A forensic entomological study conducted in an oil palm plantation in Tanjung Sepat, Selangor, Malaysia on 3 August 2007 revealed that a housefly, Musca domestica Linnaeus oviposited its eggs on a freshly dead pig. This finding indicated that housefly might play an important role in forensic investigation in determining post-mortem interval (PMI), although it was not yet found in human corpses or any animal carrion. This preliminary paper presented a first record of Musca domestica eggs found on animal carcass in the country.
Houseflies ; Swine ; Malaysia ; L ; occurrence

OBJECTIVETo better comprehend the molecular structure and physiological function of the housefly larval peritrophic matrix (PM), a mass spectrometry approach was used to investigate the PM protein composition.

METHODSThe PM was dissected from the midgut of the third instar larvae, and protein extracted from the PM was evaluated using SDS-PAGE. A 1D-PAGE lane containing all protein bands was cut from top to bottom, the proteins in-gel trypsinised and analysed via shotgun liquid chromatography- tandem mass spectrometry (LC-MS/MS).

RESULTSIn total, 374 proteins, with molecular weights varying from 8.225 kD to 996.065 kD and isoelectric points ranging from 3.83 to 11.24 were successfully identified, most identified proteins were mainly related to immunity, digestion, nutrient metabolism and PM structure. Furthermore, many of these proteins were functionally associated with pattern binding, polysaccharide binding, structural constituent of peritrophic membrane and chitin binding, according to Gene Ontology annotation.

CONCLUSIONThe PM protein composition, which provides a basis for further functional investigations of the identified proteins, will be useful for understanding the housefly larval gut immune system and may help to identify potential targets and exploit new bioinsecticides.

Animals ; Chitin ; metabolism ; Gastrointestinal Tract ; metabolism ; Houseflies ; metabolism ; Insect Proteins ; metabolism ; Larva ; metabolism ; Proteomics

The transposon vector containing enhanced green fluorescent protein (EGFP) was injected into early housefly (Musca domestica L.) eggs by microinjection method to realize stable gene expression in vivo for verification, and to study housefly gene function. A borosilicate glass micro injection needle suitable for microinjection of housefly eggs was made, the softening treatment conditions of housefly egg shells were explored, and a microinjection technology platform suitable for housefly was constructed with a high-precision microsyringe Nanoject Ⅲ as the main body. The recombinant plasmid PiggyBac-[3×P3]-EGFP containing the eye-specific 3×P3 promoter and EGFP and the stable genetic expression helper plasmid pHA3pig helper were microinjected into the treated housefly eggs. After emergence, the eye luminescence was observed, and the expression and transcription level of EGFP were detected. The results showed that the normal hatching rate of housefly eggs was 55% when rinsed in bleaching water for 35 s. The hardness of the egg shell treated for 35 s was suitable for injection and the injection needle was not easy to break. About 3% of the emerged housefly eyes had green fluorescence. Through further molecular detection, EGFP specific fragments with a size of 750 bp were amplified from DNA and RNA of housefly. Through the technical platform, the stable expression of reporter genes in housefly can be conveniently and effectively realized, and a bioreactor with housefly as the main body can be established, which provides certain reference value for subsequent research on housefly gene function.
Animals ; Animals, Genetically Modified ; Gene Expression ; Genes, Reporter ; Green Fluorescent Proteins/genetics* ; Houseflies/genetics* ; Microinjections

