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- Colldén, Hannah, et al.
(författare)
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Dietary Progesterone Contributes to Intratissue Levels of Progesterone in Male Mice
- 2023
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Ingår i: Endocrinology. - 0013-7227 .- 1945-7170. ; 164:8
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Tidskriftsartikel (refereegranskat)abstract
- Progesterone serum levels have been identified as a potential predictor for treatment effect in men with advanced prostate cancer, which is an androgen-driven disease. Although progesterone is the most abundant sex steroid in orchiectomized (ORX) male mice, the origins of progesterone in males are unclear. To determine the origins of progesterone and androgens, we first determined the effect of ORX, adrenalectomy (ADX), or both (ORX + ADX) on progesterone levels in multiple male mouse tissues. As expected, intratissue androgen levels were mainly testicular derived. Interestingly, progesterone levels remained high after ORX and ORX + ADX with the highest levels in white adipose tissue and in the gastrointestinal tract. High progesterone levels were observed in mouse chow and exceptionally high progesterone levels were observed in food items such as dairy, eggs, and beef, all derived from female animals of reproductive age. To determine if orally ingested progesterone contributes to tissue levels of progesterone in males, we treated ORX + ADX and sham mice with isotope-labeled progesterone or vehicle by oral gavage. We observed a significant uptake of labeled progesterone in white adipose tissue and prostate, suggesting that dietary progesterone may contribute to tissue levels of progesterone. In conclusion, although adrenal-derived progesterone contributes to intratissue progesterone levels in males, nonadrenal progesterone sources also contribute. We propose that dietary progesterone is absorbed and contributes to intratissue progesterone levels in male mice. We speculate that food with high progesterone content could be a significant source of progesterone in males, possibly with consequences for men undergoing androgen deprivation therapy for prostate cancer.
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| 3. |
- Bengtsson Ryberg, Johanna, et al.
(författare)
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The Effects of Wind Power on Human Interests : A Synthesis
- 2013
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- PrefaceThere is a great need for knowledge concerning the impacts of wind power on humans, landscapes, the marine environment, birds, bats and other mammals.Previous studies of these environmental impacts have lacked an overall view of the effects. This has led to deficiencies in the processes surrounding the establishment of new wind farms. Vindval is a knowledge programme undertaken as a collaboration between the Swedish Energy Agency and the Swedish Environmental Protection Agency. Its aim is to gather and communicate scientific knowledge about the impacts of wind power on people and the natural environment. The programme continues until 2013.Vindval comprises some 30 individual research projects, together with four synthesis projects. Syntheses are prepared by experts, who compile and assess overall research results and experience regarding the effects of wind power in four different areas – humans, birds/bats, marine life and terrestrial mammals.The results of this research and synthesis work will provide a basis for environmental impact assessments and for the planning and permitting processes associated with wind power installations. Vindval requires high standards in the review and approval of research proposals, in order to ensure high-quality reports. The same high standards apply to the reporting, approval and publication of research results from the projects.This report was written by Johanna Bengtsson Ryberg, Gösta Bluhm, Karl Bolin, Bosse Bodén, Kristina Ek, Karin Hammarlund, Marianne Henningsson, Inga-Lena Hannukka, Carina Johansson, Sofia Jönsson, Sanna Mels, Tom Mels, Mats Nilsson, Erik Skärbäck, Patrik Söderholm, Åsa Waldo, Ingegärd Widerström, Niklas Åkerman.This report is a translation of the previous report in Swedish “Vindkraftens påverkan på människors intressen” (Naturvårdsverket report no 6497). Translated by Sofia Jönsson.The contents of the report are the responsibility of the authors.
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| 6. |
- Bernhard, Jonte, et al.
(författare)
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Practical Epistemic Cognition in a Design Project - Engineering Students Developing Epistemic Fluency
- 2019
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Ingår i: IEEE Transactions on Education. - : IEEE. - 0018-9359 .- 1557-9638. ; 62:3, s. 216-225
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Tidskriftsartikel (refereegranskat)abstract
- Contribution: This paper reports engineering students' practical epistemic cognition by studying their interactional work in situ. Studying "epistemologies in action'' the study breaks away from mainstream approaches that describe this in terms of beliefs or of stage theories.Background: In epistemology, knowledge is traditionally seen as "justified true belief'', neglecting knowledge related to action. Interest has increased in studying the epistemologies people use in situated action, and their development of epistemic fluency. How appropriate such approaches are in engineering and design education need further investigation.Research Questions: 1) How do students in the context of a design project use epistemic tools in their interactional work? and 2) What are the implications of the findings in terms of how students' cognitive and epistemological development could be conceptualized?Methodology: A collaborative group of six students were video recorded on the 14th day of a fifth-semester design project, as they were preparing for a formal critique session. The entire, almost 6 h, session was recorded by four video cameras mounted in the design studio, with an additional fifth body-mounted camera. The video data collected was analyzed using video ethnographic, conversation analysis, and embodied interaction analysis methods.Findings: The results show that the students use a wealth of bodily material resources as an integral and seamless part of their interactions as epistemic tools, in their joint production of understanding and imagining. The analysis also suggests that students' epistemological and cognitive development, individually and as a group, should be understood in terms of developing "epistemic fluency.''
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| 7. |
- Colldén, Hannah, et al.
