Abstract
In Leishmania mexicana, the protease gp63 has been documented as the protein responsible for cyclooxygenase (COX) activity. The present work aimed to obtain a monoclonal antibody capable of recognizing this protein without blocking the COX-like enzymatic activity. The antibody produced by the selected hybridoma was named D12 mAb. The antigen recognized by the D12 mAb was characterized by the determination of COX activity associated with immune complexes in the presence of exogenous arachidonic acid (AA) using the commercial Activity Assay Abcam kit. LSM-SMS analysis validated the identity of the antigen associated with the D12 mAb as the L. mexicana protease gp63. Confocal microscopy assays with the D12 mAb detected, by cross-recognition, similar proteins in other protozoan parasites. COX-like molecules are located in vesicular structures, homogeneously distributed throughout the cytoplasm in amastigotes (intracellular infectious phase) and promastigotes of L. mexicana, and trophozoites of Entamoeba histolytica, Acanthamoeba castellanii, and Naegleria fowleri. However, in Giardia duodenalis trophozoites, the distribution of the COX-like molecule was also in perinuclear areas. In comparison, in Trypanosoma cruzi trypomastigotes, the distribution was mainly observed in the plasma membrane. Structural analyses of COX-2-like antigens revealed continuous and discontinuous epitopes for B cells, which could be relevant in the cross-reaction of D12 mAb with the analyzed parasites. These results indicate that the D12 mAb against the L. mexicana gp63 also recognizes a COX-like molecule in several protozoan parasites, suggesting that this D12 mAb could potentially be used in combined therapies against infectious diseases.
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Acknowledgements
We thank Dr. Sergio Encarnación-Guevara and Magdalena Hernández-Ortiz from Centro de Ciencias Genómicas, UNAM, for processing samples by LC/MS/MS. We also thank Angélica Leticia Serrano-Ahumada, ascribed to the Bioinformatics, Experimental Medicine Research Unit, Faculty of Medicine, for her valuable participation in the processing and presentation of immunofluorescence images; Jessica Márques-Dueñas for her secretarial assistance, and MVZ Benjamín Emmanuel Chávez-Alvarez for his advice on the mouse immunization process. Axenic amastigotes (MNYC/BZ/62/M379) of L. mexicana were donated, cultured, and maintained by Dr. Alma Escalona-Montaño. Trophozoites of Acanthamoeba castellanii, Entamoeba dispar, Entamoeba invadens, and Naegleria fowleri were cultured and maintained by Biol. Lizbeth Salazar-Villatoro. The trophozoites of Giardia duodenalis were donated and cultured by Dr. Raúl Argüello. Promastigotes of Trypanosoma cruzi were cultured and maintained by Biol. Lidia Baylon.
Funding
This work was supported by CONACyT grant nos. 104108 and A1-S-15223 to PT-R. LAE-F was the recipient of a fellowship from CONACyT (204814).
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VIHR was responsible for interpretation of data, and writing of the manuscript; LEF carried out the D12 mAb production and characterization, in addition, was responsible for COX activity analysis; YM collaborated with the monoclonal antibody production; MRLT was responsible of the determination of COX activity and immunofluorescence assays; ATL was responsible of interpretation of the Mass spectrometry assays; COT carried out the culture of the cells and was responsible of the determination of COX activity present in parasite extracts; PTR and VIHR were responsible of the concept and of the coordination of the experiments. DMM was responsible of the analyzes of the continuous and discontinuous antigenic determinants. PTR was responsible of funding acquirement. All authors contributed critically to the drafts and gave final approval.
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All animal procedures were approved by CINVESTAV’s Institutional Animal Care and Use Committee (CINVESTAV-IACUC). Experiments were performed with animals provided by the Animal Production and Experimentation Unit (UPEAL-CINVESTAV) following the Mexican National Norm (NOM-062-ZOO-1999) specifications, a version of the guide for the care and use of laboratory animals 2011.
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Suppl. Fig. 1.
