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Delesalle C, Vert G, Fujita S. The cell surface is the place to be for brassinosteroid perception and responses. Nat Plants 2024; 10:206-218. [PMID: 38388723 DOI: 10.1038/s41477-024-01621-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 01/05/2024] [Indexed: 02/24/2024]
Abstract
Adjusting the microenvironment around the cell surface is critical to responding to external cues or endogenous signals and to maintaining cell activities. In plant cells, the plasma membrane is covered by the cell wall and scaffolded with cytoskeletal networks, which altogether compose the cell surface. It has long been known that these structures mutually interact, but the mechanisms that integrate the whole system are still obscure. Here we spotlight the brassinosteroid (BR) plant hormone receptor BRASSINOSTEROID INSENSITIVE1 (BRI1) since it represents an outstanding model for understanding cell surface signalling and regulation. We summarize how BRI1 activity and dynamics are controlled by plasma membrane components and their associated factors to fine-tune signalling. The downstream signals, in turn, manipulate cell surface structures by transcriptional and post-translational mechanisms. Moreover, the changes in these architectures impact BR signalling, resulting in a feedback loop formation. This Review discusses how BRI1 and BR signalling function as central hubs to integrate cell surface regulation.
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Affiliation(s)
- Charlotte Delesalle
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/Université Toulouse 3, Auzeville-Tolosane, France
| | - Grégory Vert
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/Université Toulouse 3, Auzeville-Tolosane, France
| | - Satoshi Fujita
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/Université Toulouse 3, Auzeville-Tolosane, France.
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2
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Dolde U, Muzzopappa F, Delesalle C, Neveu J, Erdel F, Vert G. LEAFY homeostasis is regulated via ubiquitin-dependent degradation and sequestration in cytoplasmic condensates. iScience 2023; 26:106880. [PMID: 37260753 PMCID: PMC10227421 DOI: 10.1016/j.isci.2023.106880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 04/06/2023] [Accepted: 05/11/2023] [Indexed: 06/02/2023] Open
Abstract
The transcription factor LEAFY (LFY) plays crucial roles in flower development by activating floral homeotic genes. Activation of LFY targets requires the combined action of LFY and the E3 ubiquitin ligase UFO, although the precise underlying mechanism remains unclear. Here, we show that LFY accumulates in biomolecular condensates within the cytoplasm, while recombinant LFY forms condensates with similar properties in vitro. UFO interacts with LFY within these condensates and marks it for degradation. LFY levels in the nucleus are buffered against changes in total LFY levels induced by proteasome inhibition, UFO overexpression, or mutation of lysine residues in a disordered region of LFY. Perturbation of cytoplasmic LFY condensates by 1,6-hexanediol treatment induces the relocalization of LFY to the nucleus and the subsequent activation of the LFY target AP3 in flowers. Our data suggest that nucleocytoplasmic partitioning, condensation, and ubiquitin-dependent degradation regulate LFY levels in the nucleus to control its activity.
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Affiliation(s)
- Ulla Dolde
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/University of Toulouse/Toulouse-INP, 24 chemin de Borde Rouge, 31320 Auzeville Tolosane, France
| | - Fernando Muzzopappa
- Center for Integrative Biology (CBI), Molecular, Cellular and Developmental Biology UMR5077 CNRS/University of Toulouse, 169 Avenue Marianne Grunberg-Manago, 31062 Toulouse Cedex, France
| | - Charlotte Delesalle
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/University of Toulouse/Toulouse-INP, 24 chemin de Borde Rouge, 31320 Auzeville Tolosane, France
| | - Julie Neveu
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/University of Toulouse/Toulouse-INP, 24 chemin de Borde Rouge, 31320 Auzeville Tolosane, France
| | - Fabian Erdel
- Center for Integrative Biology (CBI), Molecular, Cellular and Developmental Biology UMR5077 CNRS/University of Toulouse, 169 Avenue Marianne Grunberg-Manago, 31062 Toulouse Cedex, France
| | - Grégory Vert
- Plant Science Research Laboratory (LRSV), UMR5546 CNRS/University of Toulouse/Toulouse-INP, 24 chemin de Borde Rouge, 31320 Auzeville Tolosane, France
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Pluim M, Martens A, Vanderperren K, Sarrazin S, Koene M, Luciani A, van Weeren PR, Delesalle C. Short- and long term follow-up of 150 sports horses diagnosed with tendinopathy or desmopathy by ultrasonographic examination and treated with high-power laser therapy. Res Vet Sci 2018; 119:232-238. [PMID: 30005398 DOI: 10.1016/j.rvsc.2018.06.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/24/2018] [Accepted: 06/10/2018] [Indexed: 12/17/2022]
Affiliation(s)
- M Pluim
- Department of Virology, Parasitology & Immunology, Research Group Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; Tierklinik Luesche, Essernerstrase 39a, 49456 Bakum, Germany.
