Integumentary System - Mammary Gland Development

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Introduction

Adult female mammary anatomy cartoon

The mammary gland is the functional structure of the female breast and develops initially as an ectodermal skin specialization. Breast growth and appearance in male and female children are virtually identical prior to puberty.


Postnatally at puberty, female mammary glands under the influence of mainly sex hormone signaling, undergo a series of growth changes that can be defined anatomically by a series of "Tanner Stages". The bilayered mammary epithelium initially forms ducts that extend and branch.


In pregnancy, an additional series of signals leads to further changes in breast structure, differentiating into milk-producing alveoli. The key function of this process is to prepare the maternal breast for lactation and providing nutrition through milk to the newborn. The components of milk produced also changes beginning with an initial colostrum around birth. (More? milk)


Molecular signals identified as involved in this process include multiple Wnt ligands and β-catenin’s transcriptional activity for developmental processes and also for mammary stem cell self renewal.


At menopause, changes in sex hormone secretion can once again alter breast structure.


The breast also associated with oncogenesis (breast cancer). Research in this area has been aided by the discovery in 1994 of the two breast cancer susceptibility genes (BRCA1, BRCA2). There is some developing evidence that modification of stem cells (progenitor cells) that exist in the mammary gland may also contribute to neoplasms (cancer).


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Additional Links: milk | Category:Mammary Gland

Historic Mammary Papers  
1882 Mammary Gland | 1921 Mammary Glands |1942 Smoking and lactation | 1950 Mammary Gland
Historic Disclaimer - information about historic embryology pages 
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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Some Recent Findings

  • The Activin Social Network: Activin, Inhibin and Follistatin in Breast Development and Cancer

Endocrinology[1] "Activins and inhibins are closely related protein heterodimers with similar tissue distribution, yet these two complexes have opposing functions in development and disease. Both are secreted cytokine hormones, with activin being the primary inducer of downstream signaling cascades and inhibin acting as a rheostat that exquisitely governs activin function. Adding to the complexity of activin signaling, follistatin, a high glycosylated monomeric protein, binds activin with high affinity, also restraining downstream pathway activation but through a mechanism distinct from that of inhibin. These three proteins were first identified as key ovarian hormones in the pituitary-gonadal axis that direct synthesis and secretion of follicle-stimulating hormone from the pituitary, hence controlling folliculogenesis. Research over the last thirty years has expanded the roles of these proteins, first by discovering the ubiquitous expression of the trio and then implicating them in a wide array of biological functions. In concert, these three hormones govern tissue development, homeostasis, and disease in multiple organ systems through diverse autocrine and paracrine mechanisms. Herein, we review the actions of activin and its biological inhibitors, inhibin and follistatin, in mammary gland morphogenesis and cancer."

  • Varying Susceptibility of the Female Mammary Gland to In Utero Windows of BPA Exposure[2] "In utero exposure to the endocrine disrupting compound bisphenol A (BPA) is known to disrupt mammary gland development and increase tumor susceptibility in rodents. It is unclear whether different periods of in utero development might be more susceptible to BPA exposure. We exposed pregnant CD-1 mice to BPA at different times during gestation that correspond to specific milestones of in utero mammary gland development. The mammary glands of early-life and adult female mice, exposed in utero to BPA, were morphologically and molecularly (estrogen receptor-α and Ki67) evaluated for developmental abnormalities. We found that BPA treatment occurring before mammary bud invasion into the mesenchyme [embryonic day (E)12.5] incompletely resulted in the measured phenotypes of mammary gland defects. Exposing mice up to the point at which the epithelium extends into the precursor fat pad (E16.5) resulted in a nearly complete BPA phenotype and exposure during epithelial extension (E15.5 to E18.5) resulted in a partial phenotype."
  • Review - Mammary Gland Development Comparison of Mouse and Human[3] "The mouse mammary gland is widely used as a model for human breast cancer and has greatly added to our understanding of the molecular mechanisms involved in breast cancer development and progression. To fully appreciate the validity and limitations of the mouse model, it is essential to be aware of the similarities and also the differences that exist between the mouse mammary gland and the human breast. This introduction therefore describes the parallels and contrasts in mouse mammary gland and human breast morphogenesis from an early embryonic phase through to puberty, adulthood, pregnancy, parturition, and lactation, and finally the regressive stage of involution."
More recent papers  
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Search term: Mammary Embryology | Mammary Development | Mammary Gland Development

Older papers  
These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.

