Specific antibodies in serum of patients with hydatidosis recognised by immunoblotting
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1 1. Med. Microbiol. - Vol. 36 (1992) The Pathological Society of Great Britain and Ireland Specific antibodies in serum of patients with hydatidosis recognised by immunoblotting J. R. KANWAR, S. P. KAUSHIK," I. M. S. SAWHNEY,t M. S. KAMBOJ, S. K. MEHTAS and V. K. VtNAYAKll Departments of Experimental Medicine, General Surgery. t Neurolog y and *Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, and 5 Department of Health Slaughter House, Chandigarh Administration, Chandigarh, India Summary. Hydatid fluids from sheep, goat, pig and man, after resolution by sodium dodecyl sulphate-polyacrylamide gel electrophoresis under reducing conditions, revealed at least 1 5 discrete polypeptide bands of Kda. By ELISA, sera from all 20 cases of hydatidosis showed anti-hydatid antibody, but so did 11 (73%) of 15 sera samples from cysticercosis patients, eight (67%) of 12 sera from patients with other parasitic infections (amoebic liver abscess or hymenolepiasis) and one (4%) of 25 sera from healthy controls. Antibody to cysticercus antigen was found in 14 (93%) of 15 sera from cysticercosis patients, 17 (85%) of 20 sera from hydatid patients, six (50%) of 12 sera from patients with other parasitic infections and one (4%) of 25 sera from healthy controls. Sera from 17 (85%) of 20 hydatid patients, 11 (73%) of 15 cysticercosis patients and five (42%) of 12 patients with other parasitic infections had antibodies to both hydatid and cysticercus antigens. Sera from 20 surgically confirmed cases of hydatidosis reacted with 12 polypeptides of Kda in Western immunoblot with hydatid antigens. Polypeptides of 16,24, 38,45 and 58 Kda were recognised by all hydatidosis sera but also by many sera from patients with other infections. However, polypeptides of 8 and 116 Kda were recognised by all hydatidosis sera but not by any sera from patients with cysticercosis, other parasitic infections or viral hepatitis, or from healthy controls. Thus, recognition of 8- and 116-Kda hydatid antigens by a patient's serum appears to be a specific test confirming a clinical diagnosis in an individual case of hydat idosis. Introduction Echinococcosis is recognised as one of the world's major zoonoses, affecting both man and domestic animals. Rural populations, especially of underdeveloped countries, are at relatively high risk of acquiring hydatid infection because of close proximity with domestic and wild animals.'-3 Disease is mainly due to the physical pressure exerted by the developing hydatid cyst ; the dissemination of protoscolices from the primary site may lead to multiple secondary hydatid cysts.'.' The variable sensitivity and poor specificity of several serological tests2* limit their diagnostic value in suspected cases of hydatidosis. *. ' 7 The recognition of antibody to hydatid antigen 5 in the sera of patients with hydatid~sis,'~~ or of antibody to heat-stable lipoprotein antigen B of Echinococcus granulosus, appeared to provide a specific diagno- Received 9 Jan ; revised version accepted 19 April /i Correspondence should be sent to Dr V. K. Vinayak, Division of Experimental Parasitology and Parasitic Immunology, Department of Experimental Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh , India. sis.""' However, recent investigations revealed crossreactivity of antigen 5 or antigen B in other helminth infections. The present study was designed to investigate the identification of hydatid-specific antibody by Western immunoblot assay, for the immunodiagnosis of hydatidosis. Materials and methods Antigens Fertile hydatid cysts were obtained from sheep, goats and pigs slaughtered at a local abattoir, and from human material after surgical removal. Cyst fluid from either source was aspirated aseptically, centrifuged at for 30min at 4"C, dialysed extensively against distilled water, lyophilised, and stored at -20 C. Protein content was estimated as described by Lowry et al. Analysis of hydatid cyst fluid. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS- PAGE) of lyophilised hydatid fluid was done basically as described by Laemmli.' Briefly, 75 pg of fluid was 46
