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1.
Genome ; 60(2): 128-138, 2017 Feb.
Article in English | MEDLINE | ID: mdl-28084809

ABSTRACT

In the present study, we sequenced the complete mitochondrial genome (mitogenome) of Agrius convolvuli (Lepidoptera: Sphingidae) and compared it with previously sequenced mitogenomes of lepidopteran species. The mitogenome was a circular molecule, 15 349 base pairs (bp) long, containing 37 genes. The order and orientation of genes in the A. convolvuli mitogenome were similar to those in sequenced mitogenomes of other lepidopterans. All 13 protein-coding genes (PCGs) were initiated by ATN codons, except for the cytochrome c oxidase subunit 1 (cox1) gene, which seemed to be initiated by the codon CGA, as observed in other lepidopterans. Three of the 13 PCGs had the incomplete termination codon T, while the remainder terminated with TAA. Additionally, the codon distributions of the 13 PCGs revealed that Asn, Ile, Leu2, Lys, Phe, and Tyr were the most frequently used codon families. All transfer RNAs were folded into the expected cloverleaf structure except for tRNASer(AGN), which lacked a stable dihydrouridine arm. The length of the adenine (A) + thymine (T)-rich region was 331 bp. This region included the motif ATAGA followed by a 19-bp poly-T stretch and a microsatellite-like (TA)8 element next to the motif ATTTA. Phylogenetic analyses (maximum likelihood and Bayesian methods) showed that A. convolvuli belongs to the family Sphingidae.


Subject(s)
Genome, Mitochondrial , Ipomoea batatas/parasitology , Lepidoptera/genetics , Animals , Base Composition , Computational Biology/methods , DNA, Intergenic , Gene Order , High-Throughput Nucleotide Sequencing , Lepidoptera/classification , Molecular Sequence Annotation , Open Reading Frames , Phylogeny
2.
Article in English | MEDLINE | ID: mdl-28008655

ABSTRACT

In present study, a Cecropin-like peptide from Antheraea pernyi (ApCec) was cloned and characterized. The full-length ApCec cDNA encoded a protein with 64 amino acids including a putative 22-amino-acid signal peptide, a 4-amino-acid propeptide, and a 38-amino-acid mature peptide. ApCec gene was highly expressed in Malpighian tubules of A. pernyi after induction for 24 h by Escherichia coli in PBS. Pro-ApCec (including propeptide and mature peptide) and M-ApCec (just mature peptide) were synthesized chemically and analyzed by HPLC and mass spectroscopy. The antibacterial activity of M-ApCec is more potent than pro-ApCec against E. coli K12 or B. subtilus in both minimum inhibitory concentration and inhibition zone assays. Hemolytic assay results showed M-ApCec possessed a low cytotoxicity to mammalian cells. The secondary structure of M-ApCec forms α-helical structure, shown by circular dichroism spectroscopy. Transmission electron microscopy analysis suggested that M-ApCec killed bacteria by disrupting bacterial cell membrane integrity. Our results indicate ApCec may play an important role in defending from pathogenic bacteria in A. pernyi, and it may be as a potential candidate for applications in antibacterial drug development and agriculture.


Subject(s)
Anti-Bacterial Agents/pharmacology , Cecropins/genetics , Cecropins/pharmacology , Insect Proteins/genetics , Moths/genetics , Amino Acid Sequence , Animals , Bacillus subtilis/drug effects , Cecropins/chemistry , Cecropins/metabolism , Cloning, Molecular , DNA, Complementary/genetics , DNA, Complementary/metabolism , Escherichia coli/physiology , Escherichia coli K12/drug effects , Gene Expression Regulation , Insect Proteins/chemistry , Insect Proteins/metabolism , Larva/genetics , Larva/growth & development , Larva/metabolism , Moths/growth & development , Moths/metabolism , Phylogeny , RNA, Messenger/genetics , RNA, Messenger/metabolism , Real-Time Polymerase Chain Reaction , Sequence Alignment
3.
J Invertebr Pathol ; 150: 6-14, 2017 11.
Article in English | MEDLINE | ID: mdl-28859880

