Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells

Varadarajan Parthasarathy, Francine Martin, Adrian Higginbottom, Helen Murray, Gregory William Moseley, Robert C Read, Gorakh Mal, Rachel Hulme, Peter N Monk, Lynda J Partridge

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Members of the tetraspanin superfamily of proteins are implicated in a variety of complex cell processes including cell fusion. However, the contribution of individual tetraspanins to these processes has proved difficult to define. Here we report the use of recombinant extracellular regions of tetraspanins to investigate the role of specific members of this family in the fusion of monocytes to form multinucleated giant cells (MGC). In contrast to their positive requirement in sperm-egg fusion, previous studies using antibodies and knockout mice have indicated a negative regulatory role for tetraspanins CD9 and CD81 in this process. In an in vitro model of fusion using human monocytes, we have confirmed observations that antibodies to CD9 and CD81 enhance MGC formation; however, in contrast to previous investigations, we found that all members of a panel of antibodies to CD63 inhibited fusion. Moreover, recombinant proteins corresponding to the large extracellular domains (EC2s) of CD63 and CD9 inhibited MGC formation, whereas the EC2s of CD81 and CD151 had no effect. The potent inhibition of fusion and binding of labelled CD63 EC2 to monocytes under fusogenic conditions suggest a direct interaction with a membrane component required for fusion. Our findings indicate that the tetraspanins CD9, CD63 and CD81 are all involved in MGC formation, but play distinct roles.
Original languageEnglish
Pages (from-to)237 - 248
Number of pages12
JournalImmunology
Volume127
Issue number2
DOIs
Publication statusPublished - 2009
Externally publishedYes

Cite this

Parthasarathy, V., Martin, F., Higginbottom, A., Murray, H., Moseley, G. W., Read, R. C., ... Partridge, L. J. (2009). Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells. Immunology, 127(2), 237 - 248. https://doi.org/10.1111/j.1365-2567.2008.02945.x
Parthasarathy, Varadarajan ; Martin, Francine ; Higginbottom, Adrian ; Murray, Helen ; Moseley, Gregory William ; Read, Robert C ; Mal, Gorakh ; Hulme, Rachel ; Monk, Peter N ; Partridge, Lynda J. / Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells. In: Immunology. 2009 ; Vol. 127, No. 2. pp. 237 - 248.
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abstract = "Members of the tetraspanin superfamily of proteins are implicated in a variety of complex cell processes including cell fusion. However, the contribution of individual tetraspanins to these processes has proved difficult to define. Here we report the use of recombinant extracellular regions of tetraspanins to investigate the role of specific members of this family in the fusion of monocytes to form multinucleated giant cells (MGC). In contrast to their positive requirement in sperm-egg fusion, previous studies using antibodies and knockout mice have indicated a negative regulatory role for tetraspanins CD9 and CD81 in this process. In an in vitro model of fusion using human monocytes, we have confirmed observations that antibodies to CD9 and CD81 enhance MGC formation; however, in contrast to previous investigations, we found that all members of a panel of antibodies to CD63 inhibited fusion. Moreover, recombinant proteins corresponding to the large extracellular domains (EC2s) of CD63 and CD9 inhibited MGC formation, whereas the EC2s of CD81 and CD151 had no effect. The potent inhibition of fusion and binding of labelled CD63 EC2 to monocytes under fusogenic conditions suggest a direct interaction with a membrane component required for fusion. Our findings indicate that the tetraspanins CD9, CD63 and CD81 are all involved in MGC formation, but play distinct roles.",
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Parthasarathy, V, Martin, F, Higginbottom, A, Murray, H, Moseley, GW, Read, RC, Mal, G, Hulme, R, Monk, PN & Partridge, LJ 2009, 'Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells' Immunology, vol. 127, no. 2, pp. 237 - 248. https://doi.org/10.1111/j.1365-2567.2008.02945.x

Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells. / Parthasarathy, Varadarajan; Martin, Francine; Higginbottom, Adrian; Murray, Helen; Moseley, Gregory William; Read, Robert C; Mal, Gorakh; Hulme, Rachel; Monk, Peter N; Partridge, Lynda J.

In: Immunology, Vol. 127, No. 2, 2009, p. 237 - 248.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Distinct roles for tetraspanins CD9, CD63 and CD81 in the formation of multinucleated giant cells

AU - Parthasarathy, Varadarajan

AU - Martin, Francine

AU - Higginbottom, Adrian

AU - Murray, Helen

AU - Moseley, Gregory William

AU - Read, Robert C

AU - Mal, Gorakh

AU - Hulme, Rachel

AU - Monk, Peter N

AU - Partridge, Lynda J

PY - 2009

Y1 - 2009

N2 - Members of the tetraspanin superfamily of proteins are implicated in a variety of complex cell processes including cell fusion. However, the contribution of individual tetraspanins to these processes has proved difficult to define. Here we report the use of recombinant extracellular regions of tetraspanins to investigate the role of specific members of this family in the fusion of monocytes to form multinucleated giant cells (MGC). In contrast to their positive requirement in sperm-egg fusion, previous studies using antibodies and knockout mice have indicated a negative regulatory role for tetraspanins CD9 and CD81 in this process. In an in vitro model of fusion using human monocytes, we have confirmed observations that antibodies to CD9 and CD81 enhance MGC formation; however, in contrast to previous investigations, we found that all members of a panel of antibodies to CD63 inhibited fusion. Moreover, recombinant proteins corresponding to the large extracellular domains (EC2s) of CD63 and CD9 inhibited MGC formation, whereas the EC2s of CD81 and CD151 had no effect. The potent inhibition of fusion and binding of labelled CD63 EC2 to monocytes under fusogenic conditions suggest a direct interaction with a membrane component required for fusion. Our findings indicate that the tetraspanins CD9, CD63 and CD81 are all involved in MGC formation, but play distinct roles.

AB - Members of the tetraspanin superfamily of proteins are implicated in a variety of complex cell processes including cell fusion. However, the contribution of individual tetraspanins to these processes has proved difficult to define. Here we report the use of recombinant extracellular regions of tetraspanins to investigate the role of specific members of this family in the fusion of monocytes to form multinucleated giant cells (MGC). In contrast to their positive requirement in sperm-egg fusion, previous studies using antibodies and knockout mice have indicated a negative regulatory role for tetraspanins CD9 and CD81 in this process. In an in vitro model of fusion using human monocytes, we have confirmed observations that antibodies to CD9 and CD81 enhance MGC formation; however, in contrast to previous investigations, we found that all members of a panel of antibodies to CD63 inhibited fusion. Moreover, recombinant proteins corresponding to the large extracellular domains (EC2s) of CD63 and CD9 inhibited MGC formation, whereas the EC2s of CD81 and CD151 had no effect. The potent inhibition of fusion and binding of labelled CD63 EC2 to monocytes under fusogenic conditions suggest a direct interaction with a membrane component required for fusion. Our findings indicate that the tetraspanins CD9, CD63 and CD81 are all involved in MGC formation, but play distinct roles.

UR - http://www.ncbi.nlm.nih.gov/pubmed/19489128

U2 - 10.1111/j.1365-2567.2008.02945.x

DO - 10.1111/j.1365-2567.2008.02945.x

M3 - Article

VL - 127

SP - 237

EP - 248

JO - Immunology

JF - Immunology

SN - 0019-2805

IS - 2

ER -