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Asif H, Barnett SD, Buxton ILO. Title: β3 Adrenergic Receptor Signaling in the Human Myometrium. Reprod Sci 2022; 30:124-134. [PMID: 35380411 PMCID: PMC8980516 DOI: 10.1007/s43032-022-00917-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 03/11/2022] [Indexed: 01/06/2023]
Abstract
Preterm labor leading to preterm birth is the leading cause of infant morbidity and mortality. Although β2 adrenergic agonists fail to provide adequate tocolysis, the expression of the β3 adrenergic receptor in myometrium and its unique signaling suggest a role for β3 agonist in the management of preterm labor. Western blot analysis showed that the β3 adrenergic receptor expression increased in human pregnancy myometrium compared to nonpregnant tissues (p < 0.0001). There was no difference in β3 adrenergic receptor expression throughout pregnancy (p > 0.05). The addition of the β3 agonist mirabegron in the tissue bath relaxed oxytocin contracted myometrium with an EC50 of 41.5 µM. Relaxation was partially blocked by the addition of the eNOS blocker Nω-nitro-L-arginine, or the large conductance potassium channel blocker paxilline. Combination of Nω-nitro-L-arginine and paxilline prevented mirabegron-mediated relaxation. Imaging revealed that the β3 adrenergic receptors are expressed by both myocyte and microvascular endothelial cells isolated from human myometrium. Nitric oxide production measured by 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate revealed that mirabegron stimulated nitric oxide production in myometrial endothelial cells. These data suggest that both endothelial and smooth muscle cells contribute to relaxation through disparate signaling pathways. Repurposing of approved medications tested in human myometrium as uterine tocolytics can advance prevention of preterm birth. These data argue that further examination of β3 adrenergic receptor signaling in myometrium may reveal mirabegron as a useful tocolytic in combination tocolysis regimens.
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Affiliation(s)
- Hazik Asif
- School of Medicine, Department of Pharmacology, Myometrial Function Laboratory, University of Nevada, Reno, NV 89557-0318 USA
| | - Scott D. Barnett
- School of Medicine, Department of Pharmacology, Myometrial Function Laboratory, University of Nevada, Reno, NV 89557-0318 USA
| | - Iain L. O. Buxton
- School of Medicine, Department of Pharmacology, Myometrial Function Laboratory, University of Nevada, Reno, NV 89557-0318 USA
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An interim internal Threshold of Toxicologic Concern (iTTC) for chemicals in consumer products, with support from an automated assessment of ToxCast™ dose response data. Regul Toxicol Pharmacol 2020; 114:104656. [DOI: 10.1016/j.yrtph.2020.104656] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 03/04/2020] [Accepted: 04/06/2020] [Indexed: 11/23/2022]
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Zhang JK, Miao J, Chen ZQ, Duan SZ, Zhang X, Ji WJ, Niu JM, Yuan F, Zhou X, Li YM, Zhang Z. β3-Adrenergic Activation Improves Maternal and Offspring Perinatal Outcomes in Diet-Induced Prepregnancy Obesity in Mice. Obesity (Silver Spring) 2019; 27:1482-1493. [PMID: 31328894 DOI: 10.1002/oby.22561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 05/20/2019] [Indexed: 01/03/2023]
Abstract
OBJECTIVE Prepregnancy obesity is an epidemic disorder that seriously threatens both maternal and offspring health. This study investigated the effects of β3-adrenergic receptor (β3-AR) activation on the perinatal outcomes in a diet-induced prepregnancy obese (PPO) murine model. METHODS Four-week-old female C57BL/6 mice were fed high-fat diet or chow diet for 16 weeks to yield PPO mice and chow-fed (CF) lean mice, respectively. After successful mating with CF males, the PPO and CF mice were both randomly divided into vehicle control- or CL316,243 (a highly selective β3-AR agonist)-treated groups. On gestational day 7, subcutaneous infusion of CL316,243 or saline vehicle (1 mg/kg/d) was provided using osmotic pumps. The perinatal outcomes, adipose tissue morphology, and metabolic and inflammatory markers were examined. RESULTS Chronic β3-AR agonist infusion induced brown adipose tissue activation and white adipose tissue browning and countered obesity-induced alterations in lipid profiles, insulin resistance, and systemic and local inflammatory states. Moreover, β3-AR activation was associated with improved placental perfusion and offspring outcomes. CONCLUSIONS Our results provide proof-of-principle evidence that pharmacological β3-AR activation may be of therapeutic potential in preventing prepregnancy-obesity-associated adverse maternal and offspring perinatal outcomes.
