1
|
Ariyaratne A, Kim SY, Pollo SMJ, Perera S, Liu H, Nguyen WNT, Coria AL, Luzzi MDC, Bowron J, Szabo EK, Patel KD, Wasmuth JD, Nair MG, Finney CAM. Trickle infection with Heligmosomoides polygyrus results in decreased worm burdens but increased intestinal inflammation and scarring. Front Immunol 2022; 13:1020056. [PMID: 36569914 PMCID: PMC9773095 DOI: 10.3389/fimmu.2022.1020056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 11/03/2022] [Indexed: 12/13/2022] Open
Abstract
Introduction Intestinal roundworms cause chronic debilitating disease in animals, including humans. Traditional experimental models of these types of infection use a large single-dose infection. However, in natural settings, hosts are exposed to parasites on a regular basis and when mice are exposed to frequent, smaller doses of Heligmosomoides polygyrus, the parasites are cleared more quickly. Whether this more effective host response has any negative consequences for the host is not known. Results Using a trickle model of infection, we found that worm clearance was associated with known resistance-related host responses: increased granuloma and tuft cell numbers, increased levels of granuloma IgG and decreased intestinal transit time, as well as higher serum IgE levels. However, we found that the improved worm clearance was also associated with an inflammatory phenotype in and around the granuloma, increased smooth muscle hypertrophy/hyperplasia, and elevated levels of Adamts gene expression. Discussion To our knowledge, we are the first to identify the involvement of this protein family of matrix metalloproteinases (MMPs) in host responses to helminth infections. Our results highlight the delicate balance between parasite clearance and host tissue damage, which both contribute to host pathology. When continually exposed to parasitic worms, improved clearance comes at a cost.
Collapse
Affiliation(s)
- Anupama Ariyaratne
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Sang Yong Kim
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, United States
| | - Stephen M. J. Pollo
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Shashini Perera
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Hongrui Liu
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - William N. T. Nguyen
- Departments of Physiology and Pharmacology, Faculty of Medicine, University of Calgary, Calgary, AB, Canada
| | - Aralia Leon Coria
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Mayara de Cassia Luzzi
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Joel Bowron
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Edina K. Szabo
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| | - Kamala D. Patel
- Departments of Physiology and Pharmacology, Faculty of Medicine, University of Calgary, Calgary, AB, Canada
| | - James D. Wasmuth
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Meera G. Nair
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, United States
| | - Constance A. M. Finney
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
- Host Parasite Interactions Training Network, University of Calgary, Calgary, AB, Canada
| |
Collapse
|
5
|
Abstract
There is limited data on the human mucosal immune response to geohelminths, but extensive data from experimental animals. Geohelminth infections may modulate mucosal immunity with effects on parasite expulsion or persistence and mucosal inflammation. Geohelminths are considered to have important effects on immunity to mucosal vaccines, infectious disease susceptibility, and anti-inflammatory effects in inflammatory bowel disease and asthma. This review will discuss the findings of studies of human immunity to geohelminths and their potential effects on non-parasite mucosal immune responses. Such effects are likely to be of public health importance in middle- and low-income countries where these parasites are endemic. There is a need for human studies on the effects of geohelminth infections on mucosal immunity and the potential for anthelmintic treatment to modify these effects. Such studies are likely to provide important insights into the regulation of mucosal immunity and inflammation, and the development of more effective mucosal vaccines.
Collapse
|
6
|
Achidi EA, Apinjoh TO, Mbunwe E, Besingi R, Yafi C, Wenjighe Awah N, Ajua A, Anchang JK. Febrile status, malarial parasitaemia and gastro-intestinal helminthiases in schoolchildren resident at different altitudes, in south-western Cameroon. ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY 2008; 102:103-18. [PMID: 18318932 DOI: 10.1179/136485908x252287] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
In the many areas where human malaria and helminthiases are co-endemic, schoolchildren often harbour the heaviest infections and suffer much of the associated morbidity, especially when co-infected. In one such area, the Buea district, in south-western Cameroon, two cross-sectional surveys, together covering 263 apparently healthy schoolchildren aged 4-12 years, were recently conducted. The prevalences of fever, malarial parasitaemia and intestinal helminth infections, the seroprevalences of anti-Plasmodium falciparum IgG and IgE and anti-glycosylphosphatidylinositol (anti-GPI) IgG, plasma concentrations of total IgE, and the incidence of anaemia were all investigated. The mean (S.D.) age of the study children was 7.56 (1.82) years. Overall, 156 (59.3%) of the children were found parasitaemic, with a geometric mean parasitaemia of 565 parasites/microl. Parasitaemia and fever were significantly associated (P=0.042). The children who lived at low altitude, attending schools that lay 400-650 m above sea level, had significantly higher parasitaemias than their high-altitude counterparts (P<0.01). At low altitude, the children attending government schools had significantly higher parasitaemias than their mission-school counterparts (P=0.010). Of the 31 children (11.9%) found anaemic, 22 (70.4%) had mild anaemia and none had severe anaemia. A significant negative correlation (r=-0.224; P=0.005) was observed between haemoglobin concentration and level of parasitaemia. Infection with Plasmodium appeared to reduce erythrocyte counts (P=0.045), a condition that was exacerbated by co-infection with helminths (P=0.035). Plasma concentrations of total IgE were higher in the children found to be excreting helminth eggs than in those who appeared helminth-free, while levels of anti-P. falciparum IgE were higher in the children with low-grade parasitaemias than in those with more intense parasitaemias. Levels of anti-GPI IgG increased with age and were relatively high in the children who lived at low altitude and in those who were aparasitaemic. The survey results confirm that asymptomatic malarial parasitaemia frequently co-exists with helminth infections in schoolchildren and indicate links with fever, altitude and school type. Immunoglobulin E may play a role in immune protection against helminthiasis whereas anti-GPI antibodies may be important in the development of antimalarial immunity in such children. In Cameroon, as in other areas with endemic malaria, control programmes to reduce the prevalences of infections with intestinal helminths and malarial parasites in schoolchildren, which may effectively reduce the incidence of anaemia, are clearly needed.
Collapse
Affiliation(s)
- E A Achidi
- Department of Medical Laboratory Science, Faculty of Health Sciences, University of Buea, Buea, Cameroon.
| | | | | | | | | | | | | | | |
Collapse
|