133 EFFECT OF PROGESTERONE SUPPLEMENTATION OF MATURATION MEDIUM ON THE DEVELOPMENT OF IN VITRO-MATURED-IN VITRO-FERTILIZED-IN VITRO-CULTURED BOVINE EMBRYOS

The objective of this study was to investigate whether progesterone (P4) supplementation to in vitro maturation (IVM) medium could affect the competence of bovine oocyte to develop into blastocysts in vitro. Cumulus–oocyte complexes (COC) were collected by aspiration of ovarian follicles (2 to 6 mm in diameter) obtained from a local abattoir. The COC were matured for 20 h in TCM-199 supplemented with 5% calf serum and 0.02 AU mL–1 FSH at 38.5° in an atmosphere of 5% CO2 in air. After 18 h of gamete co-culture (5 × 106 sperms mL–1), presumptive zygotes were cultured in CRlaa containing 5% calf serum at 38.5°C in an atmosphere of 5% CO2, 5% O2, and 90% N2 for 9 days (fertilization = Day 0). Progesterone was added to the IVM medium 10 h after the start of the culture (1 μg group = 1 μg mL–1 of P4; 5 μg group = 5 μg mL–1 of P4; control group = no P4). The maturation (MII) rates were investigated after 20 h of starting the IVM culture. After maturation, the COC were denuded mechanically, and a part of the oocytes were mounted on slides, fixed with aceto-alcohol (1 : 3) solution for 48 h, stained with aceto-orcein, and observed under a phase-contrast microscope to determine their nuclear status (1 μg group: n = 32; 5 μg group: n = 28; control group: n = 31). The remaining COC were used for IVF. The cleavage rates were investigated on day 2, and the blastocyst formation rates were investigated on Days 7 to 9, respectively (1 μg group: n = 264; 5 μg group: n = 274; control group: n = 277). The blastocysts from Day 7 were used for differential staining of the inner cell mass (ICM) and trophectoderm cells (TE). The total cell numbers, ICM, and TE in the blastocysts were counted (1 μg group: n = 28; 5 μg group: n = 24; control group: n = 24). The rates of MII, cleavage, and blastocyst formation were expressed and analysed by the chi-squared test. Each set of cell numbers (mean ± standard error) was analysed by the unpaired t-test. The MII rate in the control group (76.7%) was significantly lower (P < 0.05) than that in the 1 μg group (93.8%). The cleavage rate in the 1 μg group (85.6%) was significantly higher (P < 0.05) than those in the control group (74.7%) and 5 μg group (77.4%). Further, the blastocyst formation rate in the 1 μg group (47.7%) and 5 μg group (43.4%) were significantly higher (P < 0.05) than that in the control group (35.0%). The ICM numbers (mean ± s.e.) were 39.5 ± 13.8 to 36.2 ± 8.9, the TE numbers were 74.4 ± 22.4 to 66.2 ± 12.9, the total cell numbers of blastocysts were 110.6 ± 28.2 to 103.0 ± 13.8. There was no significant difference in cell numbers among the groups. These results indicate that the cleavage and blastocyst formation rates can be improved by the addition of 1 μg mL–1 of P4 to the maturation medium.

Short communication: effects of serum obtained from dairy cows with low or high body condition score on in vitro embryo development

The objective of the study was to determine whether the serum obtained from animals differing in body condition score (BCS) affects in vitro embryo development. After in vitro fertilization, serum obtained from dairy cows of either low (L-BCS; 2.1 ± 0.14 on a scale of 1 to 5) or high BCS (H-BCS; 4.0 ± 0.0), or commercially available bovine serum (control) was added at 5% concentration to the in vitro culture medium. Use of serum obtained from H-BCS cows increased the cleavage rates compared with control serum at both 24 and 48 h after in vitro fertilization (78.3 vs. 71.9% and 79.9 vs. 75.1%, respectively), whereas use of serum obtained from L-BCS cows increased the blastocyst rate compared with control serum at 7d (23.8 vs. 19.1%), but this difference was not evident at 8 or 9 d after in vitro fertilization. As nonesterified fatty acid concentrations were highest in control serum, followed by serum from L-BCS and H-BCS cows (621, 559, and 272 μEq/L, respectively), a high concentration of nonesterified fatty acids might adversely affect the very early stages of embryo development, and its negative effects might be greater immediately after fertilization compared with developmental stages after morula formation. Our findings also indicate that factors promoting early stage embryo development do not necessarily promote blastocyst development. Serum obtained from animals under different physiological conditions may be used for in vitro embryo culture to study the effects of nutritional management of dairy cattle on embryo development.