| | - A Martens
- Department of Surgery and Anaesthesiology of domestic animals, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - K Vanderperren
- Department of Veterinary Medical Imaging and Small Animal Orthopedics, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - S Sarrazin
- Department of obstetrics, Reproduction and herd health, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - M Koene
- Tierklinik Luesche, Essernerstrase 39a, 49456 Bakum, Germany
| | - A Luciani
- Tierklinik Luesche, Essernerstrase 39a, 49456 Bakum, Germany
| | - P R van Weeren
- Department of Equine Sciences, Utrecht University, Yalelaan 1, 3584, CL, Utrecht, the Netherlands
| | - C Delesalle
- Department of Virology, Parasitology & Immunology, Research Group Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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Robyn J, Plancke L, Boshuizen B, De Meeûs C, De Bruijn M, Delesalle C. Substrate use in horses during exercise - the ‘fasted’ compared to the postprandial state. VLAAMS DIERGEN TIJDS 2017. [DOI: 10.21825/vdt.v86i5.16166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Training in the fasted state has beneficial effects on performance in the human athlete. In the horse, training in the fasted state is associated with an increased mobilization of non-esterified fatty acids (NEFA) as an energy source. This is in contrast with postprandial (grain-fed) training, during which lipolysis is suppressed. A higher NEFA availability is thought to reduce muscle glycogen depletion and muscle acidification. This could aid in delaying muscle fatigue. The equine gastrointestinal tract and roughage rich diet do not allow a real ‘fasted’ state. Luckily, roughage does not induce high plasma insulin peaks, and therefore does not have the same negative effects as grain feeding. Furthermore, the roughage-containing hindgut serves as a fluid and electrolyte buffer and continuously provides the liver with propionic acid, a precursor used in gluconeogenesis. In horses, unlike in human athletes, there is still a lot to discover when it comes to optimal pre-exercise feeding management throughout competition and training. However, whatever approach is chosen, high quality roughage needs to be the key ingredient of the equine diet. In sport horses with high energy demands, feeding good quality roughage may be combined with fibre rich concentrates, pelleted roughages sources or vegetal oil instead of starch rich concentrates to reach the energy requirements for intensive work. Last but not least, feeding multiple small meals throughout the day is preferred over feeding a larger meal twice a day.
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Vermeulen R, De Meeûs C, Plancke L, Boshuizen B, De Bruijn M, Delesalle C. Effects of training on equine muscle physiology and muscle adaptations in response to different training approaches. VLAAMS DIERGEN TIJDS 2017. [DOI: 10.21825/vdt.v86i4.16183] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It is well known that exercise induces chemical, metabolic and structural changes in muscles. However, the effect of the type of exercise on these changes has not been thoroughly studied in horses yet, because of a lack of standardized study methods. In this review, the effect of three different types of exercise on muscle adaptation and metabolic responses is investigated. The requirements for power exercise are not the same as for low intensity exercise. Each type of training induces its own shift in muscle fiber typing, as well as in enzyme concentrations and (an) aerobic capacity. These physiological adaptations in response to training facilitate more efficient exercise and therefore increase performance. Hence, it is important to know the adaptations that muscles undergo in response to each type of exercise to optimize training management of sport horses in function of the needs of the discipline in which they compete.
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De Mare L, Boshuizen B, Plancke L, De Meeûs C, De Bruijn M, Delesalle C. Standardized exercise tests in horses: current situation and future perspectives. VLAAMS DIERGEN TIJDS 2017. [DOI: 10.21825/vdt.v86i2.16290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purpose of this literature review is to clarify how exercise capacity can be measured in horses and which standardized exercise tests (SETs) exist. In this review, the measurement of the exercise capacity of horses is discussed and the standardized exercise tests (SET) are described. Two main types of SETs are used. Laboratory or treadmill tests are easy to standardize and provide more options to use all kinds of measuring devices, since the horse stays on the treadmill. On the other hand, field tests are conducted under the natural conditions associated with the specific sports discipline, and are easier to implement in the training schedule. However, field tests encompass interfering variables, such as weather conditions, ground surface conditions and the rider or jockey. Several variables are measured in order to calculate the fitness level which may be expressed by different parameters, such as V200 (speed at a heart rate of 200 beats per minute), Vla4 (speed at a blood lactic acid level of 4 mmol/L) and VO2max (maximum oxygen uptake).
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Ploeg M, Gröne A, van de Lest CHA, Saey V, Duchateau L, Wolsein P, Chiers K, Ducatelle R, van Weeren PR, de Bruijn M, Delesalle C. Differences in extracellular matrix proteins between Friesian horses with aortic rupture, unaffected Friesians and Warmblood horses. Equine Vet J 2017; 49:609-613. [PMID: 27859600 DOI: 10.1111/evj.12654] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/06/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Unlike in Warmblood horses, aortic rupture is quite common in Friesian horses, in which a hereditary trait is suspected. The aortic connective tissue in affected Friesians shows histological changes such as medial necrosis, elastic fibre fragmentation, mucoid material accumulation and fibrosis with aberrant collagen morphology. However, ultrastructural examination of the collagen fibres of the mid-thoracic aorta has been inconclusive in further elucidating the pathogenesis of the disease. OBJECTIVES To assess several extracellular matrix (ECM) components biochemically in order to explore a possible underlying breed-related systemic ECM defect in Friesians with aortic rupture. STUDY DESIGN Cadaver study. METHODS Tissues from affected Friesians (n = 18), unaffected Friesians (n = 10) and Warmblood horses (n = 30) were compared. Samples were taken from the thoracic aorta at the level of the rupture site, from two locations caudal to the rupture and from the deep digital flexor tendon. Total collagen content, post-translational modifications of collagen formation including lysine hydroxylation, and hydroxylysylpyridinoline (HP), lysylpyridinoline (LP) and pyrrole cross-links were analysed. Additionally, elastin cross-links, glycosaminoglycan content and matrix metalloproteinase (MMP) activity were assessed. RESULTS Significantly increased MMP activity and increased LP and HP cross-linking, lysine hydroxylation and elastin cross-linking were found at the site of rupture in affected Friesians. These changes may reflect processes involved in healing and aneurysm formation. Unaffected Friesians had less lysine hydroxylation and pyrrole cross-linking within the tendons compared with Warmblood horses. No differences in the matrix of the aorta were found between normal Warmbloods and Friesian horses. MAIN LIMITATIONS Small sample size. CONCLUSIONS The differences in collagen parameters in tendon tissue may reflect differences in connective tissue metabolism between Friesians and Warmblood horses.
