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Lyu L, Wang R, Wen H, Li Y, Li J, Wang X, Yao Y, Li J, Qi X. Cyclooxygenases of ovoviviparous black rockfish (Sebastes schlegelii): Cloning, tissue distribution and potential role in mating and parturition. Comp Biochem Physiol B Biochem Mol Biol 2021; 257:110677. [PMID: 34653596 DOI: 10.1016/j.cbpb.2021.110677] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 09/19/2021] [Accepted: 10/06/2021] [Indexed: 01/14/2023]
Abstract
Prostaglandins are a series of unsaturated fatty acids that play critical roles in regulating reproductive events. The prostaglandins endoperoxide H synthases-1/2 (PGHS-1/2; also named cyclooxygenases-1/2, COX-1/2) catalyse the commitment step in prostaglandin synthesis. However, the of the cox genes in teleosts, especially ovoviviparous teleosts, is still unclear. The aim of the present study was to determine the potential role of cox genes in mating and parturition behaviour using black rockfish (Sebastes schlegelii) as a model species. Two transcripts, cox1 and cox2, were cloned. The phylogenetic analysis results revealed that both cox genes were closely related to mammalian coxs. qPCR analyses of their tissue distribution showed that cox1 was mainly expressed in the heart in both sexes, while cox2 was mainly expressed in the testis and ovary. Detection of cox expression in samples from reproductive-related stages further showed that both cox genes may play important roles in mating and parturition processes. In situ hybridization further detected positive cox mRNA signals in the testis and ovary, where they are known to be involved in mating and parturition behaviour. These data suggest that cox1 and cox2 are crucial in inducing mating, gonad regeneration and parturition behaviour.
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Affiliation(s)
- Likang Lyu
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Ru Wang
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Haishen Wen
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Yun Li
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Jianshuang Li
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Xiaojie Wang
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Yijia Yao
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Jifang Li
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China
| | - Xin Qi
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China.
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Ramachandran PD, Muniyappa MD, Kanapadinchareveetil S, Nair SN, Ajithkumar KG, Samraj S, Rajappan A, Varghese A, Kalarickal DC, Ravindran R, Ghosh S, Juliet S. Modulation of the PGE 2-Mediated Pathway in the Eclosion Blocking Effect of Flumethrin and Terpenoid Subfraction Isolated from Artemesia nilagirica in Rhipicephalus annulatus. Molecules 2021; 26:molecules26164905. [PMID: 34443500 PMCID: PMC8401071 DOI: 10.3390/molecules26164905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 12/02/2022] Open
Abstract
Prostaglandins are a group of important cell-signaling molecules involved in the regulation of ovarian maturation, oocyte development, egg laying and associated behaviors in invertebrates. However, the presence of prostaglandin E2 (PGE2), the key enzymes for PGE2 biosynthesis and its interference by drugs were not investigated previously in the ovary of ticks. The present study was undertaken to assess the modulation of the PGE2-mediated pathway in the eclosion blocking effect of flumethrin and terpenoid subfraction isolated from Artemisia nilagirica in Rhipicephalus annulatus ticks. The acaricidal activities and chemical profiling of the terpenoid subfraction were performed. The localization of the cyclooxygenase1 (COX1) and prostaglandin E synthase (PGES) enzymes and the quantification of PGE2 in the ovaries of the ticks treated with methanol (control), flumethrin and terpenoid subfraction were also undertaken. In addition, the vitellogenin concentration in hemolymph was also assayed. Both flumethrin and the terpenoid subfraction of A. nilagirica elicited a concentration-dependent inhibition of fecundity and blocking of hatching of the eggs. The COX1 could not be detected in the ovaries of treated and control ticks, while there was no significant difference observed in the concentration of vitellogenin (Vg) in them. The presence of PGES in the oocytes of control ticks was confirmed while the immunoreactivities against PGES were absent in the vitellogenic oocytes of ticks treated with flumethrin and terpenoid subfraction. The levels of PGE2 were below the detection limit in the ovaries of the flumethrin-treated ticks, while it was significantly lower in the ovaries of the terpenoid subfraction-treated ticks. Hence, the prostaglandin E synthase and PGE2 were identified as very important mediators for the signaling pathway for ovarian maturation and oviposition in ticks. In addition, the key enzyme for prostaglandin biosynthesis, PGES and the receptors for PGE2 can be exploited as potential drug targets for tick control. The detection of PGES by immunohistochemistry and quantification of PGE2 by LC-MSMS can be employed as valuable tools for screening newer compounds for their eclosion blocking acaricidal effects.