See also the Discussion Page for other references listed by year and References on this current page.

  • Characterization of the correlation between ages at entry into breast and pubic hair development [4] "Among 3938 participants, estimated mean ages at entry into Tanner stage 2 for breast and pubic hair development were 10.19 and 10.95, respectively."
  • Elevated Circulating IGF-I Promotes Mammary Gland Development and Proliferation[5] "Animal studies have shown that Insulin-like growth factor 1 (IGF-1, somatomedin-C) is essential for mammary gland development. Previous studies have suggested that local IGF-I rather than circulating IGF-I is the major mediator of mammary gland development. "
  • Editorial: The Mammary Stroma in Normal Development and Function[6] "Many lines of evidence have evolved to reinforce the notion that mammary epithelial cell growth, differentiation, lactation and progression to cancer involves bidirectional interactions between the epithelial population and its surrounding stroma. ...the stromal environment constitutes and supports a critical vasculature that supplies nutrients and endocrine cues, a lymphatic system that not only removes metabolites but also provides an intimate interface with the immune system, and an extracellular matrix scaffold in which epithelial cells grow, differentiate and regress."

Textbooks

  • Human Embryology (2nd ed.) Larson Chapter 14 p443-455
  • The Developing Human: Clinically Oriented Embryology (6th ed.) Moore and Persaud Chapter 20: P513-529
  • Before We Are Born (5th ed.) Moore and Persaud Chapter 21: P481-496
  • Essentials of Human Embryology Larson Chapter 14: P303-315
  • Human Embryology, Fitzgerald and Fitzgerald
  • Color Atlas of Clinical Embryology Moore Persaud and Shiota Chapter 15: p231-236

Development Overview

  • week 6 epidermis downgrowth into dermis, modified sweat glands
    • epithelia/mesenchyme inductive interaction, mesenchyme forms connective tissue and fat
  • mammary ridges - mammary bud formation, pair of ventral regions axilla to inguinal
    • pectoral regions generate breasts
  • buds branch to form lactiferous ducts, only main duct formed at birth
  • mammary pit - forms fetal period
  • areola - depressed region at gland, proliferation of connective tissue postnatally
  • prior to puberty male and female glands the same

Anatomy

The mamma consists of gland tissue; of fibrous tissue, connecting its lobes; and of fatty tissue in the intervals between the lobes. The gland tissue, when freed from fibrous tissue and fat, is of a pale reddish color, firm in texture, flattened from before backward and thicker in the center than at the circumference.


The subcutaneous surface of the mamma presents numerous irregular processes which project toward the skin and are joined to it by bands of connective tissue. It consists of numerous lobes, and these are composed of lobules, connected together by areolar tissue, blood vessels, and ducts.


The smallest lobules consist of a cluster of rounded alveoli, which open into the smallest branches of the lactiferous ducts; these ducts unite to form larger ducts, and these end in a single canal, corresponding with one of the chief subdivisions of the gland. The number of excretory ducts varies from fifteen to twenty; they are termed the tubuli lactiferi.