Noninvasive clinical assessment of systolic torsional motions by two-dimensional speckle-tracking echocardiography in dogs with myxomatous mitral valve disease

BACKGROUND

Left ventricular torsional motion plays an important role for effective pump function. However, noninvasive clinical assessment of torsional deformations by two-dimensional speckle-tracking echocardiography (2D-STE) in dogs with myxomatous mitral valve disease (MMVD) has not been reported.

HYPOTHESIS

Left ventricular torsion is determined by the native orientation of the helical myocardial fibers, such that it might provide better assessment of myocardial function than conventional methods.

ANIMALS

Sixty-seven client-owned dogs with MMVD were classified into 3 classes based on the International Small Animal Cardiac Health Council classification and 16 weight- and age-matched healthy dogs.

METHODS

Dogs were examined for myocardial deformations by 2D-STE and were evaluated for peak systolic rotation and rotation rate at each basal and apical view. Dogs also were evaluated for peak systolic torsion and torsion rate.

RESULTS

Peak systolic torsion was higher in class II than in class I (P < .001) dogs. Peak systolic torsion was lower in class III than in class II (P = .001) dogs and controls (P = .003).

CONCLUSIONS AND CLINICAL IMPORTANCE

Torsional deformations assessed by 2D-STE differed among clinical classes of MMVD. Myocardial torsional deformations by 2D-STE may provide more detailed assessment of contractile function in dogs with MMVD.

Three-dimensional airway lumen volumetry: comparison with bronchial wall area and parenchymal densitometry in assessment of airway obstruction in pulmonary emphysema

OBJECTIVES

The purpose of this study was to compare three-dimensional airway lumen volumetry with bronchial wall area and parenchymal densitometry in the assessment of airway obstruction in pulmonary emphysema.

METHODS

56 patients, who were smokers, underwent CT examination and pulmonary function tests (PFTs). For quantitative assessments, the following parameters were computationally calculated: (1) percentage of voxels -950, -960 and -970 HU in the lung (%LAA(-950), %LAA(-960) and %LAA(-970), respectively); (2) percentage of partial bronchi luminal volumes per total luminal volumes (LV(main), main and distal bronchial volume/total luminal volume; LV(lobe), lobar and distal bronchial volume/total luminal volume); and (3) mean wall area percentages of segmental bronchi of the right apical and left apicoposterior segment (WA%(seg)) and of subsegmental bronchi (WA%(sub)) in the upper lobes. These parameters were correlated with PFTs and statistically compared between a chronic obstructive pulmonary disease (COPD) group [forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC)<70] and a non-COPD group.

RESULTS

FEV1, maximum mid-expiratory flow rate and forced expiratory flow at 25% vital capacity had significant correlation with LV(main) (r>0.53, p<0.0001), LV(lobe) (r>0.52, p<0.0001), WA%(seg) (|r|>0.29, p<0.05) and WA%(sub) (|r|>0.31, p<0.05). FEV1/FVC had significant correlation with all parameters (0.27<|r|<0.52, p<0.05). LV(main) and LV(lobe) and WA%(seg) and WA%(sub) were significantly different between the two groups (LV(main) and LV(lobe); p<0.0001, WA%(seg) and WA%(sub); p<0.05).

CONCLUSIONS

Bronchial luminal volumetric assessment better reflected the airflow limitation parameters.

ADVANCES IN KNOWLEDGE

Bronchial luminal volumetric assessment can potentially be used to gauge airflow limitation in pulmonary emphysema.

