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Open Access Research article

Impaired beta cell function is present in nondiabetic rheumatoid arthritis patients

Iván Ferraz-Amaro1*, Jose A García-Dopico2, Lilian Medina-Vega2, Miguel A González-Gay3 and Federico Díaz-González14

Author Affiliations

1 Division of Rheumatology, Hospital Universitario de Canarias, Ofra, s/n, La Laguna 38320, Santa Cruz de Tenerife, Spain

2 Servicio de Laboratorio, Hospital Universitario de Canarias, Ofra, s/n, La Laguna 38320, Santa Cruz de Tenerife, Spain

3 Division of Rheumatology, Hospital Universitario Marqués de Valdecilla, IFIMAV, Avenida Valdecilla, s/n, 39008 Santander, Cantabria, Spain

4 Departamento de Medicina, Facultad de Medicina, University of La Laguna, Ofra, s/n. La Laguna, 38320 Santa Cruz de Tenerife, Spain

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Arthritis Research & Therapy 2013, 15:R17  doi:10.1186/ar4149

Published: 22 January 2013

Abstract

Introduction

To investigate how markers of β-cell secretion (proinsulin-processing metabolites) are expressed in rheumatoid arthritis (RA) patients and their potential relation with the insulin resistance (IR) observed in these patients.

Methods

The 101 RA patients and 99 nondiabetic sex- and age-matched controls were included. IR by homeostatic model assessment (HOMA2), and β-cell secretion, as measured by insulin, split and intact proinsulin, and C-peptide levels were determined for both groups. Multiple regression analysis was performed to compare IR between groups and to explore the interrelations between RA features, proinsulin metabolites, and IR. Data were adjusted for glucocorticoids intake and for IR classic risk factors.

Results

Compared with controls, RA patients showed higher HOMA-IR (β coef., 0.40 (95% CI, 0.20 to 0.59); P = 0.00). When data were adjusted for glucocorticoids intake, noncorticosteroid patients maintained a higher IR index (β, 0.14 (0.05 to 0.24); P = 0.00). Impaired insulin processing in RA patients was detected by the onset of elevated split proinsulin levels (β, 0.70 pmol/L (0.38 to 1.02); P = 0.00). These data remained significant also when adjusted for prednisone intake (β, 0.19 (0.00 to 0.36) pmol/L; P = 0.04). Split proinsulin-to-C-peptide ratios were higher in RA patients undergoing corticosteroid therapy (β, 0.25 (0.12 to 0.38); P = 0.03) and were nearly significant in comparison between noncorticosteroids patients and controls (β, 0.16 (-0.02 to 0.34); P = 0.08). Interestingly, the impact of HOMA-IR on the ratio of intact proinsulin to C-peptide was higher in controls compared with patients (β, 6.23 (1.41 to 11.06) versus 0.43 (-0.86 to 1.71); P = 0.03).

Conclusions

β-Cell function is impaired in nondiabetic and in RA patients not taking corticoids by a mechanism that seems to be, at least in part, independent of IR.