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Affiliation(s)
- Jun-Kai Zhang
- Logistics University of the Chinese People's Armed Police Force, Tianjin, China
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Jun Miao
- Logistics University of the Chinese People's Armed Police Force, Tianjin, China
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Zu-Qin Chen
- Logistics University of the Chinese People's Armed Police Force, Tianjin, China
- Department of MRI, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Si-Zhang Duan
- Logistics University of the Chinese People's Armed Police Force, Tianjin, China
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Xin Zhang
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Wen-Jie Ji
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Jian-Min Niu
- Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong Province, China
| | - Fei Yuan
- Department of MRI, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Xin Zhou
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
- Department of Cardiology, Tianjin Medical University General Hospital, Tianjin, China
| | - Yu-Ming Li
- Tianjin Key Laboratory of Cardiovascular Remodeling and Target Organ Injury, Characteristic Medical Center of the Chinese People's Armed Police Forces, Tianjin, China
| | - Zhuoli Zhang
- Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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Barnett SD, Buxton ILO. Hiding in Plain Sight: Nebivolol Exhibits Compelling Tocolytic Properties. J Cell Mol Med 2018; 22:6391-6395. [PMID: 30188599 PMCID: PMC6237580 DOI: 10.1111/jcmm.13883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/06/2018] [Indexed: 01/12/2023] Open
Abstract
Preterm birth before 37 weeks of completed gestation results in numerous health consequences for the foetus. Preterm labour leads to preterm birth in over 50% of cases, and no FDA‐approved treatment can prevent labour or help a foetus remain in the womb until term. Examination of nitric oxide mediated relaxation signaling in the uterine smooth muscle reveals a role for protein S‐nitrosation. The recent discovery of upregulated S‐nitrosoglutathione reductase (GSNOR) in spontaneously preterm labouring women has emphasized the need to explore the function of S‐nitrosation regulation in the maintenance of uterine quiescence. Here we have examined the ability of nebivolol to relax uterine smooth muscle and tested recent claims that nebivolol is a GSNOR inhibitor. In uterine smooth muscle strips from both mouse and human, nebivolol relaxes oxytocin‐induced contractions in a dose dependent manner. Our data indicates that nebivolol has no effect on GSNOR activity, nor does nebivolol inhibit thioredoxin reductase, two of the major protein denitrosylases. The ability of nebivolol to relax uterine smooth muscle is likely the combined effects of increased nitric oxide synthase activity and β3‐adregnegic stimulation.
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Affiliation(s)
- Scott D Barnett
- Pharmacology, University of Nevada, Reno School of Medicine, Reno, Nevada
| | - Iain L O Buxton
- Pharmacology, University of Nevada, Reno School of Medicine, Reno, Nevada
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Sharma V, Nair SV, Jaitley P, Nakade UP, Sharma A, Choudhury S, Garg SK. ATP-sensitive and maxi potassium channels regulate BRL 37344-induced tocolysis in buffaloes-an in vitro study. Theriogenology 2017; 107:194-202. [PMID: 29172176 DOI: 10.1016/j.theriogenology.2017.10.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/26/2017] [Accepted: 10/30/2017] [Indexed: 11/17/2022]
Abstract
Cellular coupling of beta3-adrenoceptors (β3-ADR) to potassium channels in myometrium is largely unknown. In vitro study was undertaken to unravel the presence of β3-adrenergic receptors (ADR) and the role of K+-channels in mediating β3-ADR-induced relaxation in isolated myometrial strips from cyclic non-pregnant water buffaloes. Isometric tension was recorded in isolated myometrial strips using data acquisition system based physiograph. Compared to SR 59230A, BRL 37344 was found to be more potent in inducing β3-dependent myometrial relaxation which was significantly (p < 0.05) inhibited in the presence of β3 antagonist, SAR 150640. The immunoreactive protein to β3-ADR was also detected in membrane fraction of myometrial protein. Further, incubation with BRL 37344 (10 μM) significantly (p < 0.05) increased c-AMP accumulation (37.58 ± 9.52 pmol/mg protein; n = 4) in the myometrial strips compared to basal c-AMP level (16.85 ± 3.87 pmol/mg protein; n = 4). The concentration response curves (CRC) of BRL 37344 were significantly (p < 0.05) shifted towards right in the presence of KATP channels specific blocker, glibenclamide (10 μM) and maxi K+-channels (BKCa) specific blocker, iberiotoxin (100 nM), with decrease in both efficacy and potency as compared to control. However, 4-aminopyridine (4-AP), a specific blocker of the voltage gated K+-channels (Kv), failed to alter the CRC of BRL 37344. Existence of immunoreactive protein to Kir6.1, α-subunit of BKCa and Kv1.1 channels were also detected in the membrane fraction of myometrial protein. Based on the above findings, it can be concluded that BRL 37344 is a potent stimulator of β3-adrenoceptors in buffalo myometrium and besides mediating their effect through rise in c-AMP, they are coupled to KATP and BKCa channels in inducing tocolytic effects.