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Affiliation(s)
- M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - A Gröne
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - C H A van de Lest
- Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands.,Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - V Saey
- Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - L Duchateau
- Department of Comparative Physiology and Biometrics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - P Wolsein
- Institute for Pathology, University of Veterinary Medicine Foundation, Hannover, Germany
| | - K Chiers
- Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - R Ducatelle
- Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - P R van Weeren
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - M de Bruijn
- Equine Clinic, Oldeholtpade, the Netherlands
| | - C Delesalle
- Department of Comparative Physiology and Biometrics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Abstract
The aorta can rupture at the aortic root or aortic arch. In most breeds, the aortic root is the likely site and rupture leads to aortocardiac fistula with communication between the aorta and the right atrium, right ventricle and/or the interventricular septum. There is a high prevalence of aortic rupture in young Friesian horses and rupture occurs at the aortic arch with pseudoaneurysm and potentially aortopulmonary fistulation. Echocardiographic and post-mortem techniques must be adapted to identify aortic arch rupture that is not generally identified with standard approaches. Given the narrow genetic base of the Friesian breed and the significant differences found in extracellular matrix composition and metabolism between Friesians and Warmbloods, genetic factors are likely to contribute to the condition in the Friesian breed.
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Affiliation(s)
- M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - V Saey
- Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - G van Loon
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - C Delesalle
- Department of Comparative Physiology and Biometrics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Saey V, Vandecasteele T, van Loon G, Cornillie P, Ploeg M, Delesalle C, Gröne A, Gielen I, Ducatelle R, Chiers K. Friesian horses as a possible model for human acquired aortopulmonary fistulation. BMC Res Notes 2016; 9:405. [PMID: 27527829 PMCID: PMC4986238 DOI: 10.1186/s13104-016-2201-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 08/03/2016] [Indexed: 01/24/2023] Open
Abstract
Background Acquired aortopulmonary fistulation is a rare condition in humans. It usually results as a late complication of a true or pseudoaneurysm of the thoracic aorta. It is most commonly associated with trauma or surgery, less commonly with atherosclerosis, inflammation, hypertension or Marfan’s syndrome. Aortopulmonary fistulation is also seen as a rare complication of acute aortic dissection. On rare occasions, acquired aortopulmonary fistulation is reported in aged patients without any of the above mentioned triggering factors. Thus, these cases should be considered as idiopathic aortopulmonary fistulation. Clearly, the pathogenesis of this condition is not yet completely understood. Friesian horses are highly inbred and are affected by several genetic conditions. Rupture of the thoracic aorta has a relatively high prevalence in Friesian horses and is often characterized by the formation of a pseudoaneurysm with subsequent fistulation into the pulmonary artery. Affected animals may survive for several weeks to months. Findings Here we performed vascular casting in three affected Friesian horses. In all three cases, an aortic rupture at the caudoventral side of the aorta was connected with a rupture of the main pulmonary artery just proximal to its bifurcation. Conclusions Affected Friesians show a consistent location and configuration of the aortic rupture site, very similar to the human condition and therefore could act as a spontaneous model to study this disease. Electronic supplementary material The online version of this article (doi:10.1186/s13104-016-2201-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- V Saey
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium.
| | - T Vandecasteele
- Department of Morphology, Ghent University, Merelbeke, Belgium
| | - G van Loon
- Department of Large Animal Internal Medicine, Ghent University, Merelbeke, Belgium
| | - P Cornillie
- Department of Morphology, Ghent University, Merelbeke, Belgium
| | - M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - C Delesalle
- Department of Comparative Physiology and Biometrics, Ghent University, Merelbeke, Belgium
| | - A Gröne
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - I Gielen
- Department of Veterinary Medical Imaging and Small Animal Orthopaedics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - R Ducatelle
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
| | - K Chiers
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
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Saey V, Ploeg M, Delesalle C, van Loon G, Gröne A, Ducatelle R, Duchateau L, Chiers K. Morphometric Properties of the Thoracic Aorta of Warmblood and Friesian Horses with and without Aortic Rupture. J Comp Pathol 2016; 154:225-30. [PMID: 26987511 DOI: 10.1016/j.jcpa.2016.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 02/01/2016] [Accepted: 02/03/2016] [Indexed: 12/11/2022]
Abstract
Rupture of the aorta is much more common in Friesians compared with other breeds of horse. Rupture always occurs adjacent to the scar of the ligamentum arteriosum. Previous histological examination of ruptured aortic walls suggested the presence of an underlying connective tissue disorder. Therefore, the aim of the present study was to compare the structural characteristics of the tunica media of the mid-thoracic aorta, distant to the lesion, in warmblood and Friesian horses with and without thoracic aortic rupture. In unaffected Friesian horses, the thickness of the tunica media, as well as the percentage area comprised of collagen type I, were significantly higher compared with the warmblood horses, supporting the hypothesis of a primary collagen disorder in the Friesian horse breed. However, in the tunica media of the affected Friesian horses there was no significant wall thickening. Moreover, the percentage area comprised of elastin was significantly lower, while the percentage area comprised of smooth muscle was higher, compared with unaffected Friesian and warmblood horses. These lesions are suggestive of an additional mild elastin deficiency with compensatory smooth muscle cell hypertrophy in affected Friesians.
