1
|
Shirozu T, Regilme MAF, Ote M, Sasaki M, Soga A, Bochimoto H, Kawabata H, Umemiya-Shirafuji R, Kanuka H, Fukumoto S. Wolbachia infection in Aedes aegypti does not affect its vectorial capacity for Dirofilaria immitis. Sci Rep 2024; 14:22528. [PMID: 39341970 PMCID: PMC11439018 DOI: 10.1038/s41598-024-73421-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Accepted: 09/17/2024] [Indexed: 10/01/2024] Open
Abstract
Mosquito-borne diseases such as dengue and filariasis are a growing public health concern in endemic countries. Biological approaches, such as the trans-infection of Wolbachia pipientis in mosquitoes, are an alternative vector control strategy, especially for arthropod-borne viruses such as dengue. In the present study, the effect of Wolbachia (wMel strain) on the vectorial capacity of Aedes aegypti for Dirofilaria immitis was studied. Our results showed that Wolbachia does not affect the phenotype of mosquito survival or the prevalence, number, and molting rate of third-stage larvae in both susceptible and resistant strains of Ae. aegypti. RNA-seq analysis of Malpighian tubules at 2 days post-infection with D. immitis showed the differentially expressed genes (DEGs) with and without wMel infection. No characteristic immune-related gene expression patterns were observed among the DEGs. No significant change in the amount of Wolbachia was observed in the Ae. aegypti after D. immitis infection. Our results suggest that infection of D. immitis in Ae. aegypti populations will not interfere with Wolbachia-based vector control strategies in dengue-endemic areas where cases of D. immitis are present. This study demonstrated the veterinary medical validity of a dengue control program using Wolbachia.
Collapse
Affiliation(s)
- Takahiro Shirozu
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Maria Angenica F Regilme
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Manabu Ote
- Department of Tropical Medicine, The Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
- Center for Medical Entomology, The Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
| | - Mizuki Sasaki
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Akira Soga
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Hiroki Bochimoto
- Department of Cell Physiology, The Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
- Health Care Administration Center, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Hidenobu Kawabata
- Health Care Administration Center, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Rika Umemiya-Shirafuji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Hirotaka Kanuka
- Department of Tropical Medicine, The Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
- Center for Medical Entomology, The Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
| | - Shinya Fukumoto
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan.
| |
Collapse
|
2
|
Mizuseki M, Ikeda N, Shirozu T, Yamagishi M, Oshiro S, Fukumoto S. Development of a novel rodent model for dog heartworm microfilaremia using the severe-combined immunodeficiency mouse. Sci Rep 2024; 14:13741. [PMID: 38877072 PMCID: PMC11178764 DOI: 10.1038/s41598-024-63165-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 05/26/2024] [Indexed: 06/16/2024] Open
Abstract
Dirofilaria immitis is a mosquito-borne parasitic nematode that causes fatal heartworm disease in canids. The microfilariae are essential for research, including drug screening and mosquito-parasite interactions. However, no reliable methods for maintaining microfilaria long-term are currently available. Therefore, we used severe combined immunodeficiency (SCID) mice to develop a reliable method for maintaining D. immitis microfilaria. SCID mice were injected intravenously with microfilariae isolated from a D. immitis-infected dog. Microfilariae were detected in blood collected from the tail vein 218 days post-inoculation (dpi) and via cardiac puncture 296 dpi. Microfilariae maintained in and extracted from SCID mice showed infectivity and matured into third-stage larvae (L3s) in the vector mosquito Aedes aegypti. L3s can develop into the fourth stage larvae in vitro. Microfilariae from SCID mice respond normally to ivermectin in vitro. The microfilariae in SCID mice displayed periodicity in the peripheral circulation. The SCID mouse model aided in the separation of microfilariae from cryopreserved specimens. The use of SCID mice enabled the isolation and sustained cultivation of microfilariae from clinical samples. These findings highlight the usefulness of the SCID mouse model for studying D. immitis microfilaremia in canine heartworm research.
Collapse
Affiliation(s)
- Mihoko Mizuseki
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Nao Ikeda
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Takahiro Shirozu
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan
| | | | - Sugao Oshiro
- Yanbaru Animal Clinic, Nago, Okinawa, 905-0019, Japan
| | - Shinya Fukumoto
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido, 080-8555, Japan.
| |
Collapse
|
3
|
Kaushal R, Jahan S, McGregor C, Pineault N. Dimethyl sulfoxide-free cryopreservation solutions for hematopoietic stem cell grafts. Cytotherapy 2021; 24:272-281. [PMID: 34654640 DOI: 10.1016/j.jcyt.2021.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/18/2021] [Accepted: 09/05/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND AIMS The use of effective methods for the cryopreservation of hematopoietic stem cells (HSCs) is vital to retain the maximum engraftment activity of cord blood units (CBUs). Current protocols entail the use of dimethyl sulfoxide (DMSO) as intracellular cryoprotective agent (CPA) and dextran and plasma proteins as extracellular CPAs, but DMSO is known to be cytotoxic, and its infusion in patients is associated with mild to moderate side effects. However, new, commercially available, DMSO-free cryopreservation solutions have been developed, but their capacity to protect HSCs remains poorly investigated. METHODS Herein the authors compared the capacity of four DMSO-free freezing media to cryopreserve cord blood (CB) HSCs: CryoProtectPureSTEM (CPP-STEM), CryoScarless (CSL), CryoNovo P24 (CN) and Pentaisomaltose (PIM). Clinical-grade DMSO/dextran solution was used as control. RESULTS Of the four cryopreservation solutions tested, the best post-thaw cell viability, recovery of viable CD45+ and CD34+ cells and potency were achieved with CPP-STEM, which was equal or superior to that seen with the control DMSO. CSL provided the second best post-thaw results followed by PIM, whereas CN was associated with modest viability and potency. Further work with CPP-STEM revealed that CB CD34-enriched HSCs and progenitors cryopreserved with CPP-STEM maintained high viability and growth expansion activity. In line with this, a pilot transplantation assay confirmed that CPP-STEM-protected CB grafts supported normal short- and long-term engraftment kinetics. CONCLUSIONS The authors' results suggest that new, valuable alternatives to DMSO are now available for the cryopreservation of HSCs and grafts, including CBUs.
Collapse
Affiliation(s)
- Richa Kaushal
- Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada; Centre for Innovation, Canadian Blood Services, Ottawa, Canada
| | - Suria Jahan
- Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada; Centre for Innovation, Canadian Blood Services, Ottawa, Canada
| | | | - Nicolas Pineault
- Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada; Centre for Innovation, Canadian Blood Services, Ottawa, Canada.
| |
Collapse
|