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Photo: KG Pressfoto

Marju Orho-Melander

Professor

Photo: KG Pressfoto

Obesity/insulin resistance rather than liver fat increases coagulation factor activities and expression in humans

Author

  • Susanna Lallukka
  • Panu K. Luukkonen
  • You Zhou
  • Elina Isokuortti
  • Marja Leivonen
  • Anne Juuti
  • Antti Hakkarainen
  • Marju Orho-Melander
  • Nina Lundbom
  • Vesa M. Olkkonen
  • Riitta Lassila
  • Hannele Yki-Järvinen

Summary, in English

Increased liver fat may be caused by insulin resistance and adipose tissue inflammation or by the common I148M variant in PNPLA3 at rs738409, which lacks both of these features. We hypothesised that obesity/insulin resistance rather than liver fat increases circulating coagulation factor activities. We measured plasma prothrombin time (PT, Owren method), activated partial thromboplastin time (APTT), activities of several coagulation factors, VWF:RCo and fibrinogen, and D-dimer concentration in 92 subjects divided into groups based on insulin sensitivity [insulin-resistant (‘IR’) versus insulin-sensitive (‘IS’)] and PNPLA3 genotype (PNPLA3148MM/ MI vs PNPLA3148II). Liver fat content (1H-MRS) was similarly increased in ‘IR’ (13 ± 1%) and PNPLA3148MM/MI (12 ± 2%) as compared to ‘IS’ (6 ± 1%, p<0.05) and PNPLA3148II (8 ± 1%, p<0.05), respectively. FVIII, FIX, FXIII, fibrinogen and VWF:RCo activities were increased, and PT and APTT shortened in ‘IR’ versus ‘IS’, in contrast to these factors being similar between PNPLA3148MM/MI and PNPLA3148II groups. In subjects undergoing a liver biopsy and entirely lacking the I148M variant, insulin-resistant subjects had higher hepatic expression of F8, F9 and FGG than equally obese insulin-sensitive subjects. Expression of pro-inflammatory genes in adipose tissue correlated positively with PT (% of normal), circulating FVIII, FIX, FXI, VWR:RCo and fibrinogen, and expression of anti-inflammatory genes negatively with PT (%), FIX and fibrinogen. We conclude that obesity/insulin resistance rather than an increase in liver fat is associated with a procoagulant plasma profile. This reflects adipose tissue inflammation and increased hepatic production of coagulation factors and their susceptibility for activation.

Department/s

  • Diabetes - Cardiovascular Disease
  • EXODIAB: Excellence of Diabetes Research in Sweden
  • EpiHealth: Epidemiology for Health

Publishing year

2017

Language

English

Pages

286-294

Publication/Series

Thrombosis and Haemostasis

Volume

117

Issue

2

Document type

Journal article

Publisher

Schattauer GmbH

Topic

  • Endocrinology and Diabetes

Keywords

  • Adipose tissue
  • Fibrinogen
  • Inflammation
  • Insulin
  • Non-alcoholic fatty liver disease

Status

Published

Research group

  • Diabetes - Cardiovascular Disease

ISBN/ISSN/Other

  • ISSN: 0340-6245