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Affiliation(s)
- V Saey
- Laboratory of Veterinary Pathology, Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium.
| | - M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - C Delesalle
- Department of Comparative Physiology and Biometrics, Belgium
| | - G van Loon
- Department of Large Animal Internal Medicine, Ghent University, Merelbeke, Belgium
| | - A Gröne
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - R Ducatelle
- Laboratory of Veterinary Pathology, Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
| | - L Duchateau
- Department of Comparative Physiology and Biometrics, Belgium
| | - K Chiers
- Laboratory of Veterinary Pathology, Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
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Ploeg M, Gröne A, Saey V, de Bruijn C, Back W, van Weeren P, Delesalle C. Morphological characterization of megaoesophagus in friesian horses. J Comp Pathol 2015. [DOI: 10.1016/j.jcpa.2014.10.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ploeg M, Gröne A, Saey V, de Bruijn CM, Back W, van Weeren PR, Scheideman W, Picavet T, Ducro BJ, Wijnberg I, Delesalle C. Esophageal Dysfunction in Friesian Horses: Morphological Features. Vet Pathol 2014; 52:1142-7. [PMID: 25367366 DOI: 10.1177/0300985814556780] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Megaesophagus appears to be more common in Friesian horses than in other breeds. A prevalence of approximately 2% was observed among Friesian horses presented to the Wolvega Equine Clinic and the Utrecht University Equine Clinic. In this study, morphologic changes in the esophagi of Friesian horses with megaesophagus were compared with those of 6 control horses. Of 18 horses with clinically observed megaesophagus, only 12 animals had esophageal dilation at necropsy, usually involving the thoracic portion. Muscular hypertrophy of the distal esophagus was present in only one-third of the affected horses, indicating that this change is not the most relevant cause of megaesophagus in Friesians. Increased deposition of clumped and disorganized collagen was present in these clinically affected horses mainly in the non-dilated portion of the esophagus. At necropsy, a decrease in neural elements and elastin was present principally in horses with megaesophagus. Mild degeneration and necrosis of the tunica muscularis along the entire length of the esophagus were present in clinically affected horses and encountered only rarely in control animals. There were no significant differences among affected and control horses with respect to inflammation, mineralization, or the number of cells of Cajal. The increased occurrence of megaesophagus in the Friesian breed compared with other horse breeds, together with the presence of abnormal collagen in very young foals, supports the hypothesis that megaesophagus is hereditary in Friesians.
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Affiliation(s)
- M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - A Gröne
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - V Saey
- Laboratory of Veterinary Pathology, Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - C M de Bruijn
- Wolvega Equine Hospital, Oldeholtpade, the Netherlands
| | - W Back
- Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - P R van Weeren
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - W Scheideman
- Tierärzliche Klinik Domäne Karthaus, Weddern 16c, Dülmen, Germany
| | - T Picavet
- Bosdreef Equine Clinic, Spelonckvaart, Moerbeke-Waas, Belgium
| | - B J Ducro
- Animal Breeding and Genomics Centre, Wageningen University and Research Centre, Wageningen, the Netherlands
| | - I Wijnberg
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - C Delesalle
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Delesalle C, de Vienne C, Le Hello C, Verspyck E, Dreyfus M. [Antiphospholipid syndrome and pregnancy: Obstetrical prognosis according to the type of APS]. ACTA ACUST UNITED AC 2014; 44:463-70. [PMID: 25042624 DOI: 10.1016/j.jgyn.2014.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/26/2014] [Accepted: 06/12/2014] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The objective of our study was to compare treatment-based obstetrical outcomes in women with either thrombotic or obstetrical antiphospholipid syndrome (APS). MATERIALS AND METHODS This was a historical cohort study conducted between 1998 and 2009 in 23 patients who had a total of 83 pregnancies. The syndrome was diagnosed using the 2006 Sapporo criteria. RESULTS Thirty-one of these 83 pregnancies were valid before the diagnosis was made. A live infant was born in 22% of them, the infant being small for gestational age in 26% of cases. The fetus died in utero in a further 26% of cases. Pregnancies were subdivided into 2 groups depending on whether the initial event leading to APS diagnosis was obstetrical or thrombotic. Treatment (aspirin and low molecular weight heparin) was based on this classification: the latter was given in a curative dose for thrombotic events, in a preventive dose for obstetrical events. No fetal loss was observed when treatment was administered according to the protocol. Nevertheless, 20% of the pregnancies with obstetrical APS were complicated by smallness for gestational age and only 38% of the infants were live births. More than 87% of the thrombotic forms treated were free of complications and led to birth of a living child. CONCLUSION Appropriate treatment appears to improve the prognosis for pregnancies in patients with APS. These patients are nevertheless at increased risk of an obstetrical event and require close monitoring, especially in obstetrical manifestations, which appear to have a poorer prognosis. Multidisciplinary follow-up by an experienced team is essential.
