Piltonen Terhi

Reproductive and metabolic health in women with polycystic ovary syndrome (PCOS) – a translational research approach to the most common endocrinological disorder of women

 

 Research unit: PEDEGO

 

Group leader

Terhi T. Piltonen, M.D, Associate Professor is a clinical researcher for the Academy of Finland and senior consultant in the Department of Obstetrics and Gynecology, Reproductive Endocrinology and IVF Unit, Medical Research Centre, University of Oulu, Finland. After post-doctoral training at the UCSF (University of California, San Francisco) she has been pursuing her career as principal investigator focusing on life-long health burden related to polycystic ovary syndrome (PCOS).

 

What do we do

Polycystic ovary syndrome (PCOS) affects 10-18% of fertile aged women and it is characterized by hyperandrogenism and chronic oligo-anovulation. Up to 50-70% of women with PCOS are obese and the women present with metabolic derangements. Interestingly, some women will not present the clinical, diagnostic features (oligo-anovulation, hyperandrogenism) until gaining weight, thus the syndrome is tightly linked with obesity. Due to anovulation, some women have difficulties to achieve spontaneous pregnancy and most of the diagnosis are set in the infertility clinics. However, especially the obese women with PCOS would benefit life style counselling, glucose metabolism testing and antiandrogenic treatments for excessive body hair even outside fertility context. Considering that the syndrome has been shown to associate with several co-morbidities (type 2 diabetes, hypertension, dyslipidemia, stroke, pregnancy complications, and endometrial cancer) and psychosocial burden (anxiety, depression, eating disorders), correct, timely diagnosis, early support and common guidelines are warranted.

The heritability of the syndrome has been estimated to be as strong as 70 % but genetic factors explain less than 10 % of the cases. To date it is thought that the syndrome stems from androgen exposure during fetal life. Anti-Müllerian hormone (AMH) is expressed from growing antral follicles and its levels correlate well with antral follicle counts, thus reflecting the size of the follicle reserve. Women with PCOS have 2-3 times higher levels of AMH compared to other women. In mice high AMH can increase gonadotrophin releasing hormone (GnRH) pulsatility in brain, leading to increased luteinizing hormone (LH) pulsatility and hormonal imbalance, features often detected in women with PCOS also. In addition, a recent publication revealed that high AMH exposure in mice during pregnancy induced a PCOS-like phenotype in the female offspring later in life. We have shown that women with PCOS have higher AMH-levels even at the end of their pregnancies and we intend to study how high AMH levels affect the placenta and fetus, and whether women with PCOS, who have high AMH levels, have an increased risk for pregnancy complications.

The inner epithelial lining of the uterus, called endometrium, is a hormone responsive tissue which grows and sheds in response to fluctuating levels of ovarian-derived steroid hormones. Endometrium lining consists of simple columnar epithelium that is in tight connection with underlying stromal cells, enabling complex interaction between these two cell compartments. Resident and migrating immune cells are also important for the function of the endometrium. Interestingly, perivascular stem cell populations have also been identified in human endometrium possibly contributing in the monthly renewal of the endometrial lining. Women with PCOS have been show to present with an altered endometrial function related to steroid hormone action and/or metabolism possibly contributing to infertility/subfertility as well as to endometrial cancer risk in women with PCOS.

Hormonal contraceptives, commonly used in treating women with PCOS and endometriosis but also many other gynaecological conditions, have crucial role in female hormone therapy. Besides well documented benefits, recent studies have indicated impairment in metabolic parameters (glucose and lipid metabolism and low grade inflammation) in women with no previous risk factors.Whether some estrogen/progestin combinations are metabolically more beneficial and should thus be recommended to women with pre-existing unfavourable metabolic profile is not well established.

Main focuses of the research team are:

  • To investigate the role of steroid hormones (hyperandrogenism or hypoestrogenism) on long-term metabolic and reproductive health in women, especially in women with PCOS
  • Unravel the role of AMH in PCOS pathogenesis, especially the effects of AMH levels during pregnancy
  • To reveal mechanisms/pathways responsible for the altered endometrial function of women with PCOS
  • To assess the inflammatory and metabolic effects of hormonal contraceptives
  • To elucidate the role of inflammation, hypoxia and metabolism-related factors in endometrial regeneration and health - outcomes related to implantation and endometrial cancer
  • To assess the role of gynaecological hormone-related disorders (PCOS and endometriosis) on mental distress, quality of life, life style factors and co-morbidity
  • To develop means and tools to increase awareness of female health and develop treatment guidelines

Materials and methods and facilities

The epidemiological studies mostly base on both 1966 and 1986 Northern Finland Birth Cohorts (http://www.oulu.fi/nfbc/node/44315). The team has several ongoing clinical trials related to contraceptive use, endometrial function and metabolic health in women with PCOS. The molecular biology laboratory, cell culture facilities and the endometrial tissue bank are situated in the Clinical Research Center in Kieppi-building whereas all patient visits take place in in the Reproduction Unit at the hospital side.