Estimation of postmortem interval (PMI) in a putrefied corpse has been a long theme in the forensic medicine. Insects, especially necrophagous fly species are now utilized as indicators of PMI because the first visitors to a dead body are usually known to be blow fly species (Family Calliphoridae). House flies (Family Muscidae) are later visitors but they are very significant in forensic entomology because of their worldwide distribution. Entomologic evidences recovered from the scene are often immature individuals such as eggs, maggots and pupae. Because growth rates and ecological characteristics are different among fly species, accurate species identification is essential. As species identification in immature stages is very difficult or even impossible to an expert entomologist, many researchers are trying to identify fly species by molecular techniques. Authors analyzed 400bp of mitochondrial COI gene sequences of six Muscidae fly species (Fannia prisca, Muscina angustifrons, Muscina stabulans, Musca domestica, Hydrotaea dentipes and Ophyra leucostoma). In spite of limited number of flies analyzed in this study, all six fly species have different haplotype of COI gene and shows minimal intraspecific variation. This result shows that six fly species analyzed in this study can be discriminated each other by COI gene sequence analysis. But, more individuals from various geographic region should be analyzed to apply this result to a forensic entomology practice.
Cadaver ; Cytochromes* ; Diptera* ; Eggs ; Electron Transport Complex IV* ; Entomology ; Forensic Medicine ; Haplotypes ; Houseflies ; Insects ; Larva ; Muscidae ; Ovum ; Pupa ; Sequence Analysis

We purified a novel mannose binding lectin form Musca domestica pupae by affinity chromatography on Con A-Sepharose 4B and DEAE weak anion-exchange chromatography. By SDS-PAGE, MBL-1 yielded a single band with the molecular weight of 24 kDa. It was a glycoprotein detected by periodic acid-schiffs staining reaction, with 97.36% protein and 2.1% oligosaccharide. Meanwhile, the results of beta-elimination reaction, infrared spectroscopy, atomic force microscopy and protein sequencing instrument show that MBL-1 was an ellipsoidal-shaped monomer with 60-100 nm in diameter. N-glycoside bond linked oligosaccharide chain and the N-terminal blocked peptide chain. Further study suggested that MBL-1 promote the proliferation of macrophage in a concentration-dependent manner. The scanning electron microscope analysis shows that MBL-1 promoted the activation of macrophages. These results show that MBL-1 purified from Musca domestica pupae possesses immune regulation effect, serving a reference basis to develop natural immune-modulator.
Animals ; Glycoproteins ; analysis ; Houseflies ; chemistry ; Immunomodulation ; immunology ; physiology ; Macrophages ; immunology ; Mannose-Binding Lectin ; chemistry ; physiology ; Oligosaccharides ; analysis ; Pupa ; chemistry

OBJECTIVETo verify houseflies Musca spp. as the intermediate host of Thelazia callipaeda and reveal epidemiological situation of thelaziasis in Hubei province.

METHODSDogs eyes infected with T. callipaeda, 400 houseflies Musca and 259 fruitflies Amiota okadai in the city of Laohekou city (previously named as Guanghua county) of Hubei province had been investigated since September 2000. The newborn larvae of T. callipaeda from Laohekou suburbs were fed to houseflies Musca and A. okadai. Larvae used for the study were isolated from female T. callipaeda in laboratory and the susceptibility to houseflies Musca and A. okadai was observed.

RESULTSTwenty-one dogs from Laohekou, the original epidemic areas of thelaziasis were examined and 7 positive dogs in 21 (33.3%) and 11 T. callipaeda (9 females and 2 males) were identified. From 1975 to 2000, no thelaziasis cases were found through retrospective surveys. These 200 houseflies Musca and 135 A. okadai were dissected for examination but showed all negative with the infection. However, newborn larvae of T. callipaeda were used to experimentally infect 112 houseflies Musca and 84 A. okadai and all infected flies were examined on the 20th day after inoculation. As a consequence, houseflies Musca failed to be infected but 9 in 84 (10.7%) A. okadai were positive. 26 infective larvae of T. callipaeda were obtained and 21 of them were inoculated into right eye of one rabbit. The female worm began to produce newborn larvae in 37 days after infection and 3 adult T. callipaeda (two females and one male) were obtained.

CONCLUSIONSFruitflies A. okadai from Hubei province were susceptible to T. callipaeda, which was similar to the result of experimental studies in Anhui province. This survey further confirmed that A. okadai was the intermediate host of T. callipaeda but not houseflies Musca. Infective resources (adult dogs, for instance) had been under controlled thus human thelaziasis had been eradicated in this rural area.

