What question did this study set out to answer?

To elucidate how the physical interaction between glycoprotein Ibα and the cytoskeletal anchor filamin A regulates megakaryocyte membrane architecture and platelet biogenesis.

November 3, 2023Blood

GPIbα–filamin A interaction regulates megakaryocyte localization and budding during platelet biogenesis

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Authors

MEMarc Ellis ATAntoine Terreaux IAImala Alwis

Discussion

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Overview

Transgenic mouse study demonstrates that disrupted GPIbα–filamin A linkage impairs megakaryocyte budding in mice, highlighting a structural mechanism for macrothrombocytopenia.

Key Points

To elucidate how the physical interaction between glycoprotein Ibα and the cytoskeletal anchor filamin A regulates megakaryocyte membrane architecture and platelet biogenesis.
Generated transgenic mouse models lacking endogenous mouse GPIbα and expressing either human wild-type GPIbα (hGPIbαWT) or a filamin A-binding-deficient mutant (hGPIbαFW).
Characterized platelet counts, platelet clearance, megakaryocyte demarcation membrane system (DMS) ultrastructure, and the directional release of membrane buds into the bone marrow.
Mice expressing mutant hGPIbαFW developed macrothrombocytopenia despite normal GPIb surface expression, normal platelet clearance rates, and unimpaired proplatelet formation.
Mutant megakaryocytes exhibited defective DMS formation, peripheral redistribution of filamin A, and production of enlarged membrane buds misdirected into the marrow interstitium rather than the vasculature.
Re-establishing the interaction between filamin A and GPIbα normalized filamin A localization, corrected DMS defects, and restored normal bud size and delivery into sinusoids.

Cite This Study

Ellis et al. (2023) studied this question.

synapsesocial.com/papers/6aab60cf4c7bf2dc6df75643 https://doi.org/10.1182/blood.2023021292

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November 3, 2023Blood

GPIbα–filamin A interaction regulates megakaryocyte localization and budding during platelet biogenesis

View Full Paper

Ask AI

Bookmark

Authors

MEMarc Ellis ATAntoine Terreaux IAImala Alwis

Discussion

Member takes

Overview

Transgenic mouse study demonstrates that disrupted GPIbα–filamin A linkage impairs megakaryocyte budding in mice, highlighting a structural mechanism for macrothrombocytopenia.

Key Points

To elucidate how the physical interaction between glycoprotein Ibα and the cytoskeletal anchor filamin A regulates megakaryocyte membrane architecture and platelet biogenesis.
Generated transgenic mouse models lacking endogenous mouse GPIbα and expressing either human wild-type GPIbα (hGPIbαWT) or a filamin A-binding-deficient mutant (hGPIbαFW).
Characterized platelet counts, platelet clearance, megakaryocyte demarcation membrane system (DMS) ultrastructure, and the directional release of membrane buds into the bone marrow.
Mice expressing mutant hGPIbαFW developed macrothrombocytopenia despite normal GPIb surface expression, normal platelet clearance rates, and unimpaired proplatelet formation.
Mutant megakaryocytes exhibited defective DMS formation, peripheral redistribution of filamin A, and production of enlarged membrane buds misdirected into the marrow interstitium rather than the vasculature.
Re-establishing the interaction between filamin A and GPIbα normalized filamin A localization, corrected DMS defects, and restored normal bud size and delivery into sinusoids.

Cite This Study

Ellis et al. (2023) studied this question.

synapsesocial.com/papers/6aab60cf4c7bf2dc6df75643 https://doi.org/10.1182/blood.2023021292

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