Selection of bovine oocytes by brilliant cresyl blue staining: effect on meiosis progression, organelle distribution and embryo development

Zygote ◽  
2011 ◽  
Vol 21 (3) ◽  
pp. 250-255 ◽  
Author(s):  
D.S. Silva ◽  
P. Rodriguez ◽  
A. Galuppo ◽  
N.S. Arruda ◽  
J.L. Rodrigues
Keyword(s):  
Embryo Development ◽  
Polar Body ◽  
Blue Staining ◽  
Cortical Granule ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Cytoplasmic Maturation ◽  
Bovine Oocytes ◽  
Selection Of

SummaryThe selection of competent oocytes for in vitro maturation is still a major problem during bovine in vitro embryo production. Markers for in vitro cytoplasmic maturation, based on the organization of cortical granule and mitochondria, are lacking. We examined the pre-selection of immature bovine oocytes by brilliant cresyl blue stain (BCB test) based on glucose-6-phosphate dehydrogenase (G6PDH) activity during oocyte development. Oocytes were recovered from ovarian follicles exposed to 26 μM BCB stain and classified according to the aspect of their cytoplasm: BCB+ (oocytes with blue cytoplasm) and BCB− (unstained cytoplasm) and then in vitro matured into a conventional in vitro maturation (IVM) medium and standard procedure. In Experiment 1, nuclear maturation was determined by polar body identification, while cytoplasmic maturation was based on cortical granule (CG) migration (peripheral) and mitochondria distribution (central). Evidence of polar body, cortical granule migration and of centrally located mitochondria was significantly (p < 0.05) higher in BCB+ oocytes than in BCB− (polar body present: 65% vs 20%; peripheral CG: 72% vs. 14%; and central mitochondria: 85% vs. 19%, respectively). In Experiment 2, the efficiency pre-selection of bovine oocytes by BCB on embryo development in vitro was assessed. Cleavage rates were similar (75%) among control, BCB+ and BCB− groups, while blastocyst rates on D7 were (p < 0.05) higher (35%) in BCB+ vs BCB− (10%) or control (28%). We showed that the BCB test is efficient to identify competent immature bovine oocytes to undergo synchronous nuclear and cytoplasmic in vitro maturation thus yielding higher in vitro embryo development to blastocyst stage.

315 SELECTION OF BOVINE OOCYTES BY BRILLIANT CRESYL BLUE BEFORE IN VITRO MATURATION IMPROVES BLASTOCYST DEVELOPMENT

2007 ◽  
Vol 19 (1) ◽  
pp. 273 ◽  
Author(s):  
A. Sugulle ◽  
S. Katakawa ◽  
S. Yamamoto ◽  
S. Oomori ◽  
I. Itou ◽  
...  
Keyword(s):  
Embryo Development ◽  
In Vitro Maturation ◽  
Control Group ◽  
Blastocyst Development ◽  
Cell Stage ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Bovine Oocytes ◽  
Selection Of