(from Gray's Anatomy)

Adult female mammary anatomy cartoon

Puberty

  • sex hormone estrogen stimulate growth, full development approx 20 years
  • gland branching morphogenesis commences[7]
    • stimulated by - growth hormone (GH), estrogen, insulin-like growth factor 1 (IGF1)
  • growth also influenced by other hormones - progesterone, prolactin, and corticoids
  • mainly fat and connective tissue deposition

Tanner Mammary Development Stages

In 1976 Tanner and Whitehouse established a series of descriptive stages for primary and secondary sexual characteristic development at puberty. The female secondary sex characteristics of breast development were divided into five numbered (I - V) "Tanner Stages".[8]


Tanner stages

Mammary Fat Pad

The mammary fat pad is present at birth as a depot of adipose tissue lying beside the mammary primitive epithelial structures.[9]

During puberty the mammary fat pad develops and is filled by the expanding glandular ductal tree. The fat pad is composed of both adipocytes and fibrous tissue forming white adipose tissue (WAT).[10] This adipose tissue acts as a stroma interacting with the mammary epithelium and provides signals required for ductal morphogenesis and alveolar differentiation.[11]


Mammary Glands Pregnancy

During pregnancy raised estrogens and progesterone stimulate gland development, secretory alveolar structures form and differentiate, leading to milk production in late pregnancy and milk secretion during lactation. Breasts are hemispherical in shape due to fat deposition. After birth, neonatal lactation supports further growth/development.

Mammary Glands Weaning

After the infant ceases breast feeding, weaning, the mammary gland milk-producing epithelial cells undergo a process called "involution", that requires cell apoptosis (programmed cell death).

Mammary involution.jpg

Mammary involution[12]

Histology

Adult female mammary anatomy cartoon

The mammary glands are modified glands of the skin and their development is similar to that of sweat glands.

  • compound branched alveolar glands, secretory unit is the alveolus
  • consist of 15-25 lobes separated by dense interlobar connective tissue and fat.
  • each lobe contains an individual gland.
  • lactiferous duct - excretory duct of each lobe with own opening on the nipple.
    • cuboidal to columnar epithelium, surrounded by myoepithelial cells.

Alveolus

  • inner layer of cuboidal secretory epithelial cells
    • apocrine secretion, protein micelles are release by exocytosis.
  • outer layer of myoepithelial cells
    • located between the secretory cells and the surrounding basal lamina.
    • contraction helps force the milk from the secretory alveoli into the ducts.

Note - plasma cells in the stroma also secrete antibodies (dimeric IgA) and released into the milk, to provides passive immunity to the suckling young.

Lactiferous duct Lactating mammary gland Apocrine secretion
Lactiferous duct 01.jpg Mammary gland 01.jpg Apocrine secretion animation.gif

Mouse Mammary

Mouse mammary gland development (E14.5)[13]
Mouse Mammary Timeline
Day Event
E10 milk line first formed by a slight thickening and stratification of the surface ectoderm.
E10.5 expression of Wnt10b in mammary lines on the trunk between the limbs and in axillary and inguinal streaks.
E11.5 milk line breaks up into individual placodes and the underlying mammary mesenchyme begins to condense.
E15.5 mammary epithelium begins to proliferate at the tip and the primary sprout pushes through the mammary mesenchyme towards the underlying fat pad.
E18.5 elongating duct has now grown into the fat pad and has branched into a small ductal system. Cells of the mammary mesenchyme have formed the nipple, which is made of specialized epidermal cells.
Data source[14]   Related Images: E10/11 | E11 | E12 | E13 | E14.5

Molecular

Mainly from mouse studies.[15]

  • Wnt10b - first streak initially fragmented expression pattern
  • Pax3 - dorsalized position indicate somitic involvement in streak formation
  • FGF10 - expressed in hypaxial dermomyotomal tips of somites, activates receptor FGFR2-IIIb in overlying surface ectoderm.

Wnt Signaling

Canonical Wnt signals are transduced through a Frizzled receptor and the LRP5 or LRP6 co-receptor. Loss of Lrp6 compromises Wnt/beta-catenin signaling and interferes with mammary placode, fat pad, and branching development during embryogenesis.[16]

Non-canonical receptor Ror2 along with its ligand Wnt5b (expressed in both the basal and luminal cell layers) regulates the branching, differentiation, and actin-cytoskeletal dynamics within the mammary epithelium.[17]


Links: Wnt | Mouse Timeline Detailed


Abnormalities

 ICD-11

LB60 Breast aplasia - A condition caused by failure of the breast to develop during the antenatal period. This condition is characterized by a total lack of breast tissue. This condition may also present with absence of the nipple or pectoral muscle.