ABSTRACT

Cathepsins are key members of mammalian papain-like cysteine proteases that play an important role in the immune response. In this study, a fragment of cDNA encoding cathepsin O proteinase (ApCathepsin O) was cloned from Antheraea pernyi. It contains an open reading frame of 1170bp and encodes a protein with 390 amino acid residues, including a conserved I29 inhibitor domain and a peptidase C1A (clan CA of cysteine proteases, papain family C1 subfamily) domain. Comparison with other previously reported cathepsin O proteins showed identity ranging from 45% to 79%. Quantitative real-time PCR (qRT-PCR) and Western blot analysis revealed that ApCathepsin O was highly expressed in the fat body; furthermore, the high expression during the pupal stage indicated that it might be involved during metamorphosis. After exposure to four different heat-killed pathogens (Escherichia coli, Beauveria bassiana, Micrococcus luteus, and A. pernyi nucleopolyhedrovirus), the expression levels of ApCathepsin O mRNA significantly increased and showed variable expression patterns. This indicates that ApCathepsin O is potentially involved in the innate immune system of A. pernyi. Interestingly, ApCathepsin O expression was upregulated after 20-hydroxyecdysone (20E) injection, which suggested that it might be regulated by 20E. In conclusion, ApCathepsin O is a protease that may play an important role in the innate immune response and metamorphosis of A. pernyi.


Subject(s)
Cathepsins/metabolism , Immunity, Innate/physiology , Insect Proteins/metabolism , Metamorphosis, Biological/physiology , Moths/metabolism , Animals , Cathepsins/genetics , Cloning, Molecular , Insect Proteins/genetics , Moths/genetics
4.
Fish Shellfish Immunol ; 56: 162-168, 2016 Sep.
Article in English | MEDLINE | ID: mdl-27417230

ABSTRACT

Cathepsin B is a lysosomal cysteine protease of the papain-like enzyme family with multiple biological functions. In the present study, a cathepsin B gene (named PcCTSB) was cloned and characterized from the red crayfish, Procambarus clarkii. The cDNA fragments of PcCTSB was 990 bp in length. It encoded a putative protein of 329 amino acid residues with predicted molecular weight of 36.4 kDa and isoelectric point of 7.020. Sequence alignment revealed that PcCTSB protein is 53.6%-80.4% identical with those from other 10 species. The predicted tertiary structure of PcCTSB protein was highly similar to that of animals. The results of the phylogenetic analysis indicated that the PcCTSB protein could be clustered with the Eriocheir sinensis cathepsin B protein. The recombinant protein of PcCTSB was expressed successfully in Escherichia coli cells. The mRNA expressions of PcCTSB were detected in all tested tissues, particularly high in the hepatopancreas. After lipopolysaccharide (LPS) challenge, the expression levels of PcCTSB were up-regulated significantly at different time points compared with control. Our results suggested that the PcCTSB might play an important role in defending against the pathogenes infection.


Subject(s)
Arthropod Proteins/genetics , Astacoidea/genetics , Astacoidea/immunology , Cathepsin B/genetics , Gene Expression Regulation/immunology , Amino Acid Sequence , Animals , Arthropod Proteins/chemistry , Arthropod Proteins/metabolism , Astacoidea/classification , Astacoidea/metabolism , Base Sequence , Cathepsin B/chemistry , Cathepsin B/metabolism , Cloning, Molecular , DNA, Complementary/genetics , DNA, Complementary/metabolism , Gene Expression Regulation/drug effects , Lipopolysaccharides/pharmacology , Phylogeny , RNA, Messenger/genetics , RNA, Messenger/metabolism , Recombinant Proteins/chemistry , Recombinant Proteins/genetics , Recombinant Proteins/metabolism , Sequence Alignment
5.
BMC Cardiovasc Disord ; 16: 119, 2016 05 31.
Article in English | MEDLINE | ID: mdl-27246834

ABSTRACT

BACKGROUND: This study evaluated the protective effect of Echinatin against myocardial ischemia/reperfusion (I/R) injury in rats. METHODS: The effect of Echinatin on cardiac function in rats subjected to I/R was demonstrated through improved Langendorff retrograde perfusion technology. Adult Sprague-Dawley rats were randomly divided into five groups, and myocardial infarct size was macroscopically estimated through 2,3,5-triphenyltetrazolium chloride staining. The coronary effluent was analyzed for the release of lactate dehydrogenase (LDH) and creatine kinase (CK) to assess the degree of cardiac injury. The concentrations of malondialdehyde (MDA), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) were determined along with superoxide dismutase (SOD) activity using ELISA. Finally, cardiomyocyte apoptosis analysis was conducted with POD, an in situ cell death detection kit. RESULTS: Echinatin (0.5 and 2.5 µg/mL) pretreatment enhanced the maximum up/down rate of the left ventricular pressure (±dp/dtmax), improved the heart rate, increased the left ventricular developed pressure (LVDP), enhanced the coronary flow, and reduced the CK and LDH levels in the coronary flow of the treated group compared with the I/R group. Echinatin limited the contents of CK and LDH, improved the LVDP, reduced the contents of MDA, IL-6, and TNF-α, and increased the SOD activity. The infarct size and cell apoptosis in the hearts of the rats in the Echinatin-treated group were smaller and lower, respectively, than those in the hearts of the rats in the I/R control group. CONCLUSION: Echinatin exerts a protective effect against I/R-induced myocardial injury on hearts. This effect may be attributed to the antioxidant and anti-inflammatory activities of this compound.


