title: Urinary C-peptide as an index of unstable glycemic control in insulin-dependent diabetes mellitus (IDDM)
abstract: In order to investigate whether urinary C-peptide (UCP) excretion can be a useful index of insulin-dependent diabetes mellitus (IDDM) with unstable glycemic control, UCP was measured in nine IDDM patients with unstable glycemic control, nine IDDM patients with stable glycemic control, and 12 non-insulin-dependent diabetic (NIDDM) patients treated with insulin. The UCPs in overnight urine (U1) and fasting single void urine (U2) in IDDM patients with unstable glycemic control were significantly lower than those in IDDM patients with stable glycemic control (U1: 0.03 +/- 0.03 vs 0.24 +/- 0.20 nmol/mmol-Creatinine, U2: 0.02 +/- 0.01 vs 0.20 +/- 0.20 nmol/mmol-Cr, mean +/- SD, both P less than 0.01). The UCPs in U1 and U2 in both groups of IDDM were significantly lower than those in NIDDM (U1: 0.97 +/- 0.52, U2: 0.73 +/- 0.41 nmol/mmol-Cr, both P less than 0.01). The UCPs in U1 and U2 significantly correlated with incremental C-peptide response to intravenous glucagon injection and with glycemic stability assessed by the standard deviation of 10 previous fasting plasma glucose levels. These results suggest that UCP reflects their residual insulin secretory capacity and that UCP can be a useful index which distinguishes patients with unstable IDDM from those with stable diabetes mellitus.
authors.affiliation: Department of Geriatric Medicine, Osaka University Medical School, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Cha
authors.forename: Y
authors.initials: Y
authors.lastname: Tahara
authors.forename: H
authors.initials: H
authors.lastname: Ikegami
authors.forename: M
authors.initials: M
authors.lastname: Fukuda
authors.forename: H
authors.initials: H
authors.lastname: Yoneda
authors.forename: E
authors.initials: E
authors.lastname: Yamato
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Noma
authors.forename: K
authors.initials: K
authors.lastname: Shima
authors.forename: T
authors.initials: T
authors.lastname: Ogihara
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000652:urine; D001786:Blood Glucose / Q000378:metabolism*; D002096:C-Peptide / Q000652:urine*; D003922:Diabetes Mellitus, Type 1 / Q000188:drug therapy / Q000378:metabolism* / Q000652:urine; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism* / Q000652:urine; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007328:Insulin / Q000627:therapeutic use; D007332:Insulin Infusion Systems; D008875:Middle Aged
chemical_list: D015415:Biomarkers; D001786:Blood Glucose; D002096:C-Peptide; D006442:Glycated Hemoglobin; D007328:Insulin