LB61 Absent nipple - A condition caused by failure of the nipple to develop during the antenatal period. This condition is characterized by a total lack of a nipple. This condition may also present with absence of the breast or pectoral muscle.

LB62 Supernumerary breasts - A condition caused by failure of the breasts to correctly develop during the antenatal period. This condition is characterized by supernumerary breasts, with or without nipples. This condition may be asymptomatic.

LB63 Accessory nipple - A condition caused by development of supernumerary nipples during the antenatal period. This condition is characterized by the presence of nipples or nipple-like structures additional to the normal two. This condition may be asymptomatic.

Abnormalities occur in approximately 1% of female population and include in both sexes:

  • polymastia - extra breast
  • polytheli - extra nipple
  • supernumerary nipple (relatively common in males)
  • unilateral polythelia or polymastia - occurs most frequently on the left side in humans[18]
  • gynecomastia (Greek, gyne = woman, mastos = breast) is the excessive development of the male breast, which can occur transiently in puberty or due to other (hormonal) abnormalities.


Historic 1915 Kajava classification of supernumerary nipple types:[19]

  • Complete supernumerary nipple-Nipple, areola, and glandular breast tissue
  • Supernumerary nipple-Nipple and glandular tissue (no areola)
  • Supernumerary nipple-Areola and glandular tissue (no nipple)
  • Aberrant glandular tissue only
  • Supernumerary nipple-Nipple and areola and pseudomamma (fat tissue replaces glandular tissue)
  • Supernumerary nipple-Nipple only (the most common supernumerary nipple)
  • Supernumerary nipple-Areola only (polythelia areolaris)
  • Patch of hair only (polythelia pilosa)

Breast Cancer

In 1994, two breast cancer susceptibility genes were identified BRCA1 on chromosome 17 and BRCA2 on chromosome 13.

When an individual carries a mutation in either BRCA1 or BRCA2, they are at an increased risk of being diagnosed with breast or ovarian cancer at some point in their lives. Normal function of these genes was to participate in repairing radiation-induced breaks in double-stranded DNA. It is though that mutations in BRCA1 or BRCA2 might disable this mechanism, leading to more errors in DNA replication and ultimately to cancerous growth. (text modified from: NCBI genes and disease)

BRAC1 and more recently BRIP1 (BRCA1-interacting protein 1) appear to be statistically the more common cancer genes associated with breast cancer.

Links: OMIM - BRCA1 | OMIM - BRCA2 | OMIM - BRIP1


Australia - Breast cancer in young women

New cases of breast cancer by histology type and age group (Australia, 2009)

26 Oct 2015 Key facts about breast cancer in women in their 20s and 30s[20]

  • In 2015, it is projected that 795 young women will be diagnosed with breast cancer and 65 will die from this disease.
    • On average, this is more than 2 breast cancers diagnosed every day and more than 1 death every week.
  • most commonly diagnosed cancer for women aged 20 to 39 and is associated with poorer survival outcomes.
    • for women aged 40 and over, 40 new cases per day and 57 deaths per week-breast cancer.
  • Overall, 5-year relative survival is significantly lower in younger women, who had an 88% chance of surviving for 5 years in 2007-2011 compared with the 5-year relative survival rate for women aged 40 and over of 90%. However, the 5-year relative survival rate has improved for young women, from 72% in 1982-1986 to 88% in 2007-2011.
Links: Australian Statistics

