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Mohammed MMD, Heikal EA, Ellessy FM, Aboushousha T, Ghareeb MA. Comprehensive chemical profiling of Bassia indica Wight. aerial parts extract using UPLC-ESI-MS/MS, and its antiparasitic activity in Trichinella spiralis infected mice: in silico supported in vivo study. BMC Complement Med Ther 2023; 23:161. [PMID: 37202749 DOI: 10.1186/s12906-023-03988-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 05/05/2023] [Indexed: 05/20/2023] Open
Abstract
BACKGROUND Trichinellosis is a public health threat infected both animals and humans as a result of eating undercooked meat. It caused by Trichinella spiralis that has widespread drug resistance and even developed many sophisticated strategies for their survival, this increases the demand in searching for new anthelmintic drugs from natural source. METHODS Our objectives were to test the in vitro and in vivo anthelmintic activity of Bassia indica BuOH frac., and to characterize its chemical composition using UPLC-ESI-MS/MS. Besides an in silico molecular docking study with the prediction of the PreADMET properties. RESULTS In vitro investigation of B. indica BuOH frac., showed severe destruction of the adult worm and larvae, marked cuticle swelling, areas with vesicles, blebs and loss of annulations. This was assured via in vivo study, which revealed a significant reduction (P < 0.05) in the mean adult worm count with efficacy of 47.8% along with a significant decrease (P < 0.001) in the mean larval count per gram muscle with efficacy 80.7%. Histopathological examinations of the small intestine and muscular sections showed marked improvement. In addition, immunohistochemical findings demonstrated that B. indica BuOH frac. depressed the proinflammatory cytokines expressions of TNF-α, which was obviously upregulated by T. spiralis. Precise chemical investigation of the BuOH frac. using UPLC-ESI-MS/MS resulted in the identification of 13 oleanolic type triterpenoid saponins; oleanolic acid 3-O-6´-O-methyl-β-D-glucurono-pyranoside (1), chikusetsusaponin-IVa (2) and its methyl ester (3), chikusetsusaponin IV (4) and its methyl ester (5), momordin-Ic (6) and its methyl ester (7), betavulgaroside-I (8), -II (9) -IV (10), -X (11), licorice-saponin-C2 (12) and -J2 (13). In addition, 6 more phenolics were identified as syringaresinol (14), 3,4-di-O-caffeoylquinic acid (15), 3-O-caffeoyl-4-O-dihydrocaffeoylquinic acid (16), 3,4-di-O-caffeoylquinic acid butyl ester (17), 3,5-di-O-galloyl-4-O-digalloylquinic acid (18) and quercetin 3-O-(6´´-feruloyl)-sophoroside (19). The auspicious anthelmintic activity was further ascertained using in silico molecular docking approach that targeted certain protein receptors (β-tubulin monomer, tumor necrosis factor alpha (TNF-α), cysteine protease (Ts-CF1), calreticulin protein (Ts-CRT)), all the docked compounds (1-19) fit into the binding site of the active pocket with binding affinities noteworthy than albendazole. In addition, ADMET properties, drug score and drug likeness were predicted for all compounds.
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Affiliation(s)
- Magdy M D Mohammed
- Pharmacognosy Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Dokki-12622, Cairo, Egypt.
