedade são valorizados cuidado diferente, porque as experiências sociais e fatos resultantes da auto-confiança, auto-eficácia e de apoio social, principalmente, auto-gestão e controle em relação a doença. Os recursos sociais de um indivíduo são reificadas para a gestão o cuidado da doença como uma estratégia para reduzir as desigualdades na saúde.

A Novel, Potent, Small Molecule AKT Inhibitor Exhibits Efficacy against Lung Cancer Cells In Vitro / Journal of the Korean Cancer Association, 대한암학회지

PURPOSE: Anomalies of Akt regulation, including overexpression in lung cancer, impart resistance to conventional chemotherapy and radiation, thereby implicating this kinase as a therapeutic intervention point. A novel scaffold of Akt inhibitors was developed through virtual screening of chemical databases available at Birla Institute of Technology and Science, Pilani, Hyderabad, based on docking studies using Maestro. A benzothienopyrimidine derivative (BIA-6) was identified as a potential lead molecule that inhibited Akt1 enzyme activity with an IC50 of 256 nM. MATERIALS AND METHODS: BIA-6 was tested for in vitro Akt1 inhibition using a fluorescence resonance energy transfer kit. Anti-proliferative activity was tested in NCI-H460, A549, NCI-H1975, and NCI-H2170 cell lines. The effect of the compound on p-Akt (S473) was estimated. RESULTS: BIA-6 allosterically caused a dose dependent reduction of growth of cell lines with a half maximal growth inhibition (GI50) range of 0.49 muM to 6.6 muM. Cell cycle analysis indicated that BIA-6 caused a G1 phase arrest at < 100 nM but led to apoptosis at higher doses. BIA-6 also exhibited synergism with standard chemotherapeutic agents. CONCLUSION: BIA-6 is a novel, allosteric Akt inhibitor with potent anti-cancer activity in lung cancer cell lines, that effectively blocks the phosphoinositide-3 kinase/Akt pathway with a high margin selectivity towards normal cells.

Bases moleculares da depleção de glutationa sobre a pontencialidade, diferenciação e envelhecimento de células-tronco de pele / Molecular basis of glutathione depletion upon the potenciality, differentiation potential and aging of skin stem cells

A pele está em contínua auto-renovação graças a vários nichos de células-tronco presentes neste tecido. Células progenitoras epidérmicas surgem durante o desenvolvimento embrionário e contribuem para a reposição celular da epiderme durante todo o período de vida dos mamíferos. Neste trabalho, buscou-se analisar o papel da depleção de glutationa durante a estratificação da epiderme embrionária e na manutenção da homeostase no tecido adulto. Encontramos evidências de que este tiol tem um importante papel durante a proliferação da epiderme e formação do folículo capilar. As alterações observadas na ausência de GSH foram relacionados com um padrão diferencial de fosforilação dos fatores de transcrição forkhead-homeobox- tipo-O (FOXO). Em resumo, foi estabelecida uma correlação entre o estado de GSH, a fosforilação de FOXO e o desenvolvimento da epiderme. Para melhor estudar a importância do balanço de GSH, na pele do adulto, e seu papel na manutenção deste tecido, camundongos foram tratados com um inibidor da síntese de GSH e, com N-aceti-lcisteína. Foi observado um aumento da fosforilação de Akt, padrões alterados de fosforilação FOXO e aumento da expressão de genes de genes relacionados à diferenciação. Estes resultados mostram que a via Akt/FOXO desempenha um papel importante na manutenção e diferenciação de células-tronco epidermais. O envelhecimento cronológico leva a alterações morfológicas/funcionais que conduzem à diminuição da auto-renovação, o que ocorre concomitantemente com uma diminuição dos níveis de GSH na pele. Utilizamos, também, animais idosos e avaliamos quais mecanismos eram compartilhados pelo envelhecimento e a depleção deste tiol. Observou-se que uma resposta hiperproliferativa ligada à exaustão de células-tronco pode ser o elo entre a depleção de GSH e o envelhecimento. A influência desse processo também foi investigada no compartimento dérmico, através da análise do impacto da depleção de glutationa sobre a osteogênese de células-tronco mesenquimais murinas. Quando induzidas a se diferenciarem em osso (Alizarin-Red+/Von-Kossa-stain +, aumento dos níveis de mRNA para fosfatase alcalina/osteopontina/osterix), o balanço GSH/GSSG e seu sistema antioxidante correlato é diferencialmente regulado em células-tronco mesenquimais derivadas da derme. Sendo regulado de uma forma redox-dependente através da via de MAPKs. A depleção de GSH leva à diminuição nos níveis de osteogênese em favor da adipogênese, levando ao processo comumente associado ao envelhecimento denominado "adipogenic switc". Em conclusão, os dados obtidos permitem propor um papel central para a glutationa na manutenção/comprometimento de células-tronco na pele

