The ApoM/S1P-complex: its role in vascular inflammatory disease and interaction with S1P-receptors

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)


HDL is believed to be protective against cardiovascular disease (CVD) via the reverse cholesterol transport and anti-inflammatory actions in the vessel. Apolipoprotein M (apoM) is an apolipoprotein mainly associated with HDL. Recently ApoM was proven to
be the main carrier of Sphingosine 1-phosphate (S1P) in circulation. SIP is a signaling phospholipid involved in the immune system, exerting most of its effects through signaling via 5-G-protein coupled receptors; SlPl-5.

The aim of this thesis is to investigate the role of the apoM/SlP-complex in vascular inflammatory diseases such as atherosclerosis and sepsis. We also want to study the interaction between the apoM/SlP-complex and the SlP-receptors.

We developed a liquid chromatography-tandem mass spectrometry method for SlP-quantification in plasma and cell extracts. We found that plasma levels of SIP and apoM were decreased in sepsis, levels reflecting the severity of the disease. The apoM/SlP-complex contributes to the anti-inflammatory effects exerted by HDL as shown in vitro by its inhibiting potential of pro-inflammatory adhesion molecules on the endothelial surface and by its increment of the endothelial barrier function. Plasma levels of apoM and SIP in type-l-diabetes (TlD)- patients (who have increased risk of developing CVD) were not altered compared to healthy controls. However, HDL-particles from TlD showed decreased anti-inflammatory effects which were not related to reduced presence of apoM and S1P. The apoM/S1P-complex could interact with all SlP-receptors as shown by internalization of
fluorescently labelled S1P-receptors overexpressed in HEK293-cells. Interestingly, extracellular levels of apoM and SIP could detemine which receptor was available at the cellular surface.

ln conclusion, our data suggest apoM and SlP to have a role in acute and chronic inflammation. Future research could help us clarify how the apoM/SlP-complex signals through the different SlP-receptors in different inflammatory disorders and hence contribute in developing new therapies against diseases in the vasculature.


Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Medicin och hälsovetenskap


Tilldelande institution
Handledare/Biträdande handledare
Tilldelningsdatum2016 dec 2
  • Lund University: Faculty of Medicine
Tryckta ISBN978-91-7619-368-6
StatusPublished - 2016


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Cecilia Frej, Adam Linder, Kaisa E. Happonen, Fletcher B. Taylor, Florea Lupu & Björn Dahlbäck, 2016 jun 1, I: Journal of Cellular and Molecular Medicine. 20, 6, s. 1170-1181 12 s.

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