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1.
This study was conducted to determine the adequate medium for a serum‐free culture system of domestic cat embryos produced by in vitro maturation (IVM) and fertilization (IVF). Cumulusoocyte complexes recovered from cat ovaries were matured in vitro for 24 h, and then inseminated in vitro for 12 h. After insemination, the oocytes were cultured in five media [Ham's F10, Waymouth 752/1 (Waymouth), TCM199, modified Earle's balanced salt solution (MK‐1) and CR1aa], each of which contained 0.4% bovine serum albumin. There were no significant differences among the rates of fertilization of oocytes cultured in five media following IVF. The rate of oocytes/embryos developed to at least the morula stage was significantly lower (p < 0.05) in Waymouth than in MK‐1, TCM199 and CR1aa. Moreover, none of the embryos cultured in Ham's F10 and Waymouth developed to the blastocyst stage. There were no differences among the rates of development to the blastocyst stage of oocytes/embryos cultured in MK‐1, TCM199 and CR1aa. These results indicate that the type of serum‐free medium has a major impact on in vitro development of domestic cat embryos derived from IVM/IVF, and MK‐1, TCM199 and CR1aa media are suitable for in vitro culture of cat embryos in a serum‐free culture system.  相似文献   

2.
Canine inflammatory mammary cancer (IMC) has been proposed as a model for the study of human inflammatory breast cancer (IBC). The aims of this study were to compare the immunohistochemical expression of aromatase (Arom) and several hormone receptors [estrogen receptor α (ERα), estrogen receptor β (ERβ), progesterone receptor (PR) and androgen receptor (AR)], in 21 IMC cases vs 19 non‐IMC; and to study the possible effect of letrozole on canine IMC and human inflammatory breast cancer (IBC) in vitro using IPC‐366 and SUM‐149 cell lines. Significant elevations of the means of Arom Total Score (TS), ERβ TS and PR TS were found in the IMC group (p = 0.025, p = 0.038 and p = 0.037, respectively). Secondary IMC tumours expressed higher levels of Arom than primary IMC (p = 0.029). Non‐IMC PR‐ tumours contained higher levels of Arom than non‐IMC PR+ tumours (p = 0.007). After the addition of letrozole, the number of IMC and IBC cells dropped drastically. The overexpression of Arom found and the results obtained in vitro further support canine IMC as a model for the study of IBC and future approaches to the treatment of dogs with mammary cancer, and especially IMC, using Arom inhibitors.  相似文献   

3.
Follicle‐stimulating hormone (FSH) and luteinizing hormone (LH) have a central role in follicle growth, maturation and oestrus, but no clear pathway in the seasonal oestrus of yak (Bos grunniens) has been found. To better understand the role of FSH and LH in seasonal oestrus in the yak, six yaks were slaughtered while in oestrus, and the pineal gland, hypothalamus, pituitary gland, and gonads were collected. Using real‐time PCR and immunohistochemical assays, we determined the mRNA and protein expression of the FSH and LH receptors (FSHR and LHR) in these organs. The analysis showed that the FSHR mRNA expression level was higher in the pituitary gland tissue compared with LHR (p < .01) during oestrus. By contrast, there was low expression of FSHR and LHR mRNA in the pineal gland and hypothalamus. FSHR mRNA expression was higher than that of LHR (p < .05) in the ovary, whereas LHR mRNA expression was higher than that of FSHR (p < .01) in the uterus. FSHR and LHR proteins were located in the pinealocyte, synaptic ribbon and synaptic spherules of the pineal gland and that FSH and LH interact via nerve fibres. In the hypothalamus, FSHR and LHR proteins were located in the magnocellular neurons and parvocellular neurons. FSHR and LHR proteins were localized in acidophilic cells and basophilic cells in the pituitary gland, and in surface epithelium, stromal cell and gland epithelium in the uterus. In the ovary, FSHR and LHR protein were present in the ovarian follicle. Thus, we concluded that FSHR and LHR are located in the pineal gland, hypothalamus, pituitary and gonad during oestrus in the yak. However, FSHR was mainly expressed in the pituitary gland and ovaries, whereas LHR was mainly expressed in the pituitary gland and uterus.  相似文献   

