CDK9/CYCLIN T1 expression during normal lymphoid differentiation and malignant transformation

CDK9 is a member of the CDC2‐like family of kinases. Its cyclin partners are members of the CYCLIN T family (T1, T2a, and T2b) and CYCLIN K. The CDK9/CYCLIN T1 complex is very important in the differentiation programme of several cell types, controlling specific differentiation pathways. Limited dat...

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Veröffentlicht in:The Journal of pathology 2004-08, Vol.203 (4), p.946-952
Hauptverfasser: Bellan, Cristiana, De Falco, Giulia, Lazzi, Stefano, Micheli, Pietro, Vicidomini, Sonia, Schürfeld, Karin, Amato, Teresa, Palumbo, Annalisa, Bagella, Luigi, Sabattini, Elena, Bartolommei, Sabrina, Hummel, Michael, Pileri, Stefano, Tosi, Piero, Leoncini, Lorenzo, Giordano, Antonio
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container_issue 4
container_start_page 946
container_title The Journal of pathology
container_volume 203
creator Bellan, Cristiana
De Falco, Giulia
Lazzi, Stefano
Micheli, Pietro
Vicidomini, Sonia
Schürfeld, Karin
Amato, Teresa
Palumbo, Annalisa
Bagella, Luigi
Sabattini, Elena
Bartolommei, Sabrina
Hummel, Michael
Pileri, Stefano
Tosi, Piero
Leoncini, Lorenzo
Giordano, Antonio
description CDK9 is a member of the CDC2‐like family of kinases. Its cyclin partners are members of the CYCLIN T family (T1, T2a, and T2b) and CYCLIN K. The CDK9/CYCLIN T1 complex is very important in the differentiation programme of several cell types, controlling specific differentiation pathways. Limited data are available regarding the expression of CDK9/CYCLIN T1 in haematopoietic and lymphoid tissues. The aim of this study was to analyse the expression of the CDK9/CYCLIN T1 complex in lymphoid tissue, in order to assess its role in B‐ and T‐cell differentiation and lymphomagenesis. CDK9/CYCLIN T1 expression was found by immunohistochemistry in precursor B and T cells. In peripheral lymphoid tissues, germinal centre cells and scattered B‐ and T‐cell blasts in interfollicular areas expressed CDK9/CYCLIN T1, while mantle cells, plasma cells, and small resting T‐lymphocytes displayed no expression of either molecule. CDK9/CYCLIN T1 expression therefore appears to be related to particular stages of lymphoid differentiation/activation. CDK9 and CYCLIN T1 were highly expressed in lymphomas derived from precursor B and T cells, from germinal centre cells, such as follicular lymphomas, and from activated T cells (ie anaplastic large cell lymphomas). Hodgkin and Reed–Sternberg cells of classical Hodgkin's lymphoma also showed strong nuclear staining. Diffuse large B‐cell, Burkitt's lymphomas, and peripheral T‐cell lymphomas, among T‐cell lymphoproliferative disorders, showed a wide range of values. No expression of CDK9 or CYCLIN T1 was detected in mantle cell and marginal zone lymphomas. However, at the mRNA level, an imbalance in the CDK9/CYCLIN T1 ratio was found in follicular lymphoma and diffuse large B‐cell lymphomas with germinal centre phenotype, and in the cell lines of classical Hodgkin's lymphomas, Burkitt's lymphomas, and anaplastic large cell lymphoma, in comparison with reactive lymph nodes. These results suggest that the CDK9/CYCLIN T1 complex may affect the activation and differentiation programme of lymphoid cells. The molecular mechanism through which the CDK9/CYCLIN T1 complex is altered in malignant transformation needs to be elucidated. Copyright © 2004 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Its cyclin partners are members of the CYCLIN T family (T1, T2a, and T2b) and CYCLIN K. The CDK9/CYCLIN T1 complex is very important in the differentiation programme of several cell types, controlling specific differentiation pathways. Limited data are available regarding the expression of CDK9/CYCLIN T1 in haematopoietic and lymphoid tissues. The aim of this study was to analyse the expression of the CDK9/CYCLIN T1 complex in lymphoid tissue, in order to assess its role in B‐ and T‐cell differentiation and lymphomagenesis. CDK9/CYCLIN T1 expression was found by immunohistochemistry in precursor B and T cells. In peripheral lymphoid tissues, germinal centre cells and scattered B‐ and T‐cell blasts in interfollicular areas expressed