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Tao Y, Zhang P, Girdler F, Frascogna V, Castedo M, Bourhis J, Kroemer G, Deutsch E. Enhancement of radiation response in p53-deficient cancer cells by the Aurora-B kinase inhibitor AZD1152. Oncogene 2007; 27:3244-55. [DOI: 10.1038/sj.onc.1210990] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Tao Y, Zhang P, Frascogna V, Lecluse Y, Auperin A, Bourhis J, Deutsch E. Enhancement of radiation response by inhibition of Aurora-A kinase using siRNA or a selective Aurora kinase inhibitor PHA680632 in p53-deficient cancer cells. Br J Cancer 2007; 97:1664-72. [PMID: 18026198 PMCID: PMC2360282 DOI: 10.1038/sj.bjc.6604083] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Overexpression of Aurora-A kinase has been correlated with cancer susceptibility and poor prognosis in several human cancers. In this study, we evaluated the effect of inhibition of Aurora-A kinase on cell cycle progression and tumour cell survival after exposure to ionising radiation (IR). Combined IR and Aurora-A inhibition by short interfering RNA (siRNA) or by PHA680632 (a selective Aurora kinase inhibitor with submicromolar activity against Aurora-A) prior to IR led to an enhancement of radiation-induced annexin V positive cells, micronuclei formation, and Brca1 foci formation only in cells with deficient p53. However, the drug brought about additive to sub-additive interaction with radiation with regard to in vitro clonogenic survival. Cell cycle analysis revealed a high >4N DNA content 24 h after PHA680632 exposure. DNA content >4N was reduced dramatically when cells were irradiated combined with PHA680632 simultaneously. In vivo xenografts (p53−/− HCT116) of a mice study showed enhanced tumour growth delay (TGD) after the PHA680632−IR combinatorial treatment compared with IR alone. These results demonstrate that PHA680632 in association with radiation leads to an additive effect in cancer cells, especially in the p53-deficient cells, but does not act as a radiosensitiser in vitro or in vivo.
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Mangoni M, Violot D, Morin C, Tao Y, Castaing M, Auperin A, Opolon P, Barritault D, Deutsch E, Bourhis J. Activité protectrice d'un mimétique del'héparanedanslamucite radio-induite chezlasouris. Cancer Radiother 2007. [DOI: 10.1016/j.canrad.2007.09.085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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204
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Coste A, Khalil T, Lemaire JJ, Tao Y, Donnarieix D, Chazal J, Verrelle P. Radiochirurgie par Linac des métastases cérébrales d'origine rénale: résultats sur 19 patients consécutifs. Neurochirurgie 2007. [DOI: 10.1016/j.neuchi.2007.09.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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205
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Abstract
Online case discussion may be used for the education of orthopaedic surgeons. The authors developed a website for discussing orthopaedic cases nine years ago and describe its management. It currently has 20,000 registered users.
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Tao Y, Kim J, Yin Y, Zafar I, Falk S, He Z, Faubel S, Schrier RW, Edelstein CL. VEGF receptor inhibition slows the progression of polycystic kidney disease. Kidney Int 2007; 72:1358-66. [PMID: 17882148 DOI: 10.1038/sj.ki.5002550] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Although the receptors for vascular endothelial growth factor (VEGF) exert their effects on vasculogenesis and angiogenesis through receptors located on endothelial cells, recent studies have shown that these receptors are also present on renal tubular epithelial cells. We investigated the role of VEGF on increased tubule cell proliferation in the Han:SPRD heterozygous (Cy/+) rat model of polycystic kidney disease. The levels of VEGF in the kidneys and the serum, and the expression of the two receptors on tubules were increased in Cy/+ rats. These rats were given ribozymes that specifically inhibited VEGFR1 and VEGFR2 mRNA expression. Tubule cell proliferation within the cysts was significantly decreased in the ribozyme-treated animals leading to decreased cystogenesis, blunted renal enlargement, and prevented the loss of renal function. Our studies show that inhibition of VEGF function may be an important therapeutic option to delay the progression of polycystic kidney disease.
