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Vol 3, No 2 (2002): Practical Diabetology
Original articles (translated)
Published online: 2002-05-13
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Long-term oral L-arginine administration improves peripheral and hepatic insulin sensitivity in type 2 diabetic patients

PierMarco Piatti, Lucilla D. Monti, Gianpietro Valsecchi, Fulvio Magni, Emanuela Setola, Federica Marchesi, Marzia Galli-Kienle, Guido Pozza, K. George M.M. Alberti
Diabetologia Praktyczna 2002;3(2):83-90.

open access

Vol 3, No 2 (2002): Practical Diabetology
Original articles (translated)
Published online: 2002-05-13

Abstract

INTRODUCTION. The aim of this study was to evaluate whether long-term administration of L-arginine acting through a normalization of NO/cyclic-guanosine- 3’,5’-cyclic monophosphate (cGMP) pathway was able to ameliorate peripheral and hepatic insulin sensitivity in 12 lean type 2 diabetic patients.
MATERIAL AND METHODS. A double-blind study was performed for 3 months. In the first month, patients were treated with their usual diet. Then they were randomly allocated into two groups. In group 1, patients were treated with diet plus placebo (orally three times per day) for 2 months. In group 2 patients were treated for 1 month with diet plus placebo (orally, three times per day) and then for 1 month with diet plus L-arginine (3 g three times per day). At the end of the first and the second month of therapy, patients underwent a euglycemic-hyperinsulinemic clamp combined with [6,6-2H2] glucose infusion. A total of 10 normal subjects underwent the same test as control subjects.
RESULTS. In group 1, no changes in basal cGMP levels, systolic blood pressure, forearm blood flow, glucose disposal, and endogenous glucose production were observed throughout. In group 2, L-arginine normalized basal cGMP levels and significantly increased forearm blood flow by 36% and glucose disposal during the clamp by 34%, whereas it decreased systolic blood pressure, and endogenous glucose production by 14 and 29%, respectively. However, compared with normal subjects, L-arginine treatment was not able to completely overcome the defect in glucose disposal.
CONCLUSIONS. L-arginine treatment significantly improves but does not completely normalize peripheral and hepatic insulin sensitivity in type 2 diabetic patients.

Abstract

INTRODUCTION. The aim of this study was to evaluate whether long-term administration of L-arginine acting through a normalization of NO/cyclic-guanosine- 3’,5’-cyclic monophosphate (cGMP) pathway was able to ameliorate peripheral and hepatic insulin sensitivity in 12 lean type 2 diabetic patients.
MATERIAL AND METHODS. A double-blind study was performed for 3 months. In the first month, patients were treated with their usual diet. Then they were randomly allocated into two groups. In group 1, patients were treated with diet plus placebo (orally three times per day) for 2 months. In group 2 patients were treated for 1 month with diet plus placebo (orally, three times per day) and then for 1 month with diet plus L-arginine (3 g three times per day). At the end of the first and the second month of therapy, patients underwent a euglycemic-hyperinsulinemic clamp combined with [6,6-2H2] glucose infusion. A total of 10 normal subjects underwent the same test as control subjects.
RESULTS. In group 1, no changes in basal cGMP levels, systolic blood pressure, forearm blood flow, glucose disposal, and endogenous glucose production were observed throughout. In group 2, L-arginine normalized basal cGMP levels and significantly increased forearm blood flow by 36% and glucose disposal during the clamp by 34%, whereas it decreased systolic blood pressure, and endogenous glucose production by 14 and 29%, respectively. However, compared with normal subjects, L-arginine treatment was not able to completely overcome the defect in glucose disposal.
CONCLUSIONS. L-arginine treatment significantly improves but does not completely normalize peripheral and hepatic insulin sensitivity in type 2 diabetic patients.
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Keywords

insulin sensitivity; diabetes; L-arginine

About this article
Title

Long-term oral L-arginine administration improves peripheral and hepatic insulin sensitivity in type 2 diabetic patients

Journal

Clinical Diabetology

Issue

Vol 3, No 2 (2002): Practical Diabetology

Pages

83-90

Published online

2002-05-13

Bibliographic record

Diabetologia Praktyczna 2002;3(2):83-90.

Keywords

insulin sensitivity
diabetes
L-arginine

Authors

PierMarco Piatti
Lucilla D. Monti
Gianpietro Valsecchi
Fulvio Magni
Emanuela Setola
Federica Marchesi
Marzia Galli-Kienle
Guido Pozza
K. George M.M. Alberti

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