menopause – NIH Director's Blog (original) (raw)
Maternal Brain Hormone Key to Strengthening Bones Could Help Treat Osteoporosis, Bone Fractures
Posted on August 1st, 2024 by Dr. Monica M. Bertagnolli
Credit: Donny Bliss/NIH
More than 200 million people around the world have osteoporosis, a condition that weakens bones to the point that they break easily. Women are at especially high risk after menopause due to declining levels of the hormone estrogen, which helps keep bones strong. While osteoporosis rarely has noticeable symptoms, it can lead to serious injuries when otherwise minor slips and falls cause broken bones that in turn can lead to further fracture risk and fracture-related mortality. So, I’m pleased to share NIH-supported research suggesting a surprising candidate for strengthening bones: a maternal hormone produced in the brain.
The study in mice reported in Nature shows that this newly discovered hormone maintains and rebuilds bone strength in lactating females, even as estrogen levels dip and calcium is lost to the demands of milk production. 1 The findings suggest this hormone—or a drug that acts similarly—could be key to treating osteoporosis and preventing and healing broken bones.
The findings come from a team led by Holly Ingraham, University of California, San Francisco. The researchers knew from studies in mice and humans that a protein related to parathyroid hormone, which is made in the mammary glands, is the main driver for stripping calcium from maternal bones for milk production. As a result of this process, nursing mothers tend to lose a lot of bone. In humans, this bone loss is 10% on average, compared to nearly 30% in mice. Fortunately, these losses are reversed after lactation ends, suggesting to the researchers there must be some other bone-strengthening factor in play.
Previous work in Ingraham’s lab, also supported by NIH, offered other clues. The researchers found that in female mice, blocking a certain estrogen receptor in select neurons in a small area of the brain led to the development of bones that were exceptionally dense and strong. 2 This was an early hint that an unidentified hormone might have a role. The team’s search in this latest study led them to brain-derived communication network factor 3 (CCN3).
The new findings showed that, in lactating female mice, CCN3 is produced in the same brain area identified in the previous study. When the researchers prevented the brain from making CCN3, lactating female mice rapidly lost bone. The researchers also found that male and female young adult and older mice gained a considerable amount of bone mass and strength when their levels of circulating CCN3 were boosted over a two-week period. In fact, in some female mice that were very old or completely lacked estrogen, the hormone more than doubled their bone mass. Tests showed that the animals’ bones weren’t just denser, but also stronger.
Further studies conducted by co-author Thomas Ambrosi, University of California, Davis, revealed that bone stem cells were responsible for receiving signals and generating the new bone. When those cells were exposed to CCN3, they ramped up bone production even more. When the researchers applied a hydrogel patch containing CCN3 to the sites of bone breaks, this spurred the formation of new bone. As a result, the researchers saw rapid bone healing in older mice comparable to what would be expected in much younger mice.
In future studies, the researchers want to gain insight into the underlying mechanisms of CCN3. They also plan to explore the hormone’s potential for treating bone loss in people at increased risk, including postmenopausal women, breast cancer survivors taking estrogen blockers, and those with other conditions leading to unhealthy bone mass, such as genetic bone disorders, chronic kidney disease, or premature ovarian failure. They suggest that more immediate local uses for CCN3 include fracture repair, cartilage regeneration, and bone improvements for anchoring dental implants. It’s a great example of how finding an answer to a scientific puzzle—like how maternal bones stay strong during breastfeeding—can potentially lead to advances that help many more people.
References:
[1] Babey ME, et al. A maternal brain hormone that builds bone. Nature. DOI: 10.1038/s41586-024-07634-3 (2024).
[2] Herber CB, et al. Estrogen signaling in arcuate Kiss1 neurons suppresses a sex-dependent female circuit promoting dense strong bones. Nature Communications. DOI: 10.1038/s41467-018-08046-4 (2019).
NIH Support: National Institute of Diabetes and Digestive and Kidney Diseases, National Institute on Aging, National Institute of General Medical Sciences, National Institute of Arthritis and Musculoskeletal and Skin Diseases
Posted In: Health, Science, Uncategorized
Tags: aging, basic research, Bone, bone fracture, breastfeeding, calcium, estrogen, hormone, maternal health, menopause, osteoporosis
Expanding Menopause Research to Advance the Health of All Women
Posted on May 15th, 2023 by Janine Austin Clayton, M.D., FARVO, NIH Office of Research on Women’s Health
Since 2017, NIH’s Office of Research on Women’s Health (ORWH) has hosted the Vivian W. Pinn Symposium during National Women’s Health Week (NWHW) in May. This event honors the first full-time director of the office, Dr. Vivian W. Pinn, and serves as a critical forum for experts across sectors to communicate and collaborate for the advancement of women’s health.
This week marks the beginning of the 2023 NWHW, and on May 16, ORWH will host the 7th Annual Vivian W. Pinn Symposium. It’s titled: Menopause and Optimizing Midlife Health of Women.
Topics to be discussed include: the menopausal transition (also known as perimenopause), the accumulation of morbidity after menopause, menopause in special populations, the influence of social determinants of health on the experience of menopause, the use of menopausal hormone therapy (MHT), and interventions to promote healthy aging.
This year, JoAnn Manson, Harvard Medical School, Cambridge, MA, will deliver the keynote speech, titled “Menopausal Hormone Therapy: 30 Years of Lessons from the Women’s Health Initiative.” I encourage everyone with an interest in women’s health to register for the event.