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Tao J, Qin ZQ, Tao Y, Wen L, Shu XS, Wang ZC, Liu XW, Li WJ, Hu WX. Genetic relationships among Chinese pigs and other pig populations from Hunan Province, China. Anim Genet 2007; 38:417-20. [PMID: 17614985 DOI: 10.1111/j.1365-2052.2007.01618.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, protein-level polymorphisms of transferrin, pre-albumin, hemopexin, ceruloplasmin and amylase were investigated in Hunan native pigs and Large Yorkshire pigs collected from Hunan (a province of China), allowing calculations of allele frequencies, average heterozygosities, inbreeding coefficients and genetic distances. The genetic relationship between Southeast Asian native pigs and American pigs was more distant than those among Southeast Asian native pig breeds. The genetic relationship between Southeast Asian native pig breeds and Hampshire pigs was the most distant.
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208
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Ellis MJ, Tao Y, Bhatnagar AS, Ross HC, Evans D, Miller WR, Eiermann W. Cell-cycle complete response after neoadjuvant letrozole predicts superior relapse-free and overall survival: Long-term follow- up of the letrozole P024 study. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
570 Background: The P024 study was a double blind randomized endocrine therapy trial that compared 16 weeks of letrozole 2.5 mg daily (LET) with tamoxifen 20 mg daily (TAM). LET proved to be more effective than TAM in terms of tumor response and rates of breast conservation therapy (1). Biomarker studies also indicated that LET was a more effective anti-proliferative agent, with greater declines in Ki67 values (2). However, in the P024 trial patients experienced a very low rate of pathological complete response (pCR). We have therefore proposed that a cell-cycle complete response (CCCR - in which tumor cell Ki67 staining is 1% or less in the surgical specimen) may be an alternative to pCR because CCCR indicates that the endocrine therapy was maximally effective in causing cell-cycle arrest. In initial studies we had already shown that CCCR is more common with LET than TAM (3), and also there was a strong association between the absence of a CCCR and the presence of HER2 gene amplification (4). In this study we examined the relationships between CCCR and relapse-free and overall survival. Methods: Per protocol, patients were followed yearly for breast cancer relapse, all cause mortality and breast cancer specific mortality. Relapse-free and breast cancer specific survival was examined according to CCCR status after patients had been followed for five years on adjuvant TAM. Results: Patients who received neoadjuvant LET and whose tumors exhibited a CCCR had superior relapse-free (log rank P=0.0077) and breast cancer specific survival (P=0.0006). Patients who received TAM with a CCCR had superior RFS (P=0.0224) but not breast cancer specific survival. Conclusions: This study supports the conclusion that CCCR may be a clinically useful measurement for patients who undergo neoadjuvant LET. The value of CCCR after neoadjuvant TAM is less clear. A prospective trial that incorporates information on CCCR into clinical decision making regarding adjuvant chemotherapy may be appropriate. 1. Ann Oncol 12, 1527–32 (2001) 2. Cancer Res 63, 6523–31 (2003). 3. J Steroid Biochem Mol Biol 95, 91–5 (2005). 4. J Clin Oncol 24, 3019–25 (2006). No significant financial relationships to disclose.
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Tao Y, Tillack MS, Harilal SS, Sequoia KL, Burdt RA, Najmabadi F. Mass-limited Sn target irradiated by dual laser pulses for an extreme ultraviolet lithography source. OPTICS LETTERS 2007; 32:1338-40. [PMID: 17440580 DOI: 10.1364/ol.32.001338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A thin Sn film was investigated as a mass-limited target for an extreme ultraviolet (EUV) lithography source. It was found that those energetic ions that are intrinsic with the mass-limited Sn target could be efficiently mitigated by introducing a low-energy prepulse. High in-band conversion efficiency from a laser to 13.5 nm EUV light could be obtained using an Sn film with a thickness down to 30 nm when irradiated by dual laser pulses. It was shown that the combination of dual pulse and inert Ar gas could fully mitigate ions with a low ambient pressure nearly without the penalty of the absorption of the EUV light.