Subject(s)
Cardiotonic Agents/pharmacology , Chalcones/pharmacology , Myocardial Reperfusion Injury/prevention & control , Ventricular Function, Left/drug effects , Animals , Anti-Inflammatory Agents/pharmacology , Antioxidants/pharmacology , Apoptosis/drug effects , Coronary Circulation/drug effects , Creatine Kinase/metabolism , Cytoprotection , Dose-Response Relationship, Drug , Heart Rate/drug effects , Inflammation Mediators/metabolism , Interleukin-6/metabolism , Isolated Heart Preparation , L-Lactate Dehydrogenase/metabolism , Malondialdehyde/metabolism , Myocardial Reperfusion Injury/metabolism , Myocardial Reperfusion Injury/pathology , Myocardial Reperfusion Injury/physiopathology , Myocardium/metabolism , Myocardium/pathology , Oxidative Stress/drug effects , Rats, Sprague-Dawley , Superoxide Dismutase/metabolism , Time Factors , Tumor Necrosis Factor-alpha/metabolism , Ventricular Pressure/drug effects
6.
J Invertebr Pathol ; 138: 10-7, 2016 07.
Article in English | MEDLINE | ID: mdl-27261060

ABSTRACT

Yippee was first identified as a protein that physically interacts with the Hemolin protein of Hyalophora cecropia. In this study, we identified a gene with a 366bp open reading frame (ORF) that encodes a 121 amino acid protein containing a conserved Yippee domain. We named this gene Ap-Yippee (Yippee gene from Antheraea pernyi), and investigated the role of the protein in the host immune response. A recombinant Ap-Yippee protein was expressed in Escherichia coli cells, and polyclonal antibodies were produced against the recombinant protein. Real-time PCR and a Western blot analysis revealed that Ap-Yippee is expressed in the hemocytes, Malpighian tubules, midgut, silk gland, epidermis, and fat bodies of A. pernyi, with the highest expression level observed in Malpighian tubules. The fifth instar larvae of A. pernyi were challenged by injecting them with nucleopolyhedrovirus (AP-NPV), the Gram-negative bacterium E. coli, the Gram-positive bacterium Micrococcus luteus, or the entomopathogenic fungus, Beauveria bassiana. These challenges with diverse pathogens resulted in differential expression patterns of the protein. A knockdown of the Ap-Yippee gene by small interfering RNA (siRNA) transfection had a significant influence on the expression of the hemolin in the pupae which was confirmed by qRT-PCR and Western blot. Furthermore, a possible protein-protein interaction between Ap-Yippee and Hemolin was explored by Far-Western blotting. Therefore, our data suggest that the Ap-Yippee protein is involved in a pathway that regulates the immune response of insects.


Subject(s)
Immunity, Innate/immunology , Insect Proteins/immunology , Moths/genetics , Moths/immunology , Amino Acid Sequence , Animals , Base Sequence , Blotting, Western , Carrier Proteins/biosynthesis , Carrier Proteins/immunology , Immunoglobulins/immunology , Immunoglobulins/metabolism , Insect Proteins/genetics , Insect Proteins/metabolism , Real-Time Polymerase Chain Reaction , Sequence Alignment , Transcriptome
7.
Arch Insect Biochem Physiol ; 89(4): 181-92, 2015 Aug.
Article in English | MEDLINE | ID: mdl-25808998

ABSTRACT

The vitellogenin receptor (VgR) plays a key role on embryonic development in oviparous animals. Here, we cloned a VgR gene, which was identified from the wild silkworm Bombyx mandarina (BmaVgR) using reverse transcriptase polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). Sequence analysis revealed that BmaVgR is 5,861 bp long with an open reading frame encoded by 1,811 amino acid residues. The predicted amino acid sequence has 99.7 and 98.2% identity with the VgRs of Actias selene and Bombyx mori, respectively. The class B domain sequence of BmaVgR was cloned and expressed in Escherichia coli, and purified by a Ni-NTA column. Polyclonal antibodies were produced against the purified recombinant protein, and titer of the antibody was about 1:12,800 measured by enzyme-linked immunosorbent assay (ELISA). Western blot and RT-qPCR showed that BmaVgR was expressed in the ovary and fat body of female larvae and the ovary of moth, and the expression level was highest at the third day and then declined from third day to seventh in fat body of pupa. After knockdown of the BmaVgR gene through RNA interference (RNAi), other three BmaVgR-related genes (Vg, egg-specific protein, and low molecular weight lipoprotein LP gene) were all downregulated significantly.