166 EFFECT OF INDIVIDUAL CULTURE SYSTEM ON IN VITRO DEVELOPMENT OF IN VITRO-MATURED - IN VITRO-FERTILIZED BOVINE EMBRYOS

An individual in vitro culture system for bovine embryo needs to be developed for the study of embryo developmental competence. The objective of this study was to examine the effect of individual culture systems on the development of in vitro-matured–in vitro-fertilized bovine embryos. Two individual culture systems were compared. Cumulus–oocyte complexes (COC) were collected by aspiration of ovarian follicles (diameter, 2 to 5 mm) obtained from a local abattoir. The COC were matured in TCM-199 supplemented with 5% calf serum and 0.02 AU mL–1 of FSH. Groups of 20 COC were incubated in 100-μL droplets of IVM media at 38.5°C under an atmosphere of 5% CO2 for 20 h. After 18 h of gamete co-culture (3 × 106 sperm mL–1), the presumptive zygotes were cultured in CR1aa medium supplemented with 5% calf serum at 38.5°C under an atmosphere of 5% CO2, 5% O2 and 90% N2 for 9 days (fertilization = Day 0). The presumptive zygotes were randomly assigned to 1 of the following 3 treatments: single culture (1 zygote was cultured in a 5-μL droplet), well-of-the-well (WOW; Sugimura et al. 2010 Biol. Reprod. 83, 970–978) culture (25 zygotes were cultured individually in each 125-μL droplet) and control culture (25 zygotes were cultured in a 125-μL droplet). Embryo development was evaluated for cleavage and blastocyst rates, on Day 2 and Day 7 to 9 after IVF, respectively. The rates of development up to the blastocyst stage and total cell number in the blastocysts, determined by an air-drying method, were investigated. The cleavage and blastocyst rates were analysed by the chi-square test and the total cell numbers were analysed by ANOVA. The cleavage rates were significantly higher in the control and WOW groups than in the single-culture group (P < 0.01) and the blastocyst rates were significantly lower in the single-culture group than in the control culture group (P < 0.05; Table 1). The total cell numbers (mean ± s.d.) of blastocysts did not significantly differ between the single culture (154.6 ± 21.8), control culture (155.2 ± 22.5) and WOW culture (159.8 ± 27.0) groups. These results indicate that although the blastocyst rate was lower in the single-culture system than in the WOW or group culture system, in vitro-matured–in vitro-fertilized bovine embryos can be cultured using the single-culture system. Moreover, the quality of blastocysts developed by the single-culture system is the same as that of blastocysts developed using the other 2 culture systems. Table 1.Effect of different culture methods for bovine embryo development

165 THE EFFECTS OF L-CARNITINE AND LINOLEIC ACID ALBUMIN SUPPLEMENTATION ON THE DEVELOPMENT AND CRYOSURVIVAL OF BOVINE IN VITRO-MATURED/IN VITRO-FERTILIZED EMBRYOS IN IN VITRO CULTURE MEDIUM

The objective of this study was to investigate the effects of the supplementation of a lipid metabolism inducer, L-carnitine (LC) and a membrane stabilizer, linoleic acid albumin (LAA), on the developmental competence and cryosurvival of bovine in vitro-matured/in vitro-fertilized embryos in in vitro culture medium. Cumulus–oocyte complexes collected from the ovaries of slaughtered cattle were matured for 20 h in TCM-199 supplemented with 5% calf serum (CS) and 0.02 AU mL–1 of FSH at 38.5°C in an atmosphere of 5% CO2 in air. After IVF (Day 0), presumptive zygotes were cultured in CRlaa containing 5% CS at 38.5°C in an atmosphere of 5% CO2, 5% O2 and 90% N2 for 9 days. The culture medium was supplemented with 0.6 mg mL–1 of LC (LC group; n = 180) or with 0.25 mg mL–1 of LAA (LAA group; n = 180) or with both LC and LAA (LC + LAA group; n = 180) or without LC and LAA (control; n = 178). The cleavage rates were recorded on Day 2 and the blastocyst formation rates were recorded on Day 7 to 9. Expanded blastocysts harvested on Day 7 and 8 (LAA group: n = 31; LC group: n = 29; LC + LAA group: n = 25; control group: n = 33) were used for freezing in modified PBS supplemented with 1.5 M ethylene glycol, 0.1 M sucrose and 20% CS. After thawing, they were cultured in TCM-199 supplemented with 20% FBS and 0.1 mM β-mercaptoethanol at 38.5°C under 5% CO2 in air for 72 h. The rates of re-expansion, hatching and formation of hatched blastocysts were determined at 24, 48 and 72 h after thawing, respectively. The rates of cleavage and blastocyst formation were expressed as mean ± s.e.m. and analysed by ANOVA. The post-thaw survival rates of frozen embryos were analysed by chi-square test. The cleavage rate in the control group (69.1 ± 2.5%) was significantly lower than that in the LAA (81.8 ± 3.8%) and LC + LAA groups (77.9 ± 1.4%) but did not differ from that in the LC group (73.8 ± 2.4%). The blastocyst formation rate in the control group (21.7 ± 2.8%) was significantly lower (P < 0.05) than those in the LAA and LC + LAA groups (33.5 ± 2.8% and 31.4 ± 2.4%, respectively), but it did not differ significantly from that of the LC group (32.1 ± 3.3%) despite a strong tendency (P = 0.06). There were no significant differences among the control, LC, LAA and the LC + LAA groups in post-thaw re-expansion rates (66.7, 75.9, 67.7 and 76.0%, respectively), hatching rates (48.5, 69.0, 58.1 and 64.0%, respectively) and rates of formation of hatched blastocysts (51.5, 62.1, 61.3 and 64.0%, respectively). These results indicate that the addition of LC and LAA to the medium for in vitro culture of in vitro-matured/in vitro-fertilized bovine embryos improved their ability to develop to the blastocyst stage; however, the effects on the freezing tolerance were not verified.