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Affiliation(s)
- Vipin Sharma
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
| | - Sooraj V Nair
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
| | - Pooja Jaitley
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
| | - Udayraj P Nakade
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
| | - Abhishek Sharma
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
| | - Soumen Choudhury
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India.
| | - Satish Kumar Garg
- Smooth Muscle & Molecular Pharmacology Laboratory, Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science and Animal Husbandry, U.P. Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam, Go-Anusandhan Sansthan, Mathura 281001, India
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Hadi T, Douhard R, Dias AMM, Wendremaire M, Pezzè M, Bardou M, Sagot P, Garrido C, Lirussi F. Beta3 adrenergic receptor stimulation in human macrophages inhibits NADPHoxidase activity and induces catalase expression via PPARγ activation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:1769-1784. [PMID: 28723418 DOI: 10.1016/j.bbamcr.2017.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 06/22/2017] [Accepted: 07/14/2017] [Indexed: 12/22/2022]
Abstract
The beta3 adrenergic receptor (β3-AR) stimulation plays a protective role against preterm labor by blocking myometrial contraction, cytokine production, remodeling and apoptosis. We previously demonstrated that macrophage-induced ROS production in the myometrium was a key element leading to the induction of all these labor-associated features. We thus aimed to investigate if the β3-AR could be expressed in human macrophages and could trigger its protective role in the myometrium by directly inhibiting ROS production. Using lipopolysaccharide (LPS)-stimulated myometrial samples and cell co-culture experiments, we demonstrated that β3-AR stimulation inhibits the activation of the NADPH oxidase, leading to the subsequent inhibition of ROS production by macrophages. This antioxidant effect was associated with a potent anti-inflammatory response in macrophages. Furthermore, we observed that β3-AR leads to the expression of catalase not only in macrophages but also in myometrial cells, thereby preventing the transactivation of myometrial cells by hydrogen peroxide. Pharmacological experiments allowed us to demonstrate that these effects were driven by an Erk1/2-mediated activation of the antioxidant transcription factor PPARγ. These results suggest that β3-AR protective effects in the myometrium could be due to its dual antioxidant properties. Further, the effects observed in a macrophage could highlight new applications in chronic inflammatory diseases.
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Affiliation(s)
- Tarik Hadi
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; NYU Langone Medical Center, Department of Vascular Surgery, New York, NY, USA; Université de Bourgogne, Dijon, France
| | - Romain Douhard
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France
| | - Alexandre M M Dias
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France
| | - Maeva Wendremaire
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France; Centre Hospitalier Universitaire de Dijon, France
| | - Maria Pezzè
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France
| | - Marc Bardou
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France; Centre Hospitalier Universitaire de Dijon, France; INSERM CIC-P 803, Dijon, France
| | - Paul Sagot
- Centre Hospitalier Universitaire de Dijon, France; Service de Gynécologie & Obstétrique, Dijon, France
| | - Carmen Garrido
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France; Anti-cancer Center George-François Leclerc, CGFL, Dijon, France
| | - Frédéric Lirussi
- INSERM, U1231, Lipides Nutrition Cancer, Equipe labélisée Ligue Nationale contre le Cancer, Dijon, France; Université de Bourgogne, Dijon, France; Centre Hospitalier Universitaire de Dijon, France.
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7
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Altered uterine contractility in response to β-adrenoceptor agonists in ovarian cancer. J Physiol Sci 2016; 67:711-722. [PMID: 27838886 PMCID: PMC5639028 DOI: 10.1007/s12576-016-0500-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/28/2016] [Indexed: 11/29/2022]
Abstract
We aimed to prospectively examine β-adrenoceptor-mediated uterine contractility in women suffering from gynecological malignancies. Myometrial specimens were obtained from non-pregnant women undergoing hysterectomy for benign gynecological disorders, and ovarian, endometrial, synchronous ovarian–endometrial, and cervical cancer. Contractions of myometrial strips in an organ bath before and after cumulative dosages of β2- and β3-adrenoceptor agonists with preincubation of propranolol, SR 59230A, and butoxamine were studied. All agonists induced a dose-dependent attenuation for uterine contractility in endometrial or cervical cancer, similar to that observed in the reference group. Contradictory effects were observed for ovarian cancer alone or in combination with endometrial cancer. CL 316243 or ritodrine abolished the relaxation, whereas BRL 37344 increased the uterine contractility in ovarian cancer. Moreover, β-adrenoceptor antagonists caused varied effects for β2- or β3-adrenoceptor agonists. Our experiments demonstrate that ovarian cancer, alone or as synchronous ovarian–endometrial cancer, substantially alters uterine contractility in response to β-adrenoceptor agonists.
