1
|
Omer S, Pathak S, Mansour M, Nadar R, Bowen D, Dhanasekaran M, Pondugula SR, Boothe D. Effects of Cannabidiol, ∆9-Tetrahydrocannabinol, and WIN 55-212-22 on the Viability of Canine and Human Non-Hodgkin Lymphoma Cell Lines. Biomolecules 2024; 14:495. [PMID: 38672512 PMCID: PMC11047936 DOI: 10.3390/biom14040495] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 04/15/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
In our previous study, we demonstrated the impact of overexpression of CB1 and CB2 cannabinoid receptors and the inhibitory effect of endocannabinoids (2-arachidonoylglycerol (2-AG) and Anandamide (AEA)) on canine (Canis lupus familiaris) and human (Homo sapiens) non-Hodgkin lymphoma (NHL) cell lines' viability compared to cells treated with a vehicle. The purpose of this study was to demonstrate the anti-cancer effects of the phytocannabinoids, cannabidiol (CBD) and ∆9-tetrahydrocannabinol (THC), and the synthetic cannabinoid WIN 55-212-22 (WIN) in canine and human lymphoma cell lines and to compare their inhibitory effect to that of endocannabinoids. We used malignant canine B-cell lymphoma (BCL) (1771 and CLB-L1) and T-cell lymphoma (TCL) (CL-1) cell lines, and human BCL cell line (RAMOS). Our cell viability assay results demonstrated, compared to the controls, a biphasic effect (concentration range from 0.5 μM to 50 μM) with a significant reduction in cancer viability for both phytocannabinoids and the synthetic cannabinoid. However, the decrease in cell viability in the TCL CL-1 line was limited to CBD. The results of the biochemical analysis using the 1771 BCL cell line revealed a significant increase in markers of oxidative stress, inflammation, and apoptosis, and a decrease in markers of mitochondrial function in cells treated with the exogenous cannabinoids compared to the control. Based on the IC50 values, CBD was the most potent phytocannabinoid in reducing lymphoma cell viability in 1771, Ramos, and CL-1. Previously, we demonstrated the endocannabinoid AEA to be more potent than 2-AG. Our study suggests that future studies should use CBD and AEA for further cannabinoid testing as they might reduce tumor burden in malignant NHL of canines and humans.
Collapse
Affiliation(s)
- Saba Omer
- Department of Anatomy, Physiology & Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (S.O.); (M.M.); (S.R.P.)
| | - Suhrud Pathak
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA (R.N.); (D.B.); (M.D.)
| | - Mahmoud Mansour
- Department of Anatomy, Physiology & Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (S.O.); (M.M.); (S.R.P.)
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA (R.N.); (D.B.); (M.D.)
| | - Dylan Bowen
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA (R.N.); (D.B.); (M.D.)
| | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA (R.N.); (D.B.); (M.D.)
| | - Satyanarayana R. Pondugula
- Department of Anatomy, Physiology & Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (S.O.); (M.M.); (S.R.P.)
| | - Dawn Boothe
- Department of Anatomy, Physiology & Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (S.O.); (M.M.); (S.R.P.)
| |
Collapse
|
2
|
Desai D, Majrashi M, Pathak S, Almaghrabi M, Liu K, Pondugula SR, Tiwari AK, Babu RJ, Deruiter J, Dhanasekaran M. Evaluate the in vitro effect of anthracycline and alkylating cytophosphane chemotherapeutics on dopaminergic neurons. Cancer Rep (Hoboken) 2024; 7:e2074. [PMID: 38627904 PMCID: PMC11021631 DOI: 10.1002/cnr2.2074] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 03/28/2024] [Accepted: 04/03/2024] [Indexed: 04/19/2024] Open
Abstract
BACKGROUND Iatrogenesis is an inevitable global threat to healthcare that drastically increases morbidity and mortality. Cancer is a fatal pathological condition that affects people of different ages, sexes, and races around the world. In addition to the detrimental cancer pathology, one of the most common contraindications and challenges observed in cancer patients is severe adverse drug effects and hypersensitivity reactions induced by chemotherapy. Chemotherapy-induced cognitive neurotoxicity is clinically referred to as Chemotherapy-induced cognitive impairment (CICI), chemobrain, or chemofog. In addition to CICI, chemotherapy also causes neuropsychiatric issues, mental disorders, hyperarousal states, and movement disorders. A synergistic chemotherapy regimen of Doxorubicin (Anthracycline-DOX) and Cyclophosphamide (Alkylating Cytophosphane-CPS) is indicated for the management of various cancers (breast cancer, lymphoma, and leukemia). Nevertheless, there are limited research studies on Doxorubicin and Cyclophosphamide's pharmacodynamic and toxicological effects on dopaminergic neuronal function. AIM This study evaluated the dopaminergic neurotoxic effects of Doxorubicin and Cyclophosphamide. METHODS AND RESULTS Doxorubicin and Cyclophosphamide were incubated with dopaminergic (N27) neurons. Neuronal viability was assessed using an MTT assay. The effect of Doxorubicin and Cyclophosphamide on various prooxidants, antioxidants, mitochondrial Complex-I & IV activities, and BAX expression were evaluated by Spectroscopic, Fluorometric, and RT-PCR methods, respectively. Prism-V software (La Jolla, CA, USA) was used for statistical analysis. Chemotherapeutics dose-dependently inhibited the proliferation of the dopaminergic neurons. The dopaminergic neurotoxic mechanism of Doxorubicin and Cyclophosphamide was attributed to a significant increase in prooxidants, a decrease in antioxidants, and augmented apoptosis without affecting mitochondrial function. CONCLUSION This is one of the first reports that reveal Doxorubicin and Cyclophosphamide induce significant dopaminergic neurotoxicity. Thus, Chemotherapy-induced adverse drug reaction issues substantially persist during and after treatment and sometimes never be completely resolved clinically. Consequently, failure to adopt adequate patient care measures for cancer patients treated with certain chemotherapeutics might substantially raise the incidence of numerous movement disorders.
