Publications

Types of ovarian activity in women and their significance: the continuum (a reinterpretation of early findings) [Human Reproduction Update, 17(2), 141–58]

Author: Brown, J. B. (2010)

Abstract/Summary

There are many types of ovarian activity that occur in women. This review provides information on the relationship between the hormone values and the degree of biological response to the hormones including the frequency and degree of uterine bleeding. The continuous process is termed the ‘Continuum’ and is thus similar to other processes in the body.

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The role of kisspeptin on the onset of puberty and on the ovulatory mechanism: A minireview [Journal of Pediatric and Adolescent Gynecology, 28(5), 286–291]

Author: Cortés, M. E., Carrera, B., Rioseco, H., del Río, J. P., & Vigil, P. (2015).

Abstract/Summary

The onset of puberty has been a fascinating topic for reproductive endocrinologists for decades; however, its underlying physiological mechanisms have remained elusive until recently. The discovery and understanding of the effects exerted by the peptide hormone kisspeptin have shed light on this research area. This review is aimed to discuss the functions of kisspeptin, with special focus on its role in the onset of puberty and in the ovulatory mechanism. The points under discussion are (1) the characteristics of kisspeptin and its receptor, (2) the relevance of this hormone and its interaction with leptin in the onset of puberty, (3) the role of kisspeptin in the ovulatory mechanism based on its differential expression at hypothalamic nuclei, which is modulated by sex steroid hormones, and (4) the clinical relevance of kisspeptin and its antagonists in new therapeutic strategies for the treatment of various reproductive pathologies. All of this explains the revolution that kisspeptin has caused among researchers working in the field of gynecological endocrinology and reproductive biology.

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The effects of hormonal contraceptives on glycemic regulation [The Linacre Quarterly, 81(3), 209–218]

Author: Cortés, M. E., & Alfaro, A. a. (2014)

Abstract/Summary

A number of side effects have been linked to the use of hormonal contraceptives, among others, altera- tions in glucose levels. Hence, the objective of this mini-review is to show the main effects of hormonal contraceptive intake on glycemic regulation. First, the most relevant studies on this topic are described, then the mechanisms that might be accountable for this glycemic regulation impairment as exerted by hormonal contraceptives are discussed. Finally, we briefly discuss the ethical responsibility of health pro- fessionals to inform about the potential risks on glycemic homeostasis regarding hormonal contraceptive intake.

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Highly symmetrical crystallization in six rectilinear and well- defined axes found in bovine cervical mucus obtained at oestrus: a finding. [Revista de La Facultad de Medicina Veterinaria y de Zootecnia, 61(2), 167-170]

Author: Cortés, M. E., González, F., Hauyón, R., & Vigil. Pilar. (2014)

Abstract/Summary

Bovine cervical mucus (BCM) is important for selection and transport of spermatozoa. When air-dried, BCM obtained at oestrus exhibits arborescent crystallizations, among other arrangements. Considering the relevant endocrine and reproductive information indirectly obtained from BCM crystallization, a morphological investigation was carried out to study its crystalline patterns. BCM samples were collected from healthy Holstein Friesian heifers at oestrus, their crystalline patterns photographed and its morphology analyzed. The majority of the crystallizations obtained showed the typical tree-like patterns reported for BCM. However, a highly symmetrical arrangement was found, characteri- zed by a star-like morphology with six straight, highly defined axes that protrude from the same central point, forming 60o angles. In terms of current knowledge, this short report is the first to show this crystallization geometry in BCM, which, additionally, is remarkably similar to P6B mucus reported for periovulatory human cervical mucus. Even though the role of mucus presenting this type of crystallization is as yet unknown for bovines, its possible functions are also briefly discussed here.

Key words: Bovine cervical mucus, crystallization, oestrus, P6B mucus.

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Crystallization of Bovine Cervical Mucus at Oestrus : An Update [Rev Med Vet, 28, 103-16]

Author: Cortés, M. E., González, F., & Vigil, P. (2014)

Abstract/Summary

Bovine cervical mucus changes its biochemical composition and biophysical properties due to the variations in sex steroid levels during the oestrous cycle. As a consequence of oestro- gen rise, cervical mucus is produced in larger amounts at oestrus—a stage also characterized by an increase in mucus crystallization when observed under light microscopy. The objective of this article is to provide an updated review of the main aspects regarding crystallization of bovine cervical mucus. First, it makes reference to the composition of cervical mucus and the critical functions that this secretion exerts on bovine reproductive physiology, as well as in other species. Then, the article deals with the phenomenon of crystallization observed in cervical mucus, describing the main models used to classify the crystalline patterns ob- servable in mucus at oestrus stage (some of them resembling ferns, palm leaves and stellar patterns, among others). Finally, it addresses the importance of the phenomenon of cervical mucus crystallization for the understanding of bovine reproductive physiology.

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Monitoring of ovarian activity by measurement of urinary excretion rates using the Ovarian Monitor, Part IV [Hum Reprod., 31(2), 445-53]

Author: Leonard F. Blackwell; Pilar Vigil; Maria Elena Alliende; Simon Brown; Mario Festin; Delwyn, G. Cooke

Abstract/Summary

The relationship of the pregnanediol glucuronide threshold to basal body temperature and cervical mucus as markers for the beginning of the post-ovulatory infertile period

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