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Affiliation(s)
- C Delesalle
- Service et département de gynécologie-obstétrique et médecine de la reproduction, pôle femme-enfant, CHU de Caen, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse Normandie, Esplanade de la paix, 14032 Caen cedex 5, France.
| | - C de Vienne
- Service et département de gynécologie-obstétrique et médecine de la reproduction, pôle femme-enfant, CHU de Caen, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France
| | - C Le Hello
- Département de médecine vasculaire, CHU de Caen, 14000 Caen, France
| | - E Verspyck
- Pôle gynécologique et obstétrical, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen, France; Université de Rouen, 22, boulevard Gambetta, 76000 Rouen, France
| | - M Dreyfus
- Service et département de gynécologie-obstétrique et médecine de la reproduction, pôle femme-enfant, CHU de Caen, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse Normandie, Esplanade de la paix, 14032 Caen cedex 5, France
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Ploeg M, Saey V, Delesalle C, Gröne A, Ducatelle R, de Bruijn M, Back W, van Weeren PR, van Loon G, Chiers K. Thoracic Aortic Rupture and Aortopulmonary Fistulation in the Friesian Horse. Vet Pathol 2014; 52:152-9. [DOI: 10.1177/0300985814528219] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Aortic rupture in horses is a rare condition. Although it is relatively common in the Friesian breed, only limited histopathologic information is available. Twenty Friesian horses (1–10 years old) were diagnosed with aortic rupture by postmortem examination. Ruptured aortic walls were analyzed with histology and immunohistochemistry. Based on the histologic and immunohistochemical findings, these cases were divided into 3 groups: acute ( n = 4, 20%), subacute ( n = 8, 40%), and chronic ( n = 8, 40%). Features common to samples from horses in all groups included accumulation of mucoid material; disorganization and fragmentation of the elastic laminae; aortic medial smooth muscle hypertrophy; and medial necrosis of varying degrees, ranging from mild and patchy in the acute cases to severe midzonal necrosis in the chronic cases. Inflammation, most likely secondary to medial necrosis, varied from predominantly neutrophilic infiltrates in the media and periadventitial tissue in the acute group to the presence of mainly hemosiderophages in the periadventitial tissue in the chronic group. Medial fibrosis with aberrant collagen morphology was seen in the subacute group and, more commonly, in the chronic group. Only minimal changes were seen in the aortic vasa vasorum. Smooth muscle hypertrophy and accumulation of mucoid material were not related to the age of the lesions. The findings of this study suggest that a connective tissue disorder affecting elastin or collagen in the aortic media is potentially the underlying cause of aortic rupture in Friesian horses.
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Affiliation(s)
- M. Ploeg
- Utrecht University, Utrecht, Netherlands
- Authors with equal contribution
| | - V. Saey
- Ghent University, Merelbeke, Belgium
- Authors with equal contribution
| | | | - A. Gröne
- Ghent University, Merelbeke, Belgium
| | | | - M. de Bruijn
- Wolvega Equine Hospital, Oldeholtpade, Netherlands
| | - W. Back
- Wolvega Equine Hospital, Oldeholtpade, Netherlands
| | | | | | - K. Chiers
- Ghent University, Merelbeke, Belgium
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15
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Delesalle C, Dolley P, Beucher G, Dreyfus M, Benoist G. [Uterine artery pseudoaneurysm: an unusual cause of postpartum hemorrhage]. ACTA ACUST UNITED AC 2014; 44:88-92. [PMID: 24656739 DOI: 10.1016/j.jgyn.2014.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 11/28/2013] [Accepted: 02/06/2014] [Indexed: 11/25/2022]
Abstract
Uterine artery pseudoaneurysm is a rare complication of cesarean section. It can lead to severe postpartum hemorrhage. We report three cases of pseudoaneurysm diagnosed late after cesarean delivery, one followed by hemorrhagic shock. Ultrasound may point to the diagnosis, but arteriography of uterine arteries is decisive for the diagnosis. Selective artery embolization is recommended for treatment. Main advantages are complete occlusion of the pseudoaneurysm and fertility preservation.
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Affiliation(s)
- C Delesalle
- Département d'obstétrique, gynécologie et médecine de la reproduction, CHU de Caen, pôle Femme-Enfant, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse-Normandie, esplanade de La-Paix, 14032 Caen cedex 5, France
| | - P Dolley
- Département d'obstétrique, gynécologie et médecine de la reproduction, CHU de Caen, pôle Femme-Enfant, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse-Normandie, esplanade de La-Paix, 14032 Caen cedex 5, France
| | - G Beucher
- Département d'obstétrique, gynécologie et médecine de la reproduction, CHU de Caen, pôle Femme-Enfant, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France
| | - M Dreyfus
- Département d'obstétrique, gynécologie et médecine de la reproduction, CHU de Caen, pôle Femme-Enfant, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse-Normandie, esplanade de La-Paix, 14032 Caen cedex 5, France
| | - G Benoist
- Département d'obstétrique, gynécologie et médecine de la reproduction, CHU de Caen, pôle Femme-Enfant, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France; Université de Caen Basse-Normandie, esplanade de La-Paix, 14032 Caen cedex 5, France.
