Renal manifestations of chronic hyperoxaluria include nephrolithiasis and, when extreme, interstitial scarring and progressive loss of function. The clinical outcome can be dismal. Although primary hyperoxaluria is relatively rare, hyperoxaluria secondary to gastrointestinal malabsorption is not. Furthermore, the formation of calcium oxalate kidney stones is extremely common, and evidence suggests that minimal, perhaps transient elevations in urinary oxalate concentration may be an important factor in at least a subgroup of these patients with """"""""idiopathic"""""""" calcium oxalate urolithiasis. In the case of enteric hyperoxaluria the pathogenic role of oxalate is clear, and renal scarring is commonly observed as a consequence of oxalate exposure and calcium oxalate crystal deposition, in addition to stones. Unfortunately, few satisfactory specific treatments for enteric hyperoxaluria are available. Typical strategies include dietary restriction of oxalate to limit its delivery to the colon; low fat diets to limit malabsorption and distal colonic effects of fatty acids and bile acids; oral calcium to bind oxalate; and bile acid sequestrants like cholestyramine. In its entirety, this regimen is quite rigorous for patients, and even if compliance is achieved the therapy is not always effective. Previous studies have shown that components of the endogenous digestive microflora can utilize oxalate, potentially limiting its absorption from the intestinal lumen. A recent preliminary study demonstrated that a preparation of lactic acid bacteria degraded oxalate in vitro and reduced urinary oxalate excretion when given by mouth. We have recently demonstrated that the same preparation of lactic acid bacilli (Oxadrop(r)) can reduce urinary oxalate excretion in patients with enteric hyperoxaluria. In the current proposal, in a placebo-controlled trial we will determine the effectiveness of this and another probiotic preparation (AKSB) for the treatment of hyperoxaluria in patients with mild hyperoxaluria, as well as enteric hyperoxaluria.
Specific Aims are: 1) Determine the effect of two probiotic preparations (AKSB and Oxadrop(r)) on urinary oxalate excretion in a well-defined group of patients with enteric hyperoxaluria; and 2) Determine the effect of two probiotic preparations (AKSB and Oxadrop(r)) on urinary oxalate excretion in a well-defined group of patients with idiopathic calcium oxalate urolithiasis and mild hyperoxaluria. If results are positive, treatment for calcium oxalate kidney stones could be revolutionized.

Agency
National Institute of Health (NIH)
Institute
National Center for Complementary & Alternative Medicine (NCCAM)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21AT002534-01A1
Application #
6967849
Study Section
Special Emphasis Panel (ZAT1-JH (07))
Program Officer
Klein, Marguerite
Project Start
2005-09-30
Project End
2008-09-29
Budget Start
2005-09-30
Budget End
2006-09-29
Support Year
1
Fiscal Year
2005
Total Cost
$184,531
Indirect Cost
Name
Mayo Clinic, Rochester
Department
Type
DUNS #
006471700
City
Rochester
State
MN
Country
United States
Zip Code
55905
Lieske, John C (2017) Probiotics for prevention of urinary stones. Ann Transl Med 5:29
Pang, Ran; Linnes, Michael P; O'Connor, Helen M et al. (2012) Controlled metabolic diet reduces calcium oxalate supersaturation but not oxalate excretion after bariatric surgery. Urology 80:250-4
Lieske, John C; Tremaine, William J; De Simone, Claudio et al. (2010) Diet, but not oral probiotics, effectively reduces urinary oxalate excretion and calcium oxalate supersaturation. Kidney Int 78:1178-85
Lieske, John C; Kumar, Rajiv; Collazo-Clavell, Maria L (2008) Nephrolithiasis after bariatric surgery for obesity. Semin Nephrol 28:163-73
Sinha, M K; Collazo-Clavell, M L; Rule, A et al. (2007) Hyperoxaluric nephrolithiasis is a complication of Roux-en-Y gastric bypass surgery. Kidney Int 72:100-7