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Vascular and glomerular effects of Clostridium difficile toxin A peptide on the isolated rat kidney
H S Monteiro1, M S Santos-Neto, A V Oliveira
1Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, Fortaleza, Brasil.
Abstract:
Toxin A peptide from Clostridium difficile caused damage and secretion in the intestinal mucosa. These effects are mediated in part by pro-inflammatory substances. In order to evaluate and compare the biologic effect of toxin A on renal vascular, glomerular and tubular functions, we studied this toxin in isolated rat kidneys. Isolated kidneys from adult male Wistar rats (260-320 g) were perfused with Krebs-Henseleit solution containing 60 mg/ml dialyzed bovine serum albumin. We studied the effect of toxin A peptide (3.2 x 10(-6) M, injected into perfusate) on glomerular filtration rate (GFR), urinary flow rate (UF) and total sodium reabsorption (TNa+, %). All experiments were preceded by a 30-min basal period, and in another group of kidneys the time course of the variables was followed without toxin infusion for unpaired control. Toxin A (TxA) reduced the perfusion pressure (PP), from PPcontrol/30min = 124.89 +/- 1.91 to PPTxA/120min = 88.13 +/- 5.1 mmHg (N = 6, P < 0.01) with a maximal effect at 120 min after toxin infusion. TxA also caused a significant decrease in GFR with maximal effect at 90 min after toxin infusion (GFRcontrol/30min = 0.53 +/- 0.05 to GFRTxA/90min = 0.30 + 0.05 ml min-1g-1; N = 6, P < 0.01). TxA did not alter renal tubular sodium transport when compared with a control without toxin infusion. In addition, toxin-treated kidneys caused a time-dependent increase in urinary flow from UFcontrol/30min = 0.16 +/- 0.08 to UFTxA/120min = 0.35 +/- 0.1 ml min-1g-1 (N = 6, P < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Clostridium difficile Toxin A significantly impacts kidney function, reducing perfusion pressure and glomerular filtration rate in isolated rat kidneys. However, it does not affect renal tubular sodium transport.
Area of Science:
- Nephrology
- Toxicology
- Gastroenterology
Background:
- Clostridium difficile Toxin A is known to cause intestinal damage and inflammation.
- The systemic effects of Toxin A on renal function are not well understood.
Purpose of the Study:
- To investigate the effects of Clostridium difficile Toxin A on renal vascular, glomerular, and tubular functions.
- To compare the biologic impact of Toxin A on isolated rat kidneys.
Main Methods:
- Isolated adult male Wistar rat kidneys were perfused with Krebs-Henseleit solution.
- Toxin A peptide was infused into the perfusate at a concentration of 3.2 x 10(-6) M.
- Glomerular filtration rate (GFR), urinary flow rate (UF), and perfusion pressure (PP) were measured.
Main Results:
- Toxin A significantly reduced perfusion pressure, with maximal effect at 120 minutes post-infusion.
- A significant decrease in GFR was observed, peaking at 90 minutes after Toxin A infusion.
- Toxin A did not alter renal tubular sodium transport but caused a time-dependent increase in urinary flow.
Conclusions:
- Clostridium difficile Toxin A exerts significant detrimental effects on renal vascular and glomerular functions.
- The toxin's impact on renal tubular sodium transport appears minimal.
- Further research is warranted to elucidate the mechanisms behind Toxin A-induced renal dysfunction.