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Assessment of the perturbation induced by chitin synthesis inhibitors lufenuron, flufenoxuron and hexaflumuron in the house fly, Musca domestica vicina (Diptera: Muscidae)
The Journal of Basic and Applied Zoology volume 83, Article number: 29 (2022)
The larvicidal and biochemical effects of chitin synthesis inhibitors (CSIs), namely lufenuron, flufenoxuron and hexaflumuron against the newly molted penultimate instar larvae of the house fly Musca domestica, were investigated.
Different concentrations from each tested compound were applied on forty individuals of M. domestica 2nd instar larvae. Four replicates were used for each concentration.
The recorded LC25 and LC75 values were (166.11, 68.33 and 56.43 ppm) and (732.33, 283.02 and 248.45 ppm) for lufenuron, flufenoxuron and hexaflumuron, respectively. The results showed significant (P < 0.05) increase of mortality in larvae treated with different tested CSIs compounds. Mortality was greater in larvae treated by hexaflumuron than lufenuron and flufenoxuron. The main metabolites were tested in the larval whole-body tissue homogenate and findings could be summarized as follows: tested concentrations of CSIs (a) predominantly reduced the total carbohydrate, protein, lipid and cholesterol content at certain ages tested. (b) Disturbed the total carbohydrate content particularly for larvae treated with LC75 concentration of hexaflumuron. (c) Exerted the protein and lipid profiles and this effect was much more pronounced in larvae treated with hexaflumuron. (d) Reduced the quantitative cholesterol content and this reduction was found to be increased with development.
Tested CSIs in particular hexaflumuron showed remarkable larval toxicity and reduced the main metabolites content in the larval whole-body tissue homogenate of the house fly, M. domestica.
The house fly, M. domestica (Diptera: Muscidae), is a well-known livestock pest of human health importance. It constitutes a worldwide problem wherever poor sanitation and bad hygienic conditions exist (Chintalchere et al., 2020; Hasaballah, 2021). Moreover, the biology and ecology of dipterous flies make it ideal organisms to carry and disseminate human and animal pathogens such as helminth parasites, protozoan cysts, viruses and bacteria (Fotedar et al., 1992; Greenberg, 1973; Hasaballah, 2015, 2018).
Insect growth regulators (IGRs) are class of compounds that have the possibility to interfere with insect developmental processes and are safe for the environment. Moreover, this class provides an opportunity to be used as alternatives to conventional insecticides in the management of insect pests of both agricultural and public health importance (Mondal & Parween, 2000). IGRs have been used in different applications and were described as agents that elicit their primary action on insect metabolism, ultimately interfering and disrupting the process of growth, development when applied during the sensitive period of insect development (Ishaaya & Horowitz, 1997).
Biochemical effects of IGRs on carbohydrate, protein and lipid profiles of insects were extensively tested previously (El-Kordy et al., 1995; Tanani et al., 2012; Shaurub et al., 2020). The quantity of lipids available may be a result of the balance between food catch and maintenance, growth and reproduction need. The balance is disturbed by toxic chemicals. Lipids are important energy source for insects that are regulated by neuroendocrine-controlled feed-back loops (Downer, 1985). IGRs have specific target site actions which adversely interfere with the growth, and development of insects such as reproduction and metamorphosis (Khan, 2021). In addition to mortality induced by IGRs, their sublethal effects on biochemical and biological parameters must be considered. Sub-lethal concentrations of IGRs may possess adverse effects to different stages of insect pests through interfering with metabolism.
Flufenoxuron has shown potential for the control of urban pests such as German cockroach, Blattella germanica (Reid et al., 1992); Coptotermes sp. (Ahmed and French 2013) and Reticuliternes spp. (Getty et al., 2000). Lufenuron has been used in animal health markets for the control of fleas, heartworms and fungal infections on domestic dogs, cats and other animals (Dean et al., 1999; Ben-Ziony & Arzi, 2000). Additionally, hexaflumuron is a powerful insecticide that controls different insect pests such as lepidopteran, coleopteran, homopteran and dipteran pests (Rojas & Morales‐Ramos, 2004).
The aim of this study was to evaluate the larvicidal activity of certain chitin synthesis inhibitors as well as to study their effects on some metabolic parameters such as total carbohydrate, protein, lipid and cholesterol content in the larval whole-body tissue homogenate of the house fly, M. domestica tested at various time intervals.
The Musca domestica colony was obtained from the Medical Insect Research Centre, Dokki, Giza. Egypt. Adults were allowed free access to sugar, and cotton pads soaked in milk powder dissolved in water (10% w/v). Larvae were reared according to the method described by Krafsur et al. (1985) on a mixture of sterilized bran (38 g), milk powder (2 g) and water (60 ml) and maintained under these laboratory conditions 27 ± 2 °C and 70 ± 5% relative humidity. The culture was maintained for several generations at the Laboratory of Entomology, Animal house, Faculty of Science, Al-Azhar University.
