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- Author(s):
- Bruckmeier, Martin; Kuehnl, Andreas; Culmes, Mihaela; Pelisek, Jaroslav; Eckstein, Hans-Henning
- Title:
- Impact of oxLDL and LPS on C-type Natriuretic Peptide System is Different between THP-1 Cells and Human Peripheral Blood Monocytic Cells
- Abstract:
- Background: The C-type natriuretic peptide (CNP) has anti-inflammatory, anti-proliferative, and anti-migratory properties. The purpose of this study was to investigate the occurrence of CNP and its receptors (NPR2 and NPR3) in a human monocytic cell line (THP-1 cells) as well as in peripheral blood monocytic cells (PBMC). Impact of both, LPS and human oxLDL on expression pattern of CNP and its receptors shall be studied. Methods: Cells were cultured in standard medium with or without LPS or oxLDL. Expression levels of CNP, NPR2, NPR3, TNF-α, IL-1β, IL-6, CD14 and CD68 were measured at baseline, 24h, and 48h. Results: Baseline expression of all analysed genes was significantly higher in PBMC compared to THP-1 cells (all p<0.05). Expression levels of CNP, IL-1β, IL-6, and CD14 were significantly increased in PBMC following stimulation with LPS. In contrast, in THP-1 cells stimulated by LPS, significant increase in expression was found only for IL-6 (p=0.007). In THP-1 cells, oxLDL increased the expression levels of NPR3, TNF-α, IL-1β, IL-6, CD14, and CD68 significantly. In contrast, expression level of NPR2 was diminished by oxLDL (p=0.007). In PBMC NPR3 was significantly down-regulated (p=0.002). Treatment with oxLDL for 48h increased NPR2/3-ratio significantly in PBMC (22.5 vs. 4.8, p=0.010). In contrast, in THP-1 cells, NPR2/3-ratio was lowered significantly by oxLDL (0.31 vs. 17.0, p=0.008). Conclusion: Treatment with LPS or oxLDL leads to diverging changes in gene expression PBMC and THP-1 cells. With respect to CNP and its receptors, data gained from THP-1 cells should be further validated using naive human peripheral blood monocytes. However, THP-1 cells can serve as a negative control for e.g. future signalling pathway studies related to oxLDL effect on CNP system in monocytes/macrophages.
- Keywords:
- C-type natriuretic peptide; Monocytes; THP-1 cells; Atherosclerosis; Gene expression
- Journal title:
- Cellular Physiology and Biochemistry
- Year:
- 2012
- Journal volume:
- 30
- Journal issue:
- 1
- Pages contribution:
- 199--209
- Fulltext / DOI:
- doi:10.1159/000339044
- Publisher:
- S. Karger AG
- Publisher address:
- Basel, Switzerland
- Print-ISSN:
- 1421-9778
- E-ISSN:
- 1421-9778
- Notes:
- Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
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