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Tao Y, Han W, Zhang M, Ding J, Zhang X. 91 PRODUCTION OF A CLONED BOER GOAT (CAPRA HIRCUS) BY SOMATIC CELL NUCLEAR TRANSFER. Reprod Fertil Dev 2007. [DOI: 10.1071/rdv19n1ab91] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We reported the birth of a goat clone produced by somatic cell nuclear transfer. The fusion and activation protocols of reconstructed oocytes and embryo transfer procedure were optimized. The donors of somatic cells were fibroblasts derived from ear skin of a Boer goat while the recipient ooplasm was in vitro-matured oocytes of Huanghuai white goat, an Anhui native goat species. The reconstructed embryos were activated by ionomycin, 6-dimethylaminopurine (6-DMAP), and cytochalasin B (CB) singly or simultaneously (termed as Ionomycin, Ionomycin+6-DMAP, and Ionomycin+6-DMAP+CB). The result showed that the cleavage rate in single ionomycin was significantly lower than that in Ionomycin+6-DMAP and 6-DMAP+CB (34.38% vs. 69.85% and 72.02%; P < 0.05). However, the cleavage rates and blastocyst rates had no significant difference after in vitro culture (P > 0.05). When the cloned embryos were co-cultured with fetal mouse fibroblast monolayer, the blastocyst development rate increased. The reconstructed embryos were equilibrated 1–3 h, 3–6 h, and 6–9 h after fusion, and then activation was undertaken by ionomycin+6-DMAP. We found that the cleavage rates had no significant difference during 1–3 h and 3–6 h (72.58% vs. 72.97%; P > 0.05), but both were significantly higher than during 6–9 h (64.40%) (P < 0.05). A total of 491 reconstructed embryos were surgically transferred into 37 recipient surrogates, Huanghuai white goats with natural estrus. One of those who were treated with hCG after transfer was pregnant and gave birth to a live kid on 153 days. The lamb died accidentally 8 h after birth. The cloned offspring was then dissected and proved well in all organs. Staining of paraffin tissue slices of the viscera suggested that the organs developed well. Microsatellite analysis indicated that the lamb was derived from the somatic cell donor doe genetically.
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Tao Y, Shokes JE, Scott RA, Nesson MH, Schofield RMS. XAFS Studies of Transition Metal and Halogen Biomaterials in Invertebrate Tools. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2644523] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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212
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Hosokawa Y, Matsuge S, Hayashi K, Tao Y, Nakno R, Kemmochi Y, Ishimine A, Murakami Y, Kano S. [Current problems in the diagnosis of malignant pleural mesothelioma]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2007; 60:14-8. [PMID: 17249532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The diagnosis of malignant pleural mesothelioma (MPM) is challenging although MPM is highly aggressive tumor. The current diagnostic gold standard is principally based on light microscopic examination of hematoxylin-eosin and immunohistochemical stains of large tissue sections. However, pathological diagnosis of MPM and classification of histological findings into 1 of the 3 subtypes (epithelial, sarcomatoid, biphasic) are difficult. We studied correlation between initial and final histological diagnosis retrospectively from the records of 21 cases with MPM from 1989 to 2005. The diagnosis of MPM was confirmed by histopathological examination of pleural tissue samples obtained by closed biopsy under computed tomography (CT) or ultrasonography-guided (5 cases), by biopsy under thoracoscopy with local anesthesia (9), by open biopsy via thoracotomy (2), and by video-assisted thoracoscopic surgery (VATS) [5] . Pleural biopsy under those diagnostic methods led to initial diagnosis of MPM in 15 of 21 cases (71.4%) . In 6 cases (28.6%) , initial diagnosis of MPM were not confirmed because of missing malignant tissue (1 case) and relatively small and sarcomatous element (5). In 2 cases examined by closed biopsy and in 3 examined by thoracoscopy under local anesthesia, initial diagnosis of MPM were not confirmed. To get the accurate diagnosis of MPM, obtaining large tissue samples in the initial examination by less invasive thoracoscopy is recommended.