(författare)
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Comprehensive Sex Steroid Profiling in Multiple Tissues Reveals Novel Insights in Sex Steroid Distribution in Male Mice
- 2022
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Ingår i: Endocrinology. - : The Endocrine Society. - 0013-7227 .- 1945-7170. ; 163:3
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Tidskriftsartikel (refereegranskat)abstract
- A comprehensive atlas of sex steroid distribution in multiple tissues is currently lacking, and how circulating and tissue sex steroid levels correlate remains unknown. Here, we adapted and validated a gas chromatography tandem mass spectrometry method for simultaneous measurement of testosterone (T), dihydrotestosterone (DHT), androstenedione, progesterone (Prog), estradiol, and estrone in mouse tissues. We then mapped the sex steroid pattern in 10 different endocrine, reproductive, and major body compartment tissues and serum of gonadal intact and orchiectomized (ORX) male mice. In gonadal intact males, high levels of DHT were observed in reproductive tissues, but also in white adipose tissue (WAT). A major part of the total body reservoir of androgens (T and DHT) and Prog was found in WAT. Serum levels of androgens and Prog were strongly correlated with corresponding levels in the brain while only modestly correlated with corresponding levels in WAT. After orchiectomy, the levels of the active androgens T and DHT decreased markedly while Prog levels in male reproductive tissues increased slightly. In ORX mice, Prog was by far the most abundant sex steroid, and, again, WAT constituted the major reservoir of Prog in the body. In conclusion, we present a comprehensive atlas of tissue and serum concentrations of sex hormones in male mice, revealing novel insights in sex steroid distribution. Brain sex steroid levels are well reflected by serum levels and WAT constitutes a large reservoir of sex steroids in male mice. In addition, Prog is the most abundant sex hormone in ORX mice.
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| 8. |
- Colldén, Hannah, et al.
(författare)
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Dehydroepiandrosterone Supplementation Results in Varying Tissue-specific Levels of Dihydrotestosterone in Male Mice
- 2022
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Ingår i: Endocrinology. - : The Endocrine Society. - 0013-7227 .- 1945-7170. ; 163:12
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Tidskriftsartikel (refereegranskat)abstract
- Dehydroepiandrosterone (DHEA), an adrenal androgen precursor, can be metabolized in target tissues into active sex steroids. It has been proposed that DHEA supplementation might result in restoration of physiological local sex steroid levels, but knowledge on the effect of DHEA treatment on local sex steroid levels in multiple tissues is lacking. To determine the effects of DHEA on tissue-specific levels of sex steroids, we treated orchiectomized (ORX) male mice with DHEA for 3 weeks and compared them with vehicle-treated ORX mice and gonadal intact mice. Intra-tissue levels of sex steroids were analyzed in reproductive organs (seminal vesicles, prostate, m. levator ani), major body compartments (white adipose tissue, skeletal muscle, and brain), adrenals, liver, and serum using a sensitive and validated gas chromatography-mass spectrometry method. DHEA treatment restored levels of both testosterone (T) and dihydrotestosterone (DHT) to approximately physiological levels in male reproductive organs. In contrast, this treatment did not increase DHT levels in skeletal muscle or brain. In the liver, DHEA treatment substantially increased levels of T (at least 4-fold) and DHT (+536%, P < 0.01) compared with vehicle-treated ORX mice. In conclusion, we provide a comprehensive map of the effect of DHEA treatment on intra-tissue sex steroid levels in ORX mice with a restoration of physiological levels of androgens in male reproductive organs while DHT levels were not restored in the skeletal muscle or brain. This, and the unexpected supraphysiological androgen levels in the liver, may be a cause for concern considering the uncontrolled use of DHEA.
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| 10. |
- Farman, Helen H., 1983, et al.
(författare)
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Membrane estrogen receptor alpha is essential for estrogen signaling in the male skeleton
- 2018
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Ingår i: Journal of Endocrinology. - : Bioscientifica. - 0022-0795 .- 1479-6805. ; 239:3, s. 303-312
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Tidskriftsartikel (refereegranskat)abstract
- The importance of estrogen receptor alpha (ER alpha) for the regulation of bone mass in males is well established. ERa mediates estrogenic effects both via nuclear and membraneinitiated ER alpha (mER alpha) signaling. The role of mERa signaling for the effects of estrogen on bone in male mice is unknown. To investigate the role of mERa signaling, we have used mice (Nuclear-Only-ER; NOER) with a point mutation (C451A), which results in inhibited trafficking of ER alpha to the plasma membrane. Gonadal-intact male NOER mice had a significantly decreased total body areal bone mineral density (aBMD) compared to WT littermates at 3, 6 and 9 months of age as measured by dual-energy X-ray absorptiometry (DEXA). High-resolution microcomputed tomography (mu CT) analysis of tibia in 3-month-old males demonstrated a decrease in cortical and trabecular thickness in NOER mice compared to WT littermates. As expected, estradiol (E2) treatment of orchidectomized (ORX) WT mice increased total body aBMD, trabecular BV/TV and cortical thickness in tibia compared to placebo treatment. E2 treatment increased these skeletal parameters also in ORX NOER mice. However, the estrogenic responses were significantly decreased in ORX NOER mice compared with ORX WT mice. In conclusion, mER alpha is essential for normal estrogen signaling in both trabecular and cortical bone in male mice. Increased knowledge of estrogen signaling mechanisms in the regulation of the male skeleton may aid in the development of new treatment options for male osteoporosis.
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