Subject(s)
Bombyx/metabolism , Egg Proteins/metabolism , Insect Proteins/metabolism , Receptors, Cell Surface/metabolism , Animals , Bombyx/growth & development , Egg Proteins/genetics , Fat Body/metabolism , Female , Gene Expression Regulation, Developmental , Insect Proteins/genetics , Larva/metabolism , Organ Specificity , Ovary/metabolism , Pupa/metabolism , RNA Interference , Receptors, Cell Surface/genetics
8.
Arch Insect Biochem Physiol ; 88(3): 155-67, 2015 Mar.
Article in English | MEDLINE | ID: mdl-25348706

ABSTRACT

Apolipophorin-III (ApoLp-III) acts in lipid transport, lipoprotein metabolism, and innate immunity in insects. In this study, an ApoLp-III gene of Antheraea pernyi pupae (Ap-ApoLp-III) was isolated and characterized. The full-length cDNA of Ap-ApoLp-III is 687 bp, including a 5'-untranslated region (UTR) of 40 bp, 3'-UTR of 86 bp and an open reading frame of 561 bp encoding a polypeptide of 186 amino acids that contains an Apolipophorin-III precursor domain (PF07464). The deduced Ap-apoLp-III protein sequence has 68, 59, and 23% identity with its orthologs of Manduca sexta, Bombyx mori, and Aedes aegypti, respectively. Phylogenetic analysis showed that the Ap-apoLp-III was close to that of Bombycoidea. qPCR analysis revealed that Ap-ApoLp-III expressed during the four developmental stages and in integument, fat body, and ovaries. After six types of microorganism infections, expression levels of the Ap-ApoLp-III gene were upregulated significantly at different time points compared with control. RNA interference (RNAi) of Ap-ApoLp-III showed that the expression of Ap-ApoLp-III was significantly downregulated using qPCR after injection of E. coli. We infer that the Ap-ApoLp-III gene acts in the innate immunity of A. pernyi.


Subject(s)
Apolipoproteins/genetics , Immunity, Innate , Moths/genetics , Amino Acid Sequence , Animals , Apolipoproteins/biosynthesis , Apolipoproteins/immunology , Base Sequence , DNA, Complementary , Female , Life Cycle Stages , Male , Molecular Sequence Data , Moths/immunology , Moths/microbiology , Open Reading Frames , Phylogeny , RNA Interference , Real-Time Polymerase Chain Reaction , Untranslated Regions
9.
Med Sci Monit ; 21: 3474-82, 2015 Nov 12.
Article in English | MEDLINE | ID: mdl-26558525

ABSTRACT

BACKGROUND: The aim of this study was to investigate associations of 3 common polymorphisms in the VEGF gene, -2578C>A, -634C>G, and 936C>T, with risk of tetralogy of Fallot (TOF) in Chinese Han children. MATERIAL AND METHODS: From January 2010 to June 2013, a total of 400 pediatric subjects were recruited, including 160 cases with TOF (TOF group) and 240 healthy controls (control group). The genotypes of 3 common VEGF polymorphisms, -2578C>A, -634C>G, and 936C>T, were analyzed by polymerase chain reaction restriction fragment length polymorphism. All data were analyzed with SPSS 18.0 software. RESULTS: No significant differences were observed in body mass index or sex between TOF patients and controls (both P>0.05), but significant differences in age and family history of TOF were observed between the 2 groups (both P<0.05). The AA genotype in -2578C>A of VEGF was correlated with a significantly increased risk of TOF, and TOF risk in A allele carrier was 1.54-fold higher than that of C allele carrier (OR=1.54, 95%CI=1.14-2.09, P=0.005); the statistical significance was still present after Bonferroni correction (Pc=0.045). GG genotype in -634C>G of VEGF gene was also associated with an increased risk of TOF, and TOF risk in patients with G allele was 1.62-fold higher compared to patients with C allele (OR=1.62, 95%CI=1.19-2.21, P=0.002); the statistical significance was still present after Bonferroni correction (Pc=0.018). Interestingly, T allele in VEGF 936C>T polymorphism is associated with a decreased TOF risk (OR=0.65, 95%CI=0.49-0.87, P=0.003, the statistical significance was still present after Bonferroni correction (Pc=0.027). The result of logistic regression analysis revealed that -2578C>A, -634C>G, and 936C>T genotypes are independently related to the prevalence of TOF (all P<0.05). CONCLUSIONS: Our results confirmed that VEGF genetic polymorphisms, -2578C>A and -634C>G, may be associated with an increased TOF risk, while 936C>T polymorphism may be associated with decreased TOF risk.