The skin is continuously self-renewing thanks to several stem cell niches. Epidermal progenitor cells arise during embryonic development and contribute to the replenishment of the epidermis during the lifetime of mammals. We set out to analyze the glutathione (GSH) antioxidant system during embryonic epidermis stratification and follicle development and the effect of glutathione withdrawal in this process. We found that glutathione plays an important role during epidermis proliferation and hairshaft formation. The changes observed in the absence of GSH were related to a differential phosphorylation pattern of the forkhead-homeobox-type-O (FOXO) transcription factors. In brief, a correlation between GSH status, FOXO phosphorylation and skin development was established. To further study the importance of GSH in adult skin maintenance and understand the effects of ROS in the Akt/FOXO pathway, we treated cells and mice with an inhibitor of GSH synthesis, and with N-acetyl-cysteine. Increased Akt phosphorylation, altered FOXO phosphorylation patterns and increased gene expression of differentiation-related genes were observed. Our results show that the Akt/FOXO pathway plays an important role in maintenance/differentiation of epidermal stem cells. Chronological ageing leads to morphological/functional changes causing a decline in self-renewal, as well as decreased levels of GSH. We also observed that a cell cycle hyperproliferative response was the link between stem cell exaustion in GSH-depletion and ageing. Dermal mesenchymal stem cells (MSCs), are capable of adipo-chondro- and osteogenesis. Little is known about the impact of ROS in MSC differentiation. We induced murine skin MSCs to differentiate into bone (Alizarin-Red/Von-Kossastain+, increased levels of mRNA for alkalinephosphatase/ osteopontin/osterix). In brief, the balance of GSH/GSSG and related antioxidant system is differentially regulated during this process, found to be regulated in a redox-dependent fashion through the MAPK pathway. When depleted, GSH leads to an adipogenic switch in MSC differentiation. In conclusion, our data leads us to propose a central role for glutathione in the maintenance/commitment of stem cells in skin

Analysis and thinking on status of constituent library of traditional Chinese Medicines in China / 中国中药杂志

Natural products from traditional Chinese medicines (TCMs) are one of the important sources for drug discovery. Systematic investigation on chemical constituents of TCMs plays one key role in TCMs R & D. Research and development on the constituent library of TCMs including the constituent repository and database (eCL-TCMs) is significant for the modernization of TCMs and new drug R & D. This paper reviews the status of current compound libraries and databases in China, analyzes some key problems, and proposes the necessity and ideas of the running eCL-TCMs supported by the National New Drug Innovation Great Project of China (2011ZX09307-002-02). The eCL-TCMs are large-scale, high-quality, comprehensive, standard, open-access, and are integrated with quality control system, drug screening and discovery platforms.

WebChemDB: An Integrated Chemical Database Retrieval System

WebChemDB is an integrated chemical database retrieval system that provides access to over 8 million publicly available chemical structures, including related information on their biological activities and direct links to other public chemical resources, such as PubChem, ChEBI, and DrugBank. The data are publicly available over the web, using two-dimensional (2D) and three-dimensional (3D) structure retrieval systems with various filters and molecular descriptors. The web services API also provides researchers with functionalities to programmatically manipulate, search, and analyze the data.