The Role of Growth Hormone-Releasing Hormone and the Hypothalamic-Pituitary-Somatotropic Axis in Aging: Potential
Ioannis Oikonomakos1, Richard Siow2,3, Stefan R Bornstein1,4
1Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
Abstract:
Aging is marked by a gradual decline in multiple physiological functions, increasing the risk of age-related disorders. Multiple factors have been identified as contributors to aging, many of which are regulated by the hypothalamus. Growth hormone-releasing hormone (GHRH) produced in the hypothalamus is a key regulator of growth hormone (GH) secretion. With aging, both GHRH and GH levels decline, leading to muscle loss, increased fat accumulation, metabolic dysregulation, and cognitive impairments. GH replacement therapy has been explored as a potential intervention to counteract these effects; however, its long-term use is associated with significant risks, including metabolic disturbances, cardiovascular complications, and potential cancer promotion. In contrast, studies suggest that GHRH-based therapies can improve body composition, muscle strength, cognitive function, and cardiovascular health while avoiding the risks linked to direct GH administration. Additionally, preclinical findings indicate that GHRH agonists may offer cardioprotective and immunomodulatory benefits. In this review, we summarize current knowledge on the roles of GHRH and GH in aging, highlight the limitations of GH-based therapies, and discuss the potential of GHRH-based approaches in mitigating age-related decline and improving health span.
Related Concept Videos
01:26Aging
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
01:27Major Hormones and Their Functions
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
01:19The Effect of Aging on Tissues
01:17Hormones and Bone Tissue
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
01:18Functions of Thyroid Hormones
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
01:29Bone Disorders
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...