Abstract
Studies in postmenopausal women have identified sclerostin as a strong candidate for mediating estrogen effects on the skeleton. The effects of estradiol on sclerostin and Dickkopf-1 in younger women remain unclear. The main purpose of this study is to investigate the impact of estradiol and gonadotrophins fluctuations during the menstrual cycle on circulating sclerostin and Dickkopf-1 levels and the possible relationship of sclerostin and Dickkopf-1 with changes in N-terminal propeptide of type 1 collagen and C-telopeptide of collagen cross-links. Fourteen healthy premenopausal Caucasian women, with regular menses, aged 33.6 ± 4.5 years participated. After the first day of menstruation and every-other-day up to the next menses, fasting serum estradiol, luteinizing hormone, follicle-stimulating hormone, sclerostin, Dickkopf-1, N-terminal propeptide of type 1 collagen, and C-telopeptide of collagen cross-links levels were measured in peripheral blood. Participants completed dietary questionnaires and the International physical activity questionnaire during the cycle. Neither sclerostin nor Dickkopf-1 levels changed significantly across the menstrual cycle (p = 0.18 and p = 0.39, respectively), while N-terminal propeptide of type 1 collagen and C-telopeptide of collagen cross-links levels presented cyclic variation (p < 0.001 and p = 0.004, respectively). Baseline sclerostin (29.23 ± 10.62 pmol/L) positively correlated with N-terminal propeptide of type 1 collagen (r = 0.71, p < 0.01) and C-telopeptide of collagen cross-links (r = 0.63, p < 0.05), while Dickkopf-1 (4.82 ± 2.23 pmol/L) correlated positively with N-terminal propeptide of type 1 collagen (r = 0.56, p < 0.05). Mid-cycle E2 levels presented significant negative association with the percent decrease of C-telopeptide of collagen cross-links at all-time points during the luteal period (r = −0.60 to −0.68, p < 0.05–0.01). Circulating sclerostin and Dickkopf-1 levels do not change across the menstrual cycle and do not demonstrate any relationship with estradiol in premenopausal women. Further investigation is needed concerning the role of sclerostin and Dickkopf-1 on bone turnover in young estrogen-sufficient women.
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Abbreviations
- BMD:
-
bone mineral density
- CTX:
-
C-telopeptide of collagen cross-links
- DeltaCTX:
-
percent change of CTX
- Dkk-1:
-
Dickkopf-1
- E2:
-
estradiol
- ERα:
-
estrogen receptor-alpha
- FEI:
-
free estrogen index
- FP:
-
follicular phase
- FSH:
-
follicle-stimulating hormone
- IPAQ:
-
international physical activity questionnaire
- LH:
-
luteinizing hormone
- LP:
-
luteal phase
- LRP:
-
low density lipoprotein receptor-related protein
- MET:
-
metabolic equivalent of task
- P1NP:
-
N-terminal propeptide of type 1 collagen
- PTH:
-
parathyroid hormone
- RANKL:
-
receptor activator for nuclear factor-κB ligand
- SHBG:
-
sex hormone-binding globulin
- TSH:
-
thyroid-stimulating hormone
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Author contribution
Design and conduct of the study: Chrysoula G. Liakou, Julia D. Antoniou, George Mastorakos, Symeon Tournis. Biochemical analysis of the samples: Konstantinos Makris, Helen Marketos, Chrysoula G. Liakou, Dimitrios Rizos. Physical activity and dietary assessment: Ioannis G. Fatouros, Alexandra Avloniti. Data collection and analysis: Antonios Galanos, Chrysoula G. Liakou, George Mastorakos, Ioannis G. Fatouros, Alexandra Avloniti, Symeon, Tournis. Data interpretation: Chrysoula G. Liakou, George Mastorakos, Ioannis G. Fatouros, Konstantinos Makris, Symeon Tournis. Manuscript writing: Chrysoula G. Liakou, George Mastorakos, Ioannis G. Fatouros, Konstantinos Makris, Ismene Dontas, Symeon Tournis.
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Liakou, C.G., Mastorakos, G., Makris, K. et al. Changes of serum sclerostin and Dickkopf-1 levels during the menstrual cycle. A pilot study. Endocrine 54, 543–551 (2016). https://doi.org/10.1007/s12020-016-1056-9
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DOI: https://doi.org/10.1007/s12020-016-1056-9