Endocrine - Gonad Development

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Introduction

Female HPG axis

The term gonad refers to both the female ovary and the male testis, which have their own topic pages.

This section of notes refers only to the development of the gonad as an endocrine organ. A detailed description of the gonad development is covered in both Ovary Development and Testis Development.

Embryonically, initial endocrine development of the testis is required for development of both the internal genital tract and the external genitalia.

Postnatally, the gonads are part of an integrated Hypothalamus-Pituitary-Gonad (HPG) axis.


Endocrine Links: Introduction | BGD Lecture | Science Lecture | Lecture Movie | pineal | hypothalamus‎ | pituitary | thyroid | parathyroid | thymus | pancreas | adrenal | gonad‎ | endocrine placenta | other tissues | Stage 22 | endocrine abnormalities | Hormones | Category:Endocrine
Historic Embryology - Endocrine  
1903 Islets of Langerhans | 1904 interstitial Cells | 1908 Pancreas Different Species | 1908 Pituitary | 1908 Pituitary histology | 1911 Rathke's pouch | 1912 Suprarenal Bodies | 1914 Suprarenal Organs | 1915 Pharynx | 1916 Thyroid | 1918 Rabbit Hypophysis | 1920 Adrenal | 1935 Mammalian Hypophysis | 1926 Human Hypophysis | 1927 Hypophyseal fossa | 1932 Pineal Gland and Cysts | 1935 Hypophysis | 1937 Pineal | 1938 Parathyroid | 1940 Adrenal | 1941 Thyroid | 1950 Thyroid Parathyroid Thymus | 1957 Adrenal


Genital Links: genital | Lecture - Medicine | Lecture - Science | Lecture Movie | Medicine - Practical | primordial germ cell | meiosis | Female | X | ovary | oocyte | uterus | vagina | reproductive cycles | menstrual cycle | Male | Y | testis | spermatozoa | penis | prostate | Genital Movies | genital abnormalities | Assisted Reproductive Technology | puberty | Category:Genital
Historic Embryology - Genital 
1901 Urinogenital Tract | 1902 The Uro-Genital System | 1904 Ovary and Testis | 1904 Leydig Cells | 1904 Hymen | 1905 Testis vascular | 1909 Prostate | 1912 Prostate | 1912 Urinogenital Organ Development | 1914 External Genitalia | 1914 Female | 1915 Cowper’s and Bartholin’s Glands | 1920 Wolffian tubules | 1921 Urogenital Development | 1921 External Genital | 1927 Female Foetus 15 cm | 1932 Postnatal Ovary | 1935 Prepuce | 1935 Wolffian Duct | 1942 Sex Cords | 1943 Testes Descent | 1953 Germ Cells | Historic Embryology Papers | Historic Disclaimer

Some Recent Findings

  • Regulation of seminiferous tubule-associated stem Leydig cells in adult rat testes[1] "Testicular Leydig cells are the primary source of testosterone in males. Adult Leydig cells have been shown to arise from stem cells present in the neonatal testis. Once established, adult Leydig cells turn over only slowly during adult life, but when these cells are eliminated experimentally from the adult testis, new Leydig cells rapidly reappear. As in the neonatal testis, stem cells in the adult testis are presumed to be the source of the new Leydig cells. ... The proliferation of the stem Leydig cells was stimulated by paracrine factors including Desert hedgehog (DHH), basic fibroblast growth factor (FGF2), platelet-derived growth factor (PDGF), and activin. Suppression of proliferation occurred with transforming growth factor β (TGF-β). The differentiation of the stem cells was regulated positively by DHH, lithium- induced signaling, and activin, and negatively by TGF-β, PDGFBB, and FGF2. DHH functioned as a commitment factor, inducing the transition of stem cells to the progenitor stage and thus into the Leydig cell lineage."
  • Fetal Testosterone (FT) Influences Sexually Dimorphic Gray Matter in the Human Brain[2] "These results bridge a long-standing gap between human and nonhuman species by showing that fetal testosterone acts as an organizing mechanism for the development of regional sexual dimorphism in the human brain." Male Hormone Levels | Neural System Development
More recent papers  
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This table shows an automated computer PubMed search using the listed sub-heading term.

  • Therefore the list of references do not reflect any editorial selection of material based on content or relevance.
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Search term: Endocrine Gonad Development

M Bourdon, L Torres-Rovira, D Monniaux, C Faure, R Levy, A Tarrade, D Rousseau-Ralliard, P Chavatte-Palmer, G Jolivet Impact of a gestational exposure to diesel exhaust on offspring gonadal development: experimental study in the rabbit. J Dev Orig Health Dis: 2018;1-11 PubMed 29909796

C M Christante, M E Pinto-Fochi, A C Negrin, S R Taboga, R M Góes Effects of gestational exposure to di-n-butyl phthalate and mineral oil on testis development of the Mongolian gerbil. Reprod. Fertil. Dev.: 2018; PubMed 29898815

Lei Yin, Jianning Li, Yunhai Wei, Dejian Ma, Yamei Sun, Yanlai Sun Primary ovarian small cell carcinoma of pulmonary type with coexisting endometrial carcinoma in a breast cancer patient receiving tamoxifen: A case report and literature review. Medicine (Baltimore): 2018, 97(23);e10900 PubMed 29879027

