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Bozkurt G, Kaya F, Yildiz M. Does maropitant provide more effective perioperative pain management than meloxicam in bitches undergoing ovariohysterectomy? The first report on the comparison of visceral algesia-analgesia for ovariohysterectomy. Res Vet Sci 2024; 169:105179. [PMID: 38335894 DOI: 10.1016/j.rvsc.2024.105179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 02/04/2024] [Accepted: 02/05/2024] [Indexed: 02/12/2024]
Abstract
Ovariohysterectomy (OVH) is a widely used surgical procedure in small animal practice. In developing countries, injectable anesthetics such as ketamine and xylazine are commonly used in veterinary medicine. Pharmacological agents with analgesic activity, such as ketamine and meloxicam, are not sufficiently effective in reducing visceral pain. Therefore, this study aimed to investigate the visceral analgesia and anti-inflammatory effectiveness of maropitant compared with those of meloxicam during and after OVH in bitches. In this study, thirty-six bitches were randomly divided into the maropitant, meloxicam, and control groups. The heart rate (HR), peripheral oxygen saturation, and respiratory rate were monitored during the procedure. Pain scores were assessed using the University of Melbourne pain scale (UMPS). Rescue analgesia was not necessary for any bitch at any time point. Blood samples were collected before anesthesia induction and 24 h after the operation to determine C-reactive protein (CRP) levels. No significant difference was observed in HR between the control and meloxicam groups when the right ovary was removed, and the HR of the maropitant group was significantly (p < 0.05) lower than that of the control group. The pain scores of the maropitant group were significantly (p < 0.05) lower than those of the other groups. However, no significant differences were observed in CRP levels between the groups. In conclusion, compared to meloxicam, maropitant provided more effective visceral analgesia in bitches undergoing OVH, although no significant difference was found in its anti-inflammatory effect.
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Affiliation(s)
- Gokhan Bozkurt
- Burdur Mehmet Akif Ersoy University, Faculty of Veterinary Medicine, Department of Obstetrics and Gynecology, Burdur, Türkiye.
| | - Feyyaz Kaya
- Balikesir University, Faculty of Veterinary Medicine, Department of Internal Medicine, Balikesir, Türkiye
| | - Mehmet Yildiz
- Burdur Mehmet Akif Ersoy University, Faculty of Veterinary Medicine, Department of Obstetrics and Gynecology, Burdur, Türkiye
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Isorna I, González-Moles MÁ, Muñoz M, Esteban F. Substance P and Neurokinin-1 Receptor System in Thyroid Cancer: Potential Targets for New Molecular Therapies. J Clin Med 2023; 12:6409. [PMID: 37835053 PMCID: PMC10573850 DOI: 10.3390/jcm12196409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/11/2023] [Accepted: 10/07/2023] [Indexed: 10/15/2023] Open
Abstract
In recent years, numerous approaches have been developed to comprehend the molecular alterations underlying thyroid cancer (TC) oncogenesis and explore novel therapeutic strategies for TC. It is now well established that the neurokinin-1 receptor (NK-1R) is overexpressed in cancer cells and that NK-1R is essential for the viability of cancer cells. The binding of substance P (SP) to NK-1R in neoplastic cells plays a pivotal role in cancer progression by promoting neoplastic cell growth, protecting tumor cells from apoptosis, triggering invasion and metastasis through the enhanced migration of cancer cells, and stimulating endothelial cell proliferation for tumor angiogenesis. Remarkably, all types of human TC (papillary, follicular, medullary, anaplastic), as well as metastatic lesions, exhibit the overexpression of SP and NK-1R compared to the normal thyroid gland. TC cells synthesize and release SP, which exerts its multiple functions through autocrine, paracrine, intracrine, and neuroendocrine processes, including the regulation of tumor burden. Consequently, the secretion of SP from TC results in increased SP levels in plasma, which are significantly higher in TC patients compared to controls. Additionally, NK-1R antagonists have demonstrated a dose-dependent antitumor action. They impair cancer cell proliferation on one side and induce apoptosis of tumor cells on the other side. Furthermore, it has been demonstrated that NK-1R antagonists inhibit neoplastic cell migration, thereby impairing both invasiveness and metastatic abilities, as well as angiogenesis. Given the consistent overexpression of NK-1R in all types of TC, targeting this receptor represents a promising therapeutic approach for TC. Therefore, NK-1R antagonists, such as the drug aprepitant, may represent novel drugs for TC treatment.
