H Rasekhi1, M Karandish1, M T Jalali2, M Mohammad-Shahi1, M Zarei3, A Saki4, H Shahbazian5. 1. Nutrition and Metabolic Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 2. Hyperlipidemia Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 3. Department of Food Hygiene, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. 4. Department of Biostatistics and Epidemiology, School of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 5. Health Research Institute, Diabetes Research Center, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Abstract
BACKGROUND/ OBJECTIVES: A relationship between osteocalcin (OC) levels and factors associated with energy metabolism and insulin resistance has been reported recently. The aim of this study was to investigate whether modulation of ostecalcin isoforms via vitamin K1 supplementation would affect glucose metabolism or insulin sensitivity in prediabetic and premenopause women. SUBJECTS/ METHODS:Eighty-two prediabetic women were randomized to consume vitamin K1 supplement (n = 39) or placebo (n = 43) for 4 weeks. Participants in the vitamin K1 supplement group received one pearl softgel capsule containing 1000 μm of phylloquinone, and the placebo group received one placebo capsule daily for 4 weeks. Blood samples were collected at baseline and after the 4-week intervention period to quantify carboxylated OC (cOC), undercarboxylated OC (ucOC) and relevant variables. RESULTS:Phylloquinone supplementation increased the serum levels of cOC and decreased ucOC, compared with placebo (12.53 ± 5.95 compared with 7.43 ± 4.85 ng/ml and 2.47 ± 1.91 compared with 4.79 ± 2.43 ng/ml, respectively; P < 0.001). Furthermore, intake of phylloquinone supplement led to significant decreases in %ucOC (17.97 ± 12.24 compared with 43.80 ± 19.86) and 2-h post-oral glucose tolerance test (OGTT) glucose (7.32 ± 1.50 compared with 8.62 ± 1.45 mmol/l), and 2-h post-OGTT insulin level (80.34 ± 42.24 compared with 112.43 ± 53.19 μIU/ml) and increased insulin sensitivity index (2.46 ± 0.71 compared with 1.75 ± 0.61) compared with placebo. Overall, a significant association was found between changes in %ucOC and changes in 2-h post-OGTT glucose (r = 0.308, P = 0.028). CONCLUSIONS: The results of this study demonstrated that vitamin K1 supplementation for 4 weeks did not affect insulin resistance in premenopausal and prediabetic women but had beneficial effects on glycemic status and insulin sensitivity.
RCT Entities:
BACKGROUND/ OBJECTIVES: A relationship between osteocalcin (OC) levels and factors associated with energy metabolism and insulin resistance has been reported recently. The aim of this study was to investigate whether modulation of ostecalcin isoforms via vitamin K1 supplementation would affect glucose metabolism or insulin sensitivity in prediabetic and premenopause women. SUBJECTS/ METHODS: Eighty-two prediabetic women were randomized to consume vitamin K1 supplement (n = 39) or placebo (n = 43) for 4 weeks. Participants in the vitamin K1 supplement group received one pearl softgel capsule containing 1000 μm of phylloquinone, and the placebo group received one placebo capsule daily for 4 weeks. Blood samples were collected at baseline and after the 4-week intervention period to quantify carboxylated OC (cOC), undercarboxylated OC (ucOC) and relevant variables. RESULTS:Phylloquinone supplementation increased the serum levels of cOC and decreased ucOC, compared with placebo (12.53 ± 5.95 compared with 7.43 ± 4.85 ng/ml and 2.47 ± 1.91 compared with 4.79 ± 2.43 ng/ml, respectively; P < 0.001). Furthermore, intake of phylloquinone supplement led to significant decreases in %ucOC (17.97 ± 12.24 compared with 43.80 ± 19.86) and 2-h post-oral glucose tolerance test (OGTT) glucose (7.32 ± 1.50 compared with 8.62 ± 1.45 mmol/l), and 2-h post-OGTT insulin level (80.34 ± 42.24 compared with 112.43 ± 53.19 μIU/ml) and increased insulin sensitivity index (2.46 ± 0.71 compared with 1.75 ± 0.61) compared with placebo. Overall, a significant association was found between changes in %ucOC and changes in 2-h post-OGTT glucose (r = 0.308, P = 0.028). CONCLUSIONS: The results of this study demonstrated that vitamin K1 supplementation for 4 weeks did not affect insulin resistance in premenopausal and prediabetic women but had beneficial effects on glycemic status and insulin sensitivity.
Authors: Norman K Pollock; Paul J Bernard; Barbara A Gower; Caren M Gundberg; Karl Wenger; Sudipta Misra; Reda W Bassali; Catherine L Davis Journal: J Clin Endocrinol Metab Date: 2011-04-20 Impact factor: 5.958
Authors: Ann V Schwartz; Anne L Schafer; Andrew Grey; Eric Vittinghoff; Lisa Palermo; Li-Yung L Lui; Robert B Wallace; Steven R Cummings; Dennis M Black; Douglas C Bauer; Ian R Reid Journal: J Bone Miner Res Date: 2013-06 Impact factor: 6.741
Authors: Jenny M Kindblom; Claes Ohlsson; Osten Ljunggren; Magnus K Karlsson; Asa Tivesten; Ulf Smith; Dan Mellström Journal: J Bone Miner Res Date: 2009-05 Impact factor: 6.741
Authors: Makiko Yoshida; Paul F Jacques; James B Meigs; Edward Saltzman; M Kyla Shea; Caren Gundberg; Bess Dawson-Hughes; Gerard Dallal; Sarah L Booth Journal: Diabetes Care Date: 2008-08-12 Impact factor: 19.112
Authors: Sabine R Zwakenberg; Sharon Remmelzwaal; Joline W J Beulens; Sarah L Booth; Stephen Burgess; Hassan S Dashti; Fumiaki Imamura; Edith J M Feskens; Yvonne T van der Schouw; Ivonne Sluijs Journal: Diabetes Date: 2018-10-23 Impact factor: 9.461