Mouse Estrous Cycle
Rats and mice are examples of polyestrus mammals (as are cats which are seasonally polyoestrus). Monestrus forms (most wild animals - foxes, bears, wolves etc.) complete a single estrous cycle annually. In the wild, rats and mice probably suspend the cycle for a period during the winter; the reproductive organs are in a state of quiescence, called anestrus.
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Some Recent Findings
Mouse Estrous Cycle
|Diestrus||Small follicles only are present with large corpora lutea from the previous ovulation. These secrete for only a very short time unless pregnancy or pseudopregnancy intervene.||Small and anaemic, low motility, lumen small and slit-like. Cells of the uterine mucosa columnar; polymorphonuclear leucocytes in stroma; endometrial glands collapsed, atrophic.||Epithelium thin, mitotic figures infrequent. Leucocytes abundant in stroma, migrate through the epithelium into vaginal lumen.||Stringy mucous in which are entangled many leucocytes and a few nucleated epithelial cells.|
|Proestrus||Some follicles grow rapidly.||Become more vascular, water content increases, organ distends. Contractility more pronounced. Epithelial cells become higher (continuing into estrus). Leucocytes disappear from mucosa. Endometrial glands hypertrophy.||Epithelum thickens, numerous mitoses in inner layers. Old layers of epithelium line the lumen. Leucocytes no longer migrate through the epithelium. Superficial epithelial cells slough off into lumen.||Largely small, round, nucleated epithelial cells, singly or in sheets. None to few leucoytes.|
|Estrus||Ovulation in the rat is spontaneous and occurs about 10 hours after the beginning of estrus. "Heat" (receptivity) lasts about 13 hours. Usually 10-20 eggs ovulated each time.||gains maximum vascularisation. Epithelial cells reach maximum development. No leucocytes.||Outer layer of epithelial cells become cornified and sloughed into the lumen. In early estrus these cells retain their nuclei, but in later stages no nuclei visible and the cells are irregular, flat, cornified plates. The skin around the vaginal orifice becomes swollen.||Contains hundreds of large cornified cells (squames) with degenerate nuclei. Towards the end of estrus the smear becomes "cheesy" - masses of adherent cornified cells.|
|Metestrus||Many corpora lutea, which secrete only for a very short time, and small follicles.||Epithelium continues vacuolar degeneration and replacement. Leucocytes in stroma. Decrease in size and vascularity.||Deeper layers of the estrous epithelium now line the lumen, the older, superficial layers having become cornified and sloughed off. Reduction of mitotic activity in epithelium. Leucocytes in stroma and migrating through the epithelium into the lumen.||Many leucocytes and a few cornified cells.|
Mouse Ovarian Follicle Size
Image Source: High-resolution ultrasound biomicroscopy for monitoring ovarian structures in mice. 
For more detailed histological information see [#Champlin Champlin etal., 1973].
The changes in the uterus may not be particularly well-marked.
1. Histological changes in the luminal epithelium
2 Histological changes in the glandular epithelium
3. Secretory activity of uterine glands
4. Changes in stromal cells, e.g. number of leucocytes
5. Overall changes in the size distention and shape of the lumen.
Note the changes in the vaginal epithelium.
1. The number of mitotic figures
2. The number of layers in the epithelium
3. The amount of cornification, and the changes from live to dead cells.
4. Surface mucus coating the epithelium
5. Presence or absence of infiltrating polymorphonuclear leucocytes.
Relate the appearance of the smears to the sections of the vagina, noting particularly the composition of cells in the smear and the vaginal epithelium.
