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Knockout of Sphingosine Kinase 1 Attenuates Renal Fibrosis in Unilateral Ureteral Obstruction Model
- Source :
- Am J Nephrol
- Publication Year :
- 2019
- Publisher :
- S. Karger AG, 2019.
-
Abstract
- Background: Sphingosine-1-phosphate (S1P) is a bioactive sphingolipid metabolite involved in various diseases. S1P also plays significant roles in the differentiation of fibroblasts into myofibroblasts, being implicated in fibrotic diseases. S1P is produced by the phosphorylation of sphingosine catalyzed by sphingosine kinases (SphK1 and SphK2). It remains unclear if the activation of endogenous SphK1 contributes to fibrogenesis in kidneys. The present study determined the effect of SphK1 gene knockout (KO) on fibrotic markers in kidneys. Methods: The renal fibrosis was produced using the unilateral ureteral obstruction (UUO) model in wild-type (WT) and SphK1 gene KO mice. Renal mRNA levels of SphK1 and S1P receptors (S1PR) were measured by real-time RT-PCR. Fibrotic and immune cell markers in kidneys were measured by Western blot analysis and immunostaining, respectively. Renal morphological damage was examined by Periodic-Acid Schiff staining. Results: The mRNA levels of SphK1 and S1PRs were dramatically increased in renal tissues of WT-UUO mice, whereas the increase in renal SphK1 mRNA was blocked in KO-UUO mice. Interestingly, the increased levels of fibrotic markers, collagen and α-smooth muscle actin, in kidneys were significantly attenuated in KO-UUO versus WT-UUO mice. Meanwhile, kidney damage indices were remarkably attenuated in KO-UUO mice compared with WT-UUO mice. However, increased numbers of CD43+ and CD48+ cells, markers for T cell and macrophage, respectively, showed no significant difference between ­WT-UUO and KO-UUO kidneys. Conclusion: The activation of the SphK1-S1P pathway may contribute to tubulointerstitial fibrosis in UUO kidneys by affecting fibrotic signaling within renal cells independent of immune modulation.
- Subjects :
- Male
medicine.medical_specialty
030232 urology & nephrology
030204 cardiovascular system & hematology
Kidney
urologic and male genital diseases
Article
Mice
03 medical and health sciences
chemistry.chemical_compound
0302 clinical medicine
Internal medicine
medicine
Renal fibrosis
Animals
Sphingosine-1-phosphate
Phosphorylation
Renal Insufficiency, Chronic
Receptor
Inflammation
Mice, Knockout
biology
Sphingosine
urogenital system
business.industry
Fibroblasts
Fibrosis
female genital diseases and pregnancy complications
Mice, Inbred C57BL
Disease Models, Animal
Phosphotransferases (Alcohol Group Acceptor)
SPHK2
Endocrinology
medicine.anatomical_structure
chemistry
Sphingosine kinase 1
Nephrology
Immune System
biology.protein
Tubulointerstitial fibrosis
business
Gene Deletion
Ureteral Obstruction
Subjects
Details
- ISSN :
- 14219670 and 02508095
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- American Journal of Nephrology
- Accession number :
- edsair.doi.dedup.....379e5b61e5ec09d5040324967c53b97e