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16
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de Bruijn M, van Loon G, Ploeg M, Gröne A, De Clercq D, Decloedt A, van Weeren R, Back W, Delesalle C. Use of Transoesophageal Ultrasound to Visualise the Aortopulmonary Region in two Normal Friesian Horses and Three Friesians with Aortic Rupture or Aortopulmonary Fistulation. Equine Vet J 2013. [DOI: 10.1111/evj.12145_28] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - G. van Loon
- Ghent University; Faculty of Veterinary Medicine, Department of Large Animal Internal Medicine; Belgium
| | - M. Ploeg
- Utrecht University; Faculty of Veterinary Medicine, Department of Equine Sciences; The Netherlands
| | - A. Gröne
- Utrecht University; Faculty of Veterinary Medicine, Department of Equine Sciences; The Netherlands
| | - D. De Clercq
- Ghent University; Faculty of Veterinary Medicine, Department of Large Animal Internal Medicine; Belgium
| | - A. Decloedt
- Ghent University; Faculty of Veterinary Medicine, Department of Large Animal Internal Medicine; Belgium
| | - R. van Weeren
- Utrecht University; Faculty of Veterinary Medicine, Department of Equine Sciences; The Netherlands
| | - W. Back
- Utrecht University; Faculty of Veterinary Medicine, Department of Equine Sciences; The Netherlands
| | - C. Delesalle
- Utrecht University; Faculty of Veterinary Medicine, Department of Equine Sciences; The Netherlands
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Decanter C, Delesalle C, Leroy-Martin B, Keller L, Dewailly D, Mailliez A. Fertility preservation by controlled ovarian hyperstimulation (COH) without letrozole in young breast cancer patients before adjuvant chemotherapy: preliminary results. Fertil Steril 2013. [DOI: 10.1016/j.fertnstert.2013.07.1467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ploeg M, Saey V, de Bruijn CM, Gröne A, Chiers K, van Loon G, Ducatelle R, van Weeren PR, Back W, Delesalle C. Aortic rupture and aorto-pulmonary fistulation in the Friesian horse: characterisation of the clinical and gross post mortem findings in 24 cases. Equine Vet J 2012; 45:101-6. [PMID: 22607232 DOI: 10.1111/j.2042-3306.2012.00580.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
REASONS FOR PERFORMING STUDY In horses, aortic sinus of Valsalva aneurysms or tears in the aortic root are well-recognised conditions in breeding stallions, often leading to sudden death. A more uncommon form of aortic rupture, located proximal to the ligamentum arteriosum has been reported in 3 Friesian horses. OBJECTIVES The purpose of this study was to phenotypically characterise aortic rupture and aorto-pulmonary fistulation in Friesian horses in terms of clinical and post mortem data based on 24 cases. METHODS Friesian horses that were diagnosed with aortic rupture and aorto-pulmonary fistulation over a period of 13 years (1997-2010) at the Department of Equine Sciences of Utrecht University (n = 15) and Wolvega Equine Hospital (n = 9), were included in this study. Case history, results of clinical examination and gross post mortem findings were screened and analysed. RESULTS Some cases were found dead without prior symptoms, but in several cases signs such as recurrent colic, peripheral oedema and sustained tachycardia were present for several weeks prior to cardiac failure. Clinical examination during hospitalisation revealed increased rectal temperature, peripheral oedema and increased jugular pulse with a bounding arterial pulse. In the majority of horses an aortic rupture of the aortic arch near the ligamentum arteriosum, concurrent with a circumferential cuff of perivascular haemorrhage and aorto-pulmonary fistulation, was found at post mortem examination. CONCLUSIONS Aorto-pulmonary fistulation in conjunction with aortic rupture is more common in Friesians than previously estimated. In some cases findings demonstrate a progressive pathology rather than acute cardiac failure and sudden death. An appropriate approach is necessary during post mortem examination of the heart in order not to overlook the diagnosis. POTENTIAL RELEVANCE Equine practitioners should realise that in Friesian horses presented with a history of recurrent false colic, coughing, sustained tachycardia and/or peripheral oedema, aortic rupture and aorto-pulmonary fistulation should be included in the differential diagnosis.
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Affiliation(s)
- M Ploeg
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
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De Ceulaer K, Delesalle C, Van Elzen R, Van Brantegem L, Weyns A, Van Ginneken C. Morphological changes in the small intestinal smooth muscle layers of horses suffering from small intestinal strangulation. Is there a basis for predisposition for reduced contractility? Equine Vet J 2011; 43:439-45. [PMID: 21496070 DOI: 10.1111/j.2042-3306.2010.00246.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
REASONS FOR PERFORMING STUDY Intestinal strangulation often leads to enterectomy after which ileus can develop. This has prompted research to look into possible pathophysiological processes triggering equine ileus. However, morphological changes of the small intestinal smooth muscle in relation to equine colic have not yet been studied. OBJECTIVES The presence of some smooth muscle proteins was morphologically assessed and quantified in control and colic horses. In addition, the up- or down-regulation of heat shock proteins (HSP20 and HSP27) influencing the contractility of smooth muscles was studied. METHODS Cranial resection margins of 18 strangulated small intestinal samples were collected. Small intestinal control samples were collected from 11 horses subjected to euthanasia for other than gastrointestinal-related reasons. Formaldehyde-fixed tissue was paraffin-embedded and processed for conventional staining and immunohistochemistry. Snap-frozen full-thickness biopsies were collected for western blot analyses. RESULTS Evaluating the muscle layer microscopically, colic samples showed significantly more signs of degradation than controls (P = 0.026) of which vacuolar degeneration was most prominent (P = 0.009). In colic samples, myosin protein levels were decreased (P = 0.022) whereas desmin (P = 0.049) and HSP20 protein levels (P = 0.005) were elevated. CONCLUSIONS In colic samples, microscopic lesions at the level of the muscle layer indicate a stress response. In addition, modified amounts of structural proteins such as myosin and desmin together with increased HSP20 levels could perhaps provide a basis for explaining the malfunctioning of the intestinal muscle layer. POTENTIAL RELEVANCE Post operative ileus, following small intestinal strangulation and resection, could be related in part to a dysfunctional muscle layer. In addition to microscopic signs of degeneration, myosin and HSP20 were affected. Pharmacological interventions might alter HSP20 expressions and thus serve a protective effect.
