Stable cell fate changes in marrow cells induced by lung-derived microvesicles

Area of Science:

• Cellular Biology
• Molecular Biology
• Genetics

Background:

• Cellular-derived microvesicles are known to influence target cell fate.
• The stability and mechanisms of these changes, particularly in marrow cells, remain largely unknown.
• Lung-derived microvesicles (LDMV) are investigated for their potential to modify target cell phenotypes.

Purpose of the Study:

• To investigate the long-term effects of LDMV on marrow cell transcriptome and proteome.
• To elucidate the mechanism by which LDMV induce stable changes in target cells.
• To determine if LDMV can induce a stable, functional alteration in marrow cell identity.

Main Methods:

• Co-culture of whole bone marrow cells (WBM) with LDMV.
• Transplantation of LDMV-treated WBM into recipient mice.
• Analysis of recipient tissues (WBM, spleen, liver, lungs) for lung-specific gene expression via RT-PCR and immunohistochemistry.
• In vitro culture of WBM with LDMV, followed by molecular analysis (RT-PCR, Western Blot, microarrays) over 12 weeks.

Main Results:

• LDMV-treated WBM, when transplanted, expressed pulmonary epithelial cell genes in various tissues of recipient mice.
• A significant increase in marrow-derived type II pneumocytes was observed in the lungs of mice receiving LDMV-treated WBM.
• In vitro studies showed sustained expression of pulmonary genes and proteins in LDMV-co-cultured WBM for up to 12 weeks, indicating de novo transcription.
• Proteomic and microRNA profiles were altered, supporting a stable transcriptional mechanism.

Conclusions:

• Microvesicle-mediated alteration of cell fate is robust and long-lasting.
• LDMV induce stable changes in marrow cells primarily through the transfer of transcriptional regulators.
• This represents a novel and significant mechanism in cellular biology.