2 SPECIFIC ANTIBODIES IN SERUM OF PATIENTS WITH HYDATIDOSIS 47 Kda A B C D E Fig. 1. Antigenic profile on SDS-PAGE of hydatid cyst fluid (HCF): lane A, pig HCF; B, human HCF; C, sheep HCF; D, goat HCF; E, sheep HCF. subjected to electrophoresis in stacking gels 5% and separating gels 12% under reducing and denaturing conditions in an electrophoretic cell (BioRad Laboratories, USA) at 25 ma for 6 h, and stained with Coomassie Blue 0.25% (fig. 1). The mol. wt standards were carbonic anhydrase (29 Kda), ovalbumin (45 Kda) and bovine serum albumin (66 Kda). The mol. wts of hydatid antigens were estimated by logarithmic plot of migration of the standards. Serum samples Samples were obtained from confirmed cases of hydatidosis (20), cysticercosis (15), hymenolepiasis (2), amoebic liver abscess (10) and viral hepatitis (12), and from 25 apparently healthy subjects. Hydatidosis. These were radiologically and surgically confirmed cases, and microscopic examination of cyst fluid revealed protoscolices of Echinococcus ; the sera had anti-hydatid antibodies as assessed by plate enzyme-linked immunosorbent assay (ELISA). Cysticercosis. In 13 patients a diagnosis of neurocysticercosis was based on clinical symptoms (headache, nausea, vomiting, impaired vision, confusion, dizziness) and computerised tomography compatible with cysticercosis ; the sera contained anti-cysticercus antibodies as assessed by plate ELISA. Also, two cases of epidermal cysticercosis were confirmed by histopathology. Hymenolepiasis. Stool examination revealed eggs of Hymenolepis nana. Amoebic liver abscess (ALA). These cases had an enlarged and tender liver, palpable abscess, and systemic toxaemia ; the aspirated anchovy-sauce pus was either sterile on bacteriological examination or had Entamoeba histolytica trophozoites. The antiamoebic antibody titres were 264 by indirect haemagglutination. The ALA patients made a good clinical recovery with anti-amoebic therapy (metronidazole or emetine). Viral hepatitis. These patients had detectable levels of hepatitis B surface-antigen by plate ELISA. Healthy controls. These were aged years, resident in India since birth, and showed no abnormality on medical examination. Their sera had no antibody to E. granulosus or Taenia solium ; repeated stool examination revealed no ova or cysts of parasites. Western immunoblo t ting The SDS gel proteins were transferred to nitrocellulose paper (NCP) in a transblot cell (BioRad Laboratories, USA) at 200 ma for 3 h. Non-specific binding sites on NCP strips were blocked with bovine serum albumin (BSA) 3% in Tris saline, ph 7.4, for 3 h at 4 C. Strips were treated for 3 h at 4 C with serum samples diluted 1 in 25 with BSA 0.1%; they were washed three times with Tris saline containing nonidet P % (a non-ionic detergent, to remove excess reactant and to reduce non-specific reactions), and were then incubated with a 1 in 1000 dilution of a conjugate of anti-human immunoglobulin (IgG, IgA and IgM) and horseradish peroxidase (Jackson Immune Research Lab., Baltimore, USA) for 1 h at 4 C. The reaction was developed with 4-chloro-1 -naphthol (Sigma) as substrate. Detection of antibodies by ELISA Antibodies to hydatid antigen were assayed by micro ELISA,13 with hydatid cyst fluid as antigen. Anticysticercus antibodies to crude cysticercus antigen14 were also assayed by micro ELISA.13 Data analysis The sensitivity, specificity, predictive values and diagnostic efficiency of micro-elisa and immunoblot assays were determined as described by Galen and Gambino. l 5 Results SDS-PAGE analysis of hydatid cyst fluid Hydatid fluid from sheep, goat, pig or man, after resolution by SDS-PAGE under reducing conditions, revealed at least 15 discrete polypeptide bands of Kda (fig. l), with a major complex of c. 66 Kda. A 20-Kda polypeptide was found in the fluid from one of the sheep (fig. 1, lane C).