1. Relative numbers and appearance of cell types - epithelial and polymorphs.
2. Presence of mucus.
Carnegie Stages Comparison
|Data For Carnegie Stages Comparison Graph (Species/Days)|| |
Human - O'Rahilly, Early human development and the chief source of information on staged human embryos. Eur. J. Obstet. Gynec. Reprod. Biol. 9 p273 (1979)
Mouse - Theiler, The house mouse. Springer-Verlag, NY (1972)
Rat - Witschi, Growth. Altman and Dittmer (ed), Fed. Soc. Exp. Biol., Washington (1962)
- ↑ Sarah L Mader, Nicole L Libal, Kathleen Pritchett-Corning, Rui Yang, Stephanie J Murphy Refining timed pregnancies in two strains of genetically engineered mice. Lab Anim (NY): 2009, 38(9);305-10 PMID:19701181
- ↑ Claudia S Caligioni Assessing reproductive status/stages in mice. Curr Protoc Neurosci: 2009, Appendix 4();Appendix 4I PMID:19575469
- ↑ M J Bilinski, J G Thorne, M J Oh, S Leonard, C Murrant, C Tayade, B A Croy Uterine NK cells in murine pregnancy. Reprod. Biomed. Online: 2008, 16(2);218-26 PMID:18284876
- ↑ Anne Bachelot, Nadine Binart Corpus luteum development: lessons from genetic models in mice. Curr. Top. Dev. Biol.: 2005, 68();49-84 PMID:16124996
- ↑ Kaushik Deb, Jeff Reese, Bibhash C Paria Methodologies to study implantation in mice. Methods Mol. Med.: 2006, 121();9-34 PMID:16251731
- ↑ Rajesh S Jaiswal, Jaswant Singh, Gregg P Adams High-resolution ultrasound biomicroscopy for monitoring ovarian structures in mice. Reprod. Biol. Endocrinol.: 2009, 7();69 PMID:19580664 | PMC2714516
Yong-Jun Yang, Yu-Jing Cao, Shu-Min Bo, Sha Peng, Wei-Min Liu, En-Kui Duan Leptin-directed embryo implantation: leptin regulates adhesion and outgrowth of mouse blastocysts and receptivity of endometrial epithelial cells. Anim. Reprod. Sci.: 2006, 92(1-2);155-67 PMID:16023802
Kaushik Deb, Jeff Reese, Bibhash C Paria Methodologies to study implantation in mice. Methods Mol. Med.: 2006, 121();9-34 PMID:16251731
Dong-Soo Lee, Yoshiko Yanagimoto Ueta, Xuenan Xuan, Ikuo Igarashi, Kozo Fujisaki, Chihiro Sugimoto, Yutaka Toyoda, Hiroshi Suzuki Expression patterns of the implantation-associated genes in the uterus during the estrous cycle in mice. J. Reprod. Dev.: 2005, 51(6);787-98 PMID:16210782
Pei Su, Joyce C Wu, Jeffrey R Sommer, A Jesse Gore, Robert M Petters, William L Miller Conditional induction of ovulation in mice. Biol. Reprod.: 2005, 73(4);681-7 PMID:15917351
A K Champlin, D L Dorr, A H Gates Determining the stage of the estrous cycle in the mouse by the appearance of the vagina. Biol. Reprod.: 1973, 8(4);491-4 PMID:4736343
Search Nov 2009 "estrous cycle" 55440 reference articles of which 4042 were reviews.
- a disintegrin and metalloproteinase - (ADAM) a large family (-8, -9, -10, -12, -15 and -17) of secreted proteins suggested to be involved in remodelling mouse uterine tissue during the oestrous cycle.
- anestrus - lack of a normal estrus cycle.
- Bruce Effect - pheromones from a strange male can prevent embryo implantation in recently bred female.
- calling behaviour - vocalization, vocal communication sounds associated with reproductive behaviour in several species.
- Lee-Boot Effect - female mice housed together (in groups) results in a synchronization of their estrus cycles. In addition, the extended absence of male pheromones leads to a state of anestrus (lack of a normal estrus cycle).
- major urinary proteins - (MUPs) proteins which carry volatile substances, including pheromones, and protect them during their internal passage (liver to kidneys into urine).
- pheromone - a secreted chemical in sweat or urine that causes specific physiological responses.
- Whitten Effect - female mice either singly or housed together (in groups) can be induced into estrus by exposure to male mouse urine or their dirty bedding. The estrous cycle is applicable to many different species, not just the mouse reproductive cycle.
Spelling Note: When searching both American (estrous) and British (oestrous) spellings are used in the literature (More? American and British Spelling Variations). My thanks also to Prof Jill Becker for correcting an obvious spelling error on this page "The adjective is spelled with a 'u' after the o. 'Estrus' refers to the stage of the cycle and is the noun form of the word."
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Cite this page: Hill, M.A. (2014) Embryology Mouse Estrous Cycle. Retrieved April 23, 2014, from http://embryology.med.unsw.edu.au/embryology/index.php?title=Mouse_Estrous_Cycle
- Dr Mark Hill 2014, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G