| | - Elham A Heikal
- Department of Medical Parasitology, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Fatma M Ellessy
- Department of Medical Parasitology, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Tarek Aboushousha
- Department of Pathology, Theodor Bilharz Research Institute, Kornaish El-Nile, Warrak El-Hadar, Imbaba, (P.O. 30), Giza, 12411, Egypt
| | - Mosad A Ghareeb
- Medicinal Chemistry Department, Theodor Bilharz Research Institute, Kornaish El-Nile, Warrak El-Hadar, Imbaba, (P.O. 30), Giza, 12411, Egypt
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El-Wakil ES, Shaker S, Aboushousha T, Abdel-Hameed ESS, Osman EEA. In vitro and in vivo anthelmintic and chemical studies of Cyperus rotundus L. extracts. BMC Complement Med Ther 2023; 23:15. [PMID: 36658562 PMCID: PMC9850539 DOI: 10.1186/s12906-023-03839-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 01/10/2023] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Trichinellosis, a zoonosis caused by the genus Trichinella, is a widespread foodborne disease. Albendazole, one of the benzimidazole derivatives, is used for treating human trichinellosis, but with limited efficacy in killing the encysted larvae and numerous adverse effects. Cyperus rotundus L. is a herbal plant with a wide range of medicinal uses, including antiparasitic, and is frequently used in traditional medicine to treat various illnesses. METHODS LC-ESI-MS was used to identify the active phytoconstituents in the methanol extract (MeOH ext.) of the aerial parts of C. rotundus and its derivate fractions ethyl acetate (EtOAc fr.), petroleum ether (pet-ether fr.), and normal butanol (n-BuOH fr.). The in vivo therapeutic effects of C. rotundus fractions of the extracts were evaluated using the fraction that showed the most promising effect after detecting their in vitro anti-Trichinella spiralis potential. RESULTS C. rotundus extracts are rich in different phytochemicals, and the LC-ESI-MS of the 90% methanol extract identified 26 phenolic compounds classified as phenolic acids, flavonoids, and organic acids. The in vitro studies showed that C. rotundus extracts had a lethal effect on T. spiralis adults, and the LC50 were 156.12 µg/ml, 294.67 µg/ml, 82.09 µg/ml, and 73.16 µg/ml in 90% MeOH ext., EtOAc fr., pet-ether fr. and n-BuOH fr., respectively. The n-BuOH fr. was shown to have the most promising effects in the in vitro studies, which was confirmed by scanning electron microscopy. The in vivo effects of n-BuOH fr. alone and in combination with albendazole using a mouse model were evaluated by counting adults in the small intestine and larvae in the muscles, in addition to the histopathological changes in the small intestine and the muscles. In the treated groups, there was a significant decrease in the number of adults and larvae compared to the control group. Histopathologically, treated groups showed a remarkable improvement in the small intestine and muscle changes. Remarkably, maximal therapeutic effects were detected in the combination therapy compared to each monotherapy. CONCLUSION Accordingly, C. rotundus extracts may have anti-T. spiralis potential, particularly when combined with albendazole, and they may be used as synergistic to anti-T. spiralis medication therapy.
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Affiliation(s)
- Eman S. El-Wakil
- grid.420091.e0000 0001 0165 571XDepartment of Parasitology, Theodor Bilharz Research Institute, Kornaish El-Nile St, 12411 Giza, Egypt
| | - Shimaa Shaker
- grid.420091.e0000 0001 0165 571XDepartment of Parasitology, Theodor Bilharz Research Institute, Kornaish El-Nile St, 12411 Giza, Egypt
| | - Tarek Aboushousha
- grid.420091.e0000 0001 0165 571XDepartment of Pathology, Theodor Bilharz Research Institute, Kornaish El-Nile St, 12411 Giza, Egypt
| | - El-Sayed S. Abdel-Hameed
- grid.420091.e0000 0001 0165 571XDepartment of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St, 12411 Giza, Egypt
| | - Ezzat E. A. Osman
- grid.420091.e0000 0001 0165 571XDepartment of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St, 12411 Giza, Egypt
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ElGhannam M, Dar Y, ElMehlawy MH, Mokhtar FA, Bakr L. Eugenol; Effective Anthelmintic Compound against Foodborne Parasite Trichinella spiralis Muscle Larvae and Adult. Pathogens 2023; 12:pathogens12010127. [PMID: 36678475 PMCID: PMC9862024 DOI: 10.3390/pathogens12010127] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/04/2023] [Accepted: 01/07/2023] [Indexed: 01/14/2023] Open
Abstract
Trichinosis is a foodborne parasitic infection that results from ingestion of raw or under-cooked pork meat infected by parasitic nematode Trichinella spiralis with cosmopolitan distribution. Anthelmintic drugs are used to eliminate intestinal adult parasites and larvae as well as tissue-migrating newborn and in-turn encysted larvae. However, eliminating the infection or averting it from transmission is rarely possible using anthelmintic groups of benzimidazole derivatives. Eugenol (EO) is the main extracted constituent of clove oil (80−90%) and is responsible for its aroma. Therefore, this study aims to investigate the effect of eugenol on both adult and muscle larvae of Trichinella spiralis in vitro. IC50 for different concentrations of eugenol were calculated for both muscle larvae (187.5 µM) and adults (190.4 µM) to determine the accurate dose range. Both the nematode stages were cultured in the commonly used RPMI-1640 media in 24-well plates. Different concentrations of eugenol (122, 305, 609, 1218, and 3045 µM) were administered in different groups of larvae/adults. The parasitological parameters were monitored after 1, 3, 6, 10, 24 h for each EO concentration in concomitant with the control groups. Reference chemotherapeutic anthelminthic drug “albendazole” (at dose 377 µM) was experimentally grouped in triplicates as positive control and the untreated as negative control, respectively. Mortality was observed where time-dependent adult stages were less susceptible than muscle larvae. Eugenol achieved 100% efficacy against T. spiralis larvae and killed the total larvae after 10 and 24 h at concentrations of 1218 and 3045 µM, the same as albendazole’s effect on the positive control group. In regard to adults, resembling muscle larvae (ML), a significant effect of both concentrations at p < 0.0001 was obtained, and the concentration × time interaction was significant at p < 0.0001. Furthermore, the treated/untreated adult and muscle larvae were collected and processed for scanning electron microscopy (SEM). Massive destruction of parasite burden was observed, especially at high concentrations (1218 and 3045 µM). In addition, complete and mild loss in cuticular striation in both the treated and positive controls were confirmed by SEM, respectively, in comparison to the control untreated group.