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Affiliation(s)
- Panicker Devyani Ramachandran
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
| | - Mahesh Doddadasarahalli Muniyappa
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
| | - Sreelekha Kanapadinchareveetil
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
| | - Suresh Narayanan Nair
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
| | - Karapparambu Gopalan Ajithkumar
- Department of Veterinary Parasitology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (K.G.A.); (A.V.); (D.C.K.)
| | - Sujith Samraj
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
| | - Anoopraj Rajappan
- Department of Veterinary Pathology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India;
| | - Anju Varghese
- Department of Veterinary Parasitology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (K.G.A.); (A.V.); (D.C.K.)
| | - Deepa Chundayil Kalarickal
- Department of Veterinary Parasitology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (K.G.A.); (A.V.); (D.C.K.)
| | - Reghu Ravindran
- Department of Veterinary Parasitology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (K.G.A.); (A.V.); (D.C.K.)
- Correspondence: or ; Tel.: +91-9447713422
| | - Srikanta Ghosh
- Division of Parasitology, ICAR-Indian Veterinary Research Institute, Izatnagar 243122, Bareilly, India;
| | - Sanis Juliet
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India; (P.D.R.); (M.D.M.); (S.K.); (S.N.N.); (S.S.); (S.J.)
- Center for Ethnopharmacology, College of Veterinary and Animal Sciences, Pookode, Kerala Veterinary and Animal Sciences University, Lakkidi, P. O., Wayanad 673576, Kerala, India
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Gasthuys E, Houben R, Haesendonck R, De Baere S, Sys SU, Morrens J, Antonissen G. Development of an in Vivo Lipopolysaccharide Inflammation Model to Study the Pharmacodynamics of COX-2 Inhibitors Celecoxib, Mavacoxib, and Meloxicam in Cockatiels ( Nymphicus hollandicus). J Avian Med Surg 2020; 33:349-360. [PMID: 31833303 DOI: 10.1647/2018-391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) are used frequently in avian medicine for their antipyretic, analgesic, and anti-inflammatory properties during surgery and for diseases that cause tissue damage and inflammation. NSAIDs inhibit cyclooxygenase (COX) enzymes, which are responsible for the induction of pyresis, pain, and inflammation. In our study, a lipopolysaccharide-induced (LPS) pyresis model was optimized using cockatiels (Nymphicus hollandicus) as subject birds (four males/three females) and validated in two females and one male, characterized by an intravenous bolus injection of LPS (7.5 mg/kg) administered at T0 and T24 (24 hours following the first LPS injection). To demonstrate the feasibility of the model to assess pharmacodynamic (PD) parameters of different NSAIDs, mavacoxib 4 mg/kg (four males/four females), celecoxib 10 mg/kg (four males/four females) and meloxicam 1 mg/kg (four males/four females) were evaluated in the model at dosages used frequently in practice. The PD parameters (body temperature, mentation, posture, preference of location in the cage, and prostaglandin E2 [PGE2] plasma concentrations) were determined for 10 hours following the second LPS injection. At the doses evaluated, mavacoxib and celecoxib significantly reduced LPS-induced hypothermia, but had no clear effects on other clinical signs of illness. In contrast, no effect on hypothermia or clinical appearance was observed in the LPS-challenged cockatiels treated with meloxicam. All three NSAIDs were able to inhibit the increase in LPS-induced PGE2 plasma concentrations, yet the effect was most pronounced in the birds treated with meloxicam. Consequently, the presented model opens perspectives for future dose-effect PD studies to optimize analgesic protocols in cockatiels.