77 REPRODUCTIVE PERFORMANCE OF DAIRY COWS DIFFERING IN THE INTERVAL FROM CALVING TO THE FIRST OVULATION IN THE POSTPARTUM PERIOD

In recent years, reproductive performance of dairy cows has declined worldwide. The reproductive characteristics of dairy cows should be evaluated to improve their fertility. Dochi et al. (2010) had reported that dairy cows that exhibited early first ovulation gave a low milk yield, had an early recovery of body condition score (BCS) in the postpartum period and a shorter number of days open. The objective of this study was to evaluate the effect of BCS on the functional recovery of reproduction after the birth of the calves. In this study, lactating Holstein cows were placed in free-stall housing equipped with an automatic milking system. The data presented in this study were collected from 48 cows that had calved between December 2007 and October 2010 with an average parity of 3.4 (range 2–6). The reproductive performance and the BCS during the different intervals between calving and the first ovulation were analysed using ANOVA. The conception rate at the first service was 38.1%. The average milk yield (305 days) was 12 299 kg. The first ovulation and oestrus were determined by ultrasonography. The results of the different intervals to the first ovulation are presented in Table 1. The average interval from the start of days in milk (DIM) to the first ovulation, first oestrus and first service; the number of days open; the number of services per conception and the milk yield (kg day–1, by 90 DIM) were 37.4, 54.7 and 110.3 days; 168.2 days open; 2.5 times; and 42.1 kg day–1, respectively. The cows that exhibited early first ovulation (≤21 DIM) in the postpartum period had significantly shorter intervals between the start of DIM and the first oestrus (P < 0.01). However, the days to first service, the number of days open, the number of services per conception and the milk yield (kg day–1, by 90 DIM) did not differ significantly. The BCS in the peripartum period of different intervals to the first ovulation decreased from 3.1 to 2.4 by 150 DIM. This study showed that average BCS of preparturient 50–10 DIM is 3.0. Moreover, the average BCS of parturition is declining to 2.5 (parturition from 70 to 150 DIM). The cows became pregnant after an increase in the BCS (>150 DIM). In conclusion, these results suggest that the delay to the first ovulation in the postpartum period tended to have delayed the oestrus expression in the cows. Moreover, the low level of BCS in the peripartum period, regardless of the number of days of the first ovulation and the first oestrus, potentially influenced the prolongation in the number of days open. To improve the fertility of the cows, it is important to elucidate the factors affecting the fluctuations in the BCS during the peripartum period. Table 1.Reproductive performance of dairy cows differing in interval to postpartum first ovulation

P3-07-46: Accuracy of SPIO-Enhanced MR Imaging Alone for the Diagnosis of Sentinel Node Metastases in Patients with Breast Cancer

Background

Superparamagnetic iron oxide (SPIO)-enhanced MR imaging has been reported to be promising for the detection of metastases in sentinel nodes localized by CT lymphography in patients with breast cancer (Motomura, Ann Surg Oncol 2011). The current SPIO technique involves imaging before and after contrast administration. This study evaluated the accuracy of SPIO-enhanced MR imaging alone without unenhanced imaging.

Methods: This study included 120 patients with breast cancer demonstrating clinically negative nodes. Sentinel nodes were identified by CT lymphography, and MR imaging of the axilla before and 18–24 hr after interstitial administration of SPIO was performed. A node was considered non-metastatic if it showed a homogenous low signal intensity and metastatic if there was an absence of low signal intensity either in the entire node or in a focal area on SPIO-enhanced MR imaging. The diagnostic accuracy of the SPIO-enhanced imaging alone was compared with that of combined unenhanced and SPIO-enhanced imaging.

Results: The mean number of sentinel nodes identified by CT lymphography was 1.2 (range 1–3). Pathologic evaluation demonstrated that 28 (23.3%) of 120 patients showed metastasis to at least one node. One false negative result was added when the evaluation was based solely on SPIO-enhanced MR imaging. Consequently, the sensitivity decreased from 84.0% to 80.0% and the accuracy decreased from 89.2% to 88.3%, respectively, in the SPIO-enhanced MR imaging alone. However, the differences in sensitivity and accuracy between SPIO-enhanced MR imaging alone and the combined unenhanced and SPIO-enhanced imaging were not significant (McNemar's test; p=1.0). The specificity of enhanced imaging alone and that of combined unenhanced and SPIO-enhanced imaging were both 90.5%.

