Project description:Clonorchiasis is associated with bile duct malignancy and the subsequent development of cholangiocarcinoma. Although this is likely caused by adult Clonorchis sinensis and its excretory-secretory products (ESP), the precise molecular mechanisms remain obscure. To evaluate the effect of C. sinensis infection on differential gene expression in host hepatocytes, we used cDNA microarrays in human cholangiocarcinoma cells through the mimicking of C. sinensis infestation, and analyzed differential mRNA expression patterns of host cells. Keywords: Time course
Project description:Analysis of host response to the infected Clonorchis sinensis metacercariae and adult worm. The infected tissues evidenced altered expression of genes involved in systems such as immune response and cell cycle regulation, as compared with normal tissues.
Project description:Analysis of host response to the infected Clonorchis sinensis metacercariae and adult worm. The infected tissues evidenced altered expression of genes involved in systems such as immune response and cell cycle regulation, as compared with normal tissues. Total RNA obtained from isolated liver tissues subjected to 1, 2, 4, and 6 weeks post-infection compared to uninfected liver tissues.
Project description:Clonorchiasis remains an important zoonotic parasitic disease worldwide. The molecular mechanisms of host-parasite interaction are not fully understood. Non-coding microRNAs (miRNAs) are considered to be key regulators in parasitic diseases. The regulation of miRNAs and host micro-environment may be involved in clonorchiasis, and require further investigation. MiRNA microarray technology and bioinformatic analysis were used to investigate the regulatory mechanisms of host miRNA and to compare miRNA expression profiles in the liver tissues of Clonorchis sinensis-infected rats and controls.A total of eight miRNAs were downregulated and two were upregulated, which showed differentially altered expression profiles in the liver tissue of C. sinensis-infected rats. Further analysis of the differentially expressed miRNAs revealed that many important signal pathways were triggered after infection with C. sinensis, which were related to clonorchiasis pathogenesis, such as cell apoptosis and inflammation, as well as genes involved in signal transduction mechanisms, such as pathways in cancer and the Wnt and Mitogen-activated protein kinases (MAPK) signaling pathways.This dysregulation in miRNA expression may contribute to the etiology and pathophysiology of clonorchiasis. These results also provide new insights into the regulatory mechanisms of miRNAs in clonorchiasis, which may present potential targets for future C. sinensis control strategies.
Project description:Clonorchiasis is a foodborne zoonotic disease caused by Clonorchis sinensis which belongs to trematodes with a complex lifecycle, there are increasing evidences that small RNAs including microRNAs and PIWI-interacting RNAs can participate in regulation of embryonic development. However, there is little information about the small RNAs in the different developmental stages of C. sinensis. In the present study, we investigated profiles of miRNAs and piRNAs in the different developmental stages including eggs, metacercaria and adults of C. sinensis using high-throughout sequencing technology. We found that 152 miRNAs for adults, 147 miRNAs for metacercariae and 161 miRNAs for eggs were identified, of these miRNAs, 52 miRNAs were universally expressed in these three developmental stage. For piRNAs, we also found that there were a total of 4573 piRNAs in adult worms, 3189 piRNAs in eggs and 3853 piRNAs in metacercariae, respectively, and 1127, 426, 756 piRNAs were absolutely expressed only in adults, eggs and metacercariae, respectively. These stage-specific small RNAs might be involved in various biological process and environmental adaption for parasitism as showed by GO and KEGG pathway analysis. The data of present study may provide a basis for future targeting at these stage-specific small RNAs for prevention and control clonorchisias.
Project description:Clonorchis sinensis is a zoonotic parasite causing clonorchiasis associated with human diseases such as biliary calculi, cholecystitis, liver cirrhosis, and is classified as carcinogenic to humans for cholangiocarcinoma. MicroRNAs (miRNAs) are non-coding, regulating small RNA molecules essential for the complex life cycle of parasites and involved in parasitic infections. To identify and characterize miRNAs expressed in adult C. sinensis residing chronically in the biliary tract, we developed an integrative approach combining deep sequencing, bioinformatic predictions with stem-loop real-time PCR analysis. Here we report the use of this approach to identify and clone 6 new and 62,512 conserved C. sinensis miRNAs which belong to 284 families. There is strong bias on families, family members and sequence nucleotides in C. sinensis. Uracil is the dominant nucleotide, particularly at positions 1, 14 and 22, which were located approximately at the beginning, middle and the end of conserved miRNAs. There is no significant “seed region” at the first and ninth positions commonly found in human, animals and plants. Categorization of conserved miRNAs indicated that miRNAs of C. sinensis are still innovated and concentrated along three branches of the phylogenetic tree leading to bilaterians, insects and coelomates. There are two miRNA strategies in C. sinensis for its parasitic life: keeping a large category of miRNA families of different animals and keeping a stringent conserved seed region with high active innovation in other place of miRNA mainly in the middle and the end, which are perfect for the parasite to perform its complex life style and for host changes. The present study represents the first large scale characterization of C. sinensis miRNAs, which have implications for understanding the complex biology of this zoonotic parasite, as well as the miRNA studies of other related species such as Opisthorchis felineus and O. viverrini of human and animal health significance.