4.
The monospecific antibody directed against cytokeratin 18 consistently immunostained microfold cells (M‐cells) in the ileum epithelium of pigs. In adult pigs, M‐cells were numerously distributed in the dome epithelium overlying Peyer's patches, especially in the crypt epithelium to the lower dome epithelium. The M‐cells presented in the crypt epithelium were mostly columnar in shape and showed a gradual transition from columnar cells to pocket‐like cells as they drew near the lower dome epithelium. In contrast, the M‐cells that were sporadically located in the villus epithelium were all columnar and similar to enterocytes in shape. In newborn pigs, a few M‐cells were observed only in the infant dome epithelium, which were all columnar resembling the enterocytes. Of the 19 lectins used, the dome epithelial cells were selectively stained by lectins from Ulex europaeus‐I and Anguuilla anguilla. Especially, the M‐cells were stained by lectin from Anguuilla anguilla although the intensity varied on individual pigs. Lymphoid follicles in the lamina propria were well developed in the adults compared to these in the newborns, and lymphoid cells were more populated in the lower part than the upper part of the dome. The present results provide available information to understand the differentiation and functional heterogeneity of porcine M‐cells.  相似文献   

5.
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6.
Curimatella lepidura, commonly known as the manjuba, belongs to the Curimatidae family. To assess the reproductive activity of this species, fish were collected from three sections of the São Francisco River: section 1 = the Três Marias reservoir (TMR), section 2 = the SFR immediately downstream of the TMR, and section 3 = the SFR 54 km downstream from the TMR after the confluence of the SFR with the Abaeté River. Fish were collected bimonthly from January to December 2012. From this, the gonadosomatic index (GSI), Fulton condition factor (K), gonadal maturation stages in females and males, and diameters of vitellogenic follicles were determined. That is, this study employed histological and histometrical techniques to study the ovaries and testes of collected fish. The Fulton condition factor was statistically higher in section 1 than in the other sections, indicating that C. lepidura presents better health conditions in this section. Fish in the maturation/mature gonadal stage were collected in the November/December and January/February bimesters, coinciding with high temperatures, a long photoperiod, and abundant rainfall in this region. The mean vitellogenic follicle diameter was statistically lowest for sections 2 and 3, with a better impact on reproduction than in section 1. Overall, the results show that C. lepidura has reproductive success in lentic environments, such as in section 1, the TMR.  相似文献   

7.
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8.
Hedgehog (Hh) pathway has been studied in various animal body life procedures and is suggested to be important for the development of multiple organs. The genes involved in the Hh signaling pathway were expressed in the ovary of mice, pigs and cattle. However, the function of Hh signaling pathway on oocyte maturation and early embryonic development is still controversial. We detected the effect of sonic hedgehog (Shh) and cyclopamine on the in vitro maturation of mouse oocytes and embryo development. The results showed that the presence of Shh or cyclopamine resulted in similar oocyte maturation to control groups. Shh did not improve early embryonic development. However, the supplement of cyclopamine depressed early embryo development. The mRNA of shh, ptch1, smo and gli1 were less detected in the denuded oocytes. The expression levels of ptch1 ascended from the uncleaved zygote to blastocyst stage. Smo or gli1 were expressed on a higher level at the two‐cell or four‐cell stage in early embryonic development separately. Therefore, Shh did not affect mouse oocyte maturation and early embryo development, but cyclopamine led to inhibited development of mouse early embryo. The effects of Hh signaling on the oocyte maturation and early embryo development might be species‐specific.  相似文献   