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Affiliation(s)
- K De Ceulaer
- Department of Veterinary Sciences, Laboratory of Veterinary Anatomy, Embryology and Pathology, University of Antwerp, Belgium
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De Ceulaer K, Van Ginneken C, Delesalle C, Van Brantegem L, Deprez P, Weyns A. The use of slaughterhouse-obtained small intestinal tissue as control material in histological studies should be applied with prudence. Histol Histopathol 2011; 26:427-31. [PMID: 21360435 DOI: 10.14670/hh-26.427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study aimed to evaluate the reliability of slaughterhouse-obtained small intestinal tissue as control material in equine colic research where molecular stress responses in small intestinal tissue are investigated. For this purpose, small intestinal samples from colic horses were collected during surgery or immediately after euthanasia at the oral border of strangulation resection sites and routinely processed for histopathology (i.c. rinsed with 4°C Krebs' solution, fixated overnight with 4% neutral buffered formaldehyde (FH) at room temperature). Control samples consisted of pieces of mid-jejunum, collected at the slaughterhouse and routinely processed for histopathology under 4 different conditions. The 4 conditions differed with regard to incubation and fixation temperature and whether or not oxygenated Krebs' solution was used. Histological scoring revealed that slaughterhouse samples had a higher mean lesion score (P<0.001) than colic samples. In addition, more slaughterhouse samples had a higher mean inflammation score than colic samples (P=0.001). The inflammatory cells in the small intestine consisted mostly of eosinophils and as such were very suggestive for parasitic infestation. Hypoxia-inducible factor-1α (HIF1α) nuclear immunoreactivity was more pronounced in slaughterhouse tissue, probably as a result of the delay between slaughter and sampling (P=0.034). The histopathological score (P=0.291), the inflammation score (P=0.248) and the HIF1α nuclear immunoreactivity (P=0.538) did not differ between the different collection protocols. It is concluded that slaughterhouse-obtained small intestinal tissue shows distinct alterations and that its use as control tissue when evaluating molecular stress responses should be applied with prudence.
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Affiliation(s)
- K De Ceulaer
- Laboratory of Veterinary Anatomy, Embryology and Pathology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
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De Ceulaer K, Delesalle C, Van Elzen R, Van Brantegem L, Weyns A, Van Ginneken C. Morphological data indicate a stress response at the oral border of strangulated small intestine in horses. Res Vet Sci 2011; 91:294-300. [PMID: 21216416 DOI: 10.1016/j.rvsc.2010.11.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 10/19/2010] [Accepted: 11/30/2010] [Indexed: 12/20/2022]
Abstract
Strangulation colic often leads to surgery. We aimed to document the molecular response in the non-resected intestine in these horses using quantitative Western blot analysis, and immunohistochemistry. The expression of hypoxia-inducible factor 1-alpha (HIF1α) was investigated together with two molecular pathways initiated after protein destruction: proteasome degradation via ubiquitin chain formation and protein restoration via molecular chaperones such as inducible heat shock protein 70 (HSP70). In addition, the expression of c-fos and c-jun could indicate an early proinflammatory response. Ubiquitin, HSP70, c-jun and c-fos protein levels did not differ between the control and colic samples nor were they related to the clinical outcome in case of strangulation colic. However, the immunohistochemical distribution of several of these proteins (ubiquitin, HSP70 and c-jun) differed significantly between colic and control samples. The elevated presence of ubiquitin in the enterocytes' nucleus, of HSP70 in the smooth muscle cells' nucleus and of c-jun in enteric neurons suggest protective and degenerative pathways are activated in the apparently healthy non-resected tissue in case of strangulation obstruction, perhaps providing a molecular and morphological basis for the development of complications like post-operative ileus.
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Affiliation(s)
- K De Ceulaer
- Laboratory of Veterinary Anatomy, University of Antwerp, Universiteitsplein 1, 2610 Antwerp, Belgium
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22
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Delesalle C, Hoogewijs M, Govaere J, Declercq J, Schauvliege S, Vanschandevijl K, Deprez P. Ultrasound-guided pervaginal drainage of abscesses associated with rectal tears in four mares. Vet Rec 2009; 165:662-3. [PMID: 19946128 DOI: 10.1136/vr.165.22.662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- C Delesalle
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, University of Ghent, Salisburylaan 133, B-9820 Merelbeke, Merelbeke, Belgium.