References

  1. Seachrist DD & Keri RA. (2019). The Activin Social Network: Activin, Inhibin and Follistatin in Breast Development and Cancer. Endocrinology , , . PMID: 30874767 DOI.
  2. Hindman AR, Mo XM, Helber HL, Kovalchin CE, Ravichandran N, Murphy AR, Fagan AM, St John PM & Burd CJ. (2017). Varying Susceptibility of the Female Mammary Gland to In Utero Windows of BPA Exposure. Endocrinology , 158, 3435-3447. PMID: 28938483 DOI.
  3. McNally S & Stein T. (2017). Overview of Mammary Gland Development: A Comparison of Mouse and Human. Methods Mol. Biol. , 1501, 1-17. PMID: 27796946 DOI.
  4. Christensen KY, Maisonet M, Rubin C, Flanders WD, Drews-Botsch C, Dominguez C, McGeehin MA & Marcus M. (2010). Characterization of the correlation between ages at entry into breast and pubic hair development. Ann Epidemiol , 20, 405-8. PMID: 20382343 DOI.
  5. Cannata D, Lann D, Wu Y, Elis S, Sun H, Yakar S, Lazzarino DA, Wood TL & Leroith D. (2010). Elevated circulating IGF-I promotes mammary gland development and proliferation. Endocrinology , 151, 5751-61. PMID: 20926579 DOI.
  6. Schedin P & Hovey RC. (2010). Editorial: The mammary stroma in normal development and function. J Mammary Gland Biol Neoplasia , 15, 275-7. PMID: 20824491 DOI.
  7. Macias H & Hinck L. (2012). Mammary gland development. Wiley Interdiscip Rev Dev Biol , 1, 533-57. PMID: 22844349 DOI.
  8. Tanner JM & Whitehouse RH. (1976). Clinical longitudinal standards for height, weight, height velocity, weight velocity, and stages of puberty. Arch. Dis. Child. , 51, 170-9. PMID: 952550
  9. Anbazhagan R, Bartek J, Monaghan P & Gusterson BA. (1991). Growth and development of the human infant breast. Am. J. Anat. , 192, 407-17. PMID: 1781450 DOI.
  10. Neville MC, Medina D, Monks J & Hovey RC. (1998). The mammary fat pad. J Mammary Gland Biol Neoplasia , 3, 109-16. PMID: 10819521
  11. Hovey RC & Aimo L. (2010). Diverse and active roles for adipocytes during mammary gland growth and function. J Mammary Gland Biol Neoplasia , 15, 279-90. PMID: 20717712 DOI.
  12. Watson CJ. (2006). Involution: apoptosis and tissue remodelling that convert the mammary gland from milk factory to a quiescent organ. Breast Cancer Res. , 8, 203. PMID: 16677411 DOI.
  13. Howard B & Ashworth A. (2006). Signalling pathways implicated in early mammary gland morphogenesis and breast cancer. PLoS Genet. , 2, e112. PMID: 16933995 DOI.
  14. Robinson GW. (2007). Cooperation of signalling pathways in embryonic mammary gland development. Nat. Rev. Genet. , 8, 963-72. PMID: 18007652 DOI.
  15. Veltmaat JM, Ramsdell AF & Sterneck E. (2013). Positional variations in mammary gland development and cancer. J Mammary Gland Biol Neoplasia , 18, 179-88. PMID: 23666389 DOI.
  16. Lindvall C, Zylstra CR, Evans N, West RA, Dykema K, Furge KA & Williams BO. (2009). The Wnt co-receptor Lrp6 is required for normal mouse mammary gland development. PLoS ONE , 4, e5813. PMID: 19503830 DOI.
  17. Roarty K, Shore AN, Creighton CJ & Rosen JM. (2015). Ror2 regulates branching, differentiation, and actin-cytoskeletal dynamics within the mammary epithelium. J. Cell Biol. , 208, 351-66. PMID: 25624393 DOI.
  18. Schmidt H. (1998). Supernumerary nipples: prevalence, size, sex and side predilection -- a prospective clinical study. Eur. J. Pediatr. , 157, 821-3. PMID: 9809822
  19. Kajava Y. The proportions of supernumerary nipples in the Finnish population. Duodecim. 1915;1:143–70.
  20. AIHW 2015. Breast cancer in young women: key facts about breast cancer in women in their 20s and 30s. Cancer series no. 96. Cat. no. CAN 94. Canberra: AIHW. http://www.aihw.gov.au/publication-detail/?id=60129553359


Journals

Reviews

McNally S & Stein T. (2017). Overview of Mammary Gland Development: A Comparison of Mouse and Human. Methods Mol. Biol. , 1501, 1-17. PMID: 27796946 DOI.