The morphological identification of immature oocytes has commonly been used to select the bovine oocytes for IVF. However, &lt;30% of the recovered oocytes reach the blastocyst stage after fertilization, and this is probably due to the quality of the oocytes at the beginning of maturation. The brilliant cresyl blue (BCB) stain determines the activity of glucose-6-phosphate dehydrogenase, an enzyme synthesized in growing oocytes. The aim of this study was to evaluate the effect of the BCB stain on the selection of bovine oocytes and on the subsequent embryo development for in vitro production (IVP). Cumulus–oocyte complexes (COCs) were collected by the aspiration of 2- to 6-mm follicles. A total of 559 oocytes were divided into 2 groups: (1) a control group, immediately cultured, and (2) a BCB-incubated group. After 90 min of BCB staining (Pujol et al. 2004 Theriogenology 61, 735–744), the oocytes were divided into oocytes with blue cytoplasm (BCB+) and oocytes without blue cytoplasm (BCB−). The COCs were matured for 20 h in TCM-199 supplemented with 5% calf serum (CS) and 0.02 mg mL−1 FSH at 38.5°C under an atmosphere of 5% CO2 in air. The matured COCs were inseminated with 5 × 106 sperm mL−1. After 18 h of gamete co-culture, the presumed zygotes were cultured in CR1aa supplemented with 5% CS for 9 days at 38.5°C under an atmosphere of 5% CO2, 5% O2, and 90% N2. Embryonic development was evaluated at 48 h after IVF (proportion of ≥5-cell stage, the total cleavage rates) and on Days 7 to 9 (blastocyst rate). The experiment was replicated 5 times, and the data were analyzed by a chi-square test and ANOVA. The results are presented in Table 1. The proportion of embryos with ≥5-cell stage was significantly higher (P &lt; 0.01) in the BCB+ group than in the BCB− group, but not in the control group. The total cleavage rate for the BCB+ embryos was significantly higher than that of either the BCB− or the control group (P &lt; 0.01). There were also significant differences (P &lt; 0.01) in the blastocyst development between the BCB+ and BCB− embryos and between the BCB− and the control embryos (P &lt; 0.05). This result showed that the selection of bovine oocytes by BCB staining before in vitro maturation may be useful for selecting oocytes that are developmentally competent up to Day 9 for IVP. Table 1.Effect of selection of oocytes by brilliant cresyl blue (BCB) staining on the subsequent embryo development of in vitro-matured/in vitro-fertilized bovine embryos

scholarly journals Effect of adding growth factors during in vitro maturation on the developmental potentials of ewe oocytes selected by brilliant cresyl blue staining

2021 ◽  
Vol 14 (2) ◽  
pp. 452-456
Author(s):  
Mohamed Fathi ◽  
Amr F. Elkarmoty
Keyword(s):  
Growth Factors ◽  
Growth Factor ◽  
Embryo Development ◽  
In Vitro Maturation ◽  
Blue Staining ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Nuclear Maturation ◽  
Maturation Medium

Aim: Several factors had been concerned with the developmental competence of the sheep oocyte. This study aims to investigate the effect of adding growth factors (insulin-like growth factor 1 [IGF-1] and epidermal growth factor [EGF]) in the maturation medium of ewe oocytes selected based on brilliant cresyl blue (BCB) screening on in vitro maturation (IVM), fertilization, and pre-implantation embryo development. Materials and Methods: Cumulus-oocyte complexes (COCs) were obtained from the ovaries of slaughtered ewes by either aspiration or slicing techniques. COCs were in vitro matured in a medium containing IGF-1 and EGF (control group). For BCB screening, oocytes were stained and divided into BCB+ oocytes that matured in the same maturation conditions without adding growth factors (Group 2) or in the presence of growth factors (Group 3), and BCB– oocytes that matured in medium without growth factors (Group 4) or with growth factors (Group 5). Results: The supplementation of the maturation medium with growth factors during IVM of (BCB+) oocytes resulted in a significant increase in nuclear maturation rate (90.9%), fertilization rate (75.6%), and embryo developmental rates (60.0%, 46.7%, and 33.3% for cleavage, morula, and blastocyst, respectively). Conclusion: Culturing BCB+ oocytes in a maturation medium containing both EGF and IGF-1 showed a significant improvement in nuclear maturation, fertilization, and pre-implantation embryo development in vitro.

293 EFFECT OF DIFFERENT CONCENTRATIONS OF LH, FSH, AND E2 ON THE MATURATIONAL RATE OF INDIGENOUS SOUTH AFRICAN CATTLE OOCYTES SELECTED BY BRILLIANT CRESYL BLUE STAINING

2015 ◽  
Vol 27 (1) ◽  
pp. 235
Author(s):  
K. P. M. Lekola ◽  
J. W. Ng'ambi ◽  
N. Nkadimeng ◽  
M. L. Mphaphathi ◽  
T. L. Nedambale
Keyword(s):  
South African ◽  
In Vitro Maturation ◽  
Polar Body ◽  
Blue Staining ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
African Cattle ◽  
Maturation Medium ◽  
Maturation Rate