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Torfs S, Delesalle C, Dewulf J, Devisscher L, Deprez P. Risk Factors for Equine Postoperative Ileus and Effectiveness of Prophylactic Lidocaine. J Vet Intern Med 2009; 23:606-11. [DOI: 10.1111/j.1939-1676.2009.0311.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Delesalle C, van Acker N, Claes P, Deprez P, de Smet I, Dewulf J, Lefebvre RA. Contractile effects of 5-hydroxytryptamine (5-HT) in the equine jejunum circular muscle: functional and immunohistochemical identification of a 5-HT1A-like receptor. Equine Vet J 2008; 40:313-20. [PMID: 18267888 DOI: 10.2746/042516408x278193] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
REASONS FOR PERFORMING STUDY Prokinetic drugs used to treat gastrointestinal ileus in man have equivocal results in horses. In man, prokinetic drugs have 5-hydroxytryptamine4(5-HT4) receptors as their target, but little is known about the 5-HT-receptor subtypes in the equine small intestine. OBJECTIVE Functional and immunohistochemical identification of the serotonin receptor subtype(s) responsible for the 5-HT induced contractile response in the equine circular jejunum. METHODS Isometric organ-bath recordings were carried out to assess spontaneous and drug-evoked contractile activity of equine circular jejunum. Histological investigations by immunofluorescence analyses were performed to check for presence and localisation of this functionally identified 5-HT receptor subtype. RESULTS Tonic contractions were induced by 5-HT in horse jejunal circular muscle. Tetrodotoxin, atropine and NG-nitro L-arginine did not modify this response. A set of 5-HT receptor subtype selective antagonists excluded interaction with 5-HT1B, 1D, 2A, 3, 4 and 7 receptors. The selective 5-HT1A receptor antagonists WAY 100635 and NAN 190 caused a clear rightward shift of the concentration-response curve to 5-HT. The contractile effect of 5-CT, that can interact with 5-HT1A, 1B, 1D, 5 and 7 receptors was also antagonised by WAY 100635, identifying the targeted 5-HT receptor as a 5-HT1A-like receptor. Immunohistology performed with rabbit polyclonal anti-5-HT1A receptor antibodies confirmed the presence of muscular 5-HT1A receptors in the muscularis mucosae, and both longitudinal and circular smooth muscle layers of the equine jejunum. CONCLUSIONS Contractile responses in equine jejunal circular smooth muscle induced by 5-HT involves 5-HT1A-like receptors.
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Affiliation(s)
- C Delesalle
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
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Delesalle C, Dewulf J, Lefebvre R, Schuurkes J, Van Vlierbergen B, Deprez P. Use of plasma ionized calcium levels and Ca2+substitution response patterns as prognostic parameters for ileus and survival in colic horses. Vet Q 2005. [DOI: 10.1080/01652176.2002.9695197] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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26
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Delesalle C, Dewulf J, Lefebvre RA, Schuurkes JAJ, Van Vlierbergen B, Deprez P. Use of plasma ionized calcium levels and Ca2+ substitution response patterns as prognostic parameters for ileus and survival in colic horses. Vet Q 2005; 27:157-72. [PMID: 16402513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023] Open
Abstract
OBJECTIVE Hypocalcaemia is a common finding in horses with enterocolitis and severe gastrointestinal disorders. The aims of this study were to investigate in colic horses 1)the parameters related to hypocalcaemia, 2)the influence of hypocalcaemia on outcome and 3)the possible beneficial effect of Ca2+ substitution. DESIGN Randomized controlled trial. SETTING Intensive care unit. PATIENTS One hundred forty-four horses that were admitted with an acute abdomen during a 1.5 year period were enrolled and daily evaluated for clinical criteria and whole blood ionized Ca2+ levels. Colic horses with hypocalcaemia were randomly assigned to receive Ca2+. INTERVENTIONS Analysis of heparinised whole blood samples. Horses that were assigned to be treated received 400 mEq Ca2+ diluted in 10L of Ringer's lactate solution every 24 h until low reference range limits were obtained or until death. MEASUREMENTS AND MAIN RESULTS 88% of all colic patients showed blood ionized Ca2+ levels below the reference range at the time of admission. Multivariable analysis revealed that the presence of reflux, signs of endotoxaemia, increased Packed Cell Volume (PCV), alkalinization of pH and the interaction PCV/pH all predispose colic horses to low ionized Ca2+ levels at the time of admission. The Odds for developing ileus during hospitalization are +/- 11.94 times larger for horses in the "very low" calcaemia interval, in comparison with normocalcaemic horses. The Odds for fatal outcome are respectively +/- 9.82 and 8.33 times larger for horses in the "very low" and "low" calcaemia interval. Ca2+ substitution increased the probability of survival, provided that Ca2+ levels could be normalized. The lack of an upward calcaemia response, despite repetitive Ca2+ substitutions, can be guarded as a poor ominous sign. CONCLUSIONS Hypocalcaemia in colic horses is of prognostic relevance both with regard to survival as to the probability of development of ileus during hospitalization. This study shows the importance of routine measurement of ionized calcium levels in colic horses. Moreover, correction of hypocalcaemia seems to improve clinical outcome.
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Affiliation(s)
- C Delesalle
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium.
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De Clercq D, van Loon G, Nollet H, Delesalle C, Lefère L, Deprez P. Percutaneous puncture technique for treating persistent retropharyngeal lymph node infections in seven horses. Vet Rec 2003; 152:169-72. [PMID: 12622287 DOI: 10.1136/vr.152.6.169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Between 1999 and 2001, seven horses with fever, dysphagia and a history of chronic upper respiratory tract infection lasting between three weeks and three months were examined. They had been treated unsuccessfully with a variety of antibiotics for three to four weeks. A deep abscess in a retropharyngeal lymph node was diagnosed in each case by clinical examination, endoscopy and echographic examination of the retropharyngeal region. The infected retropharyngeal lymph node of each horse was punctured with a spinal needle under ultrasound guidance. Pus was aspirated from four of the horses, and their abscesses were then rinsed with 0.9 per cent saline solution, and antibiotics (sodium ceftiofur or penicillin) were injected. In the other three horses the pus was too viscous to be aspirated, and the enlarged lymph node was opened along the tract of the needle and rinsed with chlorhexidine. All the horses were treated with penicillin for two weeks and in six of them the clinical signs gradually disappeared. The other horse continued to show fever and the penicillin treatment was continued for another 10 days, after which the signs gradually disappeared over a period of two months.
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Affiliation(s)
- D De Clercq
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium
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