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Affiliation(s)
- Elke Gasthuys
- Faculty of Veterinary Medicine, Department of Pharmacology, Toxicology and Biochemistry, Ghent University, 9820 Merelbeke, Belgium
| | - Renée Houben
- Faculty of Veterinary Medicine, Department of Pharmacology, Toxicology and Biochemistry, Ghent University, 9820 Merelbeke, Belgium
| | - Roel Haesendonck
- Department of Pathology, Bacteriology and Avian Diseases, Ghent University, 9820 Merelbeke, Belgium
| | - Siegrid De Baere
- Faculty of Veterinary Medicine, Department of Pharmacology, Toxicology and Biochemistry, Ghent University, 9820 Merelbeke, Belgium
| | - Stanislas U Sys
- Department of Large Animal Internal Medicine, Ghent University, 9820 Merelbeke, Belgium
| | - Joachim Morrens
- VIB, 3001 Leuven, Belgium.,IMEC, 3001 Leuven, Belgium.,KU Leuven, Department of Neuroscience, 3001 Leuven, Belgium.,Neuroelectronics Research Flanders, 3001 Leuven, Belgium
| | - Gunther Antonissen
- Faculty of Veterinary Medicine, Department of Pharmacology, Toxicology and Biochemistry, Ghent University, 9820 Merelbeke, Belgium.,Department of Pathology, Bacteriology and Avian Diseases, Ghent University, 9820 Merelbeke, Belgium
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Berisha B, Rodler D, Schams D, Sinowatz F, Pfaffl MW. Prostaglandins in Superovulation Induced Bovine Follicles During the Preovulatory Period and Early Corpus Luteum. Front Endocrinol (Lausanne) 2019; 10:467. [PMID: 31354631 PMCID: PMC6635559 DOI: 10.3389/fendo.2019.00467] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/27/2019] [Indexed: 12/12/2022] Open
Abstract
The aim of this study was to characterize the regulation pattern of prostaglandin family members namely prostaglandin F2alpha (PTGF), prostaglandin E2 (PTGE), their receptors (PTGFR, PTGER2, PTGER4), cyclooxygenase 2 (COX-2), PTGF synthase (PTGFS), and PTGE synthase (PTGES) in the bovine follicles during preovulatory period and early corpus luteum (CL). Ovaries containing preovulatory follicles or CL were collected by transvaginal ovariectomy (n = 5 cows/group), and the follicles were classified: (I) before GnRH treatment; (II) 4 h after GnRH; (III) 10 h after GnRH; (IV) 20 h after GnRH; (V) 25 h after GnRH, and (VI) 60 h after GnRH (early CL). In these samples, the concentrations of progesterone (P4), estradiol (E2), PTGF and PTGE were investigated in the follicular fluid (FF) by validated EIA. Relative mRNA abundance of genes encoding for prostaglandin receptors (PTGFR, PTGER2, PTGER4), COX-2, PTGFS and PTGES were quantified by RT-qPCR. The localization of COX-2 and PTGES were investigated by established immunohistochemistry in fixed follicular and CL tissue samples. The high E2 concentration in the FF of the follicle group before GnRH treatment (495.8 ng/ml) and during luteinizing hormone (LH) surge (4 h after GnRH, 574.36 ng/ml), is followed by a significant (P<0.05) downregulation afterwards with the lowest level during ovulation (25 h after GnRH, 53.11 ng/ml). In contrast the concentration of P4 was very low before LH surge (50.64 mg/ml) followed by a significant upregulation (P < 0.05) during ovulation (537.18 ng/ml). The mRNA expression of COX-2 increased significantely (P < 0.05) 4 h after GnRH and again 20 h after GnRH, followed by a significant decrease (P < 0.05) after ovulation (early CL). The mRNA of PTGFS in follicles before GnRH was high followed by a continuous and significant downregulation (P < 0.05) afterwards. In contrast, PTGES mRNA abundance increased significantely (P < 0.05) in follicles 20 h after GnRH treatment and remained high afterwards. The mRNA abundance of PTGFR, PTGER2, and PTGER4 in follicles before GnRH was high, followed by a continuous and significant down regulation afterwards and significant increase (P < 0.05) only after ovulation (early CL). The low concentration of PTGF (0.04 ng/ml) and PTGE (0.15 ng/ml) in FF before GnRH, increased continuously in follicle groups before ovulation and displayed a further significant and dramatic increase (P < 0.05) around ovulation (101.01 ng/ml, respectively, 484.21 ng/ml). Immunohistochemically, the granulosa cells showed an intensive signal for COX-2 and PTGES in follicles during preovulation and in granulosa-luteal cells of the early CL. In conclusion, our results indicate that the examined bovine prostaglandin family members are involved in the local mechanisms regulating final follicle maturation and ovulation during the folliculo-luteal transition and CL formation.
