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Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation

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Two different functions for CD44 proteins in human myelopoiesis

J Moll¹, S Khaldoyanidi, J P Sleeman

¹Forschungszentrum Karlsruhe, Institut für Genetik, P.O. Box 3640, D-76021 Karlsruhe, Germany. Juergen.Moll@igen.fzk.de

The Journal of Clinical Investigation

|September 3, 1998

Summary

Variant CD44 proteins play crucial roles in myelopoiesis. This study reveals CD44v4-v10 expression enhances hyaluronate binding and cell adhesion, impacting myeloid differentiation and colony formation.

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Published on: August 9, 2019

Area of Science:

Hematology
Cell Biology
Molecular Biology

Background:

CD44 is vital for myelopoiesis, but the roles of its variant proteins remain largely unknown.
Understanding CD44 variant functions is key to deciphering hematopoietic stem cell regulation.

Purpose of the Study:

To investigate the specific contributions of different CD44 variant proteins during human myelopoiesis.
To elucidate the functional significance of CD44 variant expression in myeloid progenitor cells.

Main Methods:

Utilized human long-term bone marrow cultures and antibody blockade (mab 25-32, mab VFF18) to assess myelopoiesis.
Employed human myeloid progenitor cell lines to study CD44 variant protein expression and function.
Analyzed hyaluronate (HA) and chondroitin sulphate A (CS-A) binding capabilities.

Main Results:

Antibodies targeting CD44 NH2-terminal and CD44v6 epitopes differentially inhibited myelopoiesis, suggesting distinct cellular targets.
CD44v4-v10 variant expression was induced during myeloid differentiation, enhancing HA and CS-A binding.
HA binding mediated by CD44v4-v10 promoted cellular self-aggregation and stromal cell adhesion.

Conclusions:

Different CD44 proteins regulate distinct stages of myelopoiesis.
CD44 variant expression, particularly CD44v4-v10, is critical for myeloid progenitor cell adhesion and differentiation.
Appropriate glycosylation of CD44 variants is necessary for their functional binding capabilities.