Subject(s)
Polymorphism, Single Nucleotide , Tetralogy of Fallot/blood , Tetralogy of Fallot/genetics , Vascular Endothelial Growth Factor A/genetics , Alleles , Biomarkers/blood , Child , Child, Preschool , China , Echocardiography, Doppler , Female , Gene Frequency , Genotype , Heterozygote , Humans , Infant , Linkage Disequilibrium , Male , Polymerase Chain Reaction , Polymorphism, Restriction Fragment Length , Risk Factors , Software , Tetralogy of Fallot/diagnostic imaging , Tetralogy of Fallot/surgery , Vascular Endothelial Growth Factor A/blood
10.
Genomics ; 101(1): 64-73, 2013 Jan.
Article in English | MEDLINE | ID: mdl-23070077

ABSTRACT

The complete mitochondrial genome (mitogenome) of Bombyx mori strain Dazao (Lepidoptera: Bombycidae) was determined to be 15,653bp, including 13 protein-coding genes (PCGs), two rRNA genes, 22 tRNA genes and a A+T-rich region. It has the typical gene organization and order of mitogenomes from lepidopteran insects. The AT skew of this mitogenome was slightly positive and the nucleotide composition was also biased toward A+T nucleotides (81.31%). All PCGs were initiated by ATN codons, except for cytochrome c oxidase subunit 1 (cox1) gene which was initiated by CGA. The cox1 and cox2 genes had incomplete stop codons consisting of just a T. All the tRNA genes displayed a typical clover-leaf structure of mitochondrial tRNA. The A+T-rich region of the mitogenome was 495bp in length and consisted of several features common to the lepidopteras. Phylogenetic analysis showed that the B. mori Dazao was close to Bombycidae.


Subject(s)
Bombyx/genetics , Genome, Insect , Genome, Mitochondrial , Animals , Base Composition , Base Sequence , Codon, Initiator/genetics , Codon, Terminator/genetics , Electron Transport Complex IV/genetics , Genes, Insect , Insect Proteins/genetics , Lepidoptera/genetics , Molecular Sequence Data , Nucleic Acid Conformation , Phylogeny , RNA, Ribosomal/genetics , RNA, Transfer/chemistry , RNA, Transfer/genetics , Sequence Alignment
11.
J Invertebr Pathol ; 114(3): 313-23, 2013 Nov.
Article in English | MEDLINE | ID: mdl-24076149

ABSTRACT

Insects possess an innate immune system that responds to invading microorganisms. In this study, a subtractive cDNA library was constructed to screen for immune response-related genes in the fat bodies of Antheraea pernyi (Lepidoptera: Saturniidae) pupa challenged with Escherichia coli. Four hundred putative EST clones were identified by suppression subtractive hybridization (SSH), including 50 immune response-related genes, three cytoskeleton genes, eight cell cycle and apoptosis genes, five respiration and energy metabolism genes, five transport genes, 40 metabolism genes, ten stress response genes, four transcription and translation regulation genes and 77 unknown genes. To verify the reliability of the SSH data, the transcription of a set of randomly selected immune response-related genes were confirmed by semi-quantitative reverse transcription-PCR (RT-PCR) and real-time quantitative reverse transcription-PCR (qRT-PCR). These identified immune response-related genes provide insight into understanding the innate immunity in A. pernyi.


