C-Peptide, Baseline and Postprandial Insulin Resistance after a Carbohydrate-Rich Test Meal - Evidence for an Increased Insulin Clearance in PCOS Patients?

Abstract:

:Introduction Known characteristics of patients with PCOS include infertility, menstrual disorders, hirsutism and also often insulin resistance. These symptoms increase with increasing body weight. In the LIPCOS study (Lifestyle Intervention for Patients with Polycystic Ovary Syndrome [PCOS]) long-term changes of the PCOS in dependence on pregnancy and parenthood were systematically assessed. In the framework of the LIPCOS study, PCOS patients were given a standardised carbohydrate-rich test meal in order to examine glucose homeostasis and insulin secretion. The results were compared with those of a eumenorrhoeic control group who all had corresponding BMI values and corresponding ages. Methods and Patients 41 PCOS patients (without diabetes) and 68 controls received a standardised carbohydrate-rich test meal (260 kcal, 62 % carbohydrates, 32 % fat, 6 % proteins) in order to generate a submaximal insulin and glucose stimulation. The values were determined at baseline and postprandial after 60, 120 and 180 minutes. In addition, the corresponding C-peptide levels were recorded. Results In the PCOS patients (n = 41), the insulin secretion test after a standardised test meal showed almost identical baseline and postprandial insulin levels when compared with those of the age- and BMI-matched eumenorrhoeic controls (n = 68). In the PCOS patients, the baseline and postprandial glucose levels were significantly elevated (92.88 ± 10.28 [PCOS] vs. 85.07 ± 9.42 mg/dL [controls]; p < 0.001) so was C-peptide (p < 0.025). Conclusions In the present study we have shown for the first time that, after consumption of a standardised test meal, PCOS patients formally exhibit a higher fasting insulin resistance than controls. In spite of the higher stimulated C-peptide levels, the insulin levels did not increase more strongly with increasing glucose levels than in controls which may be indicative of a higher insulin clearance in PCOS patients. :Einleitung Als bekannte Charakteristika von Patientinnen mit PCOS gelten Infertilität, Zyklusstörungen, Hirsutismus sowie auch häufig eine Insulinresistenz. Sie nimmt mit steigendem Körpergewicht zu. In der LIPCOS-Studie (Lebensstil-Intervention bei polyzystischem Ovarsyndrom [PCOS]) werden systematisch Langzeitveränderungen des PCOS in Abhängigkeit von Schwangerschaft und Elternschaft betrachtet. Im Rahmen der LIPCOS-Studie wurde PCOS-Patientinnen eine standardisierte kohlenhydratreiche Testmahlzeit verabreicht, um die Glukosehomöostase und die Insulinsekretion zu untersuchen. Die Ergebnisse wurden mit eumenorrhöischen Kontrollen verglichen, die jeweils einen entsprechenden BMI und ein entsprechendes Alter hatten. Methoden und Patientinnen 41 PCOS-Patientinnen (ohne Diabetes) und 68 Kontrollen bekamen eine standardisierte kohlenhydratreiche Testmahlzeit (260 kcal, 62 % Kohlenhydrate, 32 % Fett, 6 % Proteine) verabreicht, um eine submaximale Insulin- und Glukosestimulation zu erzeugen. Die Werte wurden basal, nach 60, 120 und 180 Minuten postprandial gemessen. Außerdem wurden jeweils die C-Peptid-Werte bestimmt. Ergebnisse Der Insulinsekretionstest nach standardisierter Testmahlzeit zeigte bei PCOS-Patientinnen (n = 41) nahezu gleiche basale und postprandiale Insulinwerte verglichen mit jeweils zu Alter und BMI entsprechenden eumenorrhöischen Kontrollen (n = 68). Die basalen und postprandialen Glukosespiegel waren bei PCOS-Patientinnen signifikant erhöht (92,88 ± 10,28 [PCOS] vs. 85,07 ± 9,42 mg/dl [Kontrollen]; p < 0,001), ebenso die C-Peptid-Werte (p < 0,025). Schlussfolgerung In der vorliegenden Arbeit konnte erstmals gezeigt werden, dass Patientinnen mit PCOS unter Gabe einer standardisierten Testmahlzeit eine formal größere Nüchtern-Insulinresistenz als Kontrollen hatten. Trotz höher stimulierter C-Peptid-Werte stiegen die Insulinwerte mit erhöhten Glukosewerten bei PCOS-Patientinnen nicht stärker an als bei Kontrollen, was auf eine erhöhte Insulinclearance bei PCOS hindeuten könnte.

authors

Stassek J,Erdmann J,Ohnolz F,Berg FD,Kiechle M,Seifert-Klauss V

doi

10.1055/s-0042-119199

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

59-65

issue

1

eissn

0016-5751

issn

1438-8804

journal_volume

77

pub_type

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