Danielle N Meyer, Bridget B Baker, Tracie R Baker Ancestral TCDD exposure induces multigenerational histologic and transcriptomic alterations in gonads of male zebrafish. Toxicol. Sci.: 2018; PubMed 29788325

Gong Zhuandi, Che Tuanjie, Lai Luju, Ayimuguli Abdiryim, Deng Yingying, Liang Haoqin, Wei Suocheng, Ding Li FSH receptor binding inhibitor restrains follicular development and possibly attenuates carcinogenesis of ovarian cancer through down-regulating expression levels of FSHR and ERβ in normal ovarian tissues. Gene: 2018; PubMed 29783074


HPG Axis - Endocrinology - Simplified diagram of the actions of gonadotrophins

Gonad Development

Infant Ovary
  • mesoderm - mesothelium and underlying mesenchyme, primordial germ cells
  • Gonadal ridge - mesothelium thickening, medial mesonephros
  • Primordial Germ cells - yolk sac, to mesentery of hindgut, to genital ridge of developing kidney

Differentiation

  • testis-determining factor (TDF) from Y chromosome: presence (testes), absence (ovaries)

Testis

  • 8 Weeks, mesenchyme, interstitial cells (of Leydig) secrete testosterone, androstenedione
  • 8 to 12 Weeks - hCG stimulates testosterone production
  • Sustentacular cells - produce anti-mullerian hormone to puberty

Ovary

  • X chromosome genes regulate ovary development

Male Hormone Levels

Testicular Leydig cells (interstitial cells) are the main source of testosterone in males.

Male testosterone and AMH level graph.jpg

Human Male Testosterone and Anti-Müllerian Hormone (AMH) relative levels[3]

Leydig Cells

Leydig cells stained for LHCGR1.jpg

Leydig cells stained for LHCGR1[4]

Steroidogenesis

Steroidogenesis

Androgen and Digit ratio (2D:4D)

Androgen and Digit ratio (2D:4D

The ratio of 2nd and 4th finger (D, digit) length. This ratio has been suggested to relate to high fetal testosterone concentration (males have lower 2D:4D than females) and has been shown for several species.[5] Although a study in mice has not shown the same correlation.[6] There have been some suggestions that the ratio may also be an indicator of various neurological abnormalities.

To measure (2D:4D) - using your right hand palm up, measure the index finger (2) and ring finger (4) length from palm to tip. Dividing the index finger by the ring finger gives the 2D:4D ratio, average women ratio is 1, average men is 0.98.


Genital Links: genital | Lecture - Medicine | Lecture - Science | Lecture Movie | Medicine - Practical | primordial germ cell | meiosis | Female | X | ovary | oocyte | uterus | vagina | reproductive cycles | menstrual cycle | Male | Y | testis | spermatozoa | penis | prostate | Genital Movies | genital abnormalities | Assisted Reproductive Technology | puberty | Category:Genital
Historic Embryology - Genital 
1901 Urinogenital Tract | 1902 The Uro-Genital System | 1904 Ovary and Testis | 1904 Leydig Cells | 1904 Hymen | 1905 Testis vascular | 1909 Prostate | 1912 Prostate | 1912 Urinogenital Organ Development | 1914 External Genitalia | 1914 Female | 1915 Cowper’s and Bartholin’s Glands | 1920 Wolffian tubules | 1921 Urogenital Development | 1921 External Genital | 1927 Female Foetus 15 cm | 1932 Postnatal Ovary | 1935 Prepuce | 1935 Wolffian Duct | 1942 Sex Cords | 1943 Testes Descent | 1953 Germ Cells | Historic Embryology Papers | Historic Disclaimer

Adult Histology

References

  1. Li X, Wang Z, Jiang Z, Guo J, Zhang Y, Li C, Chung J, Folmer J, Liu J, Lian Q, Ge R, Zirkin BR & Chen H. (2016). Regulation of seminiferous tubule-associated stem Leydig cells in adult rat testes. Proc. Natl. Acad. Sci. U.S.A. , 113, 2666-71. PMID: 26929346 DOI.
  2. Lombardo MV, Ashwin E, Auyeung B, Chakrabarti B, Taylor K, Hackett G, Bullmore ET & Baron-Cohen S. (2012). Fetal testosterone influences sexually dimorphic gray matter in the human brain. J. Neurosci. , 32, 674-80. PMID: 22238103 DOI.
  3. Rey R. (2005). Anti-Müllerian hormone in disorders of sex determination and differentiation. Arq Bras Endocrinol Metabol , 49, 26-36. PMID: 16544032 DOI.
  4. Kossack N, Simoni M, Richter-Unruh A, Themmen AP & Gromoll J. (2008). Mutations in a novel, cryptic exon of the luteinizing hormone/chorionic gonadotropin receptor gene cause male pseudohermaphroditism. PLoS Med. , 5, e88. PMID: 18433292 DOI.
  5. McIntyre MH. (2006). The use of digit ratios as markers for perinatal androgen action. Reprod. Biol. Endocrinol. , 4, 10. PMID: 16504142 DOI.
  6. Yan RH, Bunning M, Wahlsten D & Hurd PL. (2009). Digit ratio (2Dratio4D) differences between 20 strains of inbred mice. PLoS ONE , 4, e5801. PMID: 19495421 DOI.


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Articles

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Cite this page: Hill, M.A. (2018, June 22) Embryology Endocrine - Gonad Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Endocrine_-_Gonad_Development

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