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Affiliation(s)
- Inmaculada Isorna
- Department of Otorhinolaryngology, Hospital Universitario Virgen del Rocio, 41013 Seville, Spain; (I.I.); (F.E.)
| | | | - Miguel Muñoz
- Research Laboratory on Neuropeptides, Institute of Biomedicine of Seville (IBiS), 41013 Seville, Spain
| | - Francisco Esteban
- Department of Otorhinolaryngology, Hospital Universitario Virgen del Rocio, 41013 Seville, Spain; (I.I.); (F.E.)
- School of Medicine, University of Seville, 41009 Seville, Spain
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Temporospatial Expression of Neuropeptide Substance P in Dental Pulp Stem Cells During Odontoblastic Differentiation in Vitro and Reparative Dentinogenesis in Vivo. J Endod 2023; 49:276-285. [PMID: 36549466 DOI: 10.1016/j.joen.2022.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/26/2022] [Accepted: 12/02/2022] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Substance P (SP) is a neuropeptide released from the nervous fibers in response to injury. In addition to its association with pain and reactions to anxiety and stress, SP exerts various physiological functions by binding to the neurokinin-1 receptor (NK1R). However, the expression and role of SP in reparative dentinogenesis remain elusive. Here, we explored whether SP is involved in odontoblastic differentiation during reparative dentinogenesis. METHODS Dental pulp stem cells (DPSCs) were isolated from healthy human dental pulp tissues and subjected to odontoblastic differentiation. The expression of SP and NK1R during odontoblastic differentiation was investigated in vitro. The effects of SP on odontoblastic differentiation of DPSCs were evaluated using alizarin red staining, alkaline phosphatase staining, and real-time polymerase chain reaction. After direct pulp capping with mineral trioxide aggregate, the expression of SP and NK1R during reparative dentin formation in rats were identified using histological and immunohistochemical staining. RESULTS SP and NK1R expression increased during the odontoblastic differentiation of DPSCs. SP translocated to the nucleus when DPSCs were exposed to differentiation medium. NK1R was always present in the nuclei of DPSCs and odontoblast-like cells. Additionally, we discovered that 10-8 M SP marginally enhanced the odontoblastic differentiation of DPSCs, and that these effects could be impaired by the NK1R antagonist. Furthermore, SP and NK1R were expressed in odontoblast-like and dental pulp cells during reparative dentin formation in vivo. CONCLUSIONS SP contributes to odontoblastic differentiation during reparative dentin formation by binding to the NK1R.
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Zhang H, Liu G, Mao X, Yang L, Wang B, Yuan X. LncRNA MEG3 induces endothelial differentiation of mouse derived adipose-derived stem cells by targeting MiR-145-5p/KLF4. Mol Biol Rep 2022; 49:8495-8505. [PMID: 35802277 DOI: 10.1007/s11033-022-07671-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 06/01/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND The present study aimed to investigate the mechanisms through which long non-coding RNA (lncRNA) maternally expressed 3 (MEG3) affected the endothelial differentiation of mouse derived adipose-derived stem cells (ADSCs). MATERIALS AND METHODS ADSCs were isolated and identified by specific surface marker detection. The effects of lncRNA MEG3 on endothelial differentiation of ADSCs were also detected via quantitative PCR, western blotting, immunofluorescence and Matrigel angiogenesis assays. In addition, using target gene prediction tools and luciferase reporter assays, the downstream target gene was demonstrated. RESULTS LncRNA MEG3 targeted and reduced the expression levels of microRNA-145-5p (miR-145-5p), which upregulated the expression levels of Krüppel like factor 4 (KLF4), promoting endothelial differentiation of ADSCs. CONCLUSION LncRNA MEG3 induced endothelial differentiation of ADSCs by targeting miR-145-5p/KLF4, which may provide novel insights to illustrate the mechanism of endothelial differentiation of ADSCs.
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Affiliation(s)
- Hailong Zhang
- Department of Dermatology, First Affiliated Hospital of Heilongjiang University of Traditional Chinese Medicine, Harbin, 150006, Heilongjiang, People's Republic of China
| | - Gang Liu
- Department of Medicine, Second Affiliated Hospital of Heilongjiang University of Traditional Chinese Medicine, Harbin, 150006, Heilongjiang, People's Republic of China
| | - Xu Mao
- Department of Health Center, Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang, People's Republic of China
| | - Lei Yang
- Department of Medicine, Heilongjiang Academy of Traditional Chinese Medicine, No. 33 of West Dazhi Street, Harbin, 150001, Heilongjiang, People's Republic of China
| | - Bingyu Wang
- Department of Medicine, Heilongjiang Academy of Traditional Chinese Medicine, No. 33 of West Dazhi Street, Harbin, 150001, Heilongjiang, People's Republic of China.
| | - Xingxing Yuan
- Department of Medicine, Heilongjiang Academy of Traditional Chinese Medicine, No. 33 of West Dazhi Street, Harbin, 150001, Heilongjiang, People's Republic of China.
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The Neurokinin-1 Receptor Is Essential for the Viability of Human Glioma Cells: A Possible Target for Treating Glioblastoma. BIOMED RESEARCH INTERNATIONAL 2022; 2022:6291504. [PMID: 35434136 PMCID: PMC9006081 DOI: 10.1155/2022/6291504] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 01/20/2022] [Accepted: 03/14/2022] [Indexed: 12/18/2022]
Abstract
Background Glioblastoma or glioma is the most common malignant brain tumor. Patients have a prognosis of approximately 15 months, despite the current aggressive treatment. Neurokinin-1 receptor (NK-1R) occurs naturally in human glioma, and it is necessary for the tumor development. Objective The purpose of the study was to increase the knowledge about the involvement of the substance P (SP)/NK-1R system in human glioma. Methods Cellular localization of NK-1R and SP was studied in GAMG and U-87 MG glioma cell lines by immunofluorescence. The contribution of both SP and NK-1R to the viability of these cells was also assessed after applying the tachykinin 1 receptor (TAC1R) or the tachykinin 1 (TAC1) small interfering RNA gene silencing method, respectively. Results Both SP and the NK-1R (full-length and truncated isoforms) were localized in the nucleus and cytoplasm of GAMG and U-87 MG glioma cells. The presence of full-length NK-1R isoform was mainly observed in the nucleus, while the level of truncated isoform was higher in the cytoplasm. Cell proliferation was decreased when glioma cells were transfected with TAC1R siRNA, but not with TAC1. U-87 MG cells were more sensitive to the effect of the TAC1R inhibition than GAMG cells. The decrease in the number of glioma cells after silencing of the TAC1R siRNA gene was due to apoptotic and necrotic mechanisms. In human primary fibroblast cultured cells, TAC1R silencing by siRNA did not produce any change in cell viability. Conclusions Our results show for the first time that the expression of the TAC1R gene (NK-1R) is essential for the viability of GAMG and U-87 MG glioma cells. On the contrary, the TAC1R gene is not essential for the viability of normal cells, confirming that NK-1R could be a promising and specific therapeutic target for the treatment of glioma.
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Atas U, Erin N, Tazegul G, Elpek GO, Yildirim B. Changes in ghrelin, substance P and vasoactive intestinal peptide levels in the gastroduodenal mucosa of patients with morbid obesity. Neuropeptides 2021; 89:102164. [PMID: 34146741 DOI: 10.1016/j.npep.2021.102164] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 05/31/2021] [Accepted: 05/31/2021] [Indexed: 02/08/2023]
Abstract
AIMS The aim of the study was to assess changes in levels of substance P (SP), vasoactive intestinal peptide (VIP) and ghrelin in the gastroduodenal mucosa of obese individuals, which has not been studied before. METHODS Forty-six patients with a body mass index (BMI) of >40 kg/m2 and 20 patients with a BMI of 18-25 kg/m2 were included in the study. VIP and SP levels in the fundus, antrum and duodenal mucosa were measured in freshly frozen tissues using enzyme-linked immunosorbent assay (ELISA). Fasting levels of ghrelin in blood were also measured with ELISA. Tissue levels of ghrelin were assessed by immunohistochemical staining, and immunoreactivity scores were used for ghrelin evaluation in tissues. RESULTS Antrum SP levels were higher in the obese group than in the control group. A significant number of obese patients had low VIP levels in the fundus and antrum. Intense ghrelin staining was observed in a limited number of cells in the mucosal area of the gastric fundus that was similar in the control and patient groups. In the antrum and duodenum, ghrelin staining was low in all the samples examined. CONCLUSION Here, we found that SP levels are increased, while VIP levels are decreased in the antrum of morbidly obese individuals. Previous studies show that SP increases gastroduodenal motility, that VIP slows it down, and that the gastric emptying rate is higher in obese individuals, preventing negative feedback mechanisms upon food intake. Therefore, increases in SP and decreases in VIP levels in the antrum may contribute to obesity by accelerating gastric emptying.
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Affiliation(s)
- Unal Atas
- Akdeniz University Faculty of Medicine, Department of Internal Medicine, Antalya, Turkey.
| | - Nuray Erin
- Akdeniz University Faculty of Medicine, Department of Medical Pharmacology and Immunopharmacology and Immunooncology Unit, Antalya, Turkey.
| | - Gokhan Tazegul
- Akdeniz University Faculty of Medicine, Department of Internal Medicine, Antalya, Turkey.
| | - Gulsum Ozlem Elpek
- Akdeniz University Faculty of Medicine, Department of Pathology, Antalya, Turkey.
| | - Bulent Yildirim
- Akdeniz University Faculty of Medicine, Department of Gastroenterology, Antalya, Turkey.
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Continuous Infusion of Ketamine and Lidocaine Either with or without Maropitant as an Adjuvant Agent for Analgesia in Female Dogs Undergoing Mastectomy. Vet Med Int 2021; 2021:4747301. [PMID: 33575023 PMCID: PMC7857926 DOI: 10.1155/2021/4747301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 11/26/2020] [Accepted: 01/02/2021] [Indexed: 11/17/2022] Open
Abstract
Maropitant, an antagonist of neurokinin-1 (NK-1) receptors, blocks the pharmacological action of substance P on the central and peripheral nervous systems. The objective of this study was to compare the antinociceptive and cardiorespiratory effects of the continuous intraoperative infusion of maropitant with ketamine and lidocaine in female dogs undergoing unilateral radical mastectomy. Twenty-four female dogs were used and were divided randomly into two groups (n = 12). The GLK group received ketamine bolus (1.0 mg/kg), lidocaine bolus (1.5 mg/kg), and continuous infusion of ketamine and lidocaine (10 mcg/kg/min and 50 mcg/kg/min), respectively; the GLKM group received the same anesthetic protocol combined with maropitant bolus (1.5 mg/kg/IV) and continuous infusion of maropitant (100 mcg/kg/h). Continuous infusion was initiated at the start of surgery and was maintained until 1 hour postoperatively. Pain was evaluated in the postoperative period using four scales and a digital analgesimeter. Data were analysed using analysis of variance, Student's t-test, Mann–Whitney test, and Friedman's test (P < 0.05). Kaplan–Meier curves were compared using the log-rank test. The results indicated lower pain scores, better survival curves with a lower number of patients requiring rescue analgesia, and lower peripheral sensitization, in the GLKM group than in the GLK group. It was concluded that the coadministration of maropitant with ketamine and lidocaine had an adjuvant effect with minimal cardiorespiratory effects and effective analgesia, improving pain management and patient comfort.
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Jeong YM, Cheng XW, Lee KH, Lee S, Cho H, Kim W. Substance P enhances the local activation of NK 1R-expressing c-kit + cardiac progenitor cells in right atrium of ischemia/reperfusion-injured heart. BMC Mol Cell Biol 2020; 21:41. [PMID: 32517655 PMCID: PMC7285458 DOI: 10.1186/s12860-020-00286-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 06/01/2020] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Localization of neurokinin 1 receptor (NK1R), the endogenous receptor for neuropeptide substance P (SP), has already been described for the right atrium (RA) of the heart. However, the biological role of SP/NK1R signal pathways in the RA remains unclear. Sprague-Dawley rats were randomly divided into 4 groups (n = 22 each); subjected to sham, ischemia/reperfusion-injury (I/R), I/R with 5 nmole/kg SP injection (SP + I/R), and SP + I/R with 1 mg/kg RP67580 injection (RP, a selective non-peptide tachykinin NK1R antagonist) (RP/SP + I/R). The left anterior descending coronary artery was occluded for 40 min followed by 1 day reperfusion with SP or SP + RP or without either. After 1 day, both atria and ventricles as well as the heart apexes were collected. RESULTS SP promoted the expression of c-Kit, GATA4, Oct4, Nanog, and Sox2 in only the RA of the SP + I/R rats via NK1R activation. In agreement with these observations, NK1R-expressing c-Kit+ Nkx2.5+GATA4+ cardiac progenitor cells (CPCs) in the ex vivo RA explant outgrowth assay markedly migrated out from RA1 day SP + I/R approximately 2-fold increase more than RA1 day I/R. Treatment of SP promoted proliferation, migration, cardiosphere formation, and potential to differentiate into cardiomyocytes. Using RP inhibitor, NK1R antagonist not only inhibited cell proliferation and migration but also reduced the formation of cardiosphere and differentiation of c-Kit+ CPCs. CONCLUSION SP/NK1R might play a role as a key mediator involved in the cellular response to c-Kit+ CPC expansion in RA of the heart within 24 h after I/R.
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Affiliation(s)
- Yun-Mi Jeong
- Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea.,Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak Street, Si-heung City, Republic of Korea
| | - Xian Wu Cheng
- The Department of Cardiology, Yanbian University Hospital, Yanji, China
| | - Kyung Hye Lee
- Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea
| | - Sora Lee
- Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea
| | - Haneul Cho
- Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea
| | - Weon Kim
- Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea.
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The Neurokinin-1 Receptor Antagonist Aprepitant, a New Drug for the Treatment of Hematological Malignancies: Focus on Acute Myeloid Leukemia. J Clin Med 2020; 9:jcm9061659. [PMID: 32492831 PMCID: PMC7355887 DOI: 10.3390/jcm9061659] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/09/2020] [Accepted: 05/28/2020] [Indexed: 12/11/2022] Open
Abstract
Acute myeloid leukemia (AML) is a heterogeneous hematological malignancy. To treat the disease successfully, new therapeutic strategies are urgently needed. One of these strategies can be the use of neurokinin-1 receptor (NK-1R) antagonists (e.g., aprepitant), because the substance P (SP)/NK-1R system is involved in cancer progression, including AML. AML patients show an up-regulation of the NK-1R mRNA expression; human AML cell lines show immunoreactivity for both SP and the NK-1R (it is overexpressed: the truncated isoform is more expressed than the full-length form) and, via this receptor, SP and NK-1R antagonists (aprepitant, in a concentration-dependent manner) respectively exert a proliferative action or an antileukemic effect (apoptotic mechanisms are triggered by promoting oxidative stress via mitochondrial Ca++ overload). Aprepitant inhibits the formation of AML cell colonies and, in combination with chemotherapeutic drugs, is more effective in inducing cytotoxic effects and AML cell growth blockade. NK-1R antagonists also exert an antinociceptive effect in myeloid leukemia-induced bone pain. The antitumor effect of aprepitant is diminished when the NF-κB pathway is overactivated and the damage induced by aprepitant in cancer cells is higher than that exerted in non-cancer cells. Thus, the SP/NK-1R system is involved in AML, and aprepitant is a promising antitumor strategy against this hematological malignancy. In this review, the involvement of this system in solid and non-solid tumors (in particular in AML) is updated and the use of aprepitant as an anti-leukemic strategy for the treatment of AML is also mentioned (a dose of aprepitant (>20 mg/kg/day) for a period of time according to the response to treatment is suggested). Aprepitant is currently used in clinical practice as an anti-nausea medication.
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Bubak AN, Como CN, Blackmon AM, Frietze S, Mescher T, Jones D, Cohrs RJ, Paucek P, Baird NL, Nagel MA. Varicella Zoster Virus Induces Nuclear Translocation of the Neurokinin-1 Receptor, Promoting Lamellipodia Formation and Viral Spread in Spinal Astrocytes. J Infect Dis 2018; 218:1324-1335. [PMID: 29788447 PMCID: PMC6129113 DOI: 10.1093/infdis/jiy297] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 05/14/2018] [Indexed: 12/11/2022] Open
Abstract
Background Varicella zoster virus (VZV) can present as a myelopathy with spinal astrocyte infection. Recent studies support a role for the neurokinin-1 receptor (NK-1R) in virus infections, as well as for cytoskeletal alterations that may promote viral spread. Thus, we examined the role of NK-1R in VZV-infected primary human spinal astrocytes (HA-sps) to shed light on the pathogenesis of VZV myelopathy. Methods Mock- and VZV-infected HA-sps were examined for substance P (subP) production, NK-1R localization, morphological changes, and viral spread in the presence or absence of the NK-1R antagonists aprepitant and rolapitant. Results VZV infection of HA-sps induced nuclear localization of full-length and truncated NK-1R in the absence of the endogenous ligand, subP, and was associated with extensive lamellipodia formation and viral spread that was inhibited by NK-1R antagonists. Conclusions We have identified a novel, subP-independent, proviral function of nuclear NK-1R associated with lamellipodia formation and viral spread that is distinct from subP-induced NK-1R cell membrane/cytoplasmic localization without lamellipodia formation. These results suggest that binding of a putative viral ligand to NK-1R produces a dramatically different NK-1R downstream effect than binding of subP. Finally, the NK-1R antagonists aprepitant and rolapitant provide promising alternatives to nucleoside analogs in treating VZV infections, including myelopathy.
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Affiliation(s)
- Andrew N Bubak
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Christina N Como
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Anna M Blackmon
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Seth Frietze
- Department of Medical Laboratory and Radiation Sciences, University of Vermont, Burlington
| | - Teresa Mescher
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Dallas Jones
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Randall J Cohrs
- Department of Neurology, University of Colorado School of Medicine, Aurora
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora
| | - Petr Paucek
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Nicholas L Baird
- Department of Neurology, University of Colorado School of Medicine, Aurora
| | - Maria A Nagel
- Department of Neurology, University of Colorado School of Medicine, Aurora
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora
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11
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Niedermair T, Schirner S, Seebröker R, Straub RH, Grässel S. Substance P modulates bone remodeling properties of murine osteoblasts and osteoclasts. Sci Rep 2018; 8:9199. [PMID: 29907830 PMCID: PMC6003941 DOI: 10.1038/s41598-018-27432-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 06/04/2018] [Indexed: 11/09/2022] Open
Abstract
Clinical observations suggest neuronal control of bone remodeling. Sensory nerve fibers innervating bone, bone marrow and periosteum signal via neurotransmitters including substance P (SP). In previous studies we observed impaired biomechanical and structural bone parameters in tachykinin (Tac) 1-deficient mice lacking SP. Here, we aim to specify effects of SP on metabolic parameters of bone marrow macrophage (BMM)/osteoclast cultures and osteoblasts isolated from Tac1-deficient and wildtype (WT) mice. We demonstrated endogenous SP production and secretion in WT bone cells. Absence of SP reduced bone resorption rate, as we found reduced numbers of precursor cells (BMM) and multinucleated osteoclasts and measured reduced cathepsin K activity in Tac1-/- BMM/osteoclast cultures. However, this might partly be compensated by reduced apoptosis rate and increased fusion potential of Tac1-/- precursor cells to enlarged "super" osteoclasts. Contrarily, increased ALP enzyme activity and apoptosis rate during early osteoblast differentiation accelerated osteogenesis and cell death in the absence of SP together with reduced ALP activity of Tac1-/- osteoblasts during late osteogenic differentiation resulting in reduced bone formation at later stages. Therefore, we suggest that absence of SP presumably results in a slight reduction of bone resorption rate but concomitantly in a critical reduction of bone formation and mineralization rate.
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Affiliation(s)
- Tanja Niedermair
- Department of Orthopaedic Surgery, University of Regensburg, Regensburg, Germany.,Department of Orthopaedic Surgery, Experimental Orthopaedics, Centre for Medical Biotechnology, University of Regensburg, Regensburg, Germany
| | - Stephan Schirner
- Department of Orthopaedic Surgery, Experimental Orthopaedics, Centre for Medical Biotechnology, University of Regensburg, Regensburg, Germany
| | - Raphael Seebröker
- Department of Orthopaedic Surgery, Experimental Orthopaedics, Centre for Medical Biotechnology, University of Regensburg, Regensburg, Germany
| | - Rainer H Straub
- Department of Internal Medicine I, Experimental Rheumatology and Neuroendocrine-Immunology, University of Regensburg, Regensburg, Germany
| | - Susanne Grässel
- Department of Orthopaedic Surgery, University of Regensburg, Regensburg, Germany. .,Department of Orthopaedic Surgery, Experimental Orthopaedics, Centre for Medical Biotechnology, University of Regensburg, Regensburg, Germany.
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