Gonadal Hormones
Gonadal Hormones - Related Videos
01:24
Gonadal and Placental Hormones
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2026
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...
10:43
Dissection of Larval Zebrafish Gonadal Tissue
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Cited by 6 •
2017
Here, we present a protocol for isolating gonadal tissue of larval zebrafish, which will facilitate investigations of zebrafish sex differentiation and maintenance.
02:59
C. elegans Gonad Extrusion: A Rapid Dissection Technique
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2023
This video describes a method to dissect gonads from adult C. elegans hermaphrodites, resulting in tissues that are suitable for immunostaining and fluorescent imaging.
03:59
Gonad Microinjection: A Method of Compound Delivery Directly into the Germline of C. elegans
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2023
This video describes microinjection, a common method of creating transgenic C. elegans strains. In the example, we will see microinjection used to introduce a ribonucleoprotein (RNP) complex for CRISPR-bases gene editing.
02:13
Types of Hormones
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2019
Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells. Steroid hormones are derived from cholesterol and are lipophilic in nature. This allows them to readily traverse the lipid-rich cell membrane to bind to their intracellular receptors in the cytoplasm or nucleus. Once bound, the cytoplasmic hormone-receptor complex translocates to the nucleus.
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The axis operates as a signaling sequence: hypothalamic signals stimulate pituitary gonadotropins, and these hormones act on the ovaries or testes to regulate steroid synthesis. The resulting gonadal hormones then provide feedback to the hypothalamus and pituitary. This arrangement links brain signaling with gonadal activity, allowing reproductive physiology to be studied as an interconnected regulatory system rather than as isolated organs.
Intracellular receptors allow estrogens, progesterone, and androgens to influence responsive tissues at the level of gene expression. After binding their receptors, these hormones alter which genetic instructions are activated or regulated. This mechanism helps explain why the same circulating hormone can produce effects in particular tissues and why gonadal hormones contribute to broad physiological changes beyond the gonads.
Feedback from gonadal hormones to the brain and pituitary connects hormone production with upstream control. As the gonads synthesize steroid hormones under pituitary stimulation, those products communicate back to the signaling centers that initiated the process. Examining this two-way communication helps researchers understand how reproductive function is coordinated across the hypothalamus, pituitary, and gonads.
Estrogens, progesterone, and androgens represent major gonadal steroid hormone groups that act through intracellular receptors and change gene expression in responsive tissues. Their effects are therefore interpreted through both hormone identity and tissue responsiveness. Comparing these groups helps biology researchers examine how reproductive function, sexual development, and broader physiological changes arise from related but distinct hormonal signals.
A useful conceptual sequence begins with hypothalamic signaling, continues through pituitary gonadotropin release, and follows the effects on ovarian or testicular steroid synthesis. Researchers can then examine feedback to the brain and pituitary and relate the signaling pattern to reproductive outcomes. This framework supports investigation of gamete production, menstrual and reproductive cycles, puberty, and pregnancy-related changes.
Gonadal hormones are particularly relevant when research addresses fertility, endocrine disorders, or hormone-based therapies. Their study also helps explain puberty, gamete production, menstrual and reproductive cycles, and pregnancy-related changes. By connecting hormone production, receptor-mediated gene regulation, and feedback control, this subject provides biological context for examining both normal physiology and altered reproductive function.