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Distribution of platelet activating factor receptor mRNA along the rat nephron segments
K Asano1, S Taniguchi, A Nakao
1First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
Abstract:
Platelet activating factor (PAF) receptor mRNA was semi-quantitated in microdissected rat nephron segments by the reverse transcription-polymerase chain reaction (RT-PCR). PCR primers were designed from two alternative splicing isoforms of rat PAF receptor cDNA; a homologue of human leukocyte PAF receptor cDNA (p172) and the other with a unique sequence in the 5'-noncoding region upstream of the splice acceptor site (p18). Only the expression of mRNA corresponding to p172 was detectable, which was most abundant in the glomerulus, followed in order by: proximal convoluted tubule > proximal straight tubule > outer medullary and cortical collecting duct, distal convoluted tubule > thick ascending limb of Henle's loop. These results suggest the potential physiological roles of PAF in the entire renal tubule as well as in the glomerulus.
Insights
Platelet activating factor (PAF) receptor mRNA was found in rat kidneys, primarily in the glomerulus and tubules. This suggests PAF plays a role throughout the entire kidney.
Area of Science:
- Nephrology
- Molecular Biology
- Pharmacology
Background:
- Platelet-activating factor (PAF) is a potent lipid mediator involved in inflammation and immune responses.
- The distribution and function of the PAF receptor in the kidney are not fully understood.
- Understanding PAF receptor expression is crucial for elucidating its role in renal physiology and pathology.
Purpose of the Study:
- To investigate the expression and localization of Platelet Activating Factor (PAF) receptor mRNA in different segments of the rat nephron.
- To determine which PAF receptor splice variants are expressed in the rat kidney.
Main Methods:
- Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) was employed.
- Rat nephron segments were microdissected for analysis.
- PCR primers were designed based on two known splice isoforms of rat PAF receptor cDNA (p172 and p18).
Main Results:
- Only the mRNA corresponding to the p172 splice variant (homologous to human leukocyte PAF receptor) was detected.
- PAF receptor mRNA expression was most abundant in the glomerulus.
- Significant expression was also observed in the proximal convoluted tubule, proximal straight tubule, outer medullary and cortical collecting duct, and distal convoluted tubule, with lower levels in the thick ascending limb of Henle's loop.
Conclusions:
- The p172 splice variant of the PAF receptor is expressed in various segments of the rat kidney.
- PAF receptor expression is widespread throughout the nephron, with highest levels in the glomerulus.
- These findings indicate potential physiological roles for PAF signaling in both glomerular and tubular functions within the kidney.