The Relationships Among Serum Uric Acid, Plasma Insulin, and Serum Lipoprotein Levels in Subjects with Spinal Cord Injury

Abstract

Relationships were investigated among serum uric acid (UA), the insulin response to a standard oral glucose load (75 g), and serum lipoprotein levels in 197 individuals with chronic spinal cord injury (SCI). All subjects had normal liver and renal function. None had a prior history of diabetes mellitus or gout. The mean age of subjects was 50 +/- 1 years, duration of injury (DOI), 18 +/- 1 years, and body mass index (BMI), 25 +/- 0.4 kg/m2. No significant differences were found between those with paraplegia or quadriplegia for any of the parameters measured. The mean serum UA values were not significantly different among the subgroups of subjects with normal glucose tolerance, impaired glucose tolerance, or diabetes mellitus (5.6 +/- 0.2 mg/dl, 5.6 +/- 0.2 and 5.7 +/- 0.3, respectively). Approximately one-half of the subjects had an abnormality in oral glucose tolerance. The levels of serum UA (p < 0.001) and serum triglycerides (TG) (p < 0.01) in the subgroup with hyperinsulinemia were significantly higher than in the subgroup with normal insulin levels. By linear regression analyses, the serum UA concentration was positively correlated with peak plasma insulin level (r = 0.31, p < 0.001), and BMI (r = 0.20, p < 0.01), but not with age, DOI, or peak glucose. The data suggest that in subjects with chronic SCI, as in the healthy able-bodied population, hyperuricemia is associated with hyperinsulinemia, obesity and abnormal lipoprotein metabolism.