3 48 J. R. KANWAR ET AL. Table I. Detection of antibodies to hydatid and cysticercus antigens by ELISA Sera of patients tested by ELISA against Disease (number of cases) Hydatidosis (20) Cysticercosis (1 5) Other parasitic infection$ (1 2) Viral hepatitis (1 2) Healthy controls (25) hydatid (E. granulosus) antigen cysticercus (T. solium) antigen Number (%) Number (%) Range of OD (Mean, SD) of sera Range of OD (Mean, SD) of sera positive* positive? a99 (1*26,0*37) 20(100) *68 (0.9 1,0*42) 17 (85) (0*85,0-47) 11 (73) (0-41,0.53) 14 (93) 0' (0*64,0-24) 8 (67) (0*46,0* 17) 6 (50) (0*22,0* 12) (0*23,0.10) (0.25,0*14) 1 (4) (0.20,0.12) 1 (4) * OD 2 mean + 2 SD for control sera against hydatid antigen. f OD 2 mean + 2 SD for control sera against cysticercus antigen. # Amoebic liver abscess (lo), hymenolepiasis (2). Detection of anti-hydatid and anti-cysticercus antibodies by plate ELISA The plate ELISA, with sheep hydatid fluid as antigen, gave a mean OD value of 0.25 (SD 0.14) with sera from healthy controls; so, a serum with an OD of not less than 0.53 (mean + 2 SD) was considered to be positive for anti-hydatid antibody. All 20 of the sera from cases of hydatidosis contained anti-hydatid antibody. However, 1 1 (73%) of 15 sera from cysticercosis patients, eight (67%) of 12 sera from ALA and hymenolepiasis patients, and one (4%) of 25 sera from healthy controls also had anti-hydatid antibody (table I). With cysticercus antigen, the mean OD of sera from healthy controls was 0-20 (SD 0.12); so, a serum with an OD of not less than 0.44 (mean+2 SD) was considered to be positive for anti-cysticercus antibody. Fourteen (93%) of 15 sera from cysticercosis patients had anti-cysticercus antibody. However, 17 (85%) of 20 sera from hydatidosis patients, six (50%) of 12 sera from patients with other parasitic infections, and one (4%) of 25 sera from healthy controls also had antibody to cysticercus antigen (table I). The sera from 17 (85%) of 20 patients with hydatidosis contained antibodies to both hydatid and cysticercus antigens; 11 (73%) of 15 sera from cysticercosis patients, and five (42%) of 12 sera from patients with other parasitic infections also had antibodies to both antigens, but none of the sera from viral hepatitis patients or healthy controls had antibodies to both antigens (table 11). Western immunoblot assay with hydatid antigen The sera from cases of hydatidosis showed 12 polypeptides of Kda by Western immunoblot with crude hydatid fluid antigen (fig. 2, lanes A and B). The polypeptides of 16,24,38,45 and 58 Kda were recognised by all sera from hydatid patients but also by some sera from patients with other infections (table 111). The 8- and 116-Kda polypeptides were recognised by the sera from all hydatid patients but by none of the controls or patients with other infections. The 66-Kda polypeptide was strongly recognised by sera from patients with hydatid and other parasitic infections (fig. 2, lanes A-E), but only faintly by sera from viral hepatitis patients (lane F) and healthy controls (lane G). Diagnostic value of ELISA and of immunoblot The detection of anti-hydatid antibody by plate ELISA was found to have a sensitivity of 100% but a Table XI. Proportion of patients and controls whose sera had ELISA antibodies to hydatid antigen (HAg) or cysticercus antigen (CAg) or both antigens Disease (number of cases) I Number of sera with antibody to both HAg CAg neither antigens only only antigen Hydatidosis (20) Cysticercosis (1 5) Other parasitic infections (1 2) Viral hepatitis (12) Healthy controls (25)