Chemicals and application technique
Chemicals were kindly supplied by the Laboratory of Insecticides, Plant Protection Research Institute, Dokki, Giza. Lufenuron (Match 10% EC-CAS No. CG A-184699), N- [2,5-dichlor- o-4-(1,1,2, 3, 3hexa-fluoro-propoxyl) phenyl) amino 2,6 diflubenzamide (CA)]. Flufenoxuron (Cascade 10% ECC- AS No.1014-63-69-8), N- [4-2-chloro-4-(trifluoromethyl) phenoxy]-2-fluorophenyl] amino] carbonyl]- 2, 6-difluorobenzamide. Hexaflumuron (Consult 10%, ECCAS No. 86479), N- (3,5-dichlo-ro-4-(1,1,2,2 tetrafluoroethoxy) phenyl]3-(2,6 difluorobenzoyl) urea. Each compound was dissolved in distilled water to prepare different concentrations of (200, 400, 600 and 800 ppm) for lufenuron and (50, 100, 200 and 400 ppm) for flufenoxuron and hexaflumuron. The larval artificial diet was mixed with different tested concentrations of each compound. Forty individuals of newly 2nd instar larvae of M. domestica were immediately transferred to glass jars containing in the treated media. Four replicates were used for each concentration, while the control larvae were fed on an artificial diet mixed with distilled water.
Larval mortality and biochemical effects
Larval mortality percentage was estimated using the equation of Briggs (1960): larval mortality (%) = A − B/A × 100, where (A) is the number of tested larvae, and (B) is the number of tested pupae. At early 2nd instar larvae, 30 individuals were grouped and weighed for estimating the total carbohydrate, protein, lipid and cholesterol content. Measurements were determined at different time periods (24 h, 48 h and 72 h). These criteria were estimated in the whole-body larval homogenate. Three pools were used as replicates. The collected samples were homogenized by using a fine electric homogenizer tissue grinder for 3 min in centrifuge tube containing 0.5 ml of saline solution. Additional 1.5 ml saline was added to make a total volume of 2 ml of saline in each measurement. After centrifugation at 8000 rpm (in cooling centrifuge), the supernatant was transformed for further metabolite measurements using Pye Unicam SP6-450 Uv/Vis 50 spectrophotometer. Determination of the total carbohydrates was processed according to Singh and Sinha (1977). Determination of the total protein was processed according to Bradford (1976). Determination of total lipid was processed according to the method of Knight et al. (1972). Determination of the total cholesterol was made by the enzymatic colorimetric method of Richmond (1973). Results were expressed in mg per gm of fresh body weight.
One-way analysis of variance (ANOVA), confidence limits and Chi-square values were estimated using statistical package for social sciences (SPSS ver., 25). Pairwise comparisons between samples were made using Holm Sidak post hoc method. P value was considered significant at < 0.05. Larval mortality data were subjected to probit analysis to calculate the LC25 and LC75 values. Results were represented as mean ± SD.
The larvicidal activity of tested CSIs, lufenuron, flufenoxuron and hexaflumuron using different concentrations, was tested against 2nd instar larvae of the house fly, M. domestica (Table 1). Larval mortality increased significantly (P < 0.05) with tested concentrations. Hexaflumuron exhibited the most pronounced larval control pattern with complete larval mortality achieved at 400 ppm, while the same mortality percentages were achieved at (1000 ppm for lufenuron) and (> 400 ppm for flufenoxuron). From the probit analysis results, LC25 and LC75 values recorded (166.14 and 732.33 ppm), (68.33 and 283.02 ppm) and (56.43 and 248.45 ppm) for lufenuron, flufenoxuron and hexaflumuron, respectively.
According to the data assorted in Table 2, the total carbohydrate content in the untreated larvae whole-body tissue homogenate increased with developmental time and it recorded (25.6 ± 1.7; 27.3 ± 1.8; and 29.4 ± 1.6 mg/g fresh body weight) at 24 h, 48 h and 72 h, respectively, while total carbohydrate content remarkably decreased after treatment with lufenuron, flufenoxuron and hexaflumuron. The most notable reduction was for hexaflumuron (- 43.1) for larvae tested 72-h post-treatment. In general, considerable reduction in carbohydrate content was noticed in almost all treatments (Table 2).
As regard to total protein content, no specific trend was detected for the control congeners tested at different time intervals, while CSIs severely induced protein profile particularly for larvae tested 48-h and 72-h post-treatment. Hexaflumuron was comparatively the most potent tested CSI with notable increased protein content. From another point of view, treatment with LC75 concentration slightly promoted the total protein content of treated larvae with different tested CSIs. In Table 3, the obtained data revealed increased stimulation of the total protein content for larvae tested 48-h and 72-h post-treatment, but the most notable effect was recorded for larvae tested after 48 h of hexaflumuron treatment (+ 30.8).
