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Sphingosine transfer in cell-to-cell interaction

S Inooka1, T Toyokuni

  • 1Faculty of Agriculture, Tohoku University, Sendai, Japan.

Biochemical and Biophysical Research Communications
|January 26, 1996
PubMed
Summary

This study explored whether sphingosine (Sph), a type of lipid, can move between different types of cells and within the same cell type. Using murine lymphocytes and fibroblasts, the researchers found that Sph can be transferred from fibroblasts to lymphocytes and between lymphocytes when one group was treated with a chemical that blocks ceramide production. The transfer was tracked by measuring how much Sph was converted into another lipid called GlcCer in the recipient cells. The results suggest that Sph can move between cells regardless of their type, and the speed of transfer depends on the cells' ability to convert Sph into GlcCer. This finding may help scientists better understand how lipids are shared in complex tissues.

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Area of Science:

  • Cell signaling and lipid metabolism
  • Immunology and lymphocyte function
  • Membrane biochemistry and sphingolipid dynamics

Background:

Prior research has shown that sphingolipids play a role in cell communication and membrane function, but the extent of intercellular transfer of sphingosine (Sph) remains unclear. It was already known that different cell types handle Sph metabolism at varying rates. No prior work had resolved whether Sph could move between cells, especially between lymphocytes and fibroblasts. This gap motivated investigations into how Sph is transferred between heterogeneous and homogeneous cell populations. The uncertainty around whether Sph is actively transported or passively shared remained unresolved in prior studies. Researchers had not yet tested if Sph could be transferred from fibroblasts to lymphocytes. The question of whether Sph transfer is cell-type specific or universally possible remained open. This uncertainty drove the current study to explore intercellular Sph dynamics using murine lymphocytes and fibroblasts. The need to understand how Sph is distributed between cells in different contexts is central to lipid signaling research.

Keywords:
Sphingosine transferCell interactionLipid metabolismGlucosylceramide formation

Frequently Asked Questions

The study shows that sphingosine (Sph) can be transferred between heterogeneous and homogeneous cell types, as indicated by the formation of GlcCer in recipient cells.

Murine CTLL lymphocytes and A31 fibroblasts were used as donor and recipient cells to test Sph transfer.

Sph transfer was measured by detecting the conversion of radioactive Sph into GlcCer in recipient cells.

Fumonisin B1 was used to inhibit ceramide biosynthesis in donor CTLL cells, allowing researchers to test homogeneous cell transfer.

CTLL cells convert Sph into GlcCer within 30 minutes, while A31 cells require more than 2 hours.

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Purpose Of The Study:

The aim of this study was to determine whether sphingosine (Sph) could be transferred between different cell types and within the same cell type. This paper specifically tested if Sph could move from fibroblasts to lymphocytes and from one lymphocyte population to another. The researchers sought to clarify the mechanisms of intercellular Sph transfer using murine CTLL and A31 cells. The study aimed to distinguish between active and passive transfer mechanisms by comparing heterogeneous and homogeneous cell interactions. The motivation stemmed from the need to understand how Sph is distributed in mixed cell environments. The study focused on the role of Sph conversion into glucosylceramide (GlcCer) as a marker of transfer. The researchers wanted to determine if Sph transfer is dependent on cell type and metabolic activity. This work aimed to provide insights into the dynamics of Sph movement between cells.

Main Methods:

The researchers used murine CTLL and A31 cells to test intercellular transfer of Sph. Donor cells were labeled with radioactive Sph and incubated with recipient cells. The conversion of Sph into GlcCer was measured as an indicator of transfer. CTLL cells were chosen as recipients due to their rapid Sph metabolism. A31 cells were used as donors because of their slower Sph conversion. Fumonisin B1-treated CTLL cells were also used as donors to test homogeneous transfer. The study compared heterogeneous and homogeneous cell interactions. The experiments tracked Sph movement using radiolabeled compounds and metabolic analysis.

Main Results:

The experiments showed that Sph could be transferred between heterogeneous and homogeneous cells. Sph moved from A31 fibroblasts to CTLL lymphocytes within the incubation period. Sph was also transferred between CTLL cells when one population was fumonisin B1-treated. The transfer was indicated by the appearance of GlcCer in recipient cells. The rate of transfer varied between cell types. CTLL cells converted Sph to GlcCer faster than A31 cells. The presence of fumonisin B1 in donor CTLL cells did not block Sph transfer. These findings suggest that Sph transfer is possible across different cell types.

Conclusions:

The authors propose that Sph can be transferred between heterogeneous and homogeneous cell populations. This transfer is indicated by the formation of GlcCer in recipient cells. The findings suggest that Sph movement is not limited to a single cell type. The study supports the possibility of intercellular Sph transfer in mixed cell environments. The authors suggest that Sph transfer may depend on the metabolic state of the donor cells. The presence of fumonisin B1 in donor CTLL cells did not prevent transfer. The results imply that Sph can move between cells regardless of type. These findings may have implications for understanding lipid signaling in complex tissues.

The authors suggest that Sph transfer is possible between different cell types and may depend on the metabolic activity of donor cells.