The Resource Modulation of inflammatory responses by Sutherlandia frutescens, by Wei Lei

Modulation of inflammatory responses by Sutherlandia frutescens, by Wei Lei

Label
Modulation of inflammatory responses by Sutherlandia frutescens
Title
Modulation of inflammatory responses by Sutherlandia frutescens
Statement of responsibility
by Wei Lei
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
Sutherlandia frutescens (L.) R. Br (Lessertia frutescens) is a medicinal plant traditionally used in southern Africa. It has been used for patients suffering from numerous types of cancer, infectious diseases, and various inflammatory conditions. This study was designed to determine the impact of S. frutescens on the inflammatory response and anti-microbial activities on cell and/or animal models. Aqueous and ethanolic extracts of S. frutescens were made and verified using HPLC. These extracts were used to treat murine macrophages (e.g., RAW 264.7 cells and primary macrophages isolated from mice) to evaluate the impact of S. frutescens on in vitro inflammatory responses. This study found that the aqueous extract and a polysaccharide-enriched fraction from the aqueous extract exhibited an immuno-stimulatory activity on murine macrophages. Treatment with aqueous extract or polysaccharides increased the production of reactive oxygen species (ROS), nitric oxide (NO), and inflammatory cytokines/chemokines via activating the toll-like receptor 4 signaling pathway. On the other hand, the ethanolic extract of S. frutescens dose-dependently decreased the production of ROS, NO, inducible nitric oxide synthase (iNOS), and various inflammatory cytokines and chemokines in murine macrophages co-stimulated with lipopolysaccharide (LPS) and interferon gamma (IFN[gamma]). Follow up experiments demonstrated that the anti-inflammatory activity of the ethanolic extract was mediated via reductions in the activation of NF-[kappa]B, extracellular-signal-regulated kinase 1/2 (ERK1/2), and signal transducers and activators of transcription 1 (STAT1). RNA sequencing provided more evidences to support the anti-inflammatory activity of the ethanolic extract of S. frutescens. To our surprise, chlorophylls isolated from S. frutescens had a greater effect on the anti-inflammatory of S. frutescens than that of unique compounds (i.e., sutherlandiosides and sutherlandins). To investigate the impact of oral consumption of S. frutescens on in vivo inflammatory responses and anti-microbial activities, mice were fed with AIN-93G based diet with/without containing ground S. frutescens powder or were gavaged with S. frutescens extracts followed by challenge with E. coli or LPS. These experiments found that oral consumption of S. frutescens had limited or no impact on the in vivo inflammatory responses and anti-microbial activities. Overall, this study provide a better understanding on the beneficial therapeutic properties of S. frutescens using in vitro models, however these studies in a laboratory mouse model suggest that consumption of S. frutescens had only a modest impact on host anti-microbial and inflammatory responses to a gram-negative microbial challenge whether intact microbes or bacterial endotoxin (i.e., LPS) was used
Cataloging source
MUU
http://library.link/vocab/creatorDate
1981-
http://library.link/vocab/creatorName
Lei, Wei
Degree
Ph. D.
Dissertation note
Thesis
Dissertation year
2015.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorDate
1958-
http://library.link/vocab/relatedWorkOrContributorName
Fritsche, Kevin L.
http://library.link/vocab/subjectName
  • Medicinal plants
  • Inflammation
  • Anti-infective agents
  • Macrophages
  • Diseases
  • South Africa
Label
Modulation of inflammatory responses by Sutherlandia frutescens, by Wei Lei
Instantiates
Publication
Note
  • "A Dissertation presented to the Faculty of the Graduate School at the University of Missouri-Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation supervisor: Dr. Kevin Fritsche
  • Includes vita
  • Abstract from short.pdf file
Bibliography note
Includes bibliographical references (pages 148-164)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
973225990
Extent
1 online resource (xxiii, 205 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)973225990
Label
Modulation of inflammatory responses by Sutherlandia frutescens, by Wei Lei
Publication
Note
  • "A Dissertation presented to the Faculty of the Graduate School at the University of Missouri-Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation supervisor: Dr. Kevin Fritsche
  • Includes vita
  • Abstract from short.pdf file
Bibliography note
Includes bibliographical references (pages 148-164)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
973225990
Extent
1 online resource (xxiii, 205 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)973225990

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