The total lipid content of larvae treated with LC25 compared with the control is summarized in Table 4. Data showed a marked decrease in the total lipid content induced by lufenuron, flufenoxuron and hexaflumuron compounds for larvae tested 24-h, 48-h and 72-h post-treatment (Table 4). Hexaflumuron showed the highest reduction percentage (− 47.4) for larvae tested 48-h post-treatment, while flufenoxuron recorded the highest reduction percentage (− 59.8) for larvae tested 48-h post-treatment. In addition, the perturbation of the total lipid content was also recorded for larvae treated with LC75 concentrations. The total lipid content was obviously declined regardless of the tested compounds. The prevalent reducing potency of each compound was gradually increased with the progression of time intervals. The most potent reduction of lipid profile was recorded for hexaflumuron compound in larvae tested 48-h and 72-h post-treatment with reduction percentages of (- 24.6 and—49.8), respectively, compared to the control congeners.
As clearly shown in Fig. 1, tested CSIs unexceptionally exhibited inhibitory effect on the total cholesterol content in fresh body weight 2nd instar larvae. Also, tested CSIs reduced the total cholesterol content, and this decrease was found to be increased with development of treated 2nd instar larvae. Hexaflumuron deteriorated the total cholesterol content, and the maximum reductions (that reached up till -54.2) were exhibited for larvae treated with LC25 concentrations. Additionally, LC75 concentration exerted the most potent reducing action of the total cholesterol content in the fresh body weight for larvae tested at different time intervals. Total cholesterol content reduced to (48.7, 52.1 and 58.7%) for larvae tested 24-h, 48-h and 72-h post-treatment, respectively, compared to the control congeners (Fig. 1).
Insect growth regulators (IGRs) are characterized by instant biodegradation, low toxicity and safety to surrounding environment. Chitin synthesis inhibitors (CSIs) are IGRs inhibit molting or produce a deficient cuticle and are considered as effective development suppressors for the entire life cycle of insect pests (Hammock & Quistad, 1981). Although their effects on the same species differ excessively, tested compounds, namely lufenuron, flufenoxuron and hexaflumuron, belong to the same group of IGRs and have the same mode of action (Nasr et al., 2020).
The present study showed that larval mortality increased significantly (P < 0.05) with the increase in tested concentrations. Hexaflumuron exhibited potential control agent for M. domestica larvae with complete larval mortality achieved at concentration of 400 ppm. The recorded LC25 were (166.11, 68.33 and 56.43 ppm) and LC75 values were (732.33, 283.02 and 248.45 ppm) for lufenuron, flufenoxuron and hexaflumuron, respectively. Similar results were obtained by (Vazirianzadeh et al., 2007) who found that cyromazine and triflumuron have to be applied in house fly larvae control programs; Donahue et al. (2017) found similar results when applied cyromazine against Musca domestica, Stomoxys calcitrans and Fannia canicularis; Nasr et al. (2020) tested the same CSIs against the house fly, M. domestica and found that the least toxicity values of tested sub-lethal concentrations were displayed for lufenuron, while hexaflumuron scored the highest toxicity followed by flufenoxuron.
Insects share with other invertebrates the common pathways of carbohydrate and lipid metabolism. Although much has been presumed based on overt similarities to more extensive studies on mammals and higher taxa, many aspects of intermediary metabolism have been examined in several insects and different insect tissues including synthesis and storage of carbohydrates and fats. Carbohydrates provide energy for muscles, fuel for nervous system, help in fat metabolism and prevent protein from being used as energy. The production or utilization of carbohydrates as affected by tested IGRs was tested previously (Gäde, 2004). The carbohydrate reserves differ with different developmental stages of insect, and synthesis of carbohydrates is usually affected by tested CSIs (Shen et al., 2018; Wang et al., 2018). In this study, three vital CSIs (a class of IGRs) were experimented to determine their effects on the carbohydrate in the fresh body weight of the 2nd larval instar of the house fly, M. domestica. Obtained data clearly displayed considerable reduction in the total carbohydrate content as compared with the control. Some previous studies reported elevated carbohydrate content in tested insect species as a response to the action of tested IGRs, such as El-Kordy (1985) using triflumuron and diflubenzuron against M. domestica; Abuo El-Ela et al. (1990) who stated that treatment of M. domestica larvae with altosid (ZR-515) led to decrease in carbohydrates in 1-day-old pupae and increased in 3- and 5-day-old pupae. Others reported opposite results (El-Kordy et al., 1995; Tanani et al., 2012). Contradictory findings may be due to differences in species sensitivity, potency of the IGRs or the selected developmental stage.
