Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice
Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E.
American Society of Hematology (ASH)
Published 2018
American Society of Hematology (ASH)
Published 2018
| Publication Date: |
2018-09-07
|
|---|---|
| Publisher: |
American Society of Hematology (ASH)
|
| Print ISSN: |
0006-4971
|
| Electronic ISSN: |
1528-0020
|
| Topics: |
Biology
Medicine
|
| Keywords: |
Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis
|
| Published by: |
| _version_ | 1836399044533944320 |
|---|---|
| autor | Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. |
| beschreibung | We hypothesized that megakaryocyte (MK) phosphoinositide signaling mediated by phosphatidylinositol transfer proteins (PITPs) contributes to hematopoietic stem cell (HSC) and hematopoietic progenitor cell (HPC) regulation. Conditional knockout mice lacking PITPs specifically in MKs and platelets (pitpα –/– and pitpα –/– /β –/– ) bone marrow (BM) manifested decreased numbers of HSCs, MK-erythrocyte progenitors, and cycling HPCs. Further, pitpα –/– /β –/– BM had significantly reduced engrafting capability in competitive transplantation and limiting dilution analysis. Conditioned media (CM) from cultured pitpα –/– and pitpα –/– /β –/– BM MKs contained higher levels of transforming growth factor β1 (TGF-β1) and interleukin-4 (IL-4), among other myelosuppressive cytokines, than wild-type BM MKs. Correspondingly, BM flush fluid from pitpα –/– and pitpα –/– /β –/– mice had higher concentrations of TGF-β1. CM from pitpα –/– and pitpα –/– /β –/– MKs significantly suppressed HPC colony formation, which was completely extinguished in vitro by neutralizing anti–TGF-β antibody, and treatment of pitpα –/– /β –/– mice in vivo with anti–TGF-β antibodies completely reverted their defects in BM HSC and HPC numbers. TGF-β and IL-4 synergized to inhibit HPC colony formation in vitro. Electron microscopy analysis of pitpα –/– /β –/– MKs revealed ultrastructural defects with depleted α-granules and large, misshaped multivesicular bodies. Von Willebrand factor and thrombospondin-1, like TGF-β, are stored in MK α-granules and were also elevated in CM of cultured pitpα –/– /β –/– MKs. Altogether, these data show that ablating PITPs in MKs indirectly dysregulates hematopoiesis in the BM by disrupting α-granule physiology and secretion of TGF-β1. |
| citation_standardnr | 6329060 |
| datenlieferant | ipn_articles |
| feed_id | 310 |
| feed_publisher | American Society of Hematology (ASH) |
| feed_publisher_url | http://www.hematology.org/ |
| insertion_date | 2018-09-07 |
| journaleissn | 1528-0020 |
| journalissn | 0006-4971 |
| publikationsjahr_anzeige | 2018 |
| publikationsjahr_facette | 2018 |
| publikationsjahr_intervall | 7984:2015-2019 |
| publikationsjahr_sort | 2018 |
| publisher | American Society of Hematology (ASH) |
| quelle | Blood |
| relation | http://www.bloodjournal.org/cgi/content/short/132/10/1027?rss=1 |
| schlagwort | Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis |
| search_space | articles |
| shingle_author_1 | Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. |
| shingle_author_2 | Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. |
| shingle_author_3 | Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. |
| shingle_author_4 | Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. |