CDK9/CYCLIN T1, while mantle cells, plasma cells, and small resting T‐lymphocytes displayed no expression of either molecule. CDK9/CYCLIN T1 expression therefore appears to be related to particular stages of lymphoid differentiation/activation. CDK9 and CYCLIN T1 were highly expressed in lymphomas derived from precursor B and T cells, from germinal centre cells, such as follicular lymphomas, and from activated T cells (ie anaplastic large cell lymphomas). Hodgkin and Reed–Sternberg cells of classical Hodgkin's lymphoma also showed strong nuclear staining. Diffuse large B‐cell, Burkitt's lymphomas, and peripheral T‐cell lymphomas, among T‐cell lymphoproliferative disorders, showed a wide range of values. No expression of CDK9 or CYCLIN T1 was detected in mantle cell and marginal zone lymphomas. However, at the mRNA level, an imbalance in the CDK9/CYCLIN T1 ratio was found in follicular lymphoma and diffuse large B‐cell lymphomas with germinal centre phenotype, and in the cell lines of classical Hodgkin's lymphomas, Burkitt's lymphomas, and anaplastic large cell lymphoma, in comparison with reactive lymph nodes. These results suggest that the CDK9/CYCLIN T1 complex may affect the activation and differentiation programme of lymphoid cells. The molecular mechanism through which the CDK9/CYCLIN T1 complex is altered in malignant transformation needs to be elucidated. Copyright © 2004 Pathological Society of Great Britain and Ireland. 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Myelofibrosis ; lymphadenitis ; lymphocyte ; lymphoma ; Lymphoma, B-Cell - metabolism ; Lymphoma, B-Cell - pathology ; Lymphoma, T-Cell - metabolism ; Lymphoma, T-Cell - pathology ; Male ; Medical sciences ; Neoplasm Proteins - genetics ; Neoplasm Proteins - metabolism ; Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques ; Reverse Transcriptase Polymerase Chain Reaction ; RNA, Messenger - genetics</subject><ispartof>The Journal of pathology, 2004-08, Vol.203 (4), p.946-952</ispartof><rights>Copyright © 2004 Pathological Society of Great Britain and Ireland. 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Pathol</addtitle><description>CDK9 is a member of the CDC2‐like family of kinases. Its cyclin partners are members of the CYCLIN T family (T1, T2a, and T2b) and CYCLIN K. The CDK9/CYCLIN T1 complex is very important in the differentiation programme of several cell types, controlling specific differentiation pathways. Limited data are available regarding the expression of CDK9/CYCLIN T1 in haematopoietic and lymphoid tissues. The aim of this study was to analyse the expression of the CDK9/CYCLIN T1 complex in lymphoid tissue, in order to assess its role in B‐ and T‐cell differentiation and lymphomagenesis. CDK9/CYCLIN T1 expression was found by immunohistochemistry in precursor B and T cells. In peripheral lymphoid tissues, germinal centre cells and scattered B‐ and T‐cell blasts in interfollicular areas expressed CDK9/CYCLIN T1, while mantle cells, plasma cells, and small resting T‐lymphocytes displayed no expression of either molecule. CDK9/CYCLIN T1 expression therefore appears to be related to particular stages of lymphoid differentiation/activation. CDK9 and CYCLIN T1 were highly expressed in lymphomas derived from precursor B and T cells, from germinal centre cells, such as follicular lymphomas, and from activated T cells (ie anaplastic large cell lymphomas). Hodgkin and Reed–Sternberg cells of classical Hodgkin's lymphoma also showed strong nuclear staining. Diffuse large B‐cell, Burkitt's lymphomas, and peripheral T‐cell lymphomas, among T‐cell lymphoproliferative disorders, showed a wide range of values. No expression of CDK9 or CYCLIN T1 was detected in mantle cell and marginal zone lymphomas. 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Published by John Wiley &amp; Sons, Ltd.