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Hormonal Regulation

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.

Hormonal Regulation

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.

Regulation of Hormone Secretion

Regulation of Hormone Secretion

Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral stimuli,...

Gonadal and Placental Hormones

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...

Major Hormones and Their Functions

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.

Transducer Mechanism: Nuclear Receptors

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

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Related Experiment Video

Updated: May 30, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

Published on: August 13, 2019

[Estrogen, SERM].

Toshio Hayashi¹

¹Department of Geriatrics, Nagoya University Graduate School of Medicine

Nihon Rinsho. Japanese Journal of Clinical Medicine

|July 22, 2011

Summary

Selective estrogen receptor modulators (SERMs) like raloxifene offer protection against osteoporosis in postmenopausal women. Raloxifene effectively reduces vertebral fractures, providing a viable alternative for bone health management.

Area of Science:

Endocrinology
Bone Biology
Cardiovascular Health

Context:

Postmenopausal osteoporosis prevalence increases significantly after menopause.
Estrogen replacement therapy (ERT) historically offered protection against osteoporosis and improved endothelial function.
Recent trials on combined hormone replacement therapy (HRT) yield equivocal cardiovascular event prevention results.

Purpose:

To investigate the efficacy of selective estrogen receptor modulators (SERMs) as alternatives to HRT for osteoporosis and cardiovascular protection.
To evaluate the effect of raloxifene on postmenopausal elderly women with osteoporosis.

Summary:

Raloxifene, a second-generation SERM, is utilized for preventing and treating postmenopausal osteoporosis.
Studies indicate raloxifene decreases the incidence of vertebral fractures by 30-50% in postmenopausal women with osteoporosis.

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The study also examined raloxifene's effects in elderly postmenopausal women diagnosed with osteoporosis.

Impact:

Raloxifene demonstrates significant vertebral fracture risk reduction in postmenopausal women.
SERMs, such as raloxifene, present a promising alternative for managing osteoporosis and potentially cardiovascular health in postmenopausal women.
Findings support raloxifene's role in bone mineral density preservation and fracture prevention.