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Affiliation(s)
- Mai ElGhannam
- Zoology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
- Correspondence: (M.E.); (M.H.E.); (F.A.M.)
| | - Yasser Dar
- Zoology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Mostafa Hassan ElMehlawy
- Zoology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
- Correspondence: (M.E.); (M.H.E.); (F.A.M.)
| | - Fatma A. Mokhtar
- Department of Pharmacognosy, Faculty of Pharmacy, Al Salam University, Kafr El-Zayat 31611, Egypt
- Correspondence: (M.E.); (M.H.E.); (F.A.M.)
| | - Lamia Bakr
- Zoology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
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Sh. Mohammed H, Ghareeb MA, Aboushousha T, Adel Heikal E, Abu El wafa SA. An appraisal of Luffa aegyptiaca extract and its isolated triterpenoidal saponins in Trichinella spiralis murine models. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Evaluation of Annona muricata (Graviola) leaves activity against experimental trichinellosis: in vitro and in vivo studies. J Helminthol 2021; 95:e53. [PMID: 34515021 DOI: 10.1017/s0022149x21000481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Our work aimed to evaluate the possible effect of Annona muricata (Graviola) leaf extract on Trichinella spiralis in in vitro and in vivo studies. Trichinella spiralis worms were isolated from infected mice and transferred to three culture media - group I (with no drugs), group II (contained Graviola) and group III (contained albendazole) - then they were examined using the electron microscope. In the in vivo study, mice were divided into five groups: GI (infected untreated), GII (prophylactically treated with Graviola for seven days before infection), GIII (infected and treated with Graviola), GIV (infected and treated with albendazole) and GV (infected and treated with a combination of Graviola plus albendazole in half doses). Drug effects were assessed by adults and larvae load beside the histopathological small intestinal and muscular changes. A significant reduction of adult and larval counts occurred in treated groups in comparison to the control group. Histopathologically, marked improvement in the small intestinal and muscular changes was observed in treated groups. Also, massive destruction of the cultured adults' cuticle was detected in both drugs. This study revealed that Graviola leaves have potential activity against trichinellosis, especially in combination with albendazole, and could serve as an adjuvant to anti-trichinellosis drug therapy.
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Michael E, Bundy DA. Density dependence in establishment, growth and worm fecundity in intestinal helminthiasis: the population biology of Trichuris muris (Nematoda) infection in CBA/Ca mice. Parasitology 1989; 98 Pt 3:451-8. [PMID: 2771451 DOI: 10.1017/s0031182000061540] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The results are presented of an experimental study of the population biology of chronic Trichuris muris (Nematoda) infection in cortisone-treated CBA/Ca mice. Attention is focused upon both the validity of the common use of faecal egg counts to demonstrate density dependence in helminth fecundity, and the identification of other possible density-dependent mechanisms that may regulate worm numbers in chronic trichuriasis. The results show that faecal egg counts, although demonstrating high daily variation, are not an artefact of host faecal output but a significant density-dependent function of worm burden. This finding contrasts with the observations on Heligmosomoides polygyrus infection in outbred MFI mice, but accords with similar studies in a wide variety of host - helminth systems. Worm establishment in the murine host is found to be a density related function of infection dose. This is attributed to the probable existence of a physical gut-carrying capacity in the murine host for T. muris. Worm distribution in the gut is also shown to the density dependent, with worms being displaced from the caecum to the colon at increasing intensities of infection. The sex ratio of the adult parasites, however, is found to be both unitary and independent of worm burden. Evidence for a significant density-dependent decline in female T. muris growth or size is presented. The results also show a significant positive association between female T. muris weight and per capita fecundity. These findings indicate that the stunted growth of individual worms at high parasite densities may be a potential mechanism underlying density dependence in helminth fecundity.