Subject(s)
Bombyx/immunology , Genes, Insect , Immunity, Innate/genetics , Amino Acid Sequence , Animals , Bombyx/microbiology , Escherichia coli/immunology , Fat Body/metabolism , Gene Library , Molecular Sequence Data , Phylogeny , Real-Time Polymerase Chain Reaction , Sequence Alignment
12.
Sci Rep ; 10(1): 7221, 2020 Apr 24.
Article in English | MEDLINE | ID: mdl-32332832

ABSTRACT

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

13.
Sci Rep ; 10(1): 7222, 2020 Apr 24.
Article in English | MEDLINE | ID: mdl-32332824

ABSTRACT

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

14.
Eur J Cardiothorac Surg ; 56(6): 1090-1096, 2019 Dec 01.
Article in English | MEDLINE | ID: mdl-31329842

ABSTRACT

OBJECTIVES: To study the perioperative outcomes and long-term survival rates in patients undergoing thoracic endovascular aortic repair (TEVAR) for uncomplicated type B dissection. METHODS: A total of 751 patients with uncomplicated type B dissection who underwent TEVAR at our centre between May 2001 and December 2013 were retrospectively reviewed. The mean age of all patients (619 males and 132 females) was 52.8 ± 10.9 years. The follow-up period ranged from 1 to 170 months (median 70 months). RESULTS: Five patients died during the perioperative period (mortality rate 0.7%). Four patients (0.5%) developed retrograde type A dissection. Two patients (0.3%) developed paraplegia and 1 patient developed incomplete paralysis (0.1%). There were no postoperative cerebral infarctions. The 5- and 10-year survival rates were 96.5% [95% confidence interval (CI) 95.0-98.0%] and 83.0% (95% CI 77.9-88.4%), respectively. The 5- and 10-year reintervention rates were 4.6% (95% CI 3.0-6.2%) and 7.9% (95% CI 5.3-10.5%), respectively. CONCLUSIONS: Although the application of TEVAR for patients with uncomplicated dissection is still under debate, many patients who have undergone TEVAR have benefitted substantially from the treatment. Our data showed that TEVAR had low mortality and complication rates both in the short- and long-term follow-up periods. TEVAR may be considered as a first choice for patients with uncomplicated type B dissection.


Subject(s)
Aortic Aneurysm, Thoracic/surgery , Aortic Dissection/surgery , Blood Vessel Prosthesis Implantation/methods , Endovascular Procedures/methods , Adult , Aorta/surgery , Blood Vessel Prosthesis Implantation/adverse effects , Blood Vessel Prosthesis Implantation/mortality , Endovascular Procedures/adverse effects , Endovascular Procedures/mortality , Female , Humans , Male , Middle Aged , Postoperative Complications/etiology , Reoperation , Retrospective Studies , Treatment Outcome
15.
Dev Comp Immunol ; 78: 114-123, 2018 01.
Article in English | MEDLINE | ID: mdl-28958702

ABSTRACT

Cathepsins are a group of protease, located in lysosome and play a vital role in physiological process. Here, we reported cathepsin L-like protease (Ap-cathL), which contained an open reading frame of 1155 bp and encoding 385 amino acid residues protein. The I29 inhibitor domain and peptidase C1A (clan CA of cysteine proteases, papain family C1 subfamily) putative conserved domains were detected in Ap-cathL. Quantitative real-time PCR (qRT-PCR) analysis revealed that Ap-cathL highly expressed in the fat body and midgut. The high expression during the molting stage, pupal stage and following 20E (20-hydroxyecdysone) treatment indicated that it maybe involved in the process of molting and metamorphosis. In addition, depletion of Ap-cathL influenced the expression of apoptosis pathway related genes. The protease inhibitor and RNA interference experiments showed that Ap-cathL was involved in the fat body dissociation of A. pernyi. These results suggest that Ap-cathL may involve in the process of metamorphosis and fat body dissociation of A. pernyi.


Subject(s)
Cathepsin L/metabolism , Fat Body/physiology , Insect Proteins/metabolism , Metamorphosis, Biological/genetics , Molting/genetics , Moths/physiology , Peptide Hydrolases/metabolism , Animals , Apoptosis/genetics , Cathepsin L/genetics , Cells, Cultured , Cloning, Molecular , Ecdysterone/metabolism , Gene Expression Regulation, Developmental , Insect Proteins/genetics , Peptide Hydrolases/genetics , RNA, Small Interfering/genetics
16.
Dev Comp Immunol ; 81: 187-192, 2018 04.
Article in English | MEDLINE | ID: mdl-29225004