 

Our team

Post doc researchers

  • Arffman Riikka, PhD

PhD students

  • Kangasniemi Marika, MD
  • Karjula Salla, MD
  • Khatun Masuma, M.Sc
  • Koivuaho Emilia, B.M.
  • Kujanpää Linda, B.M.
  • Nurkkala Mona-Marika, MD
  • Nurmenniemi Julius, Student of Medicine
  • Ollila Meri-Maija, MD
  • Rossi Henna-Riikka, MD
  • Ruokojärvi Maria, B.M.
  • Sundelin Fia, B.M.
  • Vuontisjärvi Saara, MD

Other staff

  • Huikari Elina, Research nurse

 

Where are we headed

Improve long-term health and wellbeing of women with PCOS and increase PCOS awareness.

 

Our main collaborators

ReproEndo-Team

  • Juha Tapanainen, Professor, Department of Obstetrics and Gynecology, University of Helsinki
  • Laure Morin-Papunen, Associate Professor, Department of Obstetrics and Gynecology, University of Oulu
  • Hannu Martikainen, Professor, Department of Obstetrics and Gynecology, University of Oulu
  • Maarit Niinimäki, MD, PhD, Department of Obstetrics and Gynecology, University of Oulu

The Nordic PCOS Network

  • Marianne Anderssen, Professor, Odense University Hospital, Denmark
  • Dorte Glintborg, Associate Professor, Odense University Hospital, Denmark
  • Francisco Gomez Real, University of Bergen, Norway
  • Helle Karro, MD, PhD., University of Tartu, Estonia
  • Angelica Linden-Hirschberg Professor, Karolinska Institute, Sweden
  • Pernille Ravn, MD., PhD, Odense University Hospital, Denmark
  • Inger Sundström-Poromaa, Professor, University of Uppsala, Sweden
  • Elisabet Stener-Victorin, Associate Professor, Karolinska Institute, Sweden
  • Eszter Vanky, Professor, University of Trondheim, Norway

PCOS-Awareness Alliance

  • Helena Teede, Professor, School of Public Health and Preventive Medicine, Monash University, Australia
  • Robert Norman, Professor, University of Adelade, Australia
  • Steven Franks, Professor, Imperial College, London
  • Anuja Dokras, Professor, University of Pennsylvania, USA
  • Joop Laven, Professor, Erasmus MC, University of Rotterdam, Netherlands
Other Collaborators
  • Paolo Giacobini, PhD, French National Institute of Health and Medical Research (INSERM, tenured position), Jean-Pierre Aubert Research Center, Lille, France
  • Linda C. Giudice, MD, PhD, Professor and Chair Department of Obstetrics, Gynecology & Reproductive Sciences, UCSF, San Francisco, California, USA
  • Andres Salumets, PhD, Professor, Professor of Reproductive Medicine, Senior Research Fellow in Genetics, Department of Obstetrics and Gynecology, University of Tartu, Estonia
  • Kaarel Krjutškov, PhD, Head of Genomic Service Laboratory; Senior Researcher, Competence Center on Health Technologies, Estonia
  • Oskari Heikinheimo, Professor, Department of Obstetrics and Gynecology, University of Helsinki
  • Leif Andersson, Emeritus Professor, Department of Pathology, University of Helsinki
  • Ralf Butzow, Professor, Department of Pathology, University of Helsinki
  • Sirkka-Keinänen-Kiukaanniemi, Professor, Northern Finland Birth Cohort Studies and Center for Life Course Health Research, University of Oulu
  • Marjo-Riitta Järvelin, Professor, Institute of Health Sciences, University of Oulu
  • Sylvain Sebert, PhD., Institute of Health sciences, University of Oulu
  • Ulla Puistola, Professor, Department of Obstetrics and Gynecology, University of Oulu
  • Heikki Huikuri, Professor, Department of Internal Medicine /Cardiology, University of Oulu
  • Tuula Salo, Professor, Department of Dentistry, Oral pathology, University of Oulu
  • Petri Lehenkari, Professor, Department of Molecular Biology and Anatomy, University of Oulu
  • Annikki Liakka, MD, PhD, Department of Pathology, University of Oulu
  • Mikko Hallman, Professor (Emeritus), Department of Paediatrics, University of Oulu
  • Mika Rämet, Professor, Department of Paediatrics, University of Oulu
  • Marja Vääräsmäki, MD, PhD, Department of Obstetrics and Gynecology, University of Oulu
  • Marja Ojaniemi, Associate Professor, Department of Paediatrics, University of Oulu
  • Outi Uimari, MD, PhD., Department of Obstetrics and Gynecology, University of Oulu
  • Jaana Nevalainen, MD, Department of Obstetrics and Gynecology, University of Oulu

 

How to find us

Department of Obstetrics and Gynecology
PEDEGO Research Unit
Medical Research Center Oulu
Oulu University Hospital
University of Oulu, FINLAND
terhi.piltonen[at]oulu.fi

 

Last updated: 5.12.2018