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Zhang P, Castedo M, Tao Y, Violot D, Métivier D, Deutsch E, Kroemer G, Bourhis J. 2603. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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214
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Liu B, Lee KW, Anzo M, Zhang B, Zi X, Tao Y, Shiry L, Pollak M, Lin S, Cohen P. Insulin-like growth factor-binding protein-3 inhibition of prostate cancer growth involves suppression of angiogenesis. Oncogene 2006; 26:1811-9. [PMID: 16983336 DOI: 10.1038/sj.onc.1209977] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Insulin-like growth factor-binding protein-3 (IGFBP-3) is a multifunctional protein that induces apoptosis utilizing both insulin-like growth factor receptor (IGF)-dependent and -independent mechanisms. We investigated the effects of IGFBP-3 on tumor growth and angiogenesis utilizing a human CaP xenograft model in severe-combined immunodeficiency mice. A 16-day course of IGFBP-3 injections reduced tumor size and increased apoptosis and also led to a reduction in the number of vessels stained with CD31. In vitro, IGFBP-3 inhibited both vascular endothelial growth factor- and IGF-stimulated human umbilical vein endothelial cells vascular network formation in a matrigel assay. This action is primarily IGF independent as shown by studies utilizing the non-IGFBP-binding IGF-1 analog Long-R3. Additionally, we used a fibroblast growth factor-enriched matrigel-plug assay and chick allantoic membrane assays to show that IGFBP-3 has potent antiangiogenic actions in vivo. Finally, overexpression of IGFBP-3 or the non-IGF-binding GGG-IGFBP-3 mutant in Zebrafish embryos confirmed that both IGFBP-3 and the non-IGF-binding mutant inhibited vessel formation in vivo, indicating that the antiangiogenic effect of IGFBP-3 is an IGF-independent phenomenon. Together, these studies provide the first evidence that IGFBP-3 has direct, IGF-independent inhibitory effects on angiogenesis providing an additional mechanism by which it exerts its tumor suppressive effects and further supporting its development for clinical use in the therapy of patients with prostate cancer.
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215
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Tao Y, Harilal SS, Tillack MS, Sequoia KL, O'Shay B, Najmabadi F. Effect of focal spot size on in-band 13.5 nm extreme ultraviolet emission from laser-produced Sn plasma. OPTICS LETTERS 2006; 31:2492-4. [PMID: 16880866 DOI: 10.1364/ol.31.002492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The effect of focal spot size on in-band 13.5 nm extreme ultraviolet (EUV) emission from laser-produced Sn plasmas was investigated for an EUV lithography light source. Almost constant in-band conversion efficiency from laser to 13.5 nm EUV light was noted with focal spot sizes from 60 to 500 microm. This effect may be explained by the opacity of Sn plasmas. Optical interferometry showed that the EUV emission must pass through a longer plasma with higher density when the focal spot is large, and strong reabsorption of EUV light was confirmed by a dip located at 13.5 nm in the spectrum.
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Abstract
OBJECTIVES To evaluate resting energy expenditure (REE) in surgical infants and define the effects of the degree of stress on its level. SUBJECTS AND METHODS Between June 1999 and June 2003 forty-five infants awaiting surgery (boys/girls: 32/13) from the Department of Pediatric Surgery were entered in the study. Indirect calorimetry was used to measure the REE of all the patients before operation and 1 - 7 days after operation. Clinical data were collected, including age, weight, height, diagnosis, operative method, site and duration, and first day postoperative C-reactive protein (CRP) levels. RESULTS The REE before operation did not differ significantly from the postoperative values (paired t-test, p > 0.05). The predicted REE was significantly higher than the measured REE even before and after the operation (p < 0.01). REE values in the first three postoperative days were lower in the mild stress group than in the severe surgical stress group. CONCLUSIONS REE variation among the patients is relatively large. Changes in REE may be related to the degree of stress. Predicted REE values may be not a good reflection of measured REE.
