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Immunohistochemical analysis indicates that the anatomical location of B-cell non-Hodgkin's lymphoma is determined by differentially expressed chemokine receptors, sphingosine-1-phosphate receptors and integrins.

Middle S, Coupland SE, Taktak A, Kidgell V, Slupsky JR, Pettitt AR, Till KJ - Exp Hematol Oncol (2015)

Bottom Line: Finally, leukaemic lymphomas (6 FL, 5 MCL and 2 MZL) were characterised by aberrant expression of the egress receptor S1PR1 and low expression of molecules required for tissue entry/retention.In summary, our study strongly suggests that anatomical location in B-NHL is governed by the differential expression of specific adhesion/motility molecules.This novel observation has important implications for therapeutic strategies that aim to disrupt protective micro-environmental interactions.

View Article: PubMed Central - PubMed

Affiliation: Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Liverpool, England.

ABSTRACT

Background: The aim of this study was to elucidate the mechanisms responsible for the location of B-cell non-Hodgkin's lymphoma (B-NHL) at different anatomical sites. We speculated that the malignant B cells in these disorders have the potential for trafficking between blood and secondary lymphoid organs (SLO) or extranodal sites and that their preferential accumulation at different locations is governed by the expression of key molecules that regulate the trafficking of normal lymphocytes.

Methods: Biopsy or blood samples from 91 cases of B-NHL affecting SLO (n = 27), ocular adnexae (n = 51) or blood (n = 13) were analysed by immunohistochemistry or flow cytometry for the expression of the following molecules: CCR7, CCL21 and αL (required for the entry of normal lymphocytes into SLO); CXCR4, CXCL12 and α4 (required for entry into extranodal sites); CXCR5, CXCL13 and S1PR2 (required for tissue retention); S1PR1 and S1PR3 (required for egress into the blood). The expression of each of these molecules was then related to anatomical location and histological subtype.

Results: The expression of motility/adhesion molecules varied widely between individual patient samples and correlated much more strongly with anatomical location than with histological subtype. SLO lymphomas [comprising 10 follicular lymphoma (FL), 8 diffuse large B-cell lymphoma (DLBCL), 4 mantle-cell lymphoma (MCL) and 5 marginal-zone lymphoma (MZL)] were characterised by pronounced over-expression of S1PR2, suggesting that the malignant cells in these lymphomas are actively retained at the site of clonal expansion. In contrast, the malignant B cells in ocular adnexal lymphomas (10 FL, 9 DLBCL, 4 MCL and 28 MZL) expressed a profile of molecules suggesting a dynamic process of trafficking involving not only tissue retention but also egress via S1PR3 and homing back to extranodal sites via CXCR4/CXCL12 and α4. Finally, leukaemic lymphomas (6 FL, 5 MCL and 2 MZL) were characterised by aberrant expression of the egress receptor S1PR1 and low expression of molecules required for tissue entry/retention.

Conclusions: In summary, our study strongly suggests that anatomical location in B-NHL is governed by the differential expression of specific adhesion/motility molecules. This novel observation has important implications for therapeutic strategies that aim to disrupt protective micro-environmental interactions.

No MeSH data available.


Related in: MedlinePlus

Expression of molecules involved in egress from tissues. A. Box and whiskers plots show lymphomas analysed according to histology and A. Lymphomas analysed according by tissue of origin. B. Box and whiskers plots show lymphomas according to histology. Statistically significant differences in expression are shown.
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Fig6: Expression of molecules involved in egress from tissues. A. Box and whiskers plots show lymphomas analysed according to histology and A. Lymphomas analysed according by tissue of origin. B. Box and whiskers plots show lymphomas according to histology. Statistically significant differences in expression are shown.

Mentions: Finally, we analysed the egress receptors S1PR1 and S1PR3. Grouping lymphomas according to anatomical location (Figures 2 and 6A, Table 1A) revealed that S1PR1 was expressed at much higher levels in leukaemic lymphomas compared to OAL and lymphomas of the SLO. This result was unexpected given that S1PR1 is expressed at low levels in normal lymphocytes as a result of rapid internalisation of the receptor following binding to its ligand, which is present at high levels in the blood [28]. Technical problems with the antibody precluded flow cytometric analysis of S1PR3 in leukaemic lymphomas. However, S1PR3 was expressed at higher levels in OAL compared to lymphomas of the SLO. Comparison between histological subtype irrespective of anatomical location (Figure 6B; Table 1B) revealed mostly similar expression of S1PR1 and S1PR3 among the different lymphoma subtypes, although S1PR1 was expressed at low levels in DLBCL in keeping with its negative association with leukaemic lymphoma.Figure 6


Immunohistochemical analysis indicates that the anatomical location of B-cell non-Hodgkin's lymphoma is determined by differentially expressed chemokine receptors, sphingosine-1-phosphate receptors and integrins.