4 SPECIFIC ANTIBODIES IN SERUM OF PATIENTS WITH HYDATIDOSIS 49 specificity of only 76%; the diagnostic efficiency was 83% (table IV). The plate ELISA with cysticercus antigen had a sensitivity of 94% and a specificity of 63% for anti-cysticercus antibody; the efficiency of this assay was 84%. Based on the recognition of 8- and 1 16-Kda antigens by the sera of hydatid patients and their nonrecognition by sera from other patients and controls, Western immunoblot assay had both a sensitivity and a specificity of 100% in the diagnosis of hydatidosis (table IV). Discussion A B C D E F G Fig. 2. Western immunoblots of hydatid-cyst-fluid antigens probed with sera from patients with hydatidosis (lanes A and B), hymenolepiasis (C), cysticercosis (D), amoebic liver abscess (E), viral hepatitis (F) and from a healthy control (G). The 8- and 116- Kda bands are specific for hydatidosis. Anti-hydatid antibodies in the sera of hydatidosis patients have been examined by several serological procedure^,^^ 39 l6 with purified thermolabile antigen 5 or thermostable antigen B from the hydatid fluid, or with the crude hydatid fluid as antigen. 14, 163 ' ELISA has been reported to be relatively sensitive and specific,' 69 18* l9 but variable sensitivity has been ascribed to the source and nature of the hydatid antigen. ' ' ' Except for a minor antigenic difference in one of the hydatid fluids that we obtained from a sheep, we found little difference in antigenic cornponents between the hydatid fluids from sheep7 goats, pigs and human cases (fig. 1). We preferred to use Table 111. Patients and controls whose sera reacted with hydatid cyst fluid and its components by ELISA and by immunoblot Disease (number of cases) Hydatidosis (20) Cysticercosis (1 5) Other parasitic infection (1 2) Viral hepatitis (12) Healthy controls (25) Number ("A) of sera reacting with hydatid in immunoblot with hydatid-fluid polypeptide of (Kda) antigen I InELISA (100) 20 (100) 20 (100) 20 (100) 20 (100) 20 (100) 20 (100) 20 (100) 18 (90) 20 (100) 11 (73) 0 lo(67) 7(47) 8 (53) 6(40) 3(20) 15(100) 4(27) 0 8 (67) 0 6(50) 4(33) 4(33) 1(8) 0 12(100) (100) 0 0 1(4) (100) 0 0 Table IV. Diagnostic evaluation of ELISA and immunoblot assay Criteria Sensitivity Specificity Predictive positive Predictive negative Diagnostic efficiency I I hydatid antigen* Percentage value of test for serum antibody by ELISA with cysticercus antigen? by immunoblot with hydatidfluid polypeptide of 8 Kda* 116 Kda* * For diagnosis of hydatidosis. t For diagnosis of cysticercosis.
5 50 J. R. KANWAR ET AL. fluid from sheep because of easy availability and the less likely cross-reaction of host antigens with immunoglobulins in human sera. Elevated anti-hydatid antibody was detected by ELISA in the sera of all 20 cases of hydatidosis; but we found a high degree of non-specificity ranging from 73% in cysticercosis to 67% with other parasitic infections (table I). Interestingly, 17 (85%) of the 20 hydatidosis patients had antibodies to both hydatid and cysticercus antigens (table 11), and 11 (73%) of 15 cysticercosis patients also had antibodies to both antigens. Our data clearly indicated that, though ELISA was sensitive, many non-specific results were obtained, as '-' has been observed by others' 8q s who also concluded that immunological procedures for the detection of antibodies to hydatid antigen have serious limitations because of a high incidence of false positive results. Anti-hydatid antibodies persist for years after the surgical removal of a hydatid Nonspecificity may be caused mainly by a sharing of hydatid antigen with those of other parasites;26 but other possible reasons are interaction with some bloodgroup antigens," or with non-specific host proteins in hydatid fluid.9 Thus, we feel that mere demonstration of antihydatid antibodies does not confirm the clinical diagnosis of hydatidosis. An alternative would be an assay system to identify hydatid-specific antigen in the circulation. Such an immunoassay would require specific antibody; so, a first step would be identification of hydatid-specific antigen(s). Our data show that the polypeptides of 8 and 1 16 Kda were recognised in Western immunoblot assay by the sera of all 20 hydatid patients, but not by any of the sera from patients with other helminth infections, ALA, or viral hepatitis, or from healthy controls (table 111). However, Shepherd and Mc- Manus' have reported 12- and 16-Kda polypeptides as E. granulosus-specific. This difference in mol. wt between their results and ours may be related to the processing of hydatid cyst fluid before electrophoresis : we have loaded fluid directly on the gel; but they processed the fluid by iodination, immunoprecipitation with pooled patients' sera and repeated washing with detergent.' Such treatment is known to alter polarity, size, configuration and optimum concentration of antigenic molecules. *' Recently, Maddison et af.4 reported a specific antigen of 8 Kda, like ours. We conclude that the immunoblot recognition of hydatidspecific 116- or 8-Kda polypeptides by the sera of clinical cases appears to confirm the diagnosis of h ydat i dosi s. References I. Matossian RM. The immunological diagnosis of human hydatid disease. Trans R SOC Trop Med Hyg 1977; 71 : Rjckard MD, Lightowlers MW. Immunodiagnosis of hydatid disease. 