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Zhang P, Castedo M, Tao Y, Violot D, Métivier D, Deutsch E, Kroemer G, Bourhis J. Caspase independence of radio-induced cell death. Oncogene 2006; 25:7758-70. [PMID: 16862186 DOI: 10.1038/sj.onc.1209744] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Colon carcinoma cells subjected to gamma-irradiation (4 Gy) manifest signs of apoptosis (caspase activation, chromatin condensation, phosphatidylserine (PS) exposure on the cell surface, sub-diploid DNA content), correlating with their radiosensitivity, which is increased in cells lacking the 14-3-3sigma protein as compared to wild-type controls. Inhibition of caspases by addition of Z-Val-Ala-DL-Asp (OMe)-fluoromethylketone, by stable transfection with the Baculovirus gene coding for p35, or by Bax knockout reduced all signs of apoptosis, yet failed to suppress radio-induced micro- and multinucleation. Moreover, pharmacological caspase inhibition, p35 expression or Bax knockout had no effect on the clonogenic survival that was reduced by gamma-irradiation and caspase inhibition failed to abolish the increased radiosensitivity of 14-3-3sigma-deficient cells. Micro- and multinucleation was detectable among non-apoptotic cells lacking PS exposure, as well as among cells undergoing apoptosis. Moreover, a fraction of micro- or multinucleated cells manifested caspase activation, and videomicroscopic analyses revealed that such cells could succumb to caspase-dependent apoptosis. Altogether, these results suggest that genomic instability induced by gamma-irradiation can trigger apoptosis, although apoptosis is dispensable for radio-induced clonogenic death.
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218
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Harilal SS, Tillack MS, Tao Y, O'Shay B, Paguio R, Nikroo A. Extreme-ultraviolet spectral purity and magnetic ion debris mitigation by use of low-density tin targets. OPTICS LETTERS 2006; 31:1549-51. [PMID: 16642168 DOI: 10.1364/ol.31.001549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We investigate the extreme-ultraviolet (EUV) emission from targets that contain tin as an impurity and the advantages of using these targets for ion debris mitigation by use of a magnetic field. The EUV spectral features were characterized by a transmission grating spectrograph. The in-band EUV emission energy was measured with a calorimeter of absolute calibration. The ion flux coming from the plume was measured with a Faraday cup. Our studies indicate that 0.5% Sn density is necessary to obtain a conversion efficiency very close to that of full-density Sn. The use of Sn-doped low-Z targets provides a narrower unresolved transition array and facilitates better control of energetic ions in the presence of a moderate magnetic field of 0.64 T.
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Miller W, Tao Y, Ellis M, Bhatnagar A, Evans D, Sasano H. Tumour aromatase as measured by immunohistochemistry in patients treated neoadjuvantly with either letrozole or tamoxifen in the P024 randomised trial—correlations with other biomarkers. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)80346-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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220
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Xie D, Zeng YX, Wang HJ, Wen JM, Tao Y, Sham JST, Guan XY. Expression of cytoplasmic and nuclear Survivin in primary and secondary human glioblastoma. Br J Cancer 2006; 94:108-14. [PMID: 16404364 PMCID: PMC2361075 DOI: 10.1038/sj.bjc.6602904] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Clinically, human glioblastoma (GBM) may develop de novo or from a low-grade glioma (secondary GBM), and molecular alterations in the two pathways may differ. This study examined the status of Survivin expression and apoptosis in 30 primary and 26 secondary GBMs. Our results show that cytoplasmic Survivin positivity was significantly (P<0.001) more frequent in primary GBMs (83%) than that in secondary GBMs (46%). In addition, an inverse correlation of cytoplasmc Survivin positivity with GBM apoptotic index, and a positive association between cytoplasmic Survivin and size of the tumours were observed. These results suggest that cytoplasmic Survivin, via its antiapoptotic function, may be involved in the tumorigenesis of many primary GBMs, but only in a small fraction of secondary GBMs. Furthermore, the overall progression times from low-grade precursor lesions to secondary GBMs were significantly shorter (P<0.05) in cytoplasmic Survivin-positive cases (mean, 15.6 months) than those in Survivin-negative cases (mean, 23.8 moths), and the positive expression level of Survivin in cytoplasm was upregulated in most secondary GBMs when compared to matched pre-existing low-graded lesions. These results suggest that the increased accumulation of Survivin in the cytoplasm of more malignant glioma cells may prove to be a selective advantage, thus accelerating progression to a more aggressive phenotype.
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Tao J, Hu WX, Msangi CI, Luo ZY, Tang LJ, Qin ZQ, Liu SP, Tao Y. Investigation of serum protein systems in Chinese pigs. Anim Genet 2005; 36:223-6. [PMID: 15932401 DOI: 10.1111/j.1365-2052.2005.01292.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polymorphisms of transferrin (Tf), pre-albumin (Pa), haemopexin (Hpx), ceruloplasmin (Cp) and amylase (Am) of Duroc pigs and Hunan indigenous pigs were investigated using horizontal starch gel electrophoresis. Allele frequencies of Durocs determined in 2004 were compared with frequencies presented in the paper by Baker L.N. (1968) Serum protein variation in Duroc and Hampshire pigs. Vox Sanguinis15, 154-8. The number of serum protein alleles decreased over time and allele frequencies aggregated across certain alleles, including TfB, PaA, Hpx3, CpB and AmB. Differences in allele frequencies, average heterozygosities and standard genetic distances between the Duroc pigs and Hunan indigenous pig populations were examined. The relationship between Durocs and Hunan indigenous pigs was found to be more distant than those among the three Hunan indigenous pig populations.
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Ellis MJ, Tao Y, Young O, White S, Proia A, Jackson J, Renshaw L, Krause A, Evans DB, Miller WR, Dixon MJ. Estrogen-independent cell proliferation occurs in the majority of estrogen receptor positive (ER+)/HER2 gene-amplified primary breast cancers: Evidence from a combined analysis of two independent neoadjuvant letrozole studies. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.9538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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224
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Marcom PK, Isaacs C, Harris L, Bryant M, Kommareddy A, Tao Y, Mann G, Ellis MJ. A phase II trial of letrozole and trastuzumab for ER and/or PgR and HER2 positive metastatic breast cancer: Final results. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.596] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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225
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Zhang M, Tao Y, Zhou B, Xie H, Wang F, Lei L, Huo L, Sun Q, Xia G. Atrial natriuretic peptide inhibits the actions of FSH and forskolin in meiotic maturation of pig oocytes via different signalling pathways. J Mol Endocrinol 2005; 34:459-72. [PMID: 15821110 DOI: 10.1677/jme.1.01673] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Atrial natriuretic peptide (ANP) as well as its receptors is found in mammalian ovary and follicular cells and its function in oocyte meiotic maturation has also been reported in Xenopus, hamster and rat. But the results are controversial and the physiological mechanism of ANP on oocyte maturation is not clear, especially the relationship between gonadotrophin and ANP as well as the signal transduction, and these need further study. The present study conducted experiments to examine these questions by using drug treatment and Western blot analysis and focused on pig oocyte meiotic maturation and cumulus expansion in vitro. The results revealed that ANP could inhibited FSH-induced pig oocyte maturation and cumulus expansion and prevent the full phosphorylation of mitogen-activated protein kinase in both oocytes and cumulus cells, and that these inhibitory effects could be mimicked by 8-Br-cyclic guanosine 5'-monophosphate (8-Br-cGMP), but blocked by a protein kinase G (PKG) inhibitor KT5823. Zaprinast, a cGMP-specific phosphodiesterase inhibitor, could enhance the inhibitory effect of ANP on oocyte maturation. A specific analogue of ANP, C-ANP-(4-23), which binds to the natriuretic peptide receptor-C (NPRC), had no effect in either FSH-induced or spontaneous oocyte maturation. Treatment with forskolin, a stimulator of adenylate cyclase, had a biphasic effect; 44 h treatment induced cumulus expansion but inhibited oocyte maturation while 2 h treatment induced maturation of cumulus-enclosed oocytes (CEOs). Both ANP and C-ANP-(4-23) could inhibit the effect of forskolin on CEO maturation, and these inhibitory effects of ANP/C-ANP-(4-23) could be blocked by preincubation with pertussis toxin (PT), consistent with mediation by a Gi protein(s) in the cumulus cells. All these results suggest that ANP is a multifunctional regulator of FSH and forskolin on pig CEO maturation by two signalling mechanisms: one is via a cGMP/PKG pathway, the other is via NPRC receptors in cumulus cells and the activation of the PT-sensitive Gi protein(s).
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