Purification of COX-like activity from total promastigote extracts using a DEAE-cellulose ion-exchange column. (A) Elution profile of the fractions obtained from the column. Fractions were incubated with exogenous AA and processed according to the commercial kit protocol for COX activity detection. The graph includes the protein quantification values for each fraction eluted from the column. (B) Silver staining analysis of the immune complex. An immunoprecipitation assay was performed, using the fraction with the highest COX activity as antigen (E8-E12) and the commercial gp63 mAb (2 μg of antibody/1 mg of protein). The proteins associated with the immune complex were analyzed in a 10% SDS-PAGE. Arrows indicate the 66 kDa protein and the heavy and light chains of the antibody (IgHC and IgLC). (C) Detection of COX-like activity present in the immune complex. The readings were obtained every 2 min and ended at 20 min. Subsequently, COX activity associated with the D12 mAb was detected (D). In these analyses, an immune complex obtained with the gp63 mAb was also included, considered a positive control. The samples obtained along the immunoprecipitation process were included: material pre-cleared bound to the beads preincubated with the antigen (Pre-clear); material not bound to the beads, that is, the antigen that remains free after the formation of the immune complex (Ub anti-gp63 mAb). In the case of the D12 mAb, it was used a 1:100 dilution. The analyzes were carried out using three biological replicas (ANOVA P< 0.0001). (PNG 157 kb)
Suppl. Fig. 2.
The D12 mAb recognizes an inducible protein in mouse macrophages. (A) The J774A.1 cell line was incubated (a) in the absence of LPS (control) or (b) and (c) in the presence of LPS plus the commercial anti-COX-2 antibody (b) and the supernatant of the D12 clone (c). Image digitalization corresponds to extended focus analysis and represents one experiment with a total of two biological replicates. (B) Analysis of pixel intensity of 100 cells per field, of 3 fields analyzed (ANOVA P< 0.004). (C) Quantification of COX activity in macrophage extracts after adding AA. The results are expressed as Relative Light Units (RLU) (ANOVA P< 0.005). The images are representative of three biological replicas carried out in triplicate. (D) Immunocomplexes were obtained with the commercial anti gp63 mAb from L. mexicana, and the precipitated material was analyzed in a 10% SDS PAGE and transferred to nitrocellulose. Proteins associated with the immune complex were revealed with the D12 mAb. The positive controls were total extracts from LPS-stimulated macrophages and solubilized material from promastigotes (E). Proteins immunoprecipitated with the D12 mAb were analyzed by western blot with the commercial COX-2 pAb. (PNG 750 kb)
Suppl. Fig. 3.
Identification of the antigen precipitated by the D12 antibody. Immune complex analysis by silver-staining of a 10% SDS PAGE. Full lanes are shown. The upper arrow indicates the molecular weight of the 66 kDa protein. Additional arrows indicate the immunoglobulin heavy and light chains (IHC, ILC). (PNG 224 kb)
Suppl. Fig. 4.
Identification of COX-like in trophozoites of Entamoeba histolytica. (a) Subcellular localization of COX-like in cells fixed with 4% p-formaldehyde / PBS and permeabilized with Triton X-100 (0.01%) using the commercial anti-COX-2 polyclonal antibody. As a negative control, a preimmune antibody and trophozoites incubated only with a secondary antibody coupled to FITC were used (data not shown). The cells were analyzed by Confocal Microscopy. (b) Western blot analyses, using the D12 mAb. Soluble fractions of E. histolytica were resolved by 10% SDS-PAGE. As positive controls, total extracts of macrophages stimulated with LPS and promastigotes of L. mexicana were included. The material was transferred to nitrocellulose. Membranes were incubated with the D12 mAb and the commercial anti-COX-2 pAb. The signal developed with an anti-mouse IgG antibody coupled to HRP and detected by chemiluminescence. (PNG 716 kb)
Suppl. Fig. 5.
(A): gp63-like sequences of the five protozoa aligned in BLAST OMEGA. The putative antigenic region is marked with a green parenthesis. (B) Candidate epitopes with identical conserved residues (*) are listed with yellow/magenta/cyan pattern, sequences ID, and respective score value. (PNG 2913 kb)
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Hernández-Ramírez, V.I., Estrada-Figueroa, L.A., Medina, Y. et al. A monoclonal antibody against a Leishmania mexicana COX-like enzymatic activity also recognizes similar proteins in different protozoa of clinical importance. Parasitol Res 122, 479–492 (2023). https://doi.org/10.1007/s00436-022-07746-7
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DOI: https://doi.org/10.1007/s00436-022-07746-7