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Affiliation(s)
- Bajram Berisha
- Department of Animal Biotechnology, Faculty of Agriculture and Veterinary, University of Prishtina, Pristina, Kosovo
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich, Munich, Germany
- *Correspondence: Bajram Berisha
| | - Daniela Rodler
- Department of Veterinary Sciences, Ludwig Maximilian University of Munich, Munich, Germany
| | - Dieter Schams
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich, Munich, Germany
| | - Fred Sinowatz
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich, Munich, Germany
| | - Michael W. Pfaffl
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich, Munich, Germany
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Berisha B, Schams D, Rodler D, Sinowatz F, Pfaffl MW. Changes in the expression of prostaglandin family members in bovine corpus luteum during the estrous cycle and pregnancy. Mol Reprod Dev 2018; 85:622-634. [DOI: 10.1002/mrd.22999] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 06/04/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Bajram Berisha
- Department of Animal Biotechnology; Faculty of Agriculture and Veterinary, University of Prishtina; Pristina Kosovo
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich; Munich Germany
| | - Dieter Schams
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich; Munich Germany
| | - Daniela Rodler
- Department of Veterinary Sciences; Ludwig Maximilian University of Munich; Munich Germany
| | - Fred Sinowatz
- Department of Veterinary Sciences; Ludwig Maximilian University of Munich; Munich Germany
| | - Michael W. Pfaffl
- Animal Physiology and Immunology Weihenstephan, Technical University of Munich; Munich Germany
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Rodler D, Sinowatz F. Functional Morphology of Thecal Glands in the Ovary of Japanese Quails (Coturnix japonica). Cells Tissues Organs 2018; 205:32-41. [PMID: 29495007 DOI: 10.1159/000486544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 12/28/2017] [Indexed: 11/19/2022] Open
Abstract
The role of thecal glands in the ovary of birds remains controversial. Using transmission electron microscopy and immunohistochemistry, immunohistochemical localisation of cyclooxygenase I and II (COX-1 and COX-2), oestrogen receptor α and β (ER-α and ER-β), androgen receptor (AR) and progesterone receptor (PR), a detailed analysis of the thecal glands was performed. Our ultrastructural studies revealed that the thecal glands of the quail ovary consist of 2 cell types, steroid-producing cells (SPCs) and enclosing cells (ENCs). The SPCs are large, light cells containing a varying number of lipid droplets. Their cytoplasm is characterised by a large amount of smooth endoplasmic reticulum. The ENCs are always located at the periphery of the gland. Some ENCs contain an abundant number of microfilaments, but lipid droplets and dense bodies were rare. Within 1 gland, SPCs with distinct COX-2 immunostaining were interspersed between usually larger numbers of moderately COX-2-positive cells. A completely different staining pattern was observed for COX-1, where the cytoplasm of the ENCs was distinctly immunopositive. The SPCs stained only weakly with antibodies to COX-1. The thecal glands showed distinct reactions for ER-β but only a weak to negative one for ER-α, PR, and AR. Our immunohistochemical and ultrastructural data support our hypothesis that the thecal glands of the quail are involved in steroid hormone and prostaglandin synthesis. The prostaglandins secreted by the thecal glands probably contribute to the ovulation of the follicle first in the hierarchy.
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Douglas JM, Sanchez-Migallon Guzman D, Paul-Murphy JR. Pain in Birds: The Anatomical and Physiological Basis. Vet Clin North Am Exot Anim Pract 2018; 21:17-31. [PMID: 29146030 DOI: 10.1016/j.cvex.2017.08.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This article reviews the current understanding of the anatomy and physiology of pain in birds, with consideration of some of its differences from mammalian pain. From transduction to transmission, modulation, projection, and perception, birds possess the neurologic components necessary to respond to painful stimuli and they likely perceive pain in a manner similar to mammals. This article also describes the current understating of opioid receptors, inflammatory mediators, and additional factors in the modulation of pain in avian species.
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Affiliation(s)
- Jamie M Douglas
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, 1 Garrod Drive, Davis, CA 95616, USA
| | - David Sanchez-Migallon Guzman
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, 1 Garrod Drive, Davis, CA 95616, USA
| | - Joanne R Paul-Murphy
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, 1 Garrod Drive, Davis, CA 95616, USA.