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Fernández-Martínez E, Ponce-Monter H, Soria-Jasso LE, Ortiz MI, Arias-Montaño JA, Barragán-Ramírez G, Mayén-García C. Inhibition of Uterine Contractility by Thalidomide Analogs via Phosphodiesterase-4 Inhibition and Calcium Entry Blockade. Molecules 2016; 21:molecules21101332. [PMID: 27739411 PMCID: PMC6273742 DOI: 10.3390/molecules21101332] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/21/2016] [Accepted: 09/30/2016] [Indexed: 12/02/2022] Open
Abstract
Uterine relaxation is crucial during preterm labor. Phosphodiesterase-4 (PDE-4) inhibitors have been proposed as tocolytics. Some thalidomide analogs are PDE-4 inhibitors. The aim of this study was to assess the uterus-relaxant properties of two thalidomide analogs, methyl 3-(4-nitrophthalimido)-3-(3,4-dimethoxyphenyl)-propanoate (4NO2PDPMe) and methyl 3-(4-aminophthalimido)-3-(3,4-dimethoxyphenyl)-propanoate (4APDPMe) and were compared to rolipram in functional studies of spontaneous phasic, K+-induced tonic, and Ca2+-induced contractions in isolated pregnant human myometrial tissues. The accumulation of cAMP was quantified in HeLa cells. The presence of PDE-4B2 and phosphorylated myosin light-chain (pMLC), in addition to the effect of thalidomide analogs on oxytocin-induced pMLC, were assessed in human uterine myometrial cells (UtSMCs). Thalidomide analogs had concentration-dependent inhibitory effects on spontaneous and tonic contractions and inhibited Ca2+-induced responses. Tonic contraction was equipotently inhibited by 4APDPMe and rolipram (IC50 = 125 ± 13.72 and 98.45 ± 8.86 µM, respectively). Rolipram and the thalidomide analogs inhibited spontaneous and tonic contractions equieffectively. Both analogs increased cAMP accumulation in a concentration-dependent manner (p < 0.05) and induced changes in the subcellular localization of oxytocin-induced pMLC in UtSMCs. The inhibitory effects of thalidomide analogs on the contractions of pregnant human myometrium tissue may be due to their PDE-4 inhibitory effect and novel mechanism as calcium-channel blockers.
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Affiliation(s)
- Eduardo Fernández-Martínez
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Héctor Ponce-Monter
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Luis E Soria-Jasso
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Mario I Ortiz
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - José-Antonio Arias-Montaño
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, México City 07360, México.
| | | | - Cynthia Mayén-García
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
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9
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Lai PF, Tribe RM, Johnson MR. Differential impact of acute and prolonged cAMP agonist exposure on protein kinase A activation and human myometrium contractile activity. J Physiol 2016; 594:6369-6393. [PMID: 27328735 DOI: 10.1113/jp272320] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 05/30/2016] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Over 15 million babies are born prematurely each year with approximately 1 million of these babies dying as a direct result of preterm delivery. β2 -Adrenoreceptor agonists that act via cAMP can reduce uterine contractions to delay preterm labour, but their ability to repress uterine contractions lasts ≤ 48 h and their use does not improve neonatal outcomes. Previous research has suggested that cAMP inhibits myometrial contractions via protein kinase A (PKA) activation, but this has yet to be demonstrated with PKA-specific agonists. We investigated the role of PKA in mediating cAMP-induced human myometrial relaxation, and the impact of prolonged cAMP elevation on myometrial contractility. Our findings suggest that PKA is not the sole mediator of cAMP-induced myometrial relaxation and that prolonged prophylactic elevation of cAMP alone is unlikely to prevent preterm labour (PTL). ABSTRACT Acute cAMP elevation inhibits myometrial contractility, but the mechanisms responsible are not fully elucidated and the long-term effects are uncertain. Both need to be defined in pregnant human myometrium before the therapeutic potential of cAMP-elevating agents in the prevention of preterm labour can be realised. In the present study, we tested the hypotheses that PKA activity is necessary for cAMP-induced myometrial relaxation, and that prolonged cAMP elevation can prevent myometrial contractions. Myometrial tissues obtained from term, pre-labour elective Caesarean sections were exposed to receptor-independent cAMP agonists to determine the relationship between myometrial contractility (spontaneous and oxytocin-induced), PKA activity, HSP20 phosphorylation and expression of contraction-associated and cAMP signalling proteins. Acute (1 h) application of cAMP agonists promoted myometrial relaxation, but this was weakly related to PKA activation. A PKA-specific activator, 6-Bnz-cAMP, increased PKA activity (6.8 ± 2.0 mean fold versus vehicle; P = 0.0313) without inducing myometrial relaxation. Spontaneous myometrial contractility declined after 24 h but was less marked when tissues were constantly exposed to cAMP agonists, especially for 8-bromo-cAMP (4.3 ± 1.2 mean fold versus vehicle; P = 0.0043); this was associated with changes to calponin, cofilin and HSP20 phosphorylated/total protein levels. Oxytocin-induced contractions were unaffected by pre-incubation with cAMP agonists despite treatments being able to enhance PKA activity and HSP20 phosphorylation. These data suggest that cAMP-induced myometrial relaxation is not solely dependent on PKA activity and the ability of cAMP agonists to repress myometrial contractility is lost with prolonged exposure. We conclude that cAMP agonist treatment alone may not prevent preterm labour.