Conclusions: A single MR imaging examination performed after SPIO administration can be used for accurate diagnosis of sentinel node metastases, and thus reduce the time and cost of imaging.

Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P3-07-46.

Integration of Multilayers in Er-Doped Porous Silicon Structures and Advances in 1.5 μm Optoelectronic Devices

Infrared photoluminescence (PL) and electroluminescence (EL) from erbium-doped porous silicon (PSi) structures are studied. The PL and EL from the Er-doped PSi structures and the absence of silicon band edge recombination, point defect, and dislocation luminescence bands suggest that the Er-complex centers are the most efficient recombination sites. PSi multilayers with very high reflectivity (R ≥ 90%) in the 1.5 gim range have been incorporated in the structures resulting in a PL enhancement of over 100%. Stable and intense EL is obtained from the Er-doped structures. The EL spectrum is similar to that of the PL, but shifted towards higher energy. The unexpected shift in emission opens up the possibility for erbium related luminescence to encompass a larger part of the optimal wavelength window for fiber optic communications.

Nonlinear Electrical Functions of Porous Silicon Light-Emitting Diodes

Some nonlinear electrical characteristics in electroluminescent porous silicon (PS) diodes with a relatively thin PS layer (0.5–5 μm thick) are described. The experimental PS diodes were composed of a semitransparent Au film, a PS layer, p- or n-type Si substrate, and an ohmic back contact. The PS layers were prepared by anodizing Si wafers in an ethanoic HF solution. In some cases, the PS layers were treated by rapid thermal oxidization (RTO) process. When the bias voltage is applied, the PS diodes show the electrical behavior like the metal-insulator-semiconductor (MIS) diodes. The negative-resistance characteristics and memory effect are also observed. These results indicate that the quantum-structured nature of the PS layer appears not only in the optical properties but also in the electrical properties.

221 EFFECT OF STAGE OF CORPUS LUTEUM DEVELOPMENT ON THE IN VITRO PRODUCTION OF BOVINE EMBRYOS

The objective of this study was to investigate the effect of stage of corpus luteum (CL) development on the in vitro production of bovine embryos. Ovaries were classified according to the expected day of the oestrous cycle based on the morphology of the ovaries. Ovaries with a corpus hemorrhagicum and the remnant of the follicular lumen filled with blood were considered the early luteal stage (Days 2 to 4; Day 0 = day of ovulation, n = 46). Ovaries with a large mass of orange tissue in the CL were classified as the midluteal stage (Days 7 to 10, n = 42). Cumulus–oocyte complexes (COC) were collected by aspiration of 2- to 6-mm follicles. The COC were classified into the following grades: COC with >3 compact layers of cumulus cells and evenly granulated cytoplasm were classified into Grade 1; COC with >3 layers cumulus cells and evenly granulated cytoplasm were classified into Grade 2; COC with partially remaining cumulus cells and abnormal cytoplasm were classified into Grade 3; COC without cumulus cells or those with expanded cumulus cells were classified into Grades 4 and 5, respectively. Grades 1 and 2 COC were in vitro matured for 20 h in TCM-199 supplemented with 5% calf serum and 0.02 mg mL–1 of FSH at 38.5°C under an atmosphere of 5% CO2 in air. Matured COC were inseminated with 5 × 106 sperm for 18 h. Presumptive zygotes were cultured in CR1aa medium supplemented with 5% calf serum at 38.5°C under an atmosphere of 5% O2, 5% CO2, and 90% N2 for 9 days (fertilization = Day 0). The mean number of COC and the proportion of COC classified as Grades 1 and 2 were analysed by ANOVA. Cleavage rates on Day 3 and blastocyst rates on Days 7 to 9 were analysed by a chi-square test. The mean number of recovered oocytes in the early luteal stage (18.7 ± 9.5) was significantly higher (P < 0.05) than the number in the midluteal stage (12.2 ± 5.7). The proportion of Grades 1 and 2 oocytes in the early luteal stage [66.7% (531/789)] was significantly higher (P < 0.01) than that in the midluteal stage [51.6% (252/484)]. The cleavage and blastocyst rates in the early luteal stage [60.9% (181/297) and 32.7% (97/297), respectively] were significantly higher (P < 0.05) than those in the midluteal stage [50.7% (76/150) and 20.7% (31/150) respectively].The present study suggests that the stage of development of the CL in bovine ovaries influences the number of recovered oocytes per ovary and the development of in vitro production of bovine embryos.