</description><subject>Biological and medical sciences</subject><subject>Blotting, Western</subject><subject>CDK9</subject><subject>Cell Differentiation</subject><subject>Cell Transformation, Neoplastic - metabolism</subject><subject>Cell Transformation, Neoplastic - pathology</subject><subject>CYCLIN T</subject><subject>Cyclin-Dependent Kinase 9 - genetics</subject><subject>Cyclin-Dependent Kinase 9 - metabolism</subject><subject>Cyclins - genetics</subject><subject>Cyclins - metabolism</subject><subject>differentiation</subject><subject>Female</subject><subject>Gene Expression</subject><subject>Hematologic and hematopoietic diseases</subject><subject>Humans</subject><subject>Immunoenzyme Techniques</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis</subject><subject>lymphadenitis</subject><subject>lymphocyte</subject><subject>lymphoma</subject><subject>Lymphoma, B-Cell - metabolism</subject><subject>Lymphoma, B-Cell - pathology</subject><subject>Lymphoma, T-Cell - metabolism</subject><subject>Lymphoma, T-Cell - pathology</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Neoplasm Proteins - genetics</subject><subject>Neoplasm Proteins - metabolism</subject><subject>Pathology. Cytology. Biochemistry. Spectrometry. 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Malignant lymphomas. Malignant reticulosis. Myelofibrosis</topic><topic>lymphadenitis</topic><topic>lymphocyte</topic><topic>lymphoma</topic><topic>Lymphoma, B-Cell - metabolism</topic><topic>Lymphoma, B-Cell - pathology</topic><topic>Lymphoma, T-Cell - metabolism</topic><topic>Lymphoma, T-Cell - pathology</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Neoplasm Proteins - genetics</topic><topic>Neoplasm Proteins - metabolism</topic><topic>Pathology. Cytology. Biochemistry. Spectrometry. 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In peripheral lymphoid tissues, germinal centre cells and scattered B‐ and T‐cell blasts in interfollicular areas expressed CDK9/CYCLIN T1, while mantle cells, plasma cells, and small resting T‐lymphocytes displayed no expression of either molecule. CDK9/CYCLIN T1 expression therefore appears to be related to particular stages of lymphoid differentiation/activation. CDK9 and CYCLIN T1 were highly expressed in lymphomas derived from precursor B and T cells, from germinal centre cells, such as follicular lymphomas, and from activated T cells (ie anaplastic large cell lymphomas). Hodgkin and Reed–Sternberg cells of classical Hodgkin's lymphoma also showed strong nuclear staining. Diffuse large B‐cell, Burkitt's lymphomas, and peripheral T‐cell lymphomas, among T‐cell lymphoproliferative disorders, showed a wide range of values. No expression of CDK9 or CYCLIN T1 was detected in mantle cell and marginal zone lymphomas. However, at the mRNA level, an imbalance in the CDK9/CYCLIN T1 ratio was found in follicular lymphoma and diffuse large B‐cell lymphomas with germinal centre phenotype, and in the cell lines of classical Hodgkin's lymphomas, Burkitt's lymphomas, and anaplastic large cell lymphoma, in comparison with reactive lymph nodes. These results suggest that the CDK9/CYCLIN T1 complex may affect the activation and differentiation programme of lymphoid cells. The molecular mechanism through which the CDK9/CYCLIN T1 complex is altered in malignant transformation needs to be elucidated. Copyright © 2004 Pathological Society of Great Britain and Ireland. Published by John Wiley &amp; Sons, Ltd.</abstract><cop>Chichester, UK</cop><pub>John Wiley &amp; Sons, Ltd</pub><pmid>15258998</pmid><doi>10.1002/path.1588</doi><tpages>7</tpages></addata></record>
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subjects Biological and medical sciences
Blotting, Western
CDK9
Cell Differentiation
Cell Transformation, Neoplastic - metabolism
Cell Transformation, Neoplastic - pathology
CYCLIN T
Cyclin-Dependent Kinase 9 - genetics
Cyclin-Dependent Kinase 9 - metabolism
Cyclins - genetics
Cyclins - metabolism
differentiation
Female
Gene Expression
Hematologic and hematopoietic diseases
Humans
Immunoenzyme Techniques
Investigative techniques, diagnostic techniques (general aspects)
Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis
lymphadenitis
lymphocyte
lymphoma
Lymphoma, B-Cell - metabolism
Lymphoma, B-Cell - pathology
Lymphoma, T-Cell - metabolism
Lymphoma, T-Cell - pathology
Male
Medical sciences
Neoplasm Proteins - genetics
Neoplasm Proteins - metabolism
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - genetics
title CDK9/CYCLIN T1 expression during normal lymphoid differentiation and malignant transformation
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