| shingle_catch_all_1 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis We hypothesized that megakaryocyte (MK) phosphoinositide signaling mediated by phosphatidylinositol transfer proteins (PITPs) contributes to hematopoietic stem cell (HSC) and hematopoietic progenitor cell (HPC) regulation. Conditional knockout mice lacking PITPs specifically in MKs and platelets (pitpα –/– and pitpα –/– /β –/– ) bone marrow (BM) manifested decreased numbers of HSCs, MK-erythrocyte progenitors, and cycling HPCs. Further, pitpα –/– /β –/– BM had significantly reduced engrafting capability in competitive transplantation and limiting dilution analysis. Conditioned media (CM) from cultured pitpα –/– and pitpα –/– /β –/– BM MKs contained higher levels of transforming growth factor β1 (TGF-β1) and interleukin-4 (IL-4), among other myelosuppressive cytokines, than wild-type BM MKs. Correspondingly, BM flush fluid from pitpα –/– and pitpα –/– /β –/– mice had higher concentrations of TGF-β1. CM from pitpα –/– and pitpα –/– /β –/– MKs significantly suppressed HPC colony formation, which was completely extinguished in vitro by neutralizing anti–TGF-β antibody, and treatment of pitpα –/– /β –/– mice in vivo with anti–TGF-β antibodies completely reverted their defects in BM HSC and HPC numbers. TGF-β and IL-4 synergized to inhibit HPC colony formation in vitro. Electron microscopy analysis of pitpα –/– /β –/– MKs revealed ultrastructural defects with depleted α-granules and large, misshaped multivesicular bodies. Von Willebrand factor and thrombospondin-1, like TGF-β, are stored in MK α-granules and were also elevated in CM of cultured pitpα –/– /β –/– MKs. Altogether, these data show that ablating PITPs in MKs indirectly dysregulates hematopoiesis in the BM by disrupting α-granule physiology and secretion of TGF-β1. Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. American Society of Hematology (ASH) 0006-4971 00064971 1528-0020 15280020 |
| shingle_catch_all_2 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis We hypothesized that megakaryocyte (MK) phosphoinositide signaling mediated by phosphatidylinositol transfer proteins (PITPs) contributes to hematopoietic stem cell (HSC) and hematopoietic progenitor cell (HPC) regulation. Conditional knockout mice lacking PITPs specifically in MKs and platelets (pitpα –/– and pitpα –/– /β –/– ) bone marrow (BM) manifested decreased numbers of HSCs, MK-erythrocyte progenitors, and cycling HPCs. Further, pitpα –/– /β –/– BM had significantly reduced engrafting capability in competitive transplantation and limiting dilution analysis. Conditioned media (CM) from cultured pitpα –/– and pitpα –/– /β –/– BM MKs contained higher levels of transforming growth factor β1 (TGF-β1) and interleukin-4 (IL-4), among other myelosuppressive cytokines, than wild-type BM MKs. Correspondingly, BM flush fluid from pitpα –/– and pitpα –/– /β –/– mice had higher concentrations of TGF-β1. CM from pitpα –/– and pitpα –/– /β –/– MKs significantly suppressed HPC colony formation, which was completely extinguished in vitro by neutralizing anti–TGF-β antibody, and treatment of pitpα –/– /β –/– mice in vivo with anti–TGF-β antibodies completely reverted their defects in BM HSC and HPC numbers. TGF-β and IL-4 synergized to inhibit HPC colony formation in vitro. Electron microscopy analysis of pitpα –/– /β –/– MKs revealed ultrastructural defects with depleted α-granules and large, misshaped multivesicular bodies. Von Willebrand factor and thrombospondin-1, like TGF-β, are stored in MK α-granules and were also elevated in CM of cultured pitpα –/– /β –/– MKs. Altogether, these data show that ablating PITPs in MKs indirectly dysregulates hematopoiesis in the BM by disrupting α-granule physiology and secretion of TGF-β1. Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. American Society of Hematology (ASH) 0006-4971 00064971 1528-0020 15280020 |
| shingle_catch_all_3 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis We hypothesized that megakaryocyte (MK) phosphoinositide signaling mediated by phosphatidylinositol transfer proteins (PITPs) contributes to hematopoietic stem cell (HSC) and hematopoietic progenitor cell (HPC) regulation. Conditional knockout mice lacking PITPs specifically in MKs and platelets (pitpα –/– and pitpα –/– /β –/– ) bone marrow (BM) manifested decreased numbers of HSCs, MK-erythrocyte progenitors, and cycling HPCs. Further, pitpα –/– /β –/– BM had significantly reduced engrafting capability in competitive transplantation and limiting dilution