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T cell receptor (TCR) Vbeta gene usage in bronchoalveolar lavage and peripheral blood T cells from asthmatic and normal subjects

T cell receptor (TCR) Vbeta gene usage in bronchoalveolar lavage and peripheral blood T cells from asthmatic and normal subjects
T cell receptor (TCR) Vbeta gene usage in bronchoalveolar lavage and peripheral blood T cells from asthmatic and normal subjects
T cells are thought to play an important regulatory role in asthma, but little is known about the T cell repertoire of the human lung or whether asthma is associated with any specific repertoire changes. Flow cytometry and MoAbs to TCR VB (TCRBV) families were used to quantify bronchoalveolar lavage (BAL) and blood T cells from normal and atopic individuals. Clonality was then assessed by polymerase chain reaction (PCR) amplification of cDNA and gene scanning using consensus and family-specific TCRBV primers and confirmed by sequence analysis. In addition, blood and BAL T cell populations were studied pre- and post-allergen challenge in four patients with allergic asthma. The majority of TCRBV families detected in blood by MoAb staining were also represented in BAL. While differences between BAL and blood populations were evident in each individual studied, these differences were not consistent between individuals or between CD4+ and CD8+ T cell subpopulations. These results are in broad agreement with other published studies, but in contrast to previous work we found a consistent difference between TCRBV7 family usage in blood and BAL in all individuals studied, and a consistently increased proportion of CD4+ BAL T cells bearing BV5S2/3 in asthmatics only. After allergen challenge, the pattern of TCRBV gene usage was largely unchanged as judged by flow cytometry. Gene scanning of PCR products generated from consensus VB primers revealed polyclonal lymphocyte populations in blood and BAL from all seven atopic individuals: in one normal tested polyclonal populations were found in blood and oligoclonal populations in BAL. Selected families amplified with family-specific primers BV5S2/3, BV6 and BV7 (chosen because of their predominance in BAL compared with blood) were more variable and revealed predominant polyclonal populations in blood and polyclonal or oligoclonal populations in BAL. In one asthmatic patient a clonal BV5S2 family was found in BAL. Following allergen challenge there were no significant changes in polyclonality/oligoclonality/clonality in three cases, but in one case a clonal BV5S2 population was found after challenge, that had not been evident beforehand. The lung T cell repertoire is thus broadly representative of blood T cells, but shows population differences that may result from response to persistent exposure to airborne antigens common to normal and atopic individuals. Oligoclonal TCRBV family expansion appears to be primarily lung-specific but independent of atopic asthma, although our challenge data in one case support the concept that clonal populations may follow local allergen challenge. These data are consistent with selection and amplification of specific T cell families in the lung in response to local antigenic exposure
0009-9104
363-374
Hodges, E.
85c114a2-4533-48d7-8a6c-7b82a4138251
Dasmahapatra, J.
a694b0e9-f1e8-479d-96db-004cd2da4ad5
Smith, J.L.
f9291742-f9d3-4e27-bfe6-94d41e816fa8
Quin, C.T.
0c2cfb2f-d27a-44b2-a6a5-66efab7081c3
Lanham, S.A.
28fdbbef-e3b6-4fdf-bd0f-4968eeb614d6
Krishna, M.T.
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Holgate, Stephen T.
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Frew, A.J.
c00e9630-a5f0-44b3-add0-44b68836bbcb
Hodges, E.
85c114a2-4533-48d7-8a6c-7b82a4138251
Dasmahapatra, J.
a694b0e9-f1e8-479d-96db-004cd2da4ad5
Smith, J.L.
f9291742-f9d3-4e27-bfe6-94d41e816fa8
Quin, C.T.
0c2cfb2f-d27a-44b2-a6a5-66efab7081c3
Lanham, S.A.
28fdbbef-e3b6-4fdf-bd0f-4968eeb614d6
Krishna, M.T.
9bd28040-1482-4a78-8e37-7f22cdfe4220
Holgate, Stephen T.
2e7c17a9-6796-436e-8772-1fe6d2ac5edc
Frew, A.J.
c00e9630-a5f0-44b3-add0-44b68836bbcb

Hodges, E., Dasmahapatra, J., Smith, J.L., Quin, C.T., Lanham, S.A., Krishna, M.T., Holgate, Stephen T. and Frew, A.J. (1998) T cell receptor (TCR) Vbeta gene usage in bronchoalveolar lavage and peripheral blood T cells from asthmatic and normal subjects Clinical and Experimental Immunology, 112, (3), pp. 363-374. (doi:10.1046/j.1365-2249.1998.00611.x). (PMID:9649203).

Record type: Article

Abstract

T cells are thought to play an important regulatory role in asthma, but little is known about the T cell repertoire of the human lung or whether asthma is associated with any specific repertoire changes. Flow cytometry and MoAbs to TCR VB (TCRBV) families were used to quantify bronchoalveolar lavage (BAL) and blood T cells from normal and atopic individuals. Clonality was then assessed by polymerase chain reaction (PCR) amplification of cDNA and gene scanning using consensus and family-specific TCRBV primers and confirmed by sequence analysis. In addition, blood and BAL T cell populations were studied pre- and post-allergen challenge in four patients with allergic asthma. The majority of TCRBV families detected in blood by MoAb staining were also represented in BAL. While differences between BAL and blood populations were evident in each individual studied, these differences were not consistent between individuals or between CD4+ and CD8+ T cell subpopulations. These results are in broad agreement with other published studies, but in contrast to previous work we found a consistent difference between TCRBV7 family usage in blood and BAL in all individuals studied, and a consistently increased proportion of CD4+ BAL T cells bearing BV5S2/3 in asthmatics only. After allergen challenge, the pattern of TCRBV gene usage was largely unchanged as judged by flow cytometry. Gene scanning of PCR products generated from consensus VB primers revealed polyclonal lymphocyte populations in blood and BAL from all seven atopic individuals: in one normal tested polyclonal populations were found in blood and oligoclonal populations in BAL. Selected families amplified with family-specific primers BV5S2/3, BV6 and BV7 (chosen because of their predominance in BAL compared with blood) were more variable and revealed predominant polyclonal populations in blood and polyclonal or oligoclonal populations in BAL. In one asthmatic patient a clonal BV5S2 family was found in BAL. Following allergen challenge there were no significant changes in polyclonality/oligoclonality/clonality in three cases, but in one case a clonal BV5S2 population was found after challenge, that had not been evident beforehand. The lung T cell repertoire is thus broadly representative of blood T cells, but shows population differences that may result from response to persistent exposure to airborne antigens common to normal and atopic individuals. Oligoclonal TCRBV family expansion appears to be primarily lung-specific but independent of atopic asthma, although our challenge data in one case support the concept that clonal populations may follow local allergen challenge. These data are consistent with selection and amplification of specific T cell families in the lung in response to local antigenic exposure

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Published date: June 1998
Organisations: Clinical & Experimental Sciences

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Local EPrints ID: 348223
URI: http://eprints.soton.ac.uk/id/eprint/348223
ISSN: 0009-9104
PURE UUID: 4206905c-3967-4b95-9099-4ba6565339f8
ORCID for S.A. Lanham: ORCID iD orcid.org/0000-0002-4516-264X

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Date deposited: 01 Mar 2013 14:58
Last modified: 18 Jul 2017 04:53

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Contributors

Author: E. Hodges
Author: J. Dasmahapatra
Author: J.L. Smith
Author: C.T. Quin
Author: S.A. Lanham ORCID iD
Author: M.T. Krishna
Author: A.J. Frew

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