9.
Although androgen therapy resistance and poor clinical outcomes are seen in most canine prostate cancer cases, there are only a few tools for analysing canine prostate cancer by using a cell biological approach. Therefore, to evaluate androgen‐independent neoplastic cell growth, a new canine prostate cancer cell line (CHP‐1) was established in this study. CHP‐1 over‐expressed the co‐chaperone small glutamine‐rich tetratricopeptide repeat‐containing protein α (SGTA), which is over‐expressed in human androgen‐independent prostate cancer. The CHP‐1 xenograft also showed SGTA over‐expression. Although CHP‐1 shows poor androgen receptor (AR) signalling upon dihydrotestosterone stimulation, forced expression of AR enabled evaluation of AR signalling. Taken together, these results suggest that CHP‐1 will be a useful model for investigating the pathogenesis of androgen‐dependent and androgen‐independent canine prostate cancer.  相似文献   

10.
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11.
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12.
Only a few studies have described hormonal treatments for induction of synchronicity and gamete collection in Nile tilapia (Oreochromis niloticus), both important for assortative matings in breeding programmes and essential for polyploidy technologies. In this study, we compared the effectiveness of carp pituitary extract (CPE), Nile tilapia pituitary extract (TPE), human chorionic gonadotropin (hCG) and gonadotropin‐releasing hormone (GnRH) protocols on the induction of spawning and egg production in Nile tilapia. Among the hormonal treatments analysed, only hCG was effective for producing viable gametes for in vitro fertilization. To verify the viability of this hormonal treatment, hCG was tested using different doses (1000, 2000, 3000, 4000 and 5000 IU/kg) in a large number of females (208 animals) from two Nile tilapia lines. The results indicated that hCG doses between 1000 and 5000 IU/kg could be used to induce final oocyte maturation in Nile tilapia with collection of stripped oocytes. This is the first study to report differential reproductive responses to hormonal treatment between tilapia lines: line 1 was more efficient at producing eggs and post‐hatching larvae after hCG induction than line 2. In conclusion, we demonstrated that the hCG protocol may be applied on a large scale to induce final oocyte maturation in Nile tilapia. The development of a protocol for in vitro fertilization in Nile tilapia may aid in breeding programmes and biotechnological assays for the development of genetically modified lines of Nile tilapia.  相似文献   

13.
The effects of prolonged, intermittent infusion of β‐endorphin or naloxone into the third cerebral ventricle of follicular‐phase ewes on the expression of genes encoding GnRH and GnRHR in the hypothalamus and GnRHR in the anterior pituitary gland (AP) were examined by an enzyme‐linked immunoabsorbent assay. Activation or blockade of μ‐opioid receptors significantly decreased or increased the GnRH concentration and GnRHR abundance in the hypothalamus, respectively, and affected in the same way GnRHR quantity in the AP gland. The changes in the levels of GnRH and GnRHR after treatment with β‐endorphin as well as following action of naloxone were reflected in fluctuations of plasma LH concentrations. On the basis of these results, it is suggested that β‐endorphinergic system in the hypothalamus of follicular‐phase ewes affects directly or via β‐endorphin‐sensitive interneurons GnRH and GnRHR biosynthesis leading to suppression in secretory activity of the hypothalamic‐pituitary axis.  相似文献   

14.
A 1‐year‐old, previously spayed phenotypic female Poodle/Soft‐coated Wheaten Terrier (Whoodle) cross was presented for a suspected ovarian remnant. Serum luteinizing hormone (LH) concentration was below the detection limit (<1 ng/ml Witness® LH), and serum progesterone concentration was elevated in the chemiluminescence immunoassay (CLIA; 20 ng/ml), consistent with dioestrus and presence of ovarian tissue. Transabdominal ultrasound revealed a retroperitoneal soft tissue structure suspected to be a gonad. On exploratory laparotomy, a gonad was removed from the cranial retroperitoneum, cranial to the right kidney, after ligation of its primary blood supply. Histological examination proved the gonad to be an ovotestis. Subsequent cytogenetics revealed a 78 XX karyotype, thus confirming the diagnosis of ectopic ovotestis in a XX ovotesticular, SRY‐negative, disorder of sexual development in a dog.  相似文献   