23 EFFECTS OF THE NUMBER OF SERVICES FERTILITY IN DAIRY COWS

In recent years, reproductive performance of dairy cows has been declining worldwide, especially among cows of high genetic merit for milk production. The cause of the low fertility may considerably vary across countries and is probably multifactorial. This problem remains unsolved. Further, the first-service conception rate of dairy cows has remarkably decreased worldwide. The number of services required for conception has increased due to the low fertility in dairy cows. However, there are few reports about the relationship between conception rates and the number of services in the current dairy cows. The objective of this study was to investigate whether the number of services affects the conception rates of dairy cows. Data concerning the conception rates was obtained for 8386 Holstein cows from 40 commercial dairy herds in eastern Hokkaido, Japan, from 2006 to 2009. The diagnosis of pregnancy was confirmed by rectal palpation between 30 and 45 days after insemination. The average interval between calving and the first-service was 87.3 days. The average milk yield was 8500 kg. Number of conducting services was from the first to the seventh service. The conception rate was analysed using chi-square test. The results are presented in Table1. The conception rate from the first to the seventh service was 40.2 to 54.0%. The conception rate at the first service was significantly low (40.2%); however, the conception rates did not significantly differ after the second-service. A similar tendency was observed during each year. Moreover, the total percentage of conceptions from the first to the third service was 83.8%. The average number of services per conception was 2.2. The results of this study indicate that the first service yielded the lowest conception rates. The conception rates after the second service did not significantly differ. Moreover, ∼84% of the dairy cows became pregnant between the first service and the third service. However, this result shows that ∼16% of the dairy cows in the herds were repeat breeding. In order to improve fertility, it is necessary to study the factors that affect the first-service conception rates of dairy cows. Moreover, to improve the conception rate of dairy cows, it is important to elucidate the cause of these problems. Table 1.The number and percentage of dairy cows conceiving at each of the services for consecutive services

350 EFFECT OF PROGESTERONE SUPPLEMENTATION OF MATURATION MEDIUM ON DEVELOPMENT OF IVM-IVF-IVC BOVINE EMBRYOS

Follicular fluid from small and large bovine follicles contains large amounts of progesterone, and during preovulatory period progesterone concen- tration increase markedly by 18 h after LH surge. Furthermore, cumulus cells express membrane progestin receptor beta (Liu et al. 2008 Steroids 73, 1416-1423). For these reasons, we hypothesized that progesterone supports maturation of preovulatory bovine oocytes to MII stage. The object of this study was to investigate the effect of progesterone supplementation of in vitro maturation medium on competence of bovine oocyte to develop into blas- tocysts in vitro. COCs were collected by the aspiration of 2-6 mm follicles from ovaries within 6 h of slaughter. The COCs were divided into 5 groups: (1) a control group, TCM-199 supplemented with 5% calf serum (CS) as IVM medium, and (2 to 5) progesterone (P4) supplementation groups, TCM- 199 supplemented with 5% CS and 1, 3, 5, and 10 μg mL-1 of P4. Groups of 10 COCs were incubated in 50-μL drops of IVM media at 38.5°C under an atmosphere of 5% CO2 in air for 20 h. The matured COCs were inseminated with 3 × 106 sperm mL-1. After 18 h of gamete co-culture, the pre- sumptive zygotes were cultured in CR1aa media 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 (total cleavage rates) and on Days 7 to 9 (blastocyst rate). Data was analyzedby chi-square test. The results are presented in Table 1. There were no significant differences in the cleavage rates between treatments. However, the blastocyst formation rate of 5 μg mL-1 P4 supplementation group was significantly higher than that of 10 μg mL-1 P4 supplementation group (P < 0.05). In addition, the blastocyst formation rates of 10 μg mL-1 P4 supplementation group was lower than the other groups. These results suggest that progesterone supple- mentation of in vitro, maturation medium affects the competence of the oocytes to develop into blastocysts in vitro, and 5 μg mL-1 P4 supplementation may be effective in increasing embryo production. Furthermore, 10 μg mL-1 P4 supplementation has negative effect on the oocyte competence. Table 1.Effect of progesterone supplementation on development of IVF bovine embryos

SPIO Enhanced MR Imaging for the Detection of Metastases in Sentinel Nodes Localized by CT Lymphography in Patients with Breast Cancer

