Chylomicronemia caused by an LPL gene mutation may be associated with a hyper-response of insulin secretion to glucose even in the absence of obesity.
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May link LPL-related chylomicronemia to hyperinsulinemic response without obesity; hypothesis-generating case report requiring confirmation.
A 39-year-old man with lipoprotein lipase (LPL) deficiency (height 177.7 cm, body weight 67 kg, and body mass index 21.2 kg/m2) showed severe hypertriglyceridemia (2,032 mg/dl). LPL activity and concentration were markedly low in postheparin plasma. LPL gene analysis revealed a homozygous mutation, Asp204 --> Glu in exon 5. Fasting plasma glucose (81 mg/dl) and insulin (2.7 microU/ml) levels were normal. Plasma glucose pattern during oral glucose (75 g) tolerance test was normal, however 30 minutes after glucose-loading the insulin secretion unexpectedly increased to 89.4 microU/ml. These data suggested that chylomicronemia might be related to a hyper-response of insulin secretion to glucose without obesity.
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Tanaka et al. (2002) studied this question.
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