In 1992, NIH’s National Heart, Lung, and Blood Institute launched the Women’s Health Initiative (WHI), seeking to improve the health of women through research on prevention of serious health conditions in postmenopausal women. Over three decades later, WHI remains an extraordinary example of centering research around the health needs of women, and WHI research results “definitively established that menopausal hormone therapy should not be used to prevent heart disease, stroke, and other chronic diseases.” These results were practice-changing and led to a dramatic decline in the use of MHT.
Menopause is a natural and irreversible life course stage marked by the cessation of menstrual cycling for 12 consecutive months. Common symptoms associated with menopause include hot flashes, sleep disturbances, mood changes, headaches, and heart palpitations. An article, co-authored by Dr. Manson, summarizes effective hormonal and non-hormonal treatments to manage menopausal symptoms [1].
The WHI’s longer-term follow-up of the treatment of these women, however, has demonstrated many nuanced findings [2]. For example, MHT’s risks and benefits are complex and vary based upon patient-level characteristics, including the age at which the therapy is initiated and the formulation of the MHT prescribed. Importantly, WHI was designed to assess the efficacy of MHT in preventing chronic disease, not to assess the efficacy or safety of MHT when used to treat menopausal symptoms. The average study participant was older, with over a decade since the start of their menopausal transition.
When considering any treatment, people should consult a health care professional, and MHT may be an option for some women, especially those who are experiencing menopausal symptoms and are at low risk for adverse events. The Food and Drug Administration (FDA) offers a fact sheet to answer questions and provide guidance about menopause and hormones, and has evaluated the risks and benefits of MHT for specific age groups of women [3].
In addition to WHI, there are two other valuable NIH-funded studies helping to make progress in our understanding of the health of midlife and older women:
• Study of Women’s Health Across the Nation (SWAN)
• Menopause Strategies: Finding Lasting Answers for Symptoms and Health (MsFLASH)
A major health concern for women during perimenopause, menopause, and post menopause is cardiovascular health. More research is needed to understand how different stages of menopause affect women’s cardiovascular health and how different doses and formulations of MHT may affect risk.
Among the many speakers at the Vivian W. Pinn Symposium will be Wendy Kohrt, a co-author on a recent comprehensive review of cardiovascular health and menopause [4]. She is director of the University of Colorado Specialized Centers of Research Excellence on Sex Differences (SCORE), Aurora. Also, a recent issue of ORWH’s Women’s Health in Focus at NIH discussed current NIH-funded research on menopause, resources, future menopause-related research, and more.
In response to a Congressional request to address NIH efforts related to women’s health research, ORWH hosted, along with the NIH Advisory Committee on Research on Women’s Health, “Advancing NIH Research on the Health of Women: A 2021 Conference.” The importance of menopause research as it relates to chronic debilitating conditions, which pose a significant burden on the health of women, was addressed during the conference, and the full report is available on the ORWH website.
Further, ORWH and partnering institutes released two notices of funding opportunities titled Understanding Chronic Conditions Understudied Among Women (R01 and R21), and ORWH sponsored the forthcoming Framework for the Consideration of Chronic Debilitating Conditions in Women from the National Academies of Sciences, Engineering, and Medicine.
I wish everyone a happy and healthy NWHW and look forward to gathering virtually for the 7th Annual Vivian W. Pinn Symposium. For more information and resources on menopause, visit the FDA’s Office of Women’s Health and NIH’s National Institute on Aging (NIA) websites. Also, My Menoplan, developed by NIA-funded researchers, offers information and personalized tools to help plan for perimenopause and menopause. Please stay connected to ORWH by visiting our website for updates; signing up for our monthly newsletter, The Pulse; liking us on Facebook; and following ORWH on Twitter.
References:
[1] Management of menopausal symptoms: A review. Crandall CJ, et al. JAMA. 2023 February 7: 329(5):405-420.
[2] Menopausal hormone therapy and health outcomes during the intervention and extended poststopping phases of the Women’s Health Initiative randomized trials. Manson JE, et al. JAMA. 2013 October 2: 310(13)1353-1368.
Links:
Office of Research on Women’s Health (NIH)
7th Annual Vivian W. Pinn Symposium (ORWH)
Specialized Centers of Research Excellence on Sex Differences (SCORE) (ORWH)
National Women’s Health Week (Office on Women’s Health, U.S. Department of Health and Human Services, Rockville, MD)
Women’s Health Initiative (WHI)
Study of Women’s Health Across the Nation (SWAN)
Menopause Strategies: Finding Lasting Answers for Symptoms and Health (MsFLASH) (Fred Hutchinson Cancer Center, Seattle)
Office of Women’s Health (U.S. Food and Drug Administration, Silver Spring, MD)
Note: Dr. Lawrence Tabak, who performs the duties of the NIH Director, has asked the heads of NIH’s Institutes, Centers, and Offices to contribute occasional guest posts to the blog to highlight some of the interesting science that they support and conduct. This is the 30th in the series of NIH guest posts that will run until a new permanent NIH director is in place.
Posted In: Generic
Tags: FDA, JoAnn Manson, menopausal hormone therapy, menopause, MHT, MsFLASH, National Women's Health Week, NIH Advisory Committee on Research on Women's Health, NWHW, ORWH, perimenopause, post menopause, SWAN, Vivian Pinn, Wendy Kohrt, WHI, women, Women's Health Initiative, women's health