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Isolation of a post-binding inhibitor of insulin action from the sera of non-insulin-dependent diabetics.
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- Author(s): Dean B;Dean B; Hocking A; Harrison LC
- Source:
Diabetes research (Edinburgh, Scotland) [Diabetes Res] 1987 Jun; Vol. 5 (2), pp. 51-7.- Publication Type:
Journal Article- Language:
English - Source:
- Additional Information
- Source: Publisher: Teviot-Kimpton Publications Country of Publication: Scotland NLM ID: 8502339 Publication Model: Print Cited Medium: Print ISSN: 0265-5985 (Print) Linking ISSN: 02655985 NLM ISO Abbreviation: Diabetes Res Subsets: MEDLINE
- Publication Information: Publication: Edinburgh : Teviot-Kimpton Publications
Original Publication: Edinburgh ; New York : Teviot-Kimpton Publications, [1984- - Subject Terms: Insulin Resistance*; Diabetes Mellitus, Type 2/*blood ; Insulin Antagonists/*isolation & purification; Adipose Tissue/cytology ; Adipose Tissue/metabolism ; Adolescent ; Adult ; Aged ; Animals ; Child ; Diabetes Mellitus, Type 1/blood ; Female ; Glycated Hemoglobin/metabolism ; Humans ; In Vitro Techniques ; Male ; Middle Aged ; Oligopeptides/isolation & purification ; Rats
- Abstract: We have reported that sera from a majority of patients with non-insulin-dependent diabetes mellitus (NIDDM) inhibit insulin-stimulated lipogenesis (3-3H-glucose conversion to 3H-lipid) in rat adipocytes to a greater extent than control sera or sera from patients with insulin-dependent diabetes mellitus (IDDM). This effect was apparently due to a circulating, low molecular weight (Mr) substance soluble in acid/ethanol and resistant to proteases. We now describe the further characterization of this inhibitor isolated uniquely from NIDDM sera. Size exclusion chromatography of acid/ethanol extracts of sera on a Bio-Rad P2 column revealed the presence of a Mr 300-400 inhibitor of insulin-stimulated lipogenesis in 32 (70%) of 46 NIDDM sera but not in 9 IDDM or 12 control sera. NIDDM sera that contained the low Mr inhibitor had significantly elevated haemoglobin A1c levels compared with those without the inhibitor (14.1 +/- 2.6% vs 11.5 +/- 2.7%, p less than 0.001). In rat adipocytes, the low Mr inhibitor at a dilution equivalent to 1:40 unextracted serum, reduced maximal insulin-stimulated lipogenesis by 33%, 14C-6-glucose oxidation by 70% and 14C-1-glucose oxidation by 25%. In contrast, insulin-stimulated 2-deoxy-D-(1-3H) glucose uptake was unaffected. In the presence of the inhibitor, insulin sensitivity (insulin dose required for half-maximal response) was unchanged for lipogenesis but decreased for 14C-6-glucose oxidation and increased for 14C-1-glucose oxidation. In the presence of control sera, the low Mr inhibitor decreased basal lipogenesis (a measure of serum insulin-like activity) and its effect on insulin-stimulated lipogenesis was unaltered.(ABSTRACT TRUNCATED AT 250 WORDS)
- Accession Number: 0 (Glycated Hemoglobin A)
0 (Insulin Antagonists)
0 (Oligopeptides) - Publication Date: Date Created: 19870601 Date Completed: 19871117 Latest Revision: 20221207
- Publication Date: 20221208
- Accession Number: 3652616
- Source:
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