Proteins are biological macromolecules consisting of one or more long chains of amino acid. Protein synthesis is necessary for growth and reproduction. Proteins are essential for cell division and to control chemical reactions in the process of cell metabolism. In the current study, no certain trend recorded for the total protein content of larvae tested 24-h post-treatment. Tested CSIs severely induced protein profile particularly for those larvae tested at 48-h and 72-h post-treatment. Hexaflumuron was comparatively the most potent tested CSI with notable increase in protein content. These results are in agreement with Amer 1990 who found an increase in protein content of S. littoralis pupae after larval treatment with the anti-Juvenile hormone mevalonic acid; Basiouny (2000) who estimated considerable increments of proteins throughout different developmental stages of Muscina stabulans after treatment of larvae with IKI-7899 and XRD-473; Ul Haq et al., 2010 who recorded increase in protein profile of the fly, Bactrocera cucurbitae as a response to the juvenile hormone analogue, methoprene. The explanation of these results obviously indicates the disturbing effect of IGRs or even CSIs on protein profile that may interrupted the hormonal balance or enzymatic hierarchy in insects that reflect their effects on growth, development, morphogenesis reproduction as reported previously (Bakr et al., 2008; Cloyd, 2003). However, these increasing trends in the total protein may be attributed to failure in the insect tissues to uptake the produced and released proteins from fat body and hemolymph during the pupal or adult apolysis.
The total lipid content was found to be decreased as induced by lufenuron, flufenoxuron and hexaflumuron compounds in larvae tested 24-h, 48-h and 72-h post-treatment. The most pronounced effect was recorded for larvae treated with hexaflumuron. This result is in harmony with (Ahmad et al., 1989) who recorded decrease in the total lipid content in cotton leaf worm Spodoptera littoralis (boisduval) as a response to Bay Sir-8514 application; Amer et al., 2005 who found that Diofenolan treatments remarkably reduced the lipid content along the pupal stage of M. domestica; additionally, Perveen (2011) applied the sublethal doses of Chlorfluazuron at LC10 and LC30 to determine the reduction in the total lipid content in Spodoptera litura; Djemaoun et al., (2015) reported the same results when treated Blattella germanica with indoxacarb. In general, tested IGRs pronouncedly interfere with not only the synthesis of lipids but also their mobilization as promoted to be converted into other metabolites or fatty acids that were considered as important indicators for chemical stress (Moreau et al., 2002).
Most insects have cholesterol as their dominant body sterol, which serve as vital cellular membrane constituent that allow rigidity and permeability; additionally, they are essential precursors to steroid hormones that required for ecdysone and other metabolic processes such as molting and metamorphosis. Herein, tested CSIs reduced the total cholesterol content, and this decrease was found to be development dependent. Higher concentrations exerted reduction of the total cholesterol content in the fresh body weight for larvae tested at different time intervals. Similarly, flufenoxuron treatments caused increased activity of β-esterase, while Alpha-esterase was increased after treatment with hexaflumuron in S. littoralis (Mohamed & Azab, 2002); Shakeet and Bakshi (2010) found that monocrotophos and cypermethrin deduce the reduction cholesterol in Chrotogonus trachypterus; additionally, the total esterase activity was elevated with acetamiprid, bifenthrin, chlorpyriphos, deltamethrin, emamectin benzoate, fipronil, imidacloprid, profenophos and lufenuron when tested against M. domestica (Farooq & Freed, 2018). Overall, lipid turnover is regulated by neuroendocrine-controlled feedback loops that may explain the decrements in the total cholesterol which with other metabolites are essential for molting and further development.
Relatively low lethal concentrations were obtained in particular those of hexaflumuron against the public heath important house fly, M. domestica. Based on obtained results, tested chitin synthesis inhibitors CSIs, namely lufenuron; flufenoxuron and hexaflumuron, generally obstructed the constituents of the total carbohydrate, protein, lipid and cholesterol in the penultimate larval instar. Thus, it could be concluded that tested CSIs—which are considered as environmentally safe alternatives to synthetic chemical insecticides—may have a promising role in integrated management programs for the house fly.
Availability of data and materials
The dataset used during the current study is available on reasonable request.
Chitin synthesis inhibitors
Insect growth regulators
Analysis of variance
Part per million
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Tanani, M.A., Hasaballah, A.I. & Hussein, R.M. Assessment of the perturbation induced by chitin synthesis inhibitors lufenuron, flufenoxuron and hexaflumuron in the house fly, Musca domestica vicina (Diptera: Muscidae). JoBAZ 83, 29 (2022). https://doi.org/10.1186/s41936-022-00291-w
- M. domestica vicina