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Affiliation(s)
- Pei F Lai
- Academic Department of Obstetrics & Gynaecology, Imperial College London, London, SW10 9NH, UK
| | - Rachel M Tribe
- Division of Women's Health, Kings College London and Women's Health Academic Centre, Kings Health Partners, London, SE1 7EH, UK
| | - Mark R Johnson
- Academic Department of Obstetrics & Gynaecology, Imperial College London, London, SW10 9NH, UK.
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10
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Sipes NS, Martin MT, Kothiya P, Reif DM, Judson RS, Richard AM, Houck K, Dix DJ, Kavlock RJ, Knudsen TB. Profiling 976 ToxCast chemicals across 331 enzymatic and receptor signaling assays. Chem Res Toxicol 2013; 26:878-95. [PMID: 23611293 PMCID: PMC3685188 DOI: 10.1021/tx400021f] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Indexed: 11/30/2022]
Abstract
Understanding potential health risks is a significant challenge due to the large numbers of diverse chemicals with poorly characterized exposures and mechanisms of toxicities. The present study analyzes 976 chemicals (including failed pharmaceuticals, alternative plasticizers, food additives, and pesticides) in Phases I and II of the U.S. EPA's ToxCast project across 331 cell-free enzymatic and ligand-binding high-throughput screening (HTS) assays. Half-maximal activity concentrations (AC50) were identified for 729 chemicals in 256 assays (7,135 chemical-assay pairs). Some of the most commonly affected assays were CYPs (CYP2C9 and CYP2C19), transporters (mitochondrial TSPO, norepinephrine, and dopaminergic), and GPCRs (aminergic). Heavy metals, surfactants, and dithiocarbamate fungicides showed promiscuous but distinctly different patterns of activity, whereas many of the pharmaceutical compounds showed promiscuous activity across GPCRs. Literature analysis confirmed >50% of the activities for the most potent chemical-assay pairs (54) but also revealed 10 missed interactions. Twenty-two chemicals with known estrogenic activity were correctly identified for the majority (77%), missing only the weaker interactions. In many cases, novel findings for previously unreported chemical-target combinations clustered with known chemical-target interactions. Results from this large inventory of chemical-biological interactions can inform read-across methods as well as link potential targets to molecular initiating events in adverse outcome pathways for diverse toxicities.
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Affiliation(s)
- Nisha S. Sipes
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Matthew T. Martin
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Parth Kothiya
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - David M. Reif
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Richard S. Judson
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Ann M. Richard
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Keith
A. Houck
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - David J. Dix
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Robert J. Kavlock
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
| | - Thomas B. Knudsen
- National
Center for Computational Toxicology, Office
of Research and Development, U.S. Environmental Protection
Agency, Research Triangle Park, North Carolina 27711,
United States
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11
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Hadi T, Barrichon M, Mourtialon P, Wendremaire M, Garrido C, Sagot P, Bardou M, Lirussi F. Biphasic Erk1/2 activation sequentially involving Gs and Gi signaling is required in beta3-adrenergic receptor-induced primary smooth muscle cell proliferation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:1041-51. [PMID: 23388888 DOI: 10.1016/j.bbamcr.2013.01.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 01/02/2013] [Accepted: 01/18/2013] [Indexed: 01/13/2023]
Abstract
The beta3 adrenergic receptor (B3-AR) reportedly induces cell proliferation, but the signaling pathways that were proposed, involving either Gs or Gi coupling, remain controversial. To further investigate the role of G protein coupling in B3-AR induced proliferation, we stimulated primary human myometrial smooth muscle cells with SAR150640 (B3-AR agonist) in the absence or presence of variable G-protein inhibitors. Specific B3-AR stimulation led to an Erk1/2 induced proliferation. We observed that the proliferative effects of B3-AR require two Erk1/2 activation peaks (the first after 3min, the second at 8h). Erk1/2 activation at 3min was mimicked by forskolin (adenylyl-cyclase activator), and was resistant to pertussis toxin (Gi inhibitor), suggesting a Gs protein signaling. This first signaling also required the downstream Gs signaling effectors PKA and Src. However, Erk1/2 activation at 8h turned out to be pertussis toxin-dependent, and PKA-independent, indicating a Gi signaling pathway in which Src and PI3K were required. The pharmacological inhibition of both the Gs and Gi pathway abolished B3-AR-induced proliferation. Altogether, these data indicate that B3-AR-induced proliferation depends on the biphasic activation of Erk1/2 sequentially induced by the Gs/PKA/Src and Gi/Src/PI3K signaling pathways.
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12
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Bakos J, Strbak V, Paulikova H, Krajnakova L, Lestanova Z, Bacova Z. Oxytocin receptor ligands induce changes in cytoskeleton in neuroblastoma cells. J Mol Neurosci 2013; 50:462-8. [PMID: 23335033 DOI: 10.1007/s12031-013-9960-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 01/10/2013] [Indexed: 11/29/2022]
Abstract
Aim of the present study was to evaluate effects of ligands of oxytocin receptors on gene expression of neurofilament proteins (nestin and microtubule-associated protein 2 (MAP2)) associated with neuronal differentiation and growth factors (brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF)) related to neuronal growth. Fluorescent staining of F-actin was used to observe morphology of cells. Co-treatment with oxytocin and oxytocin receptor antagonist--atosiban--resulted in significant increase of MAP2 gene expression in SK-N-SH cells. There was no effect of oxytocin on gene expression of growth factors BDNF and NGF. Surprisingly, oxytocin with atosiban significantly increased mRNA levels for both BDNF and NGF. Gene expression of vasopressin receptor (V1aR) significantly decreased in response to vasopressin. Atosiban decreased mRNA levels for oxytocin receptor (OXTR) and V1aR. Oxytocin significantly decreased OXTR and nestin mRNA levels and increased mRNA levels for BDNF and NGF in U-87 MG cells. The densest recruitment of F-actin filaments was observed in apical parts of filopodia in SK-N-SH cells incubated in oxytocin presence. Present data demonstrate complex role of ligands of oxytocin receptors in regulation of gene expression of intermediate filaments and thus, oxytocin might be considered as a growth factor in neuronal type of cells.
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Affiliation(s)
- Jan Bakos
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlarska 3, Bratislava, Slovakia.
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13
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Parida S, Uttam Singh T, Ravi Prakash V, Mishra SK. Molecular and functional characteristics of β3-adrenoceptors in late pregnant mouse uterus: A comparison with β2-adrenoceptors. Eur J Pharmacol 2013; 700:74-9. [DOI: 10.1016/j.ejphar.2012.11.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 11/23/2012] [Accepted: 11/27/2012] [Indexed: 11/28/2022]
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14
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Specificity evaluation of antibodies against human β3-adrenoceptors. Naunyn Schmiedebergs Arch Pharmacol 2012; 385:875-82. [PMID: 22688595 DOI: 10.1007/s00210-012-0767-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 05/24/2012] [Indexed: 10/27/2022]
Abstract
β(3)-Adrenoceptors are a promising drug target for the treatment of urinary bladder dysfunction, but knowledge about their expression at the protein level and their functional role is limited, partly due to a lack of well validated tools. As many antibodies against G-protein-coupled receptors, including those against β(3)- and other β-adrenoceptor subtypes, lack selectivity for their target, we have evaluated the specificity of five antibodies raised against the full-length protein of the human β(3)-adrenoceptor (H155-B01), its N-terminus (LSA4198 and TA303277) and its C-terminus (AB5122, Sc1472) in immunoblotting and immunocytochemistry. Our primary test system were Chinese hamster ovary cells stably transfected to express each of the three human β-adrenoceptor subtypes at near physiological levels (100-200 fmol/mg protein). None of the five antibodies exhibited convincing target specificity in immunoblotting with Sc1472 apparently being least unsuitable. In immunocytochemistry, LSA4198 and Sc1472 appeared most promising, exhibiting at least some degree of specificity. As these two antibodies have been raised against different epitopes (N- and C-terminus of the receptor, respectively), we propose that concordant staining by both antibodies provides the most convincing evidence for β(3)-adrenoceptor labelling in cyto- or histochemistry studies.
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Kaya T, Karadas B, Altun A, Sarac İ, Bagcivan I. Effects and selectivity of CL 316243, beta-3-adrenoceptor agonist, in term-pregnant rat myometrium. Gynecol Obstet Invest 2011; 73:63-9. [PMID: 22189156 DOI: 10.1159/000332393] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 08/17/2011] [Indexed: 01/09/2023]
Abstract
BACKGROUND/AIMS Recent evidence supports a predominant role of β(3)-adrenoceptors at the end of pregnancy in myometrium. This study was designed to characterize the pharmacology of the selective β(3)-adrenoceptor agonist CL 316243 on oxytocin-induced myometrial contractions and the levels of cAMP and cGMP of myometrial strips isolated from term-pregnant rats. METHODS Myometrial strips were obtained from term-pregnant Wistar albino rats (n = 10), mounted in organ baths and tested for changes in isometric tension in response to CL 316243 (10(-10)-10(-5) M) on oxytocin-induced myometrial contractions. Effects of CL 316243 on cAMP and cGMP levels in isolated myometrial strips (n = 8) were evaluated by radioimmunoassay kits. We evaluated the effect of increasing concentrations of CL 316243 on myometrial contractions and on contractions of myometrial smooth muscle pretreated with metoprolol, ICI 118.551 and SR 59230A (β(1)-, β(2)-, β(3)-adrenoceptor antagonists, respectively, 10(-6) M). RESULTS The inhibition of the amplitude of oxytocin-induced contractions by CL 316243 were antagonized with SR 59230A (10(-6) M), but they were not changed by metoprolol (10(-6) M) or ICI 118.551 (10(-6) M). CL 316243 increased cAMP levels compared to the control group. CL 316243 increased cGMP levels, in the CL 316243 group more than in the control group, but this increase is less significant than cAMP levels. CONCLUSION These results demonstrate that the inhibition of rat myometrial contractions with CL 316243 is mediated by β(3)-adrenoceptor subtype and increased cAMP and cGMP levels.