In vitro maturation of indigenous African cattle oocytes is a major challenge even though different maturation protocols work successfully in other breeds. The objective of this study was to determine the maturation rate of indigenous South African cattle oocytes following in vitro maturation in media supplemented with different concentrations of hormones and selected using brilliant cresyl blue (BCB) staining. Indigenous cattle ovaries were collected from the slaughterhouse and then oocytes were retrieved by aspiration method. A total of 966 oocytes were exposed to 26 µM BCB stain and 700 oocytes were not exposed to the BCB stain. Thereafter, oocytes exposed to the BCB stain were grouped according to the colour of their cytoplasm BCB+ (oocytes with blue cytoplasm, low G6PDH) and BCB– (unstained oocytes, increased G6PDH). The BCB exposed (BCB+ and BCB–) and the oocytes not exposed to BCB were then randomly allocated into tissue culture medium (TCM199) + 10% (vol/vol) fetal bovine serum (FBS) supplemented with 3 different concentrations of hormones as treatments (T). The T1 group was matured in the presence of 0.5 µg mL–1 of FSH, 5 mg mL–1 of LH, and 2 µg mL–1 of E2; the T2 group was matured in the presence of 1 µg mL–1 of FSH, 6 mg mL–1 of LH, and 2.5 µg mL–1 of E2; and the T3 group was matured in the presence of 1.5 µg mL–1 of FSH, 7 mg mL–1 of LH, and 4.5 µg mL–1 of E2. For IVM, 20 to 25 COC were placed in 50-µL droplets of IVM medium containing the 3 different levels of hormones. Maturation rate of oocytes was determined by the extrusion of the first polar body after 24 h of incubation in maturation medium. Data was analysed by ANOVA using SAS with 4 replicates per treatment. Treatment 2 yielded higher maturation rate for both BCB+ (65.6%) and not exposed to BCB (60.3%) oocytes compared to T1 (22, 3.03, and 16% for BCB+, BCB–, and not exposed to BCB, respectively) and T3 (48, 2.2, and 48% for BCB+, BCB–, and not exposed to BCB respectively). However, BCB– oocytes had lower polar body extrusion for T1, T2, and T3 (3.03, 8.1, and 2.2%, respectively) compared to BCB+ oocytes (22, 65.6, and 48% for T1, T2, and T3, respectively). In conclusion, immature oocytes that were cultured into TCM199 supplemented with 10% FBS, 1 µg mL–1 of FSH, 6 mg mL–1 of LH, and 2.5 µg mL–1 of E2 showed maturation rate for BCB+ oocytes and those not exposed to BCB. Oocytes selection using BCB staining was a useful test to classify good quality cattle oocytes. Therefore, it is suggested that treatment 2 is a suitable in vitro-maturation medium to mature indigenous South African cattle oocytes.

Selection of Rattus norvegicus oocytes for in vitro maturation by brilliant cresyl blue staining

Zygote ◽  
2011 ◽  
Vol 21 (3) ◽  
pp. 238-245 ◽  
Author(s):  
Diego Duarte Alcoba ◽  
Bianca Letícia da Rosa Braga ◽  
Nathallie Louise Sandi-Monroy ◽  
Letícia Auler Proença ◽  
Rui Fernando Felix Lopes ◽  
...  
Keyword(s):  
Rattus Norvegicus ◽  
Blue Staining ◽  
Control Group ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Nuclear Maturation ◽  
Effective Evaluation ◽  
Maturation Rate ◽  
Selection Of