ABSTRACT

The SOCS (Suppressor of cytokine signaling) family members are a potential negative regulator of cytokine signaling pathway and play a key role to maintain immunological functions in animals. SOCS-6 is an important member of the SOCS family, however the functions of this gene have rarely been explored among eukaryotes. Herein, we cloned and expressed SOCS-6 gene from Bombyx mori (Dazao) (BmSOCS-6), and anti-rabbit antibodies were prepared using purified recombinant BmSOCS-6 protein. Under normal physiological conditions, the BmSOCS-6 expression was observed at varied levels in six tissues, with most greatly expressed in fat body and hemocytes. After immune challenge with viral, fungal and bacterial pathogens, the BmSOCS-6 showed distinctly varied expression patterns in tissue, time and microbe dependent manner. By contrast, recombinant BmSOCS-6 protein strongly enhanced the expression of epidermal growth factor receptor (EGFR) pathway related genes, while the depletion of BmSOCS-6 by double stranded RNA suppressed their production. Altogether we concluded that BmSOCS-6 may improve the efficiency of EGFR signaling pathway in B. mori (Dazao).


Subject(s)
Bombyx/immunology , ErbB Receptors/metabolism , Fat Body/physiology , Hemocytes/physiology , Infections/immunology , Insect Proteins/genetics , Suppressor of Cytokine Signaling Proteins/genetics , Animals , Cloning, Molecular , Cytokines/metabolism , Gene Expression Regulation , Humans , Immunity, Innate , Insect Proteins/metabolism , Phylogeny , RNA, Small Interfering/genetics , Recombinant Proteins/genetics , Signal Transduction , Suppressor of Cytokine Signaling Proteins/metabolism
17.
Int J Biol Macromol ; 113: 961-970, 2018 Jul 01.
Article in English | MEDLINE | ID: mdl-29462677

ABSTRACT

The complete mitochondrial genome (mitogenome) of Biston marginata (Lepidoptera: Geometridae) was determined and annotated. The circular genome is 15,470bp long and it contains the entire set of 37 genes usually present in lepidopteran mitogenomes. The nucleotide composition of the genome is highly A+T biased, accounting for 81.20%, with a slightly positive AT skewness (0.028), indicating the occurrence of more As than Ts, as found in other Geometridae species. Except for cox1 gene starts with non-canonical initial codon CGA, all protein-coding genes start with ATN codon. Three of the 13 PCGs (protein coding gene) had an incomplete termination codon, T or TA, while the others terminated with TAA. All tRNA genes are predicted to fold into typical clover-leaf secondary structure, except for the trnS1 (AGN), in which the dihydrouridine (DHU) arm could not form a stable stem-loop structure. The A+T-rich region of 343bp is comprised of non-repetitive sequences, but have several distinctive features, including the motif "ATAGA" followed by a 19bp poly-T stretch, a microsatellite-like (TA)7 element next to the ATTTA motif. The phylogenetic analyses support the view that the B. marginata is closely related to the Biston pantrinaria, and confirm that Biston marginata belongs to the family Geometridae.


Subject(s)
Genome, Mitochondrial/genetics , Lepidoptera/classification , Lepidoptera/genetics , Phylogeny , Animals , Codon/genetics , DNA, Intergenic/genetics , GC Rich Sequence , Open Reading Frames/genetics , RNA, Ribosomal/genetics , RNA, Transfer/genetics
18.
J Insect Physiol ; 103: 47-56, 2017 11.
Article in English | MEDLINE | ID: mdl-29032156

ABSTRACT

Suppressors of cytokine signaling (SOCS) are a potent negative regulator of diverse cytokine-related responses to maintain various physiological processes in animals. Here, we obtained the SOCS2-12 gene sequence of Bombyx mori (Dazao) (BmSOCS2-12) from the National Center for Biotechnology Information (NCBI) to study its expression profile in different tissues, as well as in the immune tissues following larval exposure to pathogens. Further, we investigated the role of BmSOCS2-12 in producing antimicrobial peptides (AMPs) and as a regulator of ecdysteroid signaling transduction. The quantitative real-time PCR analysis revealed unequal transcript levels of BmSOCS2-12 in the different tissues, however the gene's expression was highest in those of fat body and hemocyte. The challenge with pathogens significantly upregulated the transcript level of BmSOCS2-12 in both fat body and hemocyte when compared with the control. By contrast, recombinant BmSOCS2-12 protein injections strongly suppressed the expression of AMPs, while the knockdown of BmSOCS2-12 by double-stranded RNA enhanced their production. Administration of 20-hydroxyecdysone significantly downregulated the BmSOCS2-12 expression in fat body, and the depletion of BmSOCS2-12 enhanced the transcript levels of 20-hydroxyecdysone-responsive genes at 48 h. Altogether, BmSOCS2-12 may have multiple functional roles in the physiology of B. mori (Dazao), since it negatively regulates the expression of AMPs and ecdysteroid signaling transduction.