analysis. Conditioned media (CM) from cultured pitpα –/– and pitpα –/– /β –/– BM MKs contained higher levels of transforming growth factor β1 (TGF-β1) and interleukin-4 (IL-4), among other myelosuppressive cytokines, than wild-type BM MKs. Correspondingly, BM flush fluid from pitpα –/– and pitpα –/– /β –/– mice had higher concentrations of TGF-β1. CM from pitpα –/– and pitpα –/– /β –/– MKs significantly suppressed HPC colony formation, which was completely extinguished in vitro by neutralizing anti–TGF-β antibody, and treatment of pitpα –/– /β –/– mice in vivo with anti–TGF-β antibodies completely reverted their defects in BM HSC and HPC numbers. TGF-β and IL-4 synergized to inhibit HPC colony formation in vitro. Electron microscopy analysis of pitpα –/– /β –/– MKs revealed ultrastructural defects with depleted α-granules and large, misshaped multivesicular bodies. Von Willebrand factor and thrombospondin-1, like TGF-β, are stored in MK α-granules and were also elevated in CM of cultured pitpα –/– /β –/– MKs. Altogether, these data show that ablating PITPs in MKs indirectly dysregulates hematopoiesis in the BM by disrupting α-granule physiology and secretion of TGF-β1. Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. American Society of Hematology (ASH) 0006-4971 00064971 1528-0020 15280020 |
| shingle_catch_all_4 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice Hematopoiesis and Stem Cells, Platelets and Thrombopoiesis We hypothesized that megakaryocyte (MK) phosphoinositide signaling mediated by phosphatidylinositol transfer proteins (PITPs) contributes to hematopoietic stem cell (HSC) and hematopoietic progenitor cell (HPC) regulation. Conditional knockout mice lacking PITPs specifically in MKs and platelets (pitpα –/– and pitpα –/– /β –/– ) bone marrow (BM) manifested decreased numbers of HSCs, MK-erythrocyte progenitors, and cycling HPCs. Further, pitpα –/– /β –/– BM had significantly reduced engrafting capability in competitive transplantation and limiting dilution analysis. Conditioned media (CM) from cultured pitpα –/– and pitpα –/– /β –/– BM MKs contained higher levels of transforming growth factor β1 (TGF-β1) and interleukin-4 (IL-4), among other myelosuppressive cytokines, than wild-type BM MKs. Correspondingly, BM flush fluid from pitpα –/– and pitpα –/– /β –/– mice had higher concentrations of TGF-β1. CM from pitpα –/– and pitpα –/– /β –/– MKs significantly suppressed HPC colony formation, which was completely extinguished in vitro by neutralizing anti–TGF-β antibody, and treatment of pitpα –/– /β –/– mice in vivo with anti–TGF-β antibodies completely reverted their defects in BM HSC and HPC numbers. TGF-β and IL-4 synergized to inhibit HPC colony formation in vitro. Electron microscopy analysis of pitpα –/– /β –/– MKs revealed ultrastructural defects with depleted α-granules and large, misshaped multivesicular bodies. Von Willebrand factor and thrombospondin-1, like TGF-β, are stored in MK α-granules and were also elevated in CM of cultured pitpα –/– /β –/– MKs. Altogether, these data show that ablating PITPs in MKs indirectly dysregulates hematopoiesis in the BM by disrupting α-granule physiology and secretion of TGF-β1. Capitano, M., Zhao, L., Cooper, S., Thorsheim, C., Suzuki, A., Huang, X., Dent, A. L., Marks, M. S., Abrams, C. S., Broxmeyer, H. E. American Society of Hematology (ASH) 0006-4971 00064971 1528-0020 15280020 |
| shingle_title_1 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| shingle_title_2 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| shingle_title_3 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| shingle_title_4 | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| timestamp | 2025-06-30T23:36:43.370Z |
| titel | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| titel_suche | Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-{beta}1 secretion and hematopoiesis in mice |
| topic | W WW-YZ |
| uid | ipn_articles_6329060 |