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Purification and partial characterization of the major antigen of Echinococcus granulosus (Antigen 5) with monoclonal antibodies. Mol Biochem Parusitoll986; 20: Shepherd JC, McManus DP. Specific and cross-reactive antigens of Echinococcus granulosus hydatid cyst fluid. Mol Biuchem Parasitol1987 ; 25 : Lowry OH, Rosebrough NJ, Farr AL, Randall RJ. Protein measurement with folin phenol reagent. J Biol Chem 1951 ; Laemmli UK. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 1970; 227 : Towbin H, Staehelin T, Gordon J. Electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets : procedure and some applications. Proc Nat Acad Sci USA 1979; 76: Volier A, Bidwell DE, Bartlett A. Enzyme immunoassays in diagnostic medicine. Theory and practice. Bull WHO 1976; 53: Gottstein B, Tsang VCW, Schantz PM. Demonstration of species-specific and cross-reactive components of Taeniu solium metacestode antigens. Am J Trop Med Hyg 1986; 35: Gaien RS, Gambino SR. Beyond normality: the predictive value and efficiency of medical diagnoses. New York, John Wiley and Son. 1975: Hira PR, Bahr GM, Shweiki HM, Behbehani K. An enzymelinked immunosorbent assay using an arc 5 antigen for the diagnosis of cystic hydatid disease. Ann Trop Med Parusitol 1990; 84: Craig PS. Detection of specific circulation antigen, immune complexes and antibodies in human hydatidosis from Turkana (Kenya) and Great Britain, by enzyme-immunoassay. Parasite Immunoll986; 8: Rickard MD, Honey RD, Brumley JL, Mitchell GF. Serological diagnosis of post-operative surveillance of human hydatid disease. 11. The enzyme-linked immunosorbent assay (ELISA) using various antigens. Pathology 1984; 16: Coltorti EA, Fernandez E, Guarnera E, Lago J, Iriarte J. Field evaluation of an enzyme immunoassay for detection of asymptomatic patients in a hydatid control programme. Am J Trop Med Hyg 1988; 38: Gore RW, Sadun EH, Hoff R. Echinococcus granulosus and E. multzlocularis: soluble antigen fluorescent antibody test. Exp Parasitol1970; 2%: , Tassi C, Dottorini S, Scalise G, Geranio N. Echinococcus granulosus : diagnosis of human hydatid disease by the indirect haemoagglutination reaction with antigens from hydatid fluid and scolices. Int J Parusitoll981 ; 11 : Kagan IG. Serodiagnosis of parasitic diseases. In: Rose NR, Friedman H, Fahey JL (eds) Manual of clinical laboratory immunology, 3rd edn. Washington DC, American Society for Microbiology. 1956: Speiser F. Application of the enzyme linked immunosorbent assay (ELISA) for the diagnosis of filariasis and echinococcosis. Tropenmed Parasitoll980; 31 : Afferni C, Pini C, Misiti-Dorello P, Bernardini L, Conchedda
6 SPECIFIC ANTIBODIES IN SERUM OF PATIENTS WITH HYDATIDOSIS 51 M, Vicari G. Detection of specific IgE antibodies in sera from patients with hydatidosis. Clin Exp Immunol 1984; 55 : Gottstein B, Schantz PM, Todorov T, Saimot AG, Jacquier P. An international study on the serological differential diagnosis of human cystic and alveolar echinococcosis. Bull WHO 1986; 64: Larralde C, Montoya RM, Sciutto E, Diaz ML, Govezensky T, Coltorti E. Deciphering western blots of tapeworm antigens (Taenia solium, Echinococcus granulosus, and Taenia crassiceps) reacting with sera from neurocysticercosis and hydatid disease patients. Am J Trop Med Hyg 1989; 40: Hunter WM. Radioimmunoassay. In: Weir DM (ed) Handbook of experimental immunology, 3rd edn. Oxford, Blackwell Scientific Publications :
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