SummaryThe objective of this work was to evaluate the rate of meiosis resumption and nuclear maturation of rat (Rattus norvegicus) oocytes selected for in vitro maturation (IVM) after staining of cumulus–oocyte complexes (COCs) with blue cresyl brilliant (BCB) using different protocols: exposure for 30, 60 or 90 min at 26 μM BCB (Experiment 1), and exposure for 60 min at 13, 20 or 26 μM BCB (Experiment 2). In Experiment 1, the selection of oocytes exposed to BCB for 60 min was found to be the most suitable, as meiosis resumption rates in the BCB+ group (n = 35/61; 57.37%) were the closest to the observed in the control (not exposed) group (n = 70/90; 77.77%) and statistically higher than the values observed for the BCB− group (n = 3/41; 7.32%). Additionally, the more effective evaluation of diagnostic tests (sensitivity and negative predictive value 100%) was observed in COCs exposed for 60 min. In Experiment 2, the 13 μM BCB+ group presented rates of meiosis resumption (n = 57/72; 72.22%) similar to the control group (n = 87/105; 82.86%) and higher than other concentration groups. However, this results of the analysis between BCB− oocytes was also higher in the 13 μM BCB group (n = 28/91; 30.78%) when compared with BCB− COCs exposed to 20 μM (n = 3/62; 4.84%) or 26 μM (n = 3/61; 4.92%) BCB. The nuclear maturation rate in the 13 μM BCB group was similar between BCB+ or BCB− oocytes. The 20 μM BCB group had a lower rate of nuclear maturation of BCB− oocytes than other groups. Thus, our best results in the selection of Rattus norvegicus oocytes by staining with BCB were obtained using the concentration of 13 μM and 20 μM, and an incubation period of 60 min.

scholarly journals Resveratrol supplementation during in vitro maturation improves embryo development of prepubertal goat oocytes selected by brilliant cresyl blue staining

2019 ◽  
Vol 65 (2) ◽  
pp. 113-120 ◽  
Author(s):  
Anna-Rita PIRAS ◽  
Irene MENÉNDEZ-BLANCO ◽  
Sandra SOTO-HERAS ◽  
Maria-Gracia CATALÁ ◽  
Dolors IZQUIERDO ◽  
...  
Keyword(s):  
Embryo Development ◽  
Blue Staining ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue

scholarly journals Selection of oocytes for in vitro maturation by brilliant cresyl blue staining: a study using the mouse model

Cell Research ◽  
2007 ◽  
Vol 17 (8) ◽  
pp. 722-731 ◽  
Author(s):  
Yan-Guang Wu ◽  
Yong Liu ◽  
Ping Zhou ◽  
Guo-Cheng Lan ◽  
Dong Han ◽  
...  
Keyword(s):  
Mouse Model ◽  
In Vitro Maturation ◽  
Blue Staining ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Selection Of

316 DEVELOPMENTAL COMPETENCE OF OOCYTES SELECTED BY THE BRILLIANT CRESYL BLUE STAINING IN PREPUBERTAL AND ADULT CATTLE

2007 ◽  
Vol 19 (1) ◽  
pp. 273 ◽  
Author(s):  
M. Tagawa ◽  
S. Matoba ◽  
M. Okada ◽  
K. Metoki ◽  
K. Imai
Keyword(s):  
Farm Animals ◽  
Blue Staining ◽  
Blastocyst Formation ◽  
Adult Cattle ◽  
Brilliant Cresyl Blue ◽  
Cresyl Blue ◽  
Significant Difference ◽  
The Mean ◽  
Selection Of

