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Identification of human macrophage genes differentially expressed by infection with Mycobacterium tuberculosis Tang, Raymond Kwok-Cheung
Abstract
Mycobacterium tuberculosis infects mononuclear phagocytes and manifests disease by triggering a strong delayed type hypersensitivity response which is detrimental to the host. In most healthy individuals, infection is resolved; however, the bacillus possesses many evasion strategies which may allow it under certain conditions to survive and replicate within the macrophage. M. tuberculosis has been found to alter several host defences to promote its survival so the ability of M. tuberculosis to modulate the expression of genes in human macrophages was investigated, using a novel method which combined subtractive hybridization with differential display. Macrophage genes which appeared to be induced or suppressed by infection were identified and isolated. A total of 25 such cDNAs were isolated. Five of the cDNAs were identified as known genes: NADH ubiquinone oxidoreductase chain 2; p22-phox; an antioxidant enzyme, AOE 37-2; a possible growth arrest gene, B4B; and a human protein phosphatase g. Seven other cDNAs matched human cDNA sequences, and the remaining 13 were novel sequences. Successful quantitation of three cDNAs revealed that two were induced in macrophages infected with M. tuberculosis, while the other was constitutively expressed. In addition, three other cDNAs were also identified to be induced by infection. The sequence of one of the cDNAs matched an IFNinducible nuclear phosphoprotein sequence, another matched a cDNA sequence, while the last one was unique. These cDNAs were clearly induced by infection in THP-1 macrophages; however, a pattern of expression of these clones did not emerge in human peripheral blood macrophages. Further research must be performed before conclusions can be made regarding the expression and function of these clones.
Item Metadata
Title |
Identification of human macrophage genes differentially expressed by infection with Mycobacterium tuberculosis
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
Mycobacterium tuberculosis infects mononuclear phagocytes and manifests disease by triggering
a strong delayed type hypersensitivity response which is detrimental to the host. In most healthy
individuals, infection is resolved; however, the bacillus possesses many evasion strategies which
may allow it under certain conditions to survive and replicate within the macrophage. M.
tuberculosis has been found to alter several host defences to promote its survival so the ability of
M. tuberculosis to modulate the expression of genes in human macrophages was investigated,
using a novel method which combined subtractive hybridization with differential display.
Macrophage genes which appeared to be induced or suppressed by infection were identified and
isolated. A total of 25 such cDNAs were isolated. Five of the cDNAs were identified as known
genes: NADH ubiquinone oxidoreductase chain 2; p22-phox; an antioxidant enzyme, AOE 37-2;
a possible growth arrest gene, B4B; and a human protein phosphatase g. Seven other cDNAs
matched human cDNA sequences, and the remaining 13 were novel sequences. Successful
quantitation of three cDNAs revealed that two were induced in macrophages infected with M.
tuberculosis, while the other was constitutively expressed. In addition, three other cDNAs were
also identified to be induced by infection. The sequence of one of the cDNAs matched an IFNinducible
nuclear phosphoprotein sequence, another matched a cDNA sequence, while the last
one was unique. These cDNAs were clearly induced by infection in THP-1 macrophages;
however, a pattern of expression of these clones did not emerge in human peripheral blood
macrophages. Further research must be performed before conclusions can be made regarding the
expression and function of these clones.
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Extent |
14240903 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-24
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0087975
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.