Key result
In rats with puromycin aminonucleoside-induced nephrotic syndrome, urinary sodium excretion transiently increased on day 1, decreased significantly on days 7 to 9, and returned to baseline by day 12, indicating three distinct stages of sodium and water retention.
Why the study?
Nephrotic syndrome is characterized by renal sodium and water retention, but the underlying mechanisms are not fully elucidated.
Does puromycin aminonucleoside alter sodium transporters and urinary sodium excretion in male SD rats?
Does puromycin aminonucleoside alter sodium transporters and urinary sodium excretion in male SD rats?
In a rat model of nephrotic syndrome, sodium and water retention occurs in distinct stages driven by dynamic changes in renal sodium transporters and aquaporin 2, independent of the angiotensin system.
This is the authors' abstract. We don't add key points for this paper.
Introduction Nephrotic syndrome (NS) is characterized by renal sodium and water retention. The mechanisms are not fully elucidated. Methods The NS rat model was established by single intraperitoneal injection of 100 mg/kg puromycin aminonucleoside (PAN). The plasma electrolyte level and urinary sodium excretion were monitored dynamically. The changes of some sodium transporters, including epithelial Na+ channel (ENaC), Na+/H+ exchanger 3 (NHE3), Na+-K+-2Cl− cotransporter 2 (NKCC2) and Na+-Cl− cotransporter (NCC) in renal cortex at different time points and the level of peripheral circulation factors were detected. Results The urinary sodium excretion of the model group increased significantly on the first day, then decreased compared with the control group, and there was no significant difference between the model group and the control group on the 12th day. The changes of peripheral circulation factors were not obvious. Some sodium transporters in renal cortex increased in varying degrees, while NKCC2 decreased significantly compared with the control group. Conclusions The occurrence of NS edema may not be related to the angiotensin system. The decrease of urinary sodium excretion is independent of the development of albuminuria. During the 18 days of observation, it can be divided into three stages: sodium retention, sodium compensation, and simple water retention. The mechanism is related to the increased expression of α-ENaC, γ-ENaC, NHE3 and NCC in a certain period of time, the compensatory decrease of NKCC2 expression and the continuous increase of aquaporin 2 (AQP2) expression.
Answers are grounded in this paper and cite their sources.
Dynamic transporter changes stage sodium/water retention in experimental NS; leaves open human relevance and therapeutic targeting.
No takes yet. Share an insight, caveat, or question.
Xu et al. (2023) studied Nephrotic syndrome (n=64). Puromycin aminonucleoside (PAN) vs. Pair-fed control (saline) was evaluated on Urinary sodium excretion. In rats with puromycin aminonucleoside-induced nephrotic syndrome, urinary sodium excretion transiently increased on day 1, decreased significantly on days 7 to 9, and returned to baseline by day 12, indicating three distinct stages of sodium and water retention.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: