Search results for "sperma"
showing 10 items of 296 documents
65 ASSOCIATION BETWEEN ALDOSTERONE AND CORTISOL LEVELS DURING THE OVULATORY PERIOD IN SPANISH PUREBRED MARES
2014
Preovulatory increased aldosterone (ALD) has been described as one of the physiological events that characterise the oestrous cycle in relation to the dynamics of the renin angiotensin aldosterone system. Within the mechanisms associated with this response are the stimulating effect of oestrogen on the synthesis of angiotensinogen, haemodynamic variations of renal blood flow, changes in sodium concentration, changes in the local sympathetic activity, and the effect of cortisol (CORT). In fact, CORT via adrenocorticotropic hormone contributes primarily to preovulatory ALD, and it is the primary regulator factor synthesis ALD (Chidambaram et al. 2002; Pechère-Bertschi et al. 2002; Szmuilowic…
Antioxidants in ICSI
2013
Male factor infertility can be caused by reasons, either related or not with total sperm production. Among causes of male infertility in cases of normal sperm count and motility, oxidative stress is one of the most relevant processes influencing fertility in vivo or in assisted reproduction treatments’ results. This chapter provides the most updated information regarding the oxidative stress situation in sperm and the relevance of antioxidants use in intracytoplasmic sperm injection results.
Aislamiento, cultivo, caracterización y maduración de células indiferenciadas desde biopsias testiculares humanas
2013
En el testículo existe una población de células pluripotentes, las Espermatogonias Stem Cells (SSC), responsables de la autorrenovación y la diferenciación, manteniendo así la espermatogénesis. La espermatogénesis es el proceso en el cual la espermatogonia sufre una serie de divisiones hasta originar el espermatozoide, que son las células fundamentales para transmitir la información genética a las generaciones futuras. Recientemente, han sido publicados una serie de estudios mostrando la posibilidad de generar células pluripotentes a partir de biopsias testiculares humanas de individuos adultos (Conrad et al., 2008; Kossack et al. ,2008). Los resultados obtenidos en éstos trabajos en humano…
Caracterización de la expresión y función de las taquicininas en el espermatozoide humano
2017
En nuestro país y, en general, en los países industrializados, los problemas de fertilidad son cada vez más frecuentes y actualmente se estima que entre un 15-20% de las parejas en edad reproductiva tienen problemas para concebir de manera natural. El factor masculino es responsable de aproximadamente el 40% de los casos de infertilidad. Como consecuencia de este incremento en los niveles de infertilidad, en los últimos años se han producido avances muy importantes en la medicina reproductiva y se han desarrollado una gran variedad de técnicas de reproducción asistida, pero aún queda mucho camino por recorrer. En relación a la infertilidad masculina, la prueba inicial en las clínicas de rep…
Endocrine effects of sauna bath
2020
Sauna bath brings about numerous acute changes in hormone levels, partly akin to other stressful situations, partly specific for sauna. Norepinephrine increases in those accustomed to sauna bath. Sweating increases the production of antidiuretic hormone, and the renin-angiotensin system becomes activated. Of the anterior pituitary hormones, growth hormone (GH) and prolactin (PRL) secretion is increased. Also β-endorphin has been frequently reported to increase, whereas the responses of ACTH and cortisol are variable, probably depending on the type of sauna exposure. Sperm production decreases in particular in sauna-naïve men, but reduced fertility has not been associated with regular sauna …
Apoptosis rate in human spermatozoa: a sperm quality assay.
2009
Several studies have demonstrated the relationship between gonadotrophine serum levels and the apoptosis rate in germinal cells (Bosco et al 2005). In human, lower FSH serum levels are associated with reduced Sperm Standard Parameters in term of concentration, motility and morphology and higher sperm DNA fragmentation. Hypogonadotrope hypogonadism is a clinical condition associated with male infertility, characterized by low serum levels of gonadotrophins. In this pilot study we investigated the spermatozoa quality of 11 patients with development of hypogonadotrope hypogonadism urdergoing in vitro fertilization programs. Recombinant-FSH administered to improve the sperm parameters, apoptosi…
Profound Transcriptomic Differences Found between Sperm Samples from Sperm Donors vs. Patients Undergoing Assisted Reproduction Techniques Tends to D…
2010
Background Although spermatozoa delivers its RNA to oocytes at fertilization, its biological role is not well characterized. Our purpose was to identify the genes differentially and exclusively expressed in sperm samples both before and after the swim-up process in control donors and infertile males with the purpose to identify their functional significance in male fertility. Materials and methods This was a nested case-control study. Ten sperm samples were obtained from infertile patients [n=5 (two aliquots each from five samples; one before the swim-up process and one after)] and donors [n=5 (two aliquots from five samples, one before the swim-up process and one after)]. Oligonucleotide m…
Lierojen parittelumenestyksen yhteys sää- ja ympäristöoloihin, yksilötiheyteen ja yksilön kokoon
2011
Yksilön kelpoisuus riippuu jälkeläistuotosta, ja parittelumenestys on yksi jälkeläistuoton avaintekijöistä. Monien eläinlajiryhmien lisääntymistä on tutkittu laajasti sekä laboratorio-oloissa että luonnossa, mutta lierojen lisääntymismenestykseen vaikuttavia tekijöitä luonnonpopulaatioissa ei vielä juurikaan tunneta. Tämän tutkimuksen tavoitteena oli selvittää, miten kahden ekologialtaan erilaisen lierolajin parittelumenestys riippuu ympäristöoloista, yksilötiheydestä ja yksilön koosta. Tutkimuksessa käytettiin tietoja lieronäytteistä, jotka oli kerätty syksyinä 2004 ja 2005 viljelymailta eri puolilta Suomea. Spermatoforien esiintymistä yksilöillä käytettiin indikaattorina näytteenottoa ede…
Lipo-Sarcoma Multifocale del Funicolo Spermatico: indicazioni al trattamento chirurgico e descrizione di un caso con follow-up a lungo termine.
2006
Poster per X Riunione S.R.S.-S.I.A.. Messina (Milazzo), 28-29 Aprile 2006
Do highly ornamented and less parasitized males have high quality sperm? - an experimental test for parasite-induced reproductive trade-offs in Europ…
2014
Parasites take their resources from hosts and thus directly reduce available resources for hosts’ own body functions, such as growth and reproduction. Furthermore, parasite infections cause significant indirect costs to their hosts in terms of increased investments on immune defense. In this study, we investigated the impact of parasite infection on the sperm quality and expression of secondary sexual ornamentation (saturation of the red abdominal colouration and number of breeding tubercles) in the Eurasian minnow (Phoxinus phoxinus). We exposed minnows to a high and low dose of common nonspecific fish ectoparasite, the glochidia larvae of duck mussel (Anodonta anatina) and tested whether …