Exploring low molecular weight molecules produced by hookworms (Ancylostoma caninum) and their use as anti-inflammatory agents

Shepherd, Catherine (2017) Exploring low molecular weight molecules produced by hookworms (Ancylostoma caninum) and their use as anti-inflammatory agents. PhD thesis, James Cook University.

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View at Publisher Website: https://doi.org/10.25903/5be0cf4ac8546
 
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Abstract

The dog hookworm, Ancylostoma caninum is an experimental model for human hookworm. Relying on the ancient association of hookworms and their host and guided by the observations of the "Old friend's Theory" these parasites may be a valuable source for therapeutic discovery. This thesis is designed to study the small molecules produced by the adult hookworm with particular emphasis on identifying molecules with anti-inflammatory potential using experimental techniques not applied to any helminth previously.

To achieve this primary, aim the small molecular component of hookworm excretory/secretory fluid was extracted and separated. These fractions were separated using the small molecule techniques commonly employed in the study of ethnobotanicals. These extracts were tested in a mouse chemical colitis model known to exhibit Th1/Th17 responses, Th2 type hypertrophy, and innate immune response. This model is employed here as a broad-based bioactivity screen for immunomodulatory potential. Using these combined techniques, it was possible to identify several small molecule fractions exhibit a protective effect in TNBS mouse model of intestinal inflammation. These fractions have the potential to reveal therapeutic candidates for inflammatory disease.

During this study it was also possible to characterise the small molecule secretome of A. caninum using gas chromatography/ mass spectroscopy. This characterisation has been able to describe over 300 features never described for A. caninum. The majority of the molecules have no currently described immunomodulatory activity. This includes low-molecular weight molecules hereto undescribed. In addition to this, a number of metabolites were identified, and these could be assigned to the described pathways of the human hookworm Necator americanus.

It was possible to demonstrate that the small molecule milieu produced by adult dog hookworm is complex. Dog hookworm excretory/secretory material contains small molecule components that when administered to mice can prevent chemical colitis. These molecules present a novel pool of small molecules that have the potential to be used to treat inflammatory disease.

Item ID: 56036
Item Type: Thesis (PhD)
Keywords: allergy/atopy, Ancylostoma caninum, autoimmunity, excretory secretory, hookworm model, human hookworm, immunomodulatory, immunoregulation, inflammation, omics, translational model
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Copyright Information: Copyright © 2017 Catherine Shepherd
Additional Information:

Publications arising from this thesis are available from the Related URLs field. The publications are:

Chapter 2: Shepherd, C., Navarro, S., Wangchuk, P., Wilson, D., Daly, N.L., and Loukas, A. (2015) Identifying the immunomodulatory components of helminths. Parasite Immunology, 37 (6). pp. 293-303.

Chapter 2: Shepherd, Catherine, Wangchuk, Phurpa, and Loukas, Alex (2018) Of dogs and hookworms: man's best friend and his parasites as a model for translational biomedical research. Parasites & Vectors, 11.

Chapter 7: Shepherd, Catherine, Giacomin, Paul, Navarro, Severine, Miller, Catherine M., Loukas, Alex, and Wangchuk, Phurpa (2018) A medicinal plant compound, capnoidine, prevents the onset of inflammation in a mouse model of colitis. Journal of Ethnopharmacology, 211. pp. 17-28.

Date Deposited: 05 Nov 2018 23:28
FoR Codes: 03 CHEMICAL SCIENCES > 0304 Medicinal and Biomolecular Chemistry > 030406 Proteins and Peptides @ 34%
11 MEDICAL AND HEALTH SCIENCES > 1115 Pharmacology and Pharmaceutical Sciences > 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified @ 33%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110309 Infectious Diseases @ 33%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 33%
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920199 Clinical Health (Organs, Diseases and Abnormal Conditions) not elsewhere classified @ 34%
97 EXPANDING KNOWLEDGE > 970111 Expanding Knowledge in the Medical and Health Sciences @ 33%
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