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Affiliation(s)
- E Michael
- Department of Pure and Applied Biology, Imperial College, University of London
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Rose ME, Wakelin D, Joysey HS, Hesketh P. Immunity to coccidiosis: T-cell control of infection with Eimeria vermiformis in mice does not require co-operation with inflammatory cells. Parasite Immunol 1989; 11:231-9. [PMID: 2788856 DOI: 10.1111/j.1365-3024.1989.tb00662.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The necessity for co-operation between lymphocytes and myeloid-derived inflammatory cells in the mediation of anti-coccidial immunity was investigated using mice infected with Eimeria vermiformis. Reciprocal exchange of immune lymphocytes between H-2 compatible strains of contrasting susceptibility to infection (resistant BALB/B and susceptible C57BL/10) resulted in successful transfer of immunity in both homologous and heterologous exchanges. Recipients of immune cells, whatever their original response phenotype, expressed a high degree of immunity to infection, indicating that the differential susceptibility of the strains is a property of their lymphoid cells and is not attributable to their capacity to mount inflammatory responses. This conclusion was confirmed by the successful adoptive transfer of immunity into NIH mice previously exposed to 600 rad X-irradiation; at this level of irradiation inflammatory responsiveness is severely depressed. Additional confirmation that strain-response phenotype is lymphocyte dependent and that immune lymphocytes can mediate their effects against E. vermiformis without the intervention of inflammatory cells was obtained from studies on the mucosal mast cell response to infection. No correlation existed between the development of intestinal mastocytosis, an index of T-cell-mediated inflammatory responsiveness, and the expression of resistance to E. vermiformis in BALB/c (resistant), C57BL/10 (susceptible) and NIH (susceptible) mice.
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Affiliation(s)
- M E Rose
- Houghton Laboratory, Institute for Animal Health, Huntingdon, Cambridgeshire, UK
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Bolas-Fernandez F, Grencis RK, Wakelin D. Cyclosporin A and Trichinella spiralis: anthelminthic effects in immunosuppressed mice. Parasite Immunol 1988; 10:111-6. [PMID: 3258420 DOI: 10.1111/j.1365-3024.1988.tb00207.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- F Bolas-Fernandez
- MRC Experimental Parasitology Group, Department of Zoology, Nottingham, UK
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Miller HR. The protective mucosal response against gastrointestinal nematodes in ruminants and laboratory animals. Vet Immunol Immunopathol 1984; 6:167-259. [PMID: 6377673 DOI: 10.1016/0165-2427(84)90051-5] [Citation(s) in RCA: 217] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Wassom DL, Brooks BO, Babish JG, David CS. A gene mapping between the S and D regions of the H-2 complex influences resistance to Trichinella spiralis infections of mice. JOURNAL OF IMMUNOGENETICS 1983; 10:371-8. [PMID: 6417245 DOI: 10.1111/j.1744-313x.1983.tb00349.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The strains B10.S(7R), B10.S(23R) and B10.S(24R), all thought to be genetically identical, differ in levels of susceptibility to infection with Trichinella spiralis. In a series of nine independent experiments, B10.S(7R) was shown to be more susceptible than the other two strains. In another series of seven experiments, the strain B10.A(18R) was shown to be more susceptible to infection with T. spiralis than the strains B10.S(21R) or B10.BAR-5, all of which were thought to share common H-2 alleles. These results indicate that a gene mapping between the S and D loci influences susceptibility to infection with T. spiralis. Typing of these strains for Qa and Tl loci rule out the possibility of a double crossover accounting for the differences observed. The new gene is designated Ts-2. Previously published data have also been reinterpreted and another gene Ts-1 is shown to be associated with The A beta locus. When the d allele is expressed at the Ts-2 locus, strains of mice expressing s, q, f or b alleles at Ts-1 are rendered more susceptible to infection.