15.
The aim of this study was evaluation of survivability, maturation rate and apoptotic gene expression of preantral follicles after vitrification and slow freezing technique. Normal mouse preantral follicles were randomly divided into three experimental groups. In the control group, follicles were cultured immediately; in the vitrification and slow freezing groups, follicles were cultured after vitrification‐warming and slow freezing‐thawing procedures. Follicular viability was assessed by using 0.4% trypan blue, and molecular evaluation of messenger RNA levels of apoptosis‐related genes was performed by the semi‐quantitative RT‐PCR method after 3 h of culture. Oocyte maturation rates were also evaluated on day 14 of culture. Survival and maturation rate in the slow freezing group were significantly lower than those in control and vitrification groups (P ≤ 0.05). Although there was no difference in Survivin expression among the three experimental groups, Bcl‐2 expression was significantly lower in the slow freezing group compared to the other groups (P ≤ 0.05). The expression of Bax, P53, Fas and Bax/Bcl‐2 ratio in the slow freezing group was significantly higher than control and vitrification groups (P ≤ 0.05). Preantral follicle vitrification seems to be better than slow freezing as seen in the survival, maturation and expression rates of apoptotic gene variants.  相似文献   

16.
Growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) are members of the transforming growth factor‐β (TGF‐β) family, and their roles in oocyte maturation and cumulus expansion are well known in the mouse and human, but not in the pig. We investigated GDF9 and BMP15 expressions in porcine oocytes during in vitro maturation. A significant increase in the mRNA levels of GDF9 and BMP15 was observed at germinal vesicle breakdown, with expression levels peaking at metaphase I (MI), but decreasing at metaphase II (MII). GDF9 and BMP15 protein localized to the oocyte cytoplasm. While treatment with GDF9 and BMP15 increased the expression of genes involved in both oocyte maturation (c‐mos, cyclinb1 and cdc2) and cumulus expansion (has2, ptgs2, ptx3 and tnfaip6), SB431542 (a TGFβ–GDF9 inhibitor) decreased meiotic maturation at MII. Following parthenogenetic activation, the percentage of blastocysts in SB431542 treatment was lower than in the control (41.3% and 74.4%, respectively). Treatment with GDF9 and BMP15 also increased the mRNA levels of maternal genes such as c‐mos [a regulatory subunit of mitogen‐activated protein kinase (MAPK)], and cyclinb1 and cdc2 [regulatory subunits of maturation/M‐phase‐promoting factor (MPF)]; however, SB431542 significantly decreased their mRNA levels. These data were supported by poly (A)‐test PCR and protein activity analyses. Our results show that GDF9 and BMP15 participate in cumulus expansion and that they stimulate MPF and MAPK activities in porcine oocytes during in vitro maturation.  相似文献   

17.
The objectives of present study were to evaluate the effect of casein kinase 1 (CK1) inhibition D4476 on in vitro maturation (IVM) and developmental competence of bovine oocytes. The cumulus oocyte complexes (COCs) were cultured in maturation medium with D4476 (0, 2, 5, 10, 20 μM) for 24 hr. After IVM and in vitro fertilization, through expansion average scores of cumulus cells (CCs), oocyte maturation efficiency, cleavage rate and blastocyst rate of zygote, we found 5 μM D4476 could increase the development potential of oocytes. After the COCs were treated with 5 μM D4476, the results of quantitative real‐time PCR analysis, Lichen red staining and PI staining showed that under without affecting germinal vesicle breakdown and nuclear morphology, D4476 could significantly decrease CK1 and upregulate TCF‐4 in oocytes. Furthermore, without influencing the level of Bad and CTSB, D4476 could significantly increase the expression of β‐catenin, TCF‐4, Cx43, MAPK, PTGS‐2, PTX‐3, TGS‐6, Bax and Bcl‐2 in CCs. Western blot analysis revealed that the addition of 5 μM D4476 during the maturation of COCs resulted in a lower level of Cx43 protein at 12 hr and a higher expression of Cx43 protein at 24 hr compared to the group without D4476. These results indicate that adding optimum D4476 (5 μM) to maturation medium is beneficial to maturity efficiency and development competence of bovine oocytes.  相似文献   