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Rodler D, Sinowatz F. Localization of thrombospondin-1 and its receptor CD36 in the ovary of the ostrich (Struthio camelus). Anat Histol Embryol 2017; 47:124-132. [PMID: 29205453 DOI: 10.1111/ahe.12329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/02/2017] [Indexed: 10/18/2022]
Abstract
Angiogenesis, the formation of new blood vessels from pre-existing vasculature, plays a decisive role for the rapid growth of avian follicles. Compared to mammals, few data on the angiogenesis in the avian ovary are available. However, whereas several pro-angiogenic factors in the avian ovary have been recently studied in detail, little information is available on the localization of anti-angiogenic factors. The aim of this study was to determine the localization and possible function of the anti-angiogenic factor thrombospondin-1 (TSP-1) and its receptor CD36 in the ovary of the ostrich using immunohistochemistry and to correlate the results with ultrastructural data. Whereas the oocytes and granulosa cells of all follicular stages were negative for TSP-1, myofibroblasts of the theca externa and smooth muscle cells of blood vessels showed distinct reactions. A distinctly different staining pattern was observed for CD36. The oocytes were CD36 negative. No immunostaining for CD36 could be observed neither in the granulosa cells nor in the adjacent theca interna of vitellogenic follicles. In the theca externa, blood vessels protruding towards the oocyte showed CD36-positive endothelial cells. In conclusion, a fine balance between angiogenic and anti-angiogenic processes assures that a dense net of blood vessels develops during the rapid growth of a selected follicle. Anti-angiogenic molecules, such as TSP-1 and its receptor CD36 may, after the oocyte has reached its final size, inhibit further angiogenesis and limit the transport of yolk material to the mature oocyte. By this mechanism, the growth of the megalecithal oocyte during folliculogenesis may cease.
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Affiliation(s)
- D Rodler
- Department of Veterinary Sciences, Ludwig-Maximilian University of Munich, Munich, Germany
| | - F Sinowatz
- Department of Veterinary Sciences, Ludwig-Maximilian University of Munich, Munich, Germany
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Elhamouly M, Isobe N, Yoshimura Y. Expression and localization of cyclooxygenases in the oviduct of laying hens during the ovulatory cycle. Theriogenology 2017; 101:1-7. [DOI: 10.1016/j.theriogenology.2017.06.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 06/06/2017] [Accepted: 06/10/2017] [Indexed: 11/28/2022]
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Rodler D. Localization of Vascular Endothelial Growth Factor and Fibroblast Growth Factor 2 in the Ovary of the Ostrich (Struthio camelus). Anat Histol Embryol 2015; 45:428-436. [PMID: 26497821 DOI: 10.1111/ahe.12211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 09/15/2015] [Indexed: 11/28/2022]
Abstract
Vascular endothelial growth factor (VEGF) and fibroblast growth factor 2 (FGF-2) play a paramount role in the regulation of normal and pathologic angiogenesis in the ovary of mammals. Very little is known on the expression of these two growth factors in the avian ovary. The aim of this study was to determine for the first time the localization of VEGF and FGF-2 in the ovary of the ostrich using immunohistochemical techniques to investigate the vascularization of the rapidly growing huge ostrich oocyte. At the oocyte periphery, distinct VEGF-positive granules are visible. In our opinion, the expression of VEGF in the growing oocytes, which does not occur in mammals such as bovines, does not significantly contribute to angiogenesis in the theca interna and externa, where all the original and developing vessels are located, but may contribute to the mitoses and survival of granulosa cells during folliculogenesis. A different immunostaining can be demonstrated for FGF-2: from late pre-vitellogenic follicles, FGF-2 immunopositivity can be observed at the inner perivitelline layer area. In the stroma, the smooth muscle cells of small arteries and the endothelial cells of venules and veins are positively stained for FGF-2. Another interesting finding of this study is the occurrence of a significant number of VEGF- and FGF-2 positive heterophilic granulocytes within the ovarian stroma, which migrate from the periphery of the ovary towards the growing follicles. We assume that the growth factors of the heterophilic granulocytes contribute significantly to the angiogenesis seen in both theca layers.
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Affiliation(s)
- D Rodler
- Institute of Anatomy, Histology and Embryology, Department of Veterinary Sciences, Ludwig-Maximilians-University Munich, Veterinaerstrasse 13, 80539 Munich, Germany.
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