Background: Ultrasonography, magnetic resonance (MR) imaging, and computed tomography (CT) may detect nodal metastases in patients with breast cancer, but there is not sufficient accuracy with the conventional methods. Recently, superparamagnetic nanoparticles-enhanced MR imaging has been reported to be a promising improvement for diagnostic imaging of lymph node metastases from various tumors. Moreover, sentinel nodes have been reported to be well-identified using CT lymphography in patients with breast cancer. This study evaluated MR imaging with superparamagnetic iron oxide (SPIO) enhancement for the detection of metastases in sentinel nodes localized by CT lymphography in patients with breast cancer, with histopathologic findings as the reference standard.Methods: This study included 102 patients with breast cancer with clinically negative nodes. Each contrast agent was injected intradermally into the skin overlying the breast tumor and in the subareolar region. Sentinel nodes were identified by CT lymphography, and SPIO-enhanced MR imaging of the axilla was performed to detect metastases in the sentinel nodes. A node was considered non-metastatic if it showed a homogenous low signal intensity and metastatic if the entire node or a focal area did not show a low signal intensity on MR imaging. Sentinel node biopsy was performed using a combination of dye and radiocolloid. Imaging results were correlated with histopathologic findings.Results: The mean number of sentinel nodes identified by CT lymphography was 1.1 (range 1–3). Twenty-one of 25 patients with positive sentinel nodes definitively diagnosed by pathology demonstrated metastases on SPIO-enhanced MR imaging. Seventy of 77 patients with negative sentinel nodes definitively diagnosed by pathology were non-metastatic on imaging studies. The sensitivity, specificity, and overall accuracy of MR imaging for the diagnosis of sentinel node metastases were 84%, 91%, and 89%, respectively. In four of 10 patients with micrometastases, the metastases were not detected, but all 15 patients with macrometastases were successfully demonstrated. There were no adverse events associated with either CT or MR imaging.Conclusions: SPIO-enhanced MR imaging is a useful method of detecting metastases in sentinel nodes localized by CT lymphography in patients with breast cancer. Patients with clinically negative nodes may be spared sentinel node biopsy when the sentinel node is diagnosed as disease-free using SPIO-enhanced MR imaging.

Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 1010.

Wnt5a regulates distinct signalling pathways by binding to Frizzled2

Wnt5a regulates multiple intracellular signalling cascades, but how Wnt5a determines the specificity of these pathways is not well understood. This study examined whether the internalization of Wnt receptors affects the ability of Wnt5a to regulate its signalling pathways. Wnt5a activated Rac in the beta-catenin-independent pathway, and Frizzled2 (Fz2) and Ror1 or Ror2 were required for this action. Fz2 was internalized through a clathrin-mediated route in response to Wnt5a, and inhibition of clathrin-dependent internalization suppressed the ability of Wnt5a to activate Rac. As another action of Wnt5a, it inhibited Wnt3a-dependent lipoprotein receptor-related protein 6 (LRP6) phosphorylation and beta-catenin accumulation. Wnt3a-dependent phosphorylation of LRP6 was enhanced in Wnt5a knockout embryonic fibroblasts. Fz2 was also required for the Wnt3a-dependent accumulation of beta-catenin, and Wnt5a competed with Wnt3a for binding to Fz2 in vitro and in intact cells, thereby inhibiting the beta-catenin pathway. This inhibitory action of Wnt5a was not affected by the impairment of clathrin-dependent internalization. These results suggest that Wnt5a regulates distinct pathways through receptor internalization-dependent and -independent mechanisms.

Decreased c‐Myc expression and its involvement in X‐ray‐induced apoptotic cell death of human T‐cell leukaemia cell line MOLT‐4

PURPOSE

To investigate the possible involvement of c-Myc and ceramide-c-Jun N-terminal kinase (JNK) pathway in X-ray-induced apoptotic cell death of MOLT-4 cells.

MATERIALS AND METHODS

The expressions of c-Myc protein and c-myc mRNA after X-irradiation were analysed by Western blotting and RT-PCR between radiosensitive MOLT-4 and radioresistant variant Rh-1a cells with less JNK activation than the parental cells. Apoptotic cell death was determined by a dye exclusion test, the appearance of chromatin condensation and DNA fragmentation. The effect of a JNK activator anisomycin or c-Myc inhibitor peptides (Int-H1-S6A, F8A) on the amount of c-Myc protein and on the induction of apoptosis was investigated, respectively.