Javed A & Lteif A. (2013). Development of the human breast. Semin Plast Surg , 27, 5-12. PMID: 24872732 DOI.

Huebner RJ & Ewald AJ. (2014). Cellular foundations of mammary tubulogenesis. Semin. Cell Dev. Biol. , 31, 124-31. PMID: 24747369 DOI.

Lefèvre CM, Sharp JA & Nicholas KR. (2010). Evolution of lactation: ancient origin and extreme adaptations of the lactation system. Annu Rev Genomics Hum Genet , 11, 219-38. PMID: 20565255 DOI.

Cowin P & Wysolmerski J. (2010). Molecular mechanisms guiding embryonic mammary gland development. Cold Spring Harb Perspect Biol , 2, a003251. PMID: 20484386 DOI.

Dimitrakakis C & Bondy C. (2009). Androgens and the breast. Breast Cancer Res. , 11, 212. PMID: 19889198 DOI.

Rowzee AM, Lazzarino DA, Rota L, Sun Z & Wood TL. (2008). IGF ligand and receptor regulation of mammary development. J Mammary Gland Biol Neoplasia , 13, 361-70. PMID: 19020961 DOI.

LaMarca HL & Rosen JM. (2008). Minireview: hormones and mammary cell fate--what will I become when I grow up?. Endocrinology , 149, 4317-21. PMID: 18556345 DOI.

Richert MM, Schwertfeger KL, Ryder JW & Anderson SM. (2000). An atlas of mouse mammary gland development. J Mammary Gland Biol Neoplasia , 5, 227-41. PMID: 11149575


Articles

Veltmaat JM, Ramsdell AF & Sterneck E. (2013). Positional variations in mammary gland development and cancer. J Mammary Gland Biol Neoplasia , 18, 179-88. PMID: 23666389 DOI.

Nair R, Junankar S, O'Toole S, Shah J, Borowsky AD, Bishop JM & Swarbrick A. (2010). Redefining the expression and function of the inhibitor of differentiation 1 in mammary gland development. PLoS ONE , 5, e11947. PMID: 20689821 DOI.

Owens TW, Foster FM, Tanianis-Hughes J, Cheung JY, Brackenbury L & Streuli CH. (2010). Analysis of inhibitor of apoptosis protein family expression during mammary gland development. BMC Dev. Biol. , 10, 71. PMID: 20584313 DOI.

McCormick N, Velasquez V, Finney L, Vogt S & Kelleher SL. (2010). X-ray fluorescence microscopy reveals accumulation and secretion of discrete intracellular zinc pools in the lactating mouse mammary gland. PLoS ONE , 5, e11078. PMID: 20552032 DOI.

Barker HE, Smyth GK, Wettenhall J, Ward TA, Bath ML, Lindeman GJ & Visvader JE. (2008). Deaf-1 regulates epithelial cell proliferation and side-branching in the mammary gland. BMC Dev. Biol. , 8, 94. PMID: 18826651 DOI.

Ramsay DT, Kent JC, Hartmann RA & Hartmann PE. (2005). Anatomy of the lactating human breast redefined with ultrasound imaging. J. Anat. , 206, 525-34. PMID: 15960763 DOI.


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Historic

Historic Disclaimer - information about historic embryology pages 
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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Keith A. Human Embryology and Morphology. (1902) London: Edward Arnold.

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.

Terms

  • milk line - (primary mammary ridge) a surface thickening of the ectoderm extending along the body wall on either side from axilla to groin.
  • primary mammary ridge - (milk line) a surface thickening of the ectoderm extending along the body wall on either side from axilla to groin.

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Cite this page: Hill, M.A. (2019, August 22) Embryology Integumentary System - Mammary Gland Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Integumentary_System_-_Mammary_Gland_Development

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