Petra Sipilä
petra.sipila@utu.fi +358 29 450 4643 +358 50 477 3384 Kiinamyllynkatu 10 Turku |
Male fertility; epididymis; sperm maturation; androgen receptor; regulation of gene expression; rare diseases; cartilage-hair hypoplasia
Petra Sipilä completed her PhD at the Department of Biomedicine, University of Turku, Finland (2003) and continued for post-doctoral training first at Professor Andrew McMahon’s lab at Molecular and Cellular Biology, Harvard University and then as Finnish Academy Postdoctoral Researcher at the University of Turku. In 2007 she was appointed as Coordinator for GM unit at Turku Center for Disease Modeling (TCDM) and in 2012 as a director of GM unit at the Laboratory Animal Centre of University of Helsinki. Since spring 2015 she has been a principal investigator at the UTU Research Faculty of Medicine, University of Turku and Vice director of Turku Center for Disease modeling (TCDM) at the University of Turku.
Androgens are required for the male reproductive tissues. In addition, androgens regulate gene ex-pression in several non-reproductive tissues. Defects in androgen signaling are linked to diseases, such as prostate cancer. Androgens act through androgen receptor, AR, a hormone-inducible nuclear receptor. Upon ligand binding, AR is shuttled to the nucleus where it binds to the androgen response elements to regulate gene transcription. Specificity of spatiotemporal androgen regulation in different tissues is achieved by differential usage of coregulators. However, in many target tissues the regulation of cell type specific responses to androgen action remains poorly understood. Given the importance of androgen action, it is necessary to understand how androgen actions are normally regulated. We are especially interested in how tissue-specific androgen responses are mediated via AR SUMOylation, pioneer factors, collaborating transcription factors and microRNAs in the epididymis. Furthermore, we are interested in how those factors affect epididymal sperm maturation and thus male fertility.
We are also part of the FinnDisMice research consortium, that is committed to utilize CRISPR/Cas9 genome editing to generate disease models for several rare diseases of the Finnish disease heritage, which contains almost forty monogenic, rare hereditary diseases that are clearly enriched in Finland. The special phenotyping focus of our group is in cartilage-hair hypoplasia, a disease manifested by growth disorder and defective immune system.
- Analysis of Epididymal Protein Synthesis and Secretion (2018)
- Journal of Visualized Experiments
- Antiandrogens Reduce Intratumoral Androgen Concentrations and Induce Androgen Receptor Expression in Castration-Resistant Prostate Cancer Xenografts (2018)
- American Journal of Pathology
- Hydroxysteroid (17β) dehydrogenase 1 expressed by Sertoli cells contributes to steroid synthesis and is required for male fertility (2018)
- FASEB Journal
- Intratumoral androgen levels are linked to TMPRSS2-ERG fusion in prostate cancer (2018)
- Endocrine-Related Cancer
- Epididymal CYP2E1 plays a critical role in acrylamide-induced DNA damage in spermatozoa and paternally mediated embryonic resorptions (2017)
- Biology of Reproduction
- Genetic identification of thiosulfate sulfurtransferase as an adipocyte-expressed antidiabetic target in mice selected for leanness (2016)
- Nature Medicine
- Gremlin-1 Overexpression in Mouse Lung Reduces Silica-Induced Lymphocyte Recruitment - A Link to Idiopathic Pulmonary Fibrosis through Negative Correlation with CXCL10 Chemokine (2016)
- PLoS ONE
- Role of Dicer1-DependentFactors in the Paracrine Regulation of Epididymal Gene Expression (2016)
- PLoS ONE
- Role of Dicer1-Dependent Factors in the Paracrine Regulation of Epididymal Gene Expression (2016)
- PLoS ONE
- Segment-specific regulation of epididymal gene expression (2016)
- Reproduction
- Targeted inactivation of the mouse epididymal beta-defensin 41 alters sperm flagellar beat pattern and zona pellucida binding (2016)
- Molecular and Cellular Endocrinology
- Imbalanced lipid homeostasis in the conditional Dicer1 knockout mouse epididymis causes instability of the sperm membrane (2015)
- FASEB Journal
- The role of Dicer1 in the male reproductive tract (2015)
- Asian Journal of Andrology
- ErbB4, a receptor tyrosine kinase, coordinates organization of the seminiferous tubules in the developing testis. (2014)
- Molecular Endocrinology -Baltimore-
- Dicer1 Ablation in the Mouse Epididymis Causes Dedifferentiation of the Epithelium and Imbalance in Sex Steroid Signaling (2012)
- PLoS ONE
- Fibroblast Growth Factor 8b Causes Progressive Stromal and Epithelial Changes in the Epididymis and Degeneration of the Seminiferous Epithelium in the Testis of Transgenic Mice (2012)
- Biology of Reproduction
- Loss of Bmyc results in increased apoptosis associated with upregulation Myc expression in juvenile murine testis (2012)
- Reproduction
- Members of murine Pate family are predominantly expressed in the epididymis in a segmen-specific fashion and regulated by androgens and other testicular factors (2011)
- Reproductive Biology and Endocrinology
- Regional Expression of Androgen Receptor Coregulators and Androgen Action in the Mouse Epididymis (2011)
- Journal of Andrology