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Wassom DL, Brooks BO, Cypess RH, David CS. Trichinella spiralis: role of non-H-2 genes in resistance to primary infection in mice. Exp Parasitol 1983; 55:153-8. [PMID: 6403370 DOI: 10.1016/0014-4894(83)90009-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Two strains of mice which share identical H-2 genes but differ in their genetic backgrounds were compared for their ability to resist infection with Trichinella spiralis. The two strains of mice, C3HeB/FeJ and AKR/J, share the H-2k haplotype which is associated with susceptibility to primary infection with T. spiralis in H-2 congenic strains of mice. AKR/J mice, infected with 150 infective muscle larvae, harbored significantly fewer muscle larvae 30 days postinfection than did mice of the strain C3HeB/FeJ. Approximately equal numbers of worms establish in the small intestine of AKR and C3H mice, but the AKR mice expelled adult worms from the gut more rapidly than did mice of the C3H strain. By Day 9 postinfection, 50% of the worms had been expelled by the AKR mice whereas expulsion of worms from C3H mice was delayed beyond Day 9 and occurred primarily between Days 10 and 12. Over this same experimental period (Days 6-12), fecundity of female worms from AKR mice, measured as the mean newborn larvae/female/hour, was approximately one-half that of worms taken from C3H mice. These results support the conclusion that genes outside of the mouse H-2 complex regulate expulsion of adult worms from the gut. These background genes also markedly influence the fecundity of female worms.
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Hagan P, Wakelin D. Nematospiroides dubius: effect of infect on lymphocyte responses to Trichinella spiralis in mice. Exp Parasitol 1982; 54:157-65. [PMID: 7128714 DOI: 10.1016/0014-4894(82)90122-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Pery P. Host-parasite relationship in gastrointestinal helminthiasis. SURVEY OF IMMUNOLOGIC RESEARCH 1982; 1:216-23. [PMID: 6764841 DOI: 10.1007/bf02918459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Krco CJ, David CS, Wassom DL. Characterization of an in vitro proliferation response to solubilized Trichinella spiralis antigens: role of la antigens and Ly-1+ T cells. Cell Immunol 1982; 68:359-67. [PMID: 6807554 DOI: 10.1016/0008-8749(82)90120-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Wakelin D, Donachie AM. Genetic control of immunity to parasites: adoptive transfer of immunity between inbred strains of mice characterized by rapid and slow immune expulsion of Trichinella spiralis. Parasite Immunol 1980; 2:249-60. [PMID: 7194468 DOI: 10.1111/j.1365-3024.1980.tb00057.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Adoptive transfer of immunity with immune mesenteric lymph node cells (IMLNC) was used to analyse the roles of immune and inflammatory events in determining the strain-characteristic time of expulsion of Trichinella spiralis from mice. Transfer of IMLNC within and between three rapidly responding strains (NIH, SWR, DBA1-all H-2q) resulted in accelerated worm expulsion, worm loss commencing before day 8 in each case. When NIH cells were transferred to slow-responder B10 congenic mice (B10G-H-2q) mice, immunity was evident at 8 days as a reduction in worm fecundity and only by 12 days as a reduction in worm numbers. A similar result was obtained when B10G cells were given to B10G recipients. In the reciprocal transfer, IMLNC from B10G transferred immunity to NIH as effectively and as rapidly as did NIH cells. Cells capable of transferring immunity were present in B10G mice as early as 4 days after infection, even though worm expulsion in this strain does not occur until after day 12. Thus following heterologous transfers of IMLNC, the time of worm expulsion was determined by the response of the recipient, and presumably by the ability to generate intestinal inflammatory changes. Earlier work has shown that the strain-characteristic time of worm expulsion is genetically determined, but not by H-2 linked genes. A corollary of the present work is that non-H-2 linked genes control the generation of intestinal inflammatory changes in T. spiralis infections. H-2 genes may control lymphocyte responsiveness to infection and the haplotype H-2q may determine a rapid response. Comparisons are made with the genetic control of resistance to Listeria monocytogenes and possible mechanisms are discussed.
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