Renal and Peripheral Hemodynamic Function in Patients With Type 1 Diabetes Mellitus

Diabetes Mellitus, Type 1 Clinical Trial

Official title:

The Effect of Protein Kinase C Inhibition on Renal and Peripheral Hemodynamic Function in Patients With Type 1 Diabetes Mellitus

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00297401
• Other study ID #: 8023
• Secondary ID: B7A-CA-S003
• Status: Completed
• Phase: Phase 3
• First received: February 24, 2006
• Last updated: August 25, 2016
• Start date: March 2006
• Est. completion date: November 2007

Study information

• Verified date: August 2016
• Source: Chromaderm, Inc.
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Health Canada
• Study type: Interventional

Clinical Trial Summary

Protein kinase C (PKC), an enzyme in the body, has been implicated in the process of diabetic microvascular complications. The purpose of this study will be to evaluate the renal hemodynamic and peripheral vascular effects of PKC inhibition with ruboxistaurin mesylate (an inhibitor of PKC) in patients with Type 1 diabetes mellitus and evidence of early nephropathy. In this pilot study, 21 patients with type 1 diabetes were planned to be randomized to LY333531 or placebo in a 2:1 fashion, after an initial period of testing. After 8 weeks of study drug, patients were retested.

Description:

This is a pilot study with 3 parts. Twenty-one patients with type 1 diabetes will be randomized to LY333531 or placebo in a 2:1 fashion. Each patient will be studied on four occasions, while euglycemic and while hyperglycemic without PKC inhibition and while euglycemic and hyperglycemic after an eight-week period of PKC inhibition.

Study Part 1: The impact of PKC inhibition on the renal and peripheral hemodynamic response to hyperglycemia On the evening prior to the first study day, the study participants will be admitted to an in-patient research facility with overnight plasma glucose levels maintained at 4-6 mmol/L using a modified glucose clamp technique. The next day, baseline measures of endothelial function and vascular compliance, mean arterial pressure (MAP), and renal function, including glomerular filtration rate (GFR), effective renal plasma flow (ERPF), renal blood flow (RBF), filtration fraction (FF) and renal vascular resistance (RVR) will be obtained using inulin and para-aminohippurate. In all diabetic subjects, euglycemia or hyperglycemia will be maintained by modified overnight glucose clamping techniques. During the second day of the study, capillary blood glucose will be maintained at 9-11 mmol/l overnight, and the renal and peripheral vascular hemodynamic measurements will be repeated the following day. The subjects will then be given the PKC-inhibitor LY333531 (or placebo) for 6 weeks, after which the study will be repeated. The first dose of LY333531 will be taken at 0800 hrs the day after the completion of Study 1 The dose will consist of 32 mg PO OD. Study participants will monitor their capillary blood glucose levels on a four times daily schedule.

Study Part 2: The impact of PKC inhibition on the response to Ang II On the evening prior to the first study day, the study participants will be admitted to an in-patient research facility with overnight plasma glucose levels maintained at 4-6 mmol/L using a modified glucose clamp technique. The next day, baseline measures of renal function, including GFR, ERPF, RBF, FF and RVR will be obtained. Graded Ang II infusion will be administered, and the response of MAP, GFR, RPF, RBF, FF and RVR will be measured. The subjects will then be given the PKC-inhibitor LY333531 (or placebo) for 8 weeks, as previously described, after which the study will be repeated.

Study Part 3: The impact of PKC inhibition on proteinuria . Subjects will collect a 24 hour urine sample for protein / albumin excretion. They will subsequently be randomized to receive either the PKC inhibitor LY333531 or placebo, using a table of random numbers. After 8 weeks treatment, the 24 hour urine sample will again be collected.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 20
• Est. completion date: November 2007
• Est. primary completion date: November 2007
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• have type 1 diabetes mellitus

• hemoglobin A1C between 6 and 10%

• have evidence of early diabetic renal disease as determined by creatinine clearance more than 80 ml/minute, urine albumin to creatinine ratio of more than 3.0 and urinary albumin levels consistent with the diagnosis of diabetic nephropathy (more than 20 mg/mmol for men and more than 28 mg/mmol for women)

• are without language barrier, cooperative, expected to return for all follow-up visits, and who give informed consent before entering the study's randomization phase and after being informed of the study medications and procedures.

Exclusion Criteria:

• Have poorly controlled diabetes, chronic liver disease, clinical jaundice, and/or elevation of liver-related laboratory results, have chronic renal failure on dialysis, have received a kidney transplant or have a moderate to severe kidney disease, have previous history of myocardial infarction, stroke, claudication or amputation, have cancer and are currently receiving chemotherapy or plan to receive chemotherapy in the next 6 months and woman of childbearing potential despite actively practicing birth control by using a medically accepted device or therapy.

• are being treated or intending to start treatment during the trial with excluded drugs: topical or oral carbonic anhydrase inhibitors and require more than 2 weeks of treatment with drugs known to strongly inhibit cytochrome P450 3A4 (CYP3A4), including but not limited to, delavirdine, fluconazole, itraconazole, indinavir, ketoconazole mibefradil, nelfinavir, ritonavir, and saquinavir.

• consume alcohol, tobacco and nicotine products within 48 hours before the study and have any condition that, in the investigator's opinion, would preclude meaningful participation in the study, including, but not limited to, abnormal laboratory values the investigator considers clinically significant, patients who are poor medical or psychiatric risks for treatment with an investigational drug, patients who are unlikely to complete the study.

• suspected or proven to have a kidney disease other than diabetic related albuminuria and/or renal insufficiency.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment

Related Conditions & MeSH terms

• Diabetes Mellitus
• Diabetes Mellitus, Type 1

Intervention

Drug:
• ruboxistaurin
32 mg, QD, PO, up to 8 weeks
• placebo
QD, PO, up to 8 weeks

Locations

Country	Name	City	State
Canada	For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM - 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physcian.	Toronto	Ontario

Sponsors (2)

Lead Sponsor	Collaborator
Chromaderm, Inc.	Heart and Stroke Foundation of Canada

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Primary outcomes will be the change in proteinuria, pre- and post-treatment with ruboxistaurin.		Baseline and 8 weeks	Yes
Primary	Change in the renal and peripheral pressor response to hyperglycemia pre and post treatment with ruboxistaurin		Baseline and 8 weeks	Yes
Primary	Change in the renal and peripheral pressor response to Angiotensin II pre and post-treatment with ruboxistaurin.		Baseline and 8 weeks	Yes
Secondary	Secondary analyses will consist of the change in endothelial function and vascular compliance pre- and post-treatment with ruboxistaurin.		Baseline and 8 weeks	Yes

External Links

•   Lilly Clinical Trial Registry