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Affiliation(s)
- Tijen Kaya
- Department of Pharmacology, Cumhuriyet University School of Medicine, Sivas, Turkey.
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16
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Perrone MG, Bleve L, Santandrea E, Vitale P, Niso M, Scilimati A. The tertiary amine nitrogen atom of piperazine sulfonamides as a novel determinant of potent and selective beta3-adrenoceptor agonists. ChemMedChem 2010; 4:2080-97. [PMID: 19882697 DOI: 10.1002/cmdc.200900292] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Novel compounds were prepared in fair to good yields as human beta(3)-adrenoceptor (beta(3)-AR) agonists. In particular, aryloxypropanolamines 7 a-d (EC(50)=0.57-2.1 nM) and arylethanolamines 12 a,b,e (EC(50)=6.38-19.4 nM) were designed to explore the effects of modifications at the right-hand side of these molecules on their activity as beta(3)-AR agonists. Piperidine sulfonamides 15 a-c, e-g (EC(50)=6.1-36.2 nM) and piperazine sulfonamide derivatives 20-29 (EC(50)=1.79-49.3 nM) were examined as compounds bearing a non-aromatic linker on the right- and left-hand sides of the molecules. Some piperazine sulfonamides were found to be potent and selective beta(3)-AR agonists, even if the amine nitrogen atom is tertiary and not secondary, as is the case for all beta(3)-AR agonists reported so far. (S)-3-{4-{N-{4-{2-[2-Hydroxy-3-(4-hydroxyphenoxy)propylamino]ethyl}phenyl}sulfamoyl}phenoxy}propanoic acid (7 d; EC(50)=0.57 nM), (R)-N-{4-[2-(2-hydroxy-2-phenylethylamino)ethyl]phenyl}-4-(3-octylureido)benzenesulfonamide (12 e; EC(50)=6.38 nM), (R)-2-[1-(4-methoxyphenylsulfonyl)piperidin-4-ylamino]-1-phenylethanol (15 f; EC(50)=6.1 nM), and (S)-4-{2-hydroxy-3-[4-(4-methoxyphenylsulfonyl)piperazin-1-yl]propoxy}phenol (25; EC(50)=1.79 nM) were found to be the most potent beta(3)-AR agonists of the aryloxypropanolamine, arylethanolamine, piperidine sulfonamide, and piperazine sulfonamide classes, respectively. The two most potent compounds were identified as possible candidates for further development of beta(3)-AR agonists useful in the treatment of beta(3)-AR-mediated pathological conditions.
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Affiliation(s)
- Maria Grazia Perrone
- Dipartimento Farmaco-Chimico, Università degli Studi di Bari A. Moro, Via Orabona 4, 70125 Bari, Italy
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Lirussi F, O'Brien M, Wendremaire M, Goirand F, Sagot P, Dumas M, Morrison JJ, Bardou M. SAR150640, a selective beta3-adrenoceptor agonist, prevents human myometrial remodelling and activation of matrix metalloproteinase in an in vitro model of chorioamnionitis. Br J Pharmacol 2010; 159:1354-66. [PMID: 20136828 DOI: 10.1111/j.1476-5381.2009.00616.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE The uterine pathophysiology underlying inflammatory conditions such as chorioamnionitis remains largely unclear. As we have shown that beta(3)-adrenoceptors act as regulators of myometrial inflammation, we wanted to investigate the potential role of beta(3)-adrenoceptors in preventing uterine remodelling induced by inflammation. EXPERIMENTAL APPROACH The consequences of human chorioamnionitis on myometrial remodelling were characterized by Sirius Red staining and metalloproteinase (MMP) expression, and compared with the effects of incubating human myometrial samples with Escherichia coli lipopolysaccharide (LPS) in vitro. We also assessed the effect of SAR150640, a selective beta(3)-adrenoceptor agonist, on the production and activity of MMPs. KEY RESULTS Chorioamnionitis was associated with a 46% decrease in total collagen, as well as over-expression of MMP2 (+61%) and MMP9 (+84%); both effects were reproduced by incubation with LPS (10 microg x mL(-1), 48 h). LPS-induced over-expression of MMP2 and MMP9 in normal human myometrium was paralleled by an overactivity of the proteins. Both over-expression and overactivity were prevented by the beta(3)-adrenoceptor agonist SAR150640 in a concentration-dependent manner. SAR150640, by itself, did not exhibit any effect on MMP production in control tissues. CONCLUSIONS AND IMPLICATIONS This study shows that inflammation was associated with an intense remodelling of human myometrium, a process likely to be explained by MMP activation. Our study emphasizes the potential therapeutic relevance of beta(3)-adrenoceptor agonists to the treatment of preterm labour and other uterine inflammatory conditions.
