Clinical trial NCT01265615
Conditions: Cardiorenal Syndrome Chronic Allograft Nephropathy
Keywords: chronic allograft nephropathy stem-progenitor cells cardiorenal syndrome calcitriol paricalcitol cholecalciferol cardiac repair renal repair
Sponsor: Ural State Medical University
Start date: 2009-10-01; Completion date: 2010-09-01
Enrollment: 109 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
We hypothesize that paricalcitol and calcitriol in dose-dependent manner are effective for the management of chronic allograft dysfunction (CAD), protection and repair of kidney and heart, management of chronic renocardiac syndrome (CRS). We assume that paricalcitol can have some advantages if compare with calcitriol or cholecalciferol due to absence of calcemic and phosphatemic complications alongside with great beneficial potential.

Detailed description:
Paricalcitol and calcitriol are identically effective for the management of chronic allograft dysfunction (CAD), protection and repair of kidney and heart, management of chronic renocardiac syndrome (CRS). Vitamin D can reduce progression of CAD. Activation of VDR in proximal part of nephron leads to rapid non-genomic beneficial effects with urgent multilevel protection of the most functionally important portion of kidney. Rising expression of VDR in distal portions of nephron stimulates slows genomic effects with some local repair responses.

Hormone D may stimulate recruitment and activity of the different origin stem-progenitor cells (SPCs) with beneficial effects on different stages of regeneration by force of para- and autocrine activity. SPCs are revealing mostly in interstitium and among fibroblast-like cells. Vitamin D did not confirm efficacy as a tool for management of mesenchymal stem cells (MSCs) in human however it needs more research experimental evidences due to multifactorial influence on SPCs in human being including immunosuppressive and bone-marrow-related effects of cyclosporine in kidney transplant (Tx) patients. Paricalcitol and calcitriol can slow down migration and infiltration of MSC into interstitium and vessel wall. The side population of mature and SPCs (first of all, with bone-marrow and mesenchymal phenotype) is the most metabolically and functionally active portion of cells with high sensitivity to vitamin D receptor (VDR) activation that responsible for repair of tissue.

The most optimal scheme of treatment with vitamin D in patients with CAD and CRS is an administration of paricalcitol with dose 2-4 μg daily and supplemental intake of vitamin D including special diet, multivitamins, and others with optimal dose until 1800 international units (IU) but excluding insolation as a factor of skin carcinoma. High-dose medicinal intake of calcitriol (until 6 mcg and higher) showed relatively high efficacy but rather excessive level of complications mediated with mineral metabolism.

Paricalcitol and calcitriol may significantly improve contractility of myocardium and reduce cardiovascular risk, heart failure (HF) and hypertension with some beneficial effects on cardiorenal axis and renin-angiotensin-aldosterone system.

Arms: arm 1: 6-8 μg daily per os (orally) without special diet arm 2: 2-4 μg daily orally under with dietary restrictions of vitamin D arm 3: alendronate sodium/ cholecalciferol capsules with recommended daily allowance equals 1200-2400 IU per day arm 4: intake of cholecalciferol in food and multivitamins, less than 400-900 IU per day
Interventions: intervention 1: Paricalcitol intervention 2: Calcitriol intervention 3: Cholecalciferol intervention 4: Supplemental
Intervention descriptions: intervention 1: paricalcitol group (6-8 μg daily per os - orally - without special diet) intervention 2: calcitriol group (2-4 μg daily orally under with dietary restrictions of vitamin D) intervention 3: cholecalciferol group (intake of cholecalciferol with recommended daily allowance equals 1200-2400 IU per day) intervention 4: intake of cholecalciferol in food and multivitamins, less than 400-900 IU per day

Protocol documents: