1
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Lu B, Jiang Q, Liu A, Huang H, Ye H. Stimulatory roles of epidermal growth factor receptor (EGFR) in ovarian development of mud crab Scylla paramamosain. Gen Comp Endocrinol 2020; 299:113616. [PMID: 32950581 DOI: 10.1016/j.ygcen.2020.113616] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/19/2020] [Accepted: 09/09/2020] [Indexed: 11/22/2022]
Abstract
The epidermal growth factor receptor (EGFR) is a pleiotropic glycoprotein which plays a role in regulating cell proliferation, migration and differentiation. However, to date little is known about its functions in crustaceans. In this study, we successfully identified SpEGFR from mud crab Scylla paramamosain. RT-PCR result showed that SpEGFR was widely distributed in all tested tissues and highly expressed in ovary. In situ hybridization revealed that SpEGFR mainly localized in oocyte perinuclear region with notably obvious signals. In vitro experiments showed that the expression of SpVgR and SpCyclin B in ovary explants from late vitellogenic stage crabs (summer) were significantly increased when treated with 1 nM human EGF (hEGF) for 1 h, while there was no obvious change towards SpEGFR. Interestingly, as for winter crab at the same vitellogenic stage, the expression of SpVgR and SpCyclin B in ovary explants did not show significant increase until treated with higher concentration of 10 nM hEGF and longer incubation time of 12 h. In addition, the hEGF-induced effect could be suppressed by pre-treated with EGFR inhibitor AG1478 and PD153035, respectively, which further indicated that EGF-EGFR pathway played a vital role in ovarian development in mud crab. In conclusion, SpEGFR might promote ovarian development by stimulating the expression of SpVgR and SpCyclin B under hEGF-induced treatment. The different physiological response to hEGF in the same vitellogenic stage crabs between summer and winter might be attributed to the changes in metabolism and physiological sensitivity.
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Affiliation(s)
- Bei Lu
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - Qingling Jiang
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - An Liu
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - Huiyang Huang
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
| | - Haihui Ye
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
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2
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Kim JW, Park HJ, Yang SG, Kim MJ, Kim IS, Jegal HG, Wee G, Yang HY, Park JJ, Choo YK, Koo DB. Exogenous Ganglioside GT1b Enhances Porcine Oocyte Maturation, Including the Cumulus Cell Expansion and Activation of EGFR and ERK1/2 Signaling. Reprod Sci 2020; 27:278-289. [PMID: 32046393 DOI: 10.1007/s43032-019-00004-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 03/29/2019] [Indexed: 11/26/2022]
Abstract
Ganglioside GT1b is well-known for its role in cytokine production and in activating epidermal growth factor receptor (EGFR)-mediated signaling pathways in cancer cells. However, there are no reports that clearly elucidate the role of GT1b in EGFR-mediated signaling pathways in porcine oocytes during the process of in vitro maturation (IVM). In this study, we investigated the role of GT1b in EGFR-mediated activation of the ERK1/2 pathway in porcine cumulus-oocyte complexes (COCs) at 44 h of IVM. Our data show that expression of the ST3GAL2 protein significantly increased in porcine COCs at 44 h irrespective of treatment with EGF. Meiotic maturation and mRNA levels of factors (HAS2, TNFAIP6, and PTX3) related to cumulus cell expansion significantly increased in COCs treated with 2 μM GT1b during IVM in the absence of EGF. They also increased in COCs treated with EGF/GT1b as compared to that in the other groups. Interestingly, protein levels of EGFR, phospho-EGFR, ERK1/2, and phospho-ERK1/2 dramatically increased in COCs treated with EGF/GT1b. Moreover, the rate of fertilization and the developmental competence of blastocyst were significantly higher in EGF/GT1b-treated COCs. Taken together, these results suggest that exogenous GT1b improves meiotic maturation and cumulus cell expansion in porcine COCs via activation of EGFR-mediated ERK1/2 signaling.
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Affiliation(s)
- Jin-Woo Kim
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - Hyo-Jin Park
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - Seul-Gi Yang
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - Min-Ji Kim
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - In-Su Kim
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - Ho-Geun Jegal
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea
| | - Gabbine Wee
- Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), 80 Cheombok-ro, Dong-gu, Daegu, 41061, Republic of Korea
| | - Hee-Young Yang
- Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), 80 Cheombok-ro, Dong-gu, Daegu, 41061, Republic of Korea
| | - Joung Jun Park
- Animal Reproduction & Biotechnology Center, Myung-Poom Hanwoo Consulting, Hoengseong, 25232, Republic of Korea
| | - Young-Kug Choo
- Department of Biological Science, College of Natural Sciences, Wonkwang University, 460, Iksandae-ro, Iksan, Jeonbuk, 54538, Republic of Korea
| | - Deog-Bon Koo
- Department of Biotechnology, College of Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan, Gyeongbuk, 38453, Republic of Korea.
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3
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Yong H, Oh HI, Lee SH, Cheong HT, Yang BK, Park CK. Treatment of Epidermal Growth Factor (EGF) enhances Nuclear Maturation of Porcine Oocytes and Stimulates Expression of ER/Golgi Transport Proteins. Dev Reprod 2017; 21:131-138. [PMID: 28785734 PMCID: PMC5532305 DOI: 10.12717/dr.2017.21.2.131] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 04/10/2017] [Accepted: 04/14/2017] [Indexed: 11/17/2022]
Abstract
This study was conducted to investigate stimulatory effect of epidermal growth factor (EGF) on nuclear maturation and the expression level of EGF-receptor (EGFR), GM-130 (a marker of Golgi apparatus), transport protein Sec61 subunit beta (Sec61β), and coatomer protein complex subunit gamma 2 (COPG2) in porcine oocytes. The cumulus-oocyte complexes were collected from follicle with 3-6 mm in diameter. They were incubated in medium with/without EGF for 22 h (IVMⅠ) and subsequently incubated hormone-free medium with/without EGF for 22 h (IVMⅡ). Nuclear maturation state was checked by aceto-orcein stain. Protein expression of EGFR, GM-130, Sec61β, and COPG2 were measured by immunofluorescence. In results, nuclear maturation of oocytes in EGF non-treated oocytes were significantly lower than EGF-treated groups at IVMⅠ or IVMⅡ stage (P<0.05), whereas maturational rate in EGF treatment groups at both of IVM stage was higher in among the all treatment groups (P<0.05). EGFR, GM-130, Sec61β and COPG2 were expressed in the cytoplasm of oocytes. Especially, GM-130 and EGFR were strongly expressed, but Sec61β and COPG2 were weakly expressed in cortical area of cytoplasm. The protein level of GM-130, Sec61β, and COPG2 were significantly higher in the EGF-treated groups (P<0.05). However EGFR was no difference between non EGF-treated groups and control. In conclusion, EGF plays an important role in the systems for oocyte maturation with endoplasmic reticulum and Golgi apparatus. In addition, the protein levels of Sec61β and COPG2 could be changed by EGF in the porcine oocytes during maturation.
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Affiliation(s)
- Hwangbo Yong
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Hae-In Oh
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Sang-Hee Lee
- Institute of Animal Resources , Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Hee-Tae Cheong
- College of Veterinary Medicine, Kangwon National University, Chuncheon 24341, Republic of Kore
| | - Boo-Keun Yang
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Choon-Keun Park
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
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4
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Kim JW, Park HJ, Chae SK, Ahn JH, DO GY, Choo YK, Park JJ, Jung BD, Kim SU, Chang KT, Koo DB. Ganglioside GD1a promotes oocyte maturation, furthers preimplantation development, and increases blastocyst quality in pigs. J Reprod Dev 2016; 62:249-55. [PMID: 26860251 PMCID: PMC4919288 DOI: 10.1262/jrd.2015-083] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Gangliosides are key lipid molecules required for the regulation of cellular processes such as
proliferation, differentiation, and cell signaling, including signaling of epidermal growth factor receptor
(EGFR). Epidermal growth factor (EGF) has long been considered a potential regulator of meiotic and
cytoplasmic maturation in mammalian oocytes. However, there is no report on the direct effect of ganglioside
GD1a in porcine oocyte maturation. In this study, we first investigated a functional link between GD1a and
meiotic maturation during in vitro maturation (IVM) of porcine embryos. Moreover, we
confirmed the effect of exogenous GD1a treatment on blastocyst development, quality, and fertilization rate in
early embryonic development. First, we observed that the protein level of ST3GAL2, a GD1a synthesizing enzyme,
significantly increased (P < 0.01) in cumulus-oocyte-complexes (COCs) during IVM progress. The proportion
of arrested germinal vesicles (GV) increased in oocytes treated with EGF+GD1a (41.6 ± 1.5%) at the IVM I
stage. Upon completion of meiotic maturation, the proportion of metaphase II (M II) was significantly higher
(P < 0.05) in the EGF+GD1a (89.9 ± 3.6%) treated group. After IVF, the percentage of penetrated oocytes was
significantly higher (P < 0.05) in the EGF+GD1a (89.1 ± 2.3%) treated group than in the control group.
Furthermore, exogenous GD1a treatment improved the developmental competence and quality of blastocysts during
preimplantation embryo development stage. These results suggest that ganglioside GD1a may play an important
role in IVM mechanisms of porcine maturation capacity. Furthermore, our findings will be helpful for better
promoting the embryo development and blastocyst quality in pigs.
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Affiliation(s)
- Jin-Woo Kim
- Department of Biotechnology, College of Engineering, Daegu University, Gyeongbuk 712-714, Republic of Korea
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5
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Silvestre F, Fissore RA, Tosti E, Boni R. [Ca2+
]i
rise at in vitro maturation in bovine cumulus-oocyte complexes. Mol Reprod Dev 2012; 79:369-79. [DOI: 10.1002/mrd.22038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 03/07/2012] [Indexed: 01/31/2023]
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6
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Honorato-Sampaio K, Pereira VM, Santos RAS, Reis AM. Evidence that angiotensin-(1-7) is an intermediate of gonadotrophin-induced oocyte maturation in the rat preovulatory follicle. Exp Physiol 2012; 97:642-50. [DOI: 10.1113/expphysiol.2011.061960] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Pereira AF, Alcântara Neto AS, Albuquerque ES, Luciano MCS, Teixeira DIA, Freitas VJF, Melo LM. Goat oocyte production by standard or one-shot FSH treatments and quantitative analysis of transcripts for EGF ligands and its receptor after in vitro maturation. Reprod Domest Anim 2011; 47:244-51. [PMID: 21923881 DOI: 10.1111/j.1439-0531.2011.01845.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Hormonal ovarian stimulation may affect the success of embryo production by regulating transcripts in recovered cumulus-oocyte complexes (COCs). Here, in parallel to morphological classification and in vitro maturation (IVM) rate analysis, we investigated the expression of epidermal growth factor (EGF) and its receptor (EGFR) in oocytes and cumulus cells from goat COCs recovered by laparoscopy after standard [multi-dose follicle-stimulating hormone (FSH)] or one-shot (single dose FSH plus eCG) treatments. No differences were observed among the number of recovered and morphologically graded COCs or the IVM rates for both gonadotropic treatments. However, the standard protocol produced COCs with higher EGFR expression in the cumulus cells than the one-shot treatment. Additionally, EGF mRNA levels were less than EGFR mRNA levels, and they did not differ among COCs from both treatments. However, during maturation, the EGF transcripts increased in oocytes derived only from the standard protocol. Interestingly, IVM strikingly increased EGFR expression in oocytes and cumulus cells but not in oocytes that fail in first polar body extrusion, irrespective of hormonal treatment. These results appear to be related to the resumption of meiosis and suggest that EGF may act through the cumulus cells or directly on the oocyte receptor.
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Affiliation(s)
- A F Pereira
- Faculdade de Veterinária, Universidade Estadual do Ceará, Fortaleza-CE, Brazil
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8
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Effect of cysteamine and epidermal growth factor supplementation on the in vitro maturation rate of ovine oocytes. Small Rumin Res 2011. [DOI: 10.1016/j.smallrumres.2010.10.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Song HJ, Kang EJ, Maeng GH, Ock SA, Lee SL, Yoo JG, Jeon BG, Rho GJ. Influence of epidermal growth factor supplementation during in vitro maturation on nuclear status and gene expression of canine oocytes. Res Vet Sci 2010; 91:439-45. [PMID: 20888022 DOI: 10.1016/j.rvsc.2010.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 07/20/2010] [Accepted: 09/04/2010] [Indexed: 10/19/2022]
Abstract
This study evaluated the effect of epidermal growth factor (EGF) supplementation during in vitro maturation on the meiotic status and the expression of EGF receptor (EGFr), luteinizing hormone receptor (LHr) and gap junction protein α 5 (GJA5) in canine cumulus-oocyte-complexes (COCs). COCs of ≥110 μm diameter, exhibiting dark pigmentation and completely surrounded by three or more layers of cumulus cells collected from anestrus stage ovaries in natural cycle were matured in TCM-199 supplemented with 10% fetal bovine serum, 0.57 mM cysteine, 10 μg/ml LH and FSH, and different concentrations of EGF (0, 10 and 30 ng/ml). Oocytes cultured for 72 h were fixed to assess the nuclear maturation. Expression of EGFr, LHr and GAJ5 was assessed by immunocytochemistry and real-time PCR. Proportion of metaphase II status of oocytes cultured in in vitro maturation (IVM) medium supplemented with 10 ng/ml EGF for 72 h was significantly (P<0.05) higher than 0 and 30 ng/ml EGF supplemented IVM medium (9.8% vs. 6.5% and 5.2%). In both cumulus cells and oocytes, EGFr protein was undetectable, LHr protein level of expression was low and a strong expression of GJA5 protein was observed. The relative abundance (RA) of EGFr transcript revealed low levels and the LHr expression decreased steadily with addition of EGF. However it did not vary among different concentrations of EGF supplementation. The RA of GJA5 transcript exhibited lower level at 10 ng/ml EGF supplementation. In conclusion, the supplementation of 10 ng/ml EGF in IVM media exerted a positive influence on the progression of maturation to MII phase and the expression level of GJA5 at 72 h, but did not demonstrate any stimulatory role on the expression of EGFr and LHr during the maturation of the canine IVM oocytes.
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Affiliation(s)
- H J Song
- College of Veterinary Medicine, Gyeongsang National University, Jinju 660-701, Republic of Korea
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10
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Real-time qRT-PCR analysis of EGF receptor in cumulus-oocyte complexes recovered by laparoscopy in hormonally treated goats. ZYGOTE 2010; 19:127-36. [DOI: 10.1017/s0967199410000225] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryOvarian stimulation with exogenous follicle stimulating hormone (FSH) has been used to increase the number of viable oocytes for laparoscopic oocyte recovery (LOR) in goats. The aim of this study was to evaluate the effect of two FSH protocols for ovarian stimulation in goats on the expression pattern of epidermal growth factor (EGF) receptor (EGFR) in cumulus–oocyte complexes (COCs) recovered by LOR. After real-time qRT-PCR analysis, expression profiles of morphologically graded COCs were compared prior to and after in vitro maturation (IVM) on a FSH protocol basis. The use of a protocol with higher number of FSH injections at a shorter interval resulted in GI/GII COCs with a higher level of EGFR expression in cumulus cells, but not in the oocyte, which was correlated with an elevated meiotic competence following IVM. Based on the maturation profile and EGFR expression patterns observed between groups, the morphological selection of COCs prior to IVM was not a good predictor of oocyte meiotic competence. Therefore, EGFR may be a good candidate marker for indirect prediction of goat oocyte quality. The IVM process of goat COCs increased the EGFR expression in oocytes and cumulus cells, which seemed to be strongly associated with the resumption of meiosis. In summary, differential EGFR expression in goat cumulus cells was associated with the in vivo prematuration process, and in turn, the upregulation in the entire COC was associated with IVM. Cause-and-effect relationships between such increased expression levels, particularly in the oocyte, and oocyte competence itself still need to be further investigated.
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11
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Uhm S, Gupta M, Yang J, Chung HJ, Min T, Lee H. Epidermal growth factor can be used in lieu of follicle-stimulating hormone for nuclear maturation of porcine oocytes in vitro. Theriogenology 2010; 73:1024-36. [DOI: 10.1016/j.theriogenology.2009.11.029] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 11/10/2009] [Accepted: 11/16/2009] [Indexed: 10/19/2022]
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12
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Tripathi A, Kumar KVP, Chaube SK. Meiotic cell cycle arrest in mammalian oocytes. J Cell Physiol 2010; 223:592-600. [PMID: 20232297 DOI: 10.1002/jcp.22108] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Meiotic cell cycle in mammalian oocytes is a dynamic process that involves several stop/go channels. The cell cycle arrest in oocyte occurs at various stages such as diplotene, metaphase-I (M-I), metaphase-II (M-II), and so called metaphase-like arrest (M-III). Leutinizing hormone surge induces meiotic resumption from diplotene arrest in follicular microenvironment by overriding several factors responsible for the maintenance of meiotic arrest. The inhibitory factors are synthesized in oocyte or in the associated follicular somatic cells and transferred to the oocyte. The major factors include hypoxanthine, cyclic adenosine 3', 5'-monophosphate, cyclic guanosine 3', 5'-monophosphate, reactive oxygen species, protein kinase A, and protein kinase C. In the presence of active protein kinases, epidermal-like growth factors are produced that activate mitogen-activated protein kinase in cumulus granulosa cells. The maturation promoting factor, cytostatic factors, and spindle assembly checkpoint proteins are also involved in that maintenance of arrest at various stages of meiotic cell cycle in mammalian oocytes. In this review, we briefly summarize the role of these factors in the maintenance of meiotic cell cycle arrest in mammalian oocytes.
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Affiliation(s)
- Anima Tripathi
- Department of Zoology, Banaras Hindu University, Varanasi, India
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13
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Zhang M, Ouyang H, Xia G. The signal pathway of gonadotrophins-induced mammalian oocyte meiotic resumption. Mol Hum Reprod 2009; 15:399-409. [PMID: 19443606 DOI: 10.1093/molehr/gap031] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Fully grown mammalian oocytes are arrested at the first meiotic prophase until a surge of gonadotrophin at the mid-cycle. The actions of gonadotrophins, follicle stimulating hormone (FSH) and luteinizing hormone (LH), on oocyte meiotic resumption are believed to be mediated in large part through increasing the production of cyclic adenosine 3',5'-monophosphate and subsequent activation of mitogen-activated protein kinase (MAPK) in its surrounding cumulus granulosa cells. Recent findings indicate that gonadotrophins-induced epidermal growth factor-like growth factors, meiosis activating sterol and gonadal steroid hormones, possibly via protein kinase A II and protein kinase C pathways, are involved in the activation of MAPK. Another second messenger cyclic guanosine 3',5'-monophosphate induced by nitric oxide or natriuretic peptides system mediates the function of gonadotrophins during oocyte meiotic resumption. FSH and LH induced pathways may either directly overlap or each hormone may utilize redundant pathways in oocyte maturation. A detailed appreciation of different FSH and LH-activated signaling pathways in mammalian oocytes will be needed in understanding their actions in follicular development and oocyte maturation.
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Affiliation(s)
- Meijia Zhang
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, P.R. China
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14
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Li M, Ai JS, Xu BZ, Xiong B, Yin S, Lin SL, Hou Y, Chen DY, Schatten H, Sun QY. Testosterone potentially triggers meiotic resumption by activation of intra-oocyte SRC and MAPK in porcine oocytes. Biol Reprod 2008; 79:897-905. [PMID: 18667751 DOI: 10.1095/biolreprod.108.069245] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The role of androgen and androgen receptors (ARs) in males has been well established. This steroid and its receptor also exist in follicles, but their functions are still unclear. In this study, using a culture system containing a low dose of hypoxanthine, we revealed the positive contribution of testosterone to oocyte meiotic resumption. By performing ultracentrifugation to allow clear visualization of porcine germinal vesicles, our results provide evidence that mitogen-activated protein kinase (MAPK) in the oocyte itself but not in cumulus cells was activated before germinal vesicle breakdown (GVBD) after testosterone treatment. We further explored the signal cascade of testosterone-triggered GVBD and showed significant contributions of AR to testosterone-induced MAPK activation and GVBD. By using a potent and selective inhibitor of SRC and detecting activation of the kinase, we found that testosterone activated SRC in oocytes but not in cumulus cells and that SRC (as an essential upstream molecule of MAPK) mediated this testosterone- and AR-promoted reinitiation of meiosis. The present findings propose an undefined signaling pathway and suggest the potential competence of testosterone for meiotic resumption in mammalian oocytes.
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Affiliation(s)
- Mo Li
- State Key Laboratory of Reproductive Biology, Institute of Zoology, and Graduate School, Chinese Academy of Sciences, Beijing 100101, China
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15
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Ning G, Ouyang H, Wang S, Chen X, Xu B, Yang J, Zhang H, Zhang M, Xia G. 3',5'-cyclic adenosine monophosphate response element binding protein up-regulated cytochrome P450 lanosterol 14alpha-demethylase expression involved in follicle-stimulating hormone-induced mouse oocyte maturation. Mol Endocrinol 2008; 22:1682-94. [PMID: 18467523 DOI: 10.1210/me.2007-0480] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Cytochrome P450 lanosterol 14alpha-demethylase (CYP51) is a key enzyme in sterols and steroids biosynthesis that can induce meiotic resumption in mouse oocytes. The present study investigated the expression mechanism and function of CYP51 during FSH-induced mouse cumulus oocyte complexes (COCs) meiotic resumption. FSH increased cAMP-dependent protein kinase (PKA) RIIbeta level and induced cAMP response element-binding protein (CREB) phosphorylation and CYP51 expression in cumulus cells before oocyte meiotic resumption. Moreover, CYP51 and epidermal growth factor (EGF)-like factor [amphiregulin (AR)] expression were blocked by (2)-naphthol-AS-Ephosphate (KG-501) (a drug interrupting the formation of CREB functional complex). KG-501 and RS21607 (a specific inhibitor of CYP51 activity) inhibited oocyte meiotic resumption, which can be partially rescued by progesterone. These two inhibitors also inhibited FSH-induced MAPK phosphorylation. EGF could rescue the suppression by KG-501 but not RS21607. Furthermore, type II PKA analog pairs, N(6)-monobutyryl-cAMP plus 8-bromo-cAMP, increased PKA RIIbeta level and mimicked the action of FSH, including CREB phosphorylation, AR and CYP51 expression, MAPK activation, and oocyte maturation. All these data suggest that CYP51 plays a critical role in FSH-induced meiotic resumption of mouse oocytes. CYP51 and AR gene expression in cumulus cells are triggered by FSH via a type II PKA/CREB-dependent signal pathway. Our study also implicates that CYP51 activity in cumulus cells participates in EGF receptor signaling-regulated oocyte meiotic resumption.
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Affiliation(s)
- Gang Ning
- State Key Laboratories for AgroBiotechnology and Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, PR China
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16
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Li M, Liang CG, Xiong B, Xu BZ, Lin SL, Hou Y, Chen DY, Schatten H, Sun QY. PI3-kinase and mitogen-activated protein kinase in cumulus cells mediate EGF-induced meiotic resumption of porcine oocyte. Domest Anim Endocrinol 2008; 34:360-71. [PMID: 18023131 DOI: 10.1016/j.domaniend.2007.10.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Revised: 10/03/2007] [Accepted: 10/04/2007] [Indexed: 10/22/2022]
Abstract
Previous studies have shown that epidermal growth factor (EGF) has the ability to promote in vitro cultured porcine oocyte maturation. However, little is known about the detailed downstream events in EGF-induced meiotic resumption. We designed this study to determine the relationship of EGF, EGFR, phosphatidylinositol 3-kinase (PI3-kinase), MAPK, and germinal vesicle breakdown (GVBD) during oocyte maturation. Our results showed that GVBD in cumulus-enclosed oocytes (CEOs) but not in denuded oocytes (DOs) was induced by EGF in a dose-dependent manner, which indicated that cumulus cells but not oocyte itself were the main target for EGF-induced meiotic resumption. Furthermore, we found that MAPK in cumulus cells rather than in oocyte was activated immediately after EGF administration. To explore whether EGF exerts its functions through MAPK pathway, the activities of EGF receptor (EGFR) and MAPK were inhibited by employing AG1478 and U0126, respectively. Inhibition of MAPK blocked EGF-induced GVBD, whereas inhibition of EGFR prevented MAPK activation. Both AG1478 and U0126 could lead to the failure of EGF-induced GVBD singly. Notably, we found that LY294002, a specific inhibitor of PI3-kinase, effectively inhibited EGF-induced MAPK activation as well as subsequent oocyte meiotic resumption and this inhibition could not be reversed by adding additional EGF. Thus, PI3-kinase-induced MAPK activation in cumulus cells mediated EGF-induced meiotic resumption in porcine CEOs. Together, this study provides evidences demonstrating a linear relationship of EGF/EGFR, PI3-kinase, MAPK and GVBD and presents a relatively definitive mechanism of EGF-induced meiotic resumption of porcine oocyte.
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Affiliation(s)
- Mo Li
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Da Tun Road, Chaoyang, Beijing 100101, PR China
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Liang CG, Su YQ, Fan HY, Schatten H, Sun QY. Mechanisms Regulating Oocyte Meiotic Resumption: Roles of Mitogen-Activated Protein Kinase. Mol Endocrinol 2007; 21:2037-55. [PMID: 17536005 DOI: 10.1210/me.2006-0408] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
AbstractOocyte meiotic maturation is one of the important physiological requirements for species survival. However, little is known about the detailed events occurring during this process. A number of studies have demonstrated that MAPK plays a pivotal role in the regulation of meiotic cell cycle progression in oocytes, but controversial findings have been reported in both lower vertebrates and mammals. In this review, we summarized the roles of MAPK cascade and related signal pathways in oocyte meiotic reinitiation in both lower vertebrates and mammals. We also tried to reconcile the paradoxical results and highlight the new findings concerning the function of MAPK in both oocytes and the surrounding follicular somatic cells. The unresolved questions and future research directions regarding the role of MAPK in meiotic resumption are addressed.
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Affiliation(s)
- Cheng-Guang Liang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Datun Road, Chaoyang Beijing 100101, China
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Songsasen N, Wildt DE. Oocyte biology and challenges in developing in vitro maturation systems in the domestic dog. Anim Reprod Sci 2006; 98:2-22. [PMID: 17097840 PMCID: PMC1868673 DOI: 10.1016/j.anireprosci.2006.10.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The oocyte of the domestic dog is unique from that of other mammalian species studied to date. Ovulation occurs either once or twice per year, with the oocyte released at the germinal vesicle stage, and then completing nuclear and cytoplasmic maturation within the oviduct under the influence of rising circulating progesterone. In vivo meiotic maturation of the bitch oocyte is completed within 48-72 h after ovulation, which is longer than 12-36 h required for oocytes from most other mammalian species. Due to these inherently novel traits, in vitro culture systems developed for maturing oocytes of other species have been found inadequate for maturation of dog oocytes. On average, only 15-20% of ovarian oocytes achieve the metaphase II stage after 48-72 h of in vitro culture. Thus far, no offspring have been produced in the dog (or other canids) by transferring embryos derived from in vitro matured oocytes. This review addresses current knowledge about dog reproductive physiology, specifically those factors influencing in vitro developmental competence of the oocyte. This summary lays a foundation for identifying the next steps to understanding the mechanisms regulating meiotic maturation and developmental competence of the dog oocyte.
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Affiliation(s)
- N Songsasen
- Department of Reproductive Sciences, Conservation and Research Center, Smithsonian's National Zoological Park, Front Royal, VA 22630, USA.
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Grimaldi P, Rossi F. Lack of neurogenesis in the adult rat cerebellum after Purkinje cell degeneration and growth factor infusion. Eur J Neurosci 2006; 23:2657-68. [PMID: 16817868 DOI: 10.1111/j.1460-9568.2006.04803.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Although constitutive neurogenesis exclusively occurs in restricted regions of the adult mammalian brain, resident progenitors can be isolated from many different CNS sites, and neuronal neogeneration can be stimulated in vivo by injury or infusion of growth factors. To ask whether latent compensatory mechanisms, which may be exploited to promote repair processes, are present throughout the CNS, we examined the neurogenic potentialities of the adult rat cerebellum in normal conditions, following injury, and after infusion of growth factors. Degeneration of Purkinje cells was induced by intracerebroventricular administration of the toxin saporin, conjugated to anti-p75 antibodies. In addition, epidermal growth factor and basic fibroblast growth factor, or FGF8, were infused for 2 weeks to either intact or injured animals. In all conditions, proliferating cells were identified from bromodeoxyuridine (BrdU) incorporation. In the unmanipulated cerebellum there were rare dividing cells, mainly represented by NG2-positive presumptive oligodendrocyte precursors. Mitotic activity was strongly enhanced in cortical areas with Purkinje cell degeneration, being mostly sustained by microglia, plus minor fractions of NG2-expressing cells, astrocytes and oligodendrocytes. In contrast, growth factor infusion had a weak effect on both intact and injured cerebella. In all experimental conditions, we never found any BrdU-positive cells coexpressing distinctive markers for immature or differentiated cerebellar neurons. Therefore, although some progenitor cells reside in the adult cerebellum, the local environment, either intact or injured, does not provide efficient cues to direct their differentiation towards neuronal phenotypes. In addition, neurogenic potentialities cannot be induced or boosted by the application of growth factors which are effective in other CNS regions.
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Affiliation(s)
- Piercesare Grimaldi
- Rita Levi Montalcini Centre for Brain Repair, Department of Neuroscience, University of Turin, Corso Raffaello 30, I-10125 Turin, Italy.
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Liang CG, Huo LJ, Zhong ZS, Chen DY, Schatten H, Sun QY. Cyclic adenosine 3',5'-monophosphate-dependent activation of mitogen-activated protein kinase in cumulus cells is essential for germinal vesicle breakdown of porcine cumulus-enclosed oocytes. Endocrinology 2005; 146:4437-44. [PMID: 16002524 DOI: 10.1210/en.2005-0309] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
MAPK plays an important role during meiotic maturation in mammalian oocytes, whereas the necessity of MAPK during meiotic resumption in porcine oocytes is still controversial. Here, by applying the method of ultracentrifugation to move the opaque lipid droplets to the edge of the oocyte, therefore allowing clear visualization of porcine germinal vesicles, oocytes just before germinal vesicle breakdown (GVBD) and those that had just undergone GVBD were selected for the assay of MAPK activation. Our results showed that phosphorylation of MAPK in oocytes occurred after GVBD in all three different culture models: spontaneous maturation model, inhibition-induction maturation model, and normal maturation model. Moreover, we found that activation of MAPK in cumulus cells but not in oocytes was essential for GVBD in cumulus-enclosed oocytes. Then the cross-talk between cAMP and MAPK in cumulus cells was investigated by using cell-type-specific phosphodiesterase (PDE) isoenzyme inhibitors. Our results showed that PDE3 subtype existed in oocytes, whereas PDE4 subtype existed in cumulus cells. PDE3 inhibitor prevented meiotic resumption of oocytes, whereas PDE4 inhibitor enhanced the ability of FSH or forskolin to activate MAPK in cumulus cells. We propose that increased cAMP resulting from inhibition of PDE3 in oocytes blocks GVBD, whereas increased cAMP resulting from inhibition of PDE4 activates MAPK pathway in cumulus cells, which is essential for GVBD induction.
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Affiliation(s)
- Cheng-Guang Liang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China
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