Transvaginal ultrasound guided ovum pickup (OPU) can be carried out repeatedly not only in adult cows but also in prepubertal calves. Moreover, recently the brilliant cresyl blue (BCB) staining has been used successfully to select oocytes homologous stained with BCB as an indirect measure of oocyte growth for in vitro fertilization (IVF) in several farm animals. The aim of this study was to evaluate the effectiveness of BCB staining on the selection of developmentally competent oocytes, collected from cows and calves by OPU, before in vitro maturation by assessing the embryonic development to the blastocyst stage after IVM/IVF. OPU was performed once weekly for a period of 7 weeks on Japanese Black prepubertal calves (9 months old, n = 4) and adult cows (n = 4) without gonadotropin stimulation. Calf and cow oocytes with homogeneous cytoplasm were exposed to 26 �M BCB for 90 min and classified according to their cytoplasmic coloration: blue coloration (BCB+) or colorless (BCB-). Classified oocytes were then matured for 20 h in TCM-199 supplemented with 5% calf serum (CS). Matured oocytes were inseminated with Percoll-separated spermatozoa (3 � 106 mL) for 6 h in BO solution supplemented with 5 mM hypotaurine and 2 U mL-1 heparin. Presumptive zygotes were cultured in CR1aa supplemented with 5% CS for 8 days. Data were analyzed by Student&apos;s t-test. The mean (&plusmn; SEM) percentage of oocytes classified as BCB&plus; in calves was significantly lower than that in cows (34.4 &plusmn; 2.9&percnt; and 69.2 &plusmn; 2.1&percnt;, respectively; P &lt; 0.01). In cows, BCB&plus; oocytes showed significantly higher cleavage and blastocyst formation percentages (72.5&percnt; and 42.4&percnt;, respectively) than those of BCB&minus; oocytes (47.0&percnt; and 13.0&percnt;, respectively). In contrast, in calves there were no significant differences in cleavage and blastocyst formation percentages between BCB&plus; oocytes (56.9&percnt; and 25.3&percnt;, respectively) and BCB&minus; oocytes (65.4&percnt; and 22.4&percnt;, respectively). The mean (&plusmn; SEM) numbers of usable oocytes and blastocysts obtained per calf (19.0 &plusmn; 1.5 and 4.5 &plusmn; 0.6, respectively) were similar to those obtained per cow (16.4 &plusmn; 1.1 and 5.2 &plusmn; 0.6, respectively). No significant difference was observed in the numbers between calves and cows. These results indicate that the selection of developmentally competent oocytes before IVM/IVF, using the BCB staining, was effective for cow oocytes but not for calf oocytes, and that blastocysts could be produced by OPU-IVF of oocytes from 9-month-old prepubertal calves at an efficiency equivalent to that achieved from adult cows.

scholarly journals Effects of various concentrations of gonadotropins and 17β estradiol on the in vitro maturation of cattle oocytes selected using brilliant cresyl blue staining

1970 ◽  
Vol 46 (3) ◽  
pp. 321-326
Author(s):  
K.P.M. Lekola ◽  
J.W. Ng’ambi ◽  
M. Nkadimeng ◽  
M.L. Mphaphathi ◽  
T.L. Nedambale
Keyword(s):  
In Vitro Maturation ◽  
Polar Body ◽  
Blue Staining ◽  
Brilliant Cresyl Blue ◽  
Immature Oocytes ◽  
Cresyl Blue ◽  
Polar Bodies ◽  
First Polar Body ◽  
Maturation Rate

The objective of this study was to determine the in vitro maturation rate of cattle oocytes selected with brilliant cresyl blue (BCB) stain, in tissue culture medium 199 (TCM 199) supplemented with various concentrations of hormones. Oocytes were retrieved from abattoir-derived ovaries by aspiration. Oocytes were then exposed to 26 μM BCB stain, and classified according to the colour of their cytoplasm: BCB+ (oocytes with blue cytoplasm) and BCB- (unstained oocytes). The BCB selected and the non-selected immature oocytes were randomly allocated into TCM 199 + 10% foetal bovine serum (FBS) maturation media supplemented with three concentrations of hormones as treatments (T). The T1 group was matured in the presence of 0.5 μg follicle stimulating hormone (FSH)/mL, 5 mg luteinising hormone (LH)/mL and 2 μg estradiol (E2)/mL. The T2 group was matured in 1 μg FSH, 6 mg LH and 2.5 μg E2/mL. The T3 group was matured in 1.5 μg FSH, 7 mg LH and 4.5 μg E2/mL. The maturation rate of oocytes was determined by the protrusion of the first polar bodies 24 h after maturation. Data were analysed by ANOVA using SAS. Treatment 2 yielded higher maturation rates for with BCB+ (30.5%) and without BCB (35%) oocytes, with T1 giving a lower maturation rate for BCB+ (10.7%) and without BCB (9.7%) oocytes. However, BCB- oocytes had lower polar body extrusion (0.7%, 1% and 2.7%) for T1, T2 and T3, respectively. In conclusion, immature oocytes that were exposed to BCB+ and cultured in TCM 199 supplemented with 10% FBS, 1 μg FSH, 6 mg LH and 2.5 μg E2/mL had a higher number of matured oocytes (extrusion of first polar body), similar to those that were not exposed to BCB (no BCB). Oocyte selection with BCB staining was a useful test for classifying good-quality cattle oocytes.

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