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Affiliation(s)
- F Lirussi
- Centre d'Investigations Cliniques plurithématique 803 (INSERM CIC-P 803), Dijon, France
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18
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Perrone MG, Santandrea E, Bleve L, Vitale P, Colabufo NA, Jockers R, Milazzo FM, Sciarroni AF, Scilimati A. Stereospecific synthesis and bio-activity of novel beta(3)-adrenoceptor agonists and inverse agonists. Bioorg Med Chem 2007; 16:2473-88. [PMID: 18083578 DOI: 10.1016/j.bmc.2007.11.060] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2007] [Revised: 11/13/2007] [Accepted: 11/21/2007] [Indexed: 11/29/2022]
Abstract
Since it is widely distributed into the body, beta(3)-adrenoceptor is becoming an attractive target for the treatment of several pathologies such as obesity, type 2 diabetes, metabolic syndrome, cachexia, overactive bladder, ulcero-inflammatory disorder of the gut, preterm labour, anxiety and depressive disorders, and heart failure. New compounds belonging to the class of arylethanolamines bearing one or two stereogenic centres were prepared in good yields as racemates and optically active forms. They were, then, evaluated for their intrinsic activity towards beta(3)-adrenoceptor and their affinity for beta(1)- and beta(2)-adrenergic receptors. Stereochemical features were found to play a crucial role in determining the behaviour of such compounds. In particular, alpha-racemic, (alphaR)- and (alphaS)-2-{4-[2-(2-hydroxy-2-phenylethylamino)ethyl]phenoxy}-2- methylpropanoic acid, (alpha-rac, beta-rac)-, (alphaR, betaS)- and (alphaR, betaR)- 2-{4-[2-(2-hydroxy-2-phenylethylamino)ethyl]phenoxy}propanoic acid were found to be endowed with beta(3)-adrenoceptor agonistic activity. Whereas, (alphaS, betaS)- and (alphaS, betaR)-2-{4-[2-(2-hydroxy-2-phenylethylamino)ethyl]phenoxy}propanoic acid behaved as beta(3)-adrenoceptor inverse agonists. Such compounds showed no affinity for beta(1)- and beta(2)-adrenergic receptor, respectively. Thus, resulting highly selective beta(3)-adrenoceptor ligands.
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Affiliation(s)
- Maria Grazia Perrone
- Dipartimento Farmaco-Chimico, Università di Bari, Via E.Orabona 4, 70125 Bari, Italy
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Lirussi F, Rakotoniaina Z, Madani S, Goirand F, Breuiller-Fouché M, Leroy MJ, Sagot P, Morrison JJ, Dumas M, Bardou M. ADRB3 adrenergic receptor is a key regulator of human myometrial apoptosis and inflammation during chorioamnionitis. Biol Reprod 2007; 78:497-505. [PMID: 17989355 DOI: 10.1095/biolreprod.107.064444] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The pathophysiology underlying preterm labor triggered by inflammatory conditions such as chorioamnionitis remains largely unclear. It has already been suggested that beta-3 adrenergic (ADRB3) agonists might be of interest in the pharmacological management of preterm labor. Although there is evidence implicating ADRB receptors in the control of inflammation, there are minimal data relating specifically to ADRB3. To explore the cellular consequences of chorioamnionitis and detect apoptosis, we first performed immunostaining and Western blot experiments on human myometrial samples obtained from women with confirmed chorioamnionitis. We then developed an in vitro model of chorioamnionitis by incubating the myometrial samples obtained from uncomplicated pregnancies with Escherichia coli lipopolysaccharide (LPS). We observed that chorioamnionitis was associated with a significant increase in cleaved CASP3 protein expression, as well as chromatin condensation, which were reproduced experimentally by LPS stimulation (10 microg/ml, 48 h). Lipopolysaccharide stimulation of normal human myometrium also induced CASP3 transcripts, increased the proapoptotic marker BAX, and decreased the antiapoptotic marker BCL2. Lipopolysaccharide-induced apoptosis was antagonized by neutralization of secreted tumor necrosis factor by a specific antibody. Furthermore, LPS stimulation increased medium culture levels of proinflammatory cytokines interleukin 6 (IL6) and IL8. Lipopolysaccharide-induced apoptosis and cytokine production were prevented by the new and potent ADRB3 agonist SAR150640 in a concentration-dependent manner. SAR150640 by itself did not exhibit any effect on apoptosis or cytokine production in control tissues. This study shows that chorioamnionitis is associated with apoptosis of human myometrial cells. It emphasizes the potential therapeutic interest of ADRB3 agonists in the field of preterm labor and other inflammatory conditions.
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Affiliation(s)
- Fréderic Lirussi
- Laboratoire de Physiologie et Pharmacologie Cardiovasculaires Expérimentales (LPPCE, EA279, IFR Santé-STIC), Faculté de Médecine, Université de Bourgogne, Dijon, France
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