Subject(s)
Antimicrobial Cationic Peptides/metabolism , Bombyx/metabolism , Suppressor of Cytokine Signaling Proteins/metabolism , Amino Acid Sequence , Animals , Bombyx/genetics , Bombyx/immunology , Ecdysterone/metabolism , Gene Expression , Gene Expression Regulation , Phylogeny , Suppressor of Cytokine Signaling Proteins/chemistry
19.
Dev Comp Immunol ; 76: 45-55, 2017 11.
Article in English | MEDLINE | ID: mdl-28545959

ABSTRACT

Genes encoding proteins of serpins superfamily are widely distributed in invertebrates. In insects, serpins play important roles in regulating immune responses and other physiological processes. Here, we report the cloning and characterization of cDNA of Apserpin-14 from Chinese oak silkworm (Antheraea pernyi). The Apserpin-14 gene contains 1206 bp open reading frame, encoding a predicted 401 amino acid residue protein. We expressed the recombinant Apserpin-14 protein in Escherichia coli and then purified protein was used to prepare rabbit anti-Apserpin-14 polyclonal antibodies. Quantitative real-time PCR analysis revealed that mRNA level of Apserpin-14 was highest in the fat body, whereas, among developmental stages the 5th instar and pupal stage showed greatest expression. Furthermore, Escherichia coli, Beauveria bassiana, Micrococcus luteus and nuclear polyhedrosis virus challenge enhanced Apserpin-14 transcript in both the fat body and hemocyte. Recombinant Apserpin-14 added to hemolymph inhibited spontaneous melanization and suppressed prophenoloxidase activation stimulated by M. luteus, but did not affect phenoloxidase (PO) activity. Injection of recombinant Apserpin-14 protein into A. pernyi larvae significantly reduced the transcript levels of antimicrobial peptides in the fat body, while its depletion by double stranded RNA enhanced their expression. We concluded that Apserpin-14 likely involved in regulation of proPO activation and production of antimicrobial peptides, implying its important role in the innate immune system of A. pernyi.


Subject(s)
Bombyx/metabolism , Catechol Oxidase/metabolism , Enzyme Precursors/metabolism , Insect Proteins/metabolism , Peptides/metabolism , Serpins/metabolism , Amino Acid Sequence , Animals , DNA, Complementary/metabolism , Fat Body/metabolism , Hemocytes/metabolism , Hemolymph/metabolism , Moths/metabolism , Recombinant Proteins/metabolism , Sequence Homology
20.
Zootaxa ; 4254(5): 501-519, 2017 Apr 20.
Article in English | MEDLINE | ID: mdl-28609941

ABSTRACT

In this study, a complete mitochondrial genome (mitogenome) sequence of Abraxas suspecta (Lepidoptera: Geometridae) is isolated and characterized. The complete DNA is 15,547 bp length and contains 2 ribosomal RNA genes, 23 putative transfer RNA (tRNA) genes including an extra tRNAAsn (AUU), 13 protein-coding genes and an adenine (A) + thymine (T)-rich region. The nucleotide composition and gene organization are identical to those of other lepidopteran, except for the presence of an extra copy of trnN (AUU). Of the 38 genes, twenty-five genes (9 PCGs and 16 tRNAs) are encoded by heavy strand (H-strand), while thirteen are encoded by light strand (L-strand). Among the 13 PCGs, 12 PCGs employ ATN as initiation codon, while cytochrome c oxidase subunit 1 (cox1) utilizes CGA as initiation codon. Four of the 13 PCGs have the incomplete termination codon T, while the remainder terminated with the canonical stop codon. All tRNA genes are folded into the typical clover-leaf structure of mitochondrial tRNAs, except for the tRNASer (AGN) gene, in which the DHU arm fails to form a stable stem-loop structure. The A+T-rich region is 532 bp long, and contains some conserved regions, including 'ATAGA' motif followed by a 17bp poly-T stretch, a microsatellite-like element (AT)8(AAT)3 and also a poly-A element. A short Phylogenetic analysis based on 13 PCGs using maximum likelihood (ML) and Bayesian inference (BI) revealed that A. suspecta resides in the Geometridae family. We present the method and approach to use moths as model organisms for further genetic and evolutionary biology studies.


Subject(s)
Genome, Mitochondrial , Moths , Animals , Base Sequence , Bayes Theorem , Lepidoptera , Phylogeny , RNA, Transfer , Sequence Analysis, DNA
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