Animals ; Conjunctivitis ; parasitology ; Disease Reservoirs ; Dog Diseases ; parasitology ; Dogs ; Drosophila ; parasitology ; Eye Infections, Parasitic ; epidemiology ; transmission ; veterinary ; Female ; Host-Parasite Interactions ; Houseflies ; parasitology ; Humans ; Insect Vectors ; parasitology ; Longitudinal Studies ; Male ; Spirurida Infections ; epidemiology ; transmission ; veterinary ; Thelazioidea ; isolation & purification ; physiology

To screen the candidate genes associated with Musca domestica antibacterial peptides using DNA microarray technique, the hybrid probes were designed from the conservative domains of the encoded area of the insect antibacterial peptide genes in GenBank with biology software Designer 2.0, and were synthesized by a chemical process, with the assistance of the automated Gen III Microarray Spotter, those oligo probes were printed on a special ready-made glass, and a cDNA microarray was constructed. The total RNA was extracted from the fat body of Musca domestic third-instar larve induced after 24 hours by Escherichia coli and Staphylococcus aureus, the strands of cDNA were labled with fluoresceine Cy3 using the method of reverse transcription PCR, after prehybridization, hybridization and washing procedure, the results of hybridization were scanned using computer system, and the data were analyzed using the software of MIDAS, fifteen valid hybridization signals were detected through two times of hybridization and scanning (the positive samples as a control were excluded). DNA microarray technique can be successfully applied screen the candidate genes associated with Musca domestica antibacterial peptides, and further provide significant evidence to discover its antibacterial peptide new genes.
Animals ; Antimicrobial Cationic Peptides ; genetics ; Base Sequence ; Gene Expression Profiling ; Genes, Insect ; Houseflies ; genetics ; growth & development ; Larva ; genetics ; growth & development ; Molecular Sequence Data ; Oligonucleotide Array Sequence Analysis ; methods ; Oligonucleotide Probes ; chemistry

OBJECTIVETo study the inducible antibacterial activity of the hemolymph from housefly larva and analyze the antibacterial molecules.

METHODSThe hemolymph was collected from the third instar housefly larvae 48 h after pricking treatment. Nine standard bacterial strains were used for determination of the antibaterial activity of the collected hemolymph and its combination with ampicillin. The anti-yeast activity of the hemolymph and its mixture with fluconazol was also assayed. The antibacterial molecules in the hemolymph was analyzed by SDS-PAGE.

RESULTSThe growth of E.coli, Staphylococcus aureus, Staphylococcus albus, subserotypes of Shigeila flexneri, Bacillus proteus, Bacillus subtilis, Bacillus typhi, Bacillus paratyphosus, and Micrococcus lysodeikticus could be inhibited by the hemolymph collected from housefly larva, and the effect differed significantly between the groups (Plt;0.001). The hemolymph produced the strongest antibacterial activity against Micrococcus lysodeikticus, and the combination of the hemolymph with ampicillin most conspicuously inhibited the growth of Staphylococcus albus. The hemolyph and fluconazol exhibited obvious synergistic effect against yeast. SDS-PAGE identified some specific antibacterial molecules in the hemolymph.

CONCLUSIONThe induced hemolymph from housefly larva possesses strong antibacterial and antifungal activities especially against Micrococcus lysodeikticus. The hemolymph in combination with ampicillin produces the strongest effect against Staphylococcus albus, and fluconazol can significantly enhance the anti-yeast activity of the hemolymph through a synergistic mechanism.

Ampicillin ; pharmacology ; Animals ; Anti-Bacterial Agents ; pharmacology ; Antifungal Agents ; pharmacology ; Bacteria ; drug effects ; Electrophoresis, Polyacrylamide Gel ; Fluconazole ; pharmacology ; Hemolymph ; immunology ; Houseflies ; immunology ; Larva ; immunology ; Microbial Sensitivity Tests ; Yeasts ; drug effects