Middle S, Coupland SE, Taktak A, Kidgell V, Slupsky JR, Pettitt AR, Till KJ - Exp Hematol Oncol (2015)

Expression of molecules involved in egress from tissues. A. Box and whiskers plots show lymphomas analysed according to histology and A. Lymphomas analysed according by tissue of origin. B. Box and whiskers plots show lymphomas according to histology. Statistically significant differences in expression are shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4416323&req=5

Fig6: Expression of molecules involved in egress from tissues. A. Box and whiskers plots show lymphomas analysed according to histology and A. Lymphomas analysed according by tissue of origin. B. Box and whiskers plots show lymphomas according to histology. Statistically significant differences in expression are shown.
Mentions: Finally, we analysed the egress receptors S1PR1 and S1PR3. Grouping lymphomas according to anatomical location (Figures 2 and 6A, Table 1A) revealed that S1PR1 was expressed at much higher levels in leukaemic lymphomas compared to OAL and lymphomas of the SLO. This result was unexpected given that S1PR1 is expressed at low levels in normal lymphocytes as a result of rapid internalisation of the receptor following binding to its ligand, which is present at high levels in the blood [28]. Technical problems with the antibody precluded flow cytometric analysis of S1PR3 in leukaemic lymphomas. However, S1PR3 was expressed at higher levels in OAL compared to lymphomas of the SLO. Comparison between histological subtype irrespective of anatomical location (Figure 6B; Table 1B) revealed mostly similar expression of S1PR1 and S1PR3 among the different lymphoma subtypes, although S1PR1 was expressed at low levels in DLBCL in keeping with its negative association with leukaemic lymphoma.Figure 6

Bottom Line: Finally, leukaemic lymphomas (6 FL, 5 MCL and 2 MZL) were characterised by aberrant expression of the egress receptor S1PR1 and low expression of molecules required for tissue entry/retention.In summary, our study strongly suggests that anatomical location in B-NHL is governed by the differential expression of specific adhesion/motility molecules.This novel observation has important implications for therapeutic strategies that aim to disrupt protective micro-environmental interactions.

View Article: PubMed Central - PubMed

Affiliation: Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Liverpool, England.

ABSTRACT

Background: The aim of this study was to elucidate the mechanisms responsible for the location of B-cell non-Hodgkin's lymphoma (B-NHL) at different anatomical sites. We speculated that the malignant B cells in these disorders have the potential for trafficking between blood and secondary lymphoid organs (SLO) or extranodal sites and that their preferential accumulation at different locations is governed by the expression of key molecules that regulate the trafficking of normal lymphocytes.

Methods: Biopsy or blood samples from 91 cases of B-NHL affecting SLO (n = 27), ocular adnexae (n = 51) or blood (n = 13) were analysed by immunohistochemistry or flow cytometry for the expression of the following molecules: CCR7, CCL21 and αL (required for the entry of normal lymphocytes into SLO); CXCR4, CXCL12 and α4 (required for entry into extranodal sites); CXCR5, CXCL13 and S1PR2 (required for tissue retention); S1PR1 and S1PR3 (required for egress into the blood). The expression of each of these molecules was then related to anatomical location and histological subtype.

Results: The expression of motility/adhesion molecules varied widely between individual patient samples and correlated much more strongly with anatomical location than with histological subtype. SLO lymphomas [comprising 10 follicular lymphoma (FL), 8 diffuse large B-cell lymphoma (DLBCL), 4 mantle-cell lymphoma (MCL) and 5 marginal-zone lymphoma (MZL)] were characterised by pronounced over-expression of S1PR2, suggesting that the malignant cells in these lymphomas are actively retained at the site of clonal expansion. In contrast, the malignant B cells in ocular adnexal lymphomas (10 FL, 9 DLBCL, 4 MCL and 28 MZL) expressed a profile of molecules suggesting a dynamic process of trafficking involving not only tissue retention but also egress via S1PR3 and homing back to extranodal sites via CXCR4/CXCL12 and α4. Finally, leukaemic lymphomas (6 FL, 5 MCL and 2 MZL) were characterised by aberrant expression of the egress receptor S1PR1 and low expression of molecules required for tissue entry/retention.

Conclusions: In summary, our study strongly suggests that anatomical location in B-NHL is governed by the differential expression of specific adhesion/motility molecules. This novel observation has important implications for therapeutic strategies that aim to disrupt protective micro-environmental interactions.

No MeSH data available.


Related in: MedlinePlus