RESULTS

In X-irradiated MOLT-4 cells, amounts of both c-myc mRNA and c-Myc protein rapidly decreased, which was followed by apoptotic cell death, while little change or limited reduction of c-Myc protein was observed in X-irradiated Rh-1a cells with accompanying higher cell viability. Exposure of MOLT-4 and Rh-1a cells to c-Myc inhibitor peptides similarly induced apoptotic cell death with decreases of c-Myc protein. Anisomycin rapidly induced JNK activation and a subsequent decrease of c-Myc protein, causing cell death in MOLT-4 cells. On the other hand, Rh-1a cells were more resistant to anisomycin than parental MOLT-4 cells, showing less JNK activation and a delayed decrease of c-Myc protein.

CONCLUSION

A decrease of c-Myc protein was considered important in X-ray-induced apoptotic cell death of MOLT-4 cells; activation of the JNK pathway caused reduction in the amounts of c-myc mRNA and c-Myc protein, and finally induced apoptotic cell death.

Assessing the immune state of dogs suffering from pituitary gland dependent hyperadrenocorticism by determining changes in peripheral lymphocyte subsets

In order to evaluate the immune state of dogs suffering from pituitary-dependent hyperadrenocorticism (PDH), peripheral lymphocyte subsets were examined. Twenty seven PDH dogs and eight healthy control dogs were used in the current study. Eight healthy dogs served as the control group. Twenty seven PDH dogs were categorized into 4 groups based on their post serum cortisol concentrations by ACTH stimulation test: 2-5, excellent control (n = 8); 5-20, fair control (n = 7); >20, poor control (n = 4); and untreated (n = 8). Cell counts were executed with white blood cells (WBC), lymphocytes, CD3(+) (T lymphocytes), CD4(+) (Helper T lymphocytes), CD8(+) (Cytotoxic T lymphocytes), CD21(+) (B lymphocytes) cells in addition to calculating CD4(+)/CD8(+) ratio. Results indicated a significant difference in lymphocyte numbers and lymphocyte subset populations (CD3(+), CD4(+), CD8(+), and CD21(+) cells) between PDH and control dogs. Moreover, comparison of the PDH groups (excellent control; fair control; poor control; untreated) demonstrated that all groups had a significant decrease in lymphocytes numbers (CD3(+), CD4(+) and CD21(+) cell counts) as compared to control group. Meanwhile, no significant differences were observed in WBC counts and CD4(+)/CD8(+) ratio between groups. Furthermore, lymphocyte subset distribution in excellent control PDH dogs without concurrent disease (n = 4) better resembled that of control dogs as compared to PDH dogs with concurrent disease (n = 4). PDH dogs may be suffering from an immuno-depressed state as evidenced by significant differences in lymphocyte subset populations. Furthermore, treatment of both PDH and concurrent disease might improve lymphocyte subset distribution.

Efficacy of oral tegafur-uracil (UFT) as adjuvant therapy as compared with classical cyclophosphamide, methotrexate, and 5-fluorouracil (CMF) in early breast cancer: A pooled analysis of two randomized controlled trials (N-SAS-BC01 trial and CUBC trial)

578

Background: It has been reported that adjuvant oral UFT might be more effective in patients with estrogen receptor (ER)-positive breast cancer (Noguchi et al, J Clin Oncol 2005). 2 randomized clinical trials comparing the efficacy of oral UFT (2 years) with that of classical CMF (6 courses) have been conducted in patients with resected early breast cancer. One study was the N-SAS-BC01 trial (Watanabe et al, J Clin Oncol, in press), conducted in patients with node-negative, high-risk breast cancer. The other was the CUBC trial (Inaji et al, ASCO 2004), performed in patients with node-positive breast cancer. We have performed a pooled analysis of these two randomized trials. Methods: A pooled analysis was performed using individual patient data from the two randomized trials. Hazard ratios (HR) were determined with the Cox regression stratified by study and adjusted for the clinical characteristics of age, tumor size, nodal status, histological type, ER and PgR. The hypothesis was that UFT was noninferior to CMF in all patients or ER-positive patients in terms of relapse-free survival (RFS). Non-inferiority of UFT was concluded if the upper limit of two-sided CI for the HR of RFS did not exceed 1.30; the significance level of CI was determined by the Hochberg multiplicity adjustment (alpha=0.05:two sided). Results: A total of 1,057 patients were analyzed (CMF n=528, UFT n=529). Median follow-up time was 6 years. HR was 1.04 (95% CI: 0.78–1.40) for relapse in all patients and 0.79 (97.5% CI: 0.49–1.27) in ER-positive patients. The table shows HR for RFS according to ER status and age. Conclusions: UFT is noninferior to CMF in terms of inhibiting recurrence of ER-positive early breast cancer. In particular, UFT may be more effective in patients with ER-positive tumors who are 50 years or older.

[Table: see text]

[Table: see text]