18.
This study examined the presence of immunoreactivity and mRNA for different nitric oxide synthase (NOS) isoforms in immature and in vitro matured oocytes and in embryos at two‐, four‐ and eight‐cell, and morula and blastocyst stages in buffalo. Oocytes obtained from slaughterhouse buffalo ovaries were subjected to in vitro maturation in TCM‐199 + 10% FBS + 5 μg/ml pFSH + 1 μg/ml estradiol‐17β + 0.81 mm sodium pyruvate + 10% buffalo follicular fluid + 50 μg/ml gentamycin sulphate for 24 h in a CO2 incubator (5% CO2 in air) at 38.5°C. Following in vitro fertilization carried out by incubating them with 2–4 million spermatozoa/ml for 18 h, the presumed zygotes were cultured in mCR2aa medium containing 0.6% BSA and 10% FBS for up to 8 days post insemination. Immunofluorescence staining of NOS using antibodies that cross‐reacted either with all the NOS isoforms i.e., universal (uNOS) or specifically with inducible (iNOS) or endothelial (eNOS) isoforms revealed that NOS was present in oocytes and embryos at all the stages examined. Examination of the semi‐quantitative expression of NOS genes by RT‐PCR revealed that the iNOS, eNOS and nNOS mRNA was present in the immature and mature oocytes and in all the embryonic stages examined. In conclusion, it was demonstrated in the present study that immunoreactivity and mRNA for different NOS isoforms was present in buffalo oocytes and pre‐implantation stage embryos.  相似文献   

19.
The aim of this study was to examine the effect of varying intracellular reactive oxygen species (ROS) levels during oocyte in vitro maturation with enzymatic ROS production systems (xanthine + xanthine oxidase or xanthine + xanthine oxidase + catalase), scavenger systems (catalase or superoxide dismutase + catalase) or cysteine on porcine oocyte maturation. Oocyte ROS levels showed an increase when H2O2 or O2?‐ production systems were added to the culture medium (p < 0.05). On the other hand, the presence of ROS scavengers in the maturation medium did not modify oocyte ROS levels compared with the control after 48 h of maturation, but the addition of cysteine induced a decrease in oocyte ROS levels (p < 0.05). The ROS production systems used in this work did not modified the percentage of oocyte nuclear maturation, but increased the decondensation of sperm head (p < 0.05) and decreased the pronuclear formation (p < 0.05). In turn, the addition of O2?‐ and H2O2 scavenging systems during in vitro maturation did not modify the percentage of oocytes reaching metaphase II nor the oocytes with decondensed sperm head or pronuclei after fertilization. However, both parameters increased in the presence of cysteine (p < 0.05). The exogenous generation of O2?‐ and H2O2 during oocyte in vitro maturation would not affect nuclear maturation or later sperm penetration, but most of the spermatozoa cannot progress to form the pronuclei after fusion with the oocyte. The decrease in endogenous ROS levels by the addition of cysteine would improve pronuclear formation after sperm penetration.  相似文献   

20.
This study was designed to determine whether any relationship exists between exposure to artificial long days, milk yield, maternal plasma insulin‐like growth factor 1 (IGF‐1) levels, and kid growth rate in goats. One group of lactating goats was maintained under naturally decreasing day length (control group; n = 19), while in another one, they were kept under artificial long days (LD group; n = 19). Milk yield was higher in goats from the LD group than that in the control group (P < 0.05). Maternal IGF‐1 levels at day 57 of lactation were higher (P < 0.05) in goats from the LD group than the levels in the control group and were positively correlated with the total milk yields per goat at days 43 and 57 of lactation (r = 0.77 and r = 0.84, respectively; P < 0.01). Daily weight gain at week 4 was higher (P < 0.01) in kids from the LD group than that in kids from the control group and was correlated with total and average IGF‐1 maternal levels (r = 0.60 and r = 0.60, P < 0.05). It was concluded that submitting lactating goats to artificial long days increases milk yield, plasma IGF‐1 maternal levels and the growth rate of the kids.  相似文献   

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