Collapse
Affiliation(s)
- Darshini Desai
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
| | - Mohammed Majrashi
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
- Department of PharmacologyFaculty of Medicine, University of JeddahJeddahSaudi Arabia
| | - Suhrud Pathak
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
| | - Mohammed Almaghrabi
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
- Department of Medicinal ChemistryFaculty of Pharmacy, Taibah UniversityAl‐MedinaSaudi Arabia
| | - Keyi Liu
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
| | - Satyanarayana R. Pondugula
- Department of AnatomyPhysiology and Pharmacology, College of Veterinary Medicine, Auburn UniversityAuburnAlabamaUSA
| | - Amit K. Tiwari
- Department of Pharmaceutical SciencesCollege of Pharmacy, University of Arkansas for Medical SciencesLittle RockArkansasUSA
| | - R. Jayachandra Babu
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
| | - Jack Deruiter
- Department of Drug Discovery and DevelopmentHarrison College of Pharmacy, Auburn UniversityAuburnAlabamaUSA
| | | |
Collapse
|
3
|
Akinsipe T, Mohamedelhassan R, Akinpelu A, Pondugula SR, Mistriotis P, Avila LA, Suryawanshi A. Cellular interactions in tumor microenvironment during breast cancer progression: new frontiers and implications for novel therapeutics. Front Immunol 2024; 15:1302587. [PMID: 38533507 PMCID: PMC10963559 DOI: 10.3389/fimmu.2024.1302587] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 02/16/2024] [Indexed: 03/28/2024] Open
Abstract
The breast cancer tumor microenvironment (TME) is dynamic, with various immune and non-immune cells interacting to regulate tumor progression and anti-tumor immunity. It is now evident that the cells within the TME significantly contribute to breast cancer progression and resistance to various conventional and newly developed anti-tumor therapies. Both immune and non-immune cells in the TME play critical roles in tumor onset, uncontrolled proliferation, metastasis, immune evasion, and resistance to anti-tumor therapies. Consequently, molecular and cellular components of breast TME have emerged as promising therapeutic targets for developing novel treatments. The breast TME primarily comprises cancer cells, stromal cells, vasculature, and infiltrating immune cells. Currently, numerous clinical trials targeting specific TME components of breast cancer are underway. However, the complexity of the TME and its impact on the evasion of anti-tumor immunity necessitate further research to develop novel and improved breast cancer therapies. The multifaceted nature of breast TME cells arises from their phenotypic and functional plasticity, which endows them with both pro and anti-tumor roles during tumor progression. In this review, we discuss current understanding and recent advances in the pro and anti-tumoral functions of TME cells and their implications for developing safe and effective therapies to control breast cancer progress.
Collapse
Affiliation(s)
- Tosin Akinsipe
- Department of Biological Sciences, College of Science and Mathematics, Auburn University, Auburn, AL, United States
| | - Rania Mohamedelhassan
- Department of Chemical Engineering, College of Engineering, Auburn University, Auburn, AL, United States
| | - Ayuba Akinpelu
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Satyanarayana R. Pondugula
- Department of Chemical Engineering, College of Engineering, Auburn University, Auburn, AL, United States
| | - Panagiotis Mistriotis
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - L. Adriana Avila
- Department of Biological Sciences, College of Science and Mathematics, Auburn University, Auburn, AL, United States
| | - Amol Suryawanshi
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| |
Collapse
|
4
|
Iwaki Y, Lindley SES, Bergman N, Smith BF, Pondugula SR. An evaluation of the combination effect of zoledronate and chemotherapeutic agents in canine osteosarcoma cells. Front Vet Sci 2024; 11:1327377. [PMID: 38420207 PMCID: PMC10900512 DOI: 10.3389/fvets.2024.1327377] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/17/2024] [Indexed: 03/02/2024] Open
Abstract
Introduction Osteosarcoma (OSA) is an aggressive form of bone cancer in both dogs and humans. The treatment options for metastatic (stage III) OSA are currently limited and the prognosis is poor. Zoledronate, a second generation amino-bisphosphonate, is commonly used for palliation of cancer induced bone pain. Zoledronate has also demonstrated anti-cancer properties and possibly enhances the cytotoxicity of doxorubicin in a canine histiocytosis cell line and human prostatic cancer cell line. The goal of this study was to evaluate the combination effect of zoledronate and various chemotherapeutic drugs in canine OSA cells. Methods Canine OSA cell line (D17), cells from two canine primary OSAs, and MDCK, a canine kidney cell line, were used to evaluate the therapeutic potential of these drugs. Carboplatin, doxorubicin, vinorelbine, toceranib, and isophosphoramide mustard (active metabolite of ifosfamide) were used as chemotherapeutic agents. First, cells were treated with either zoledronate or chemotherapy drug alone for 72 hours. Cell viability was assessed using CellTiter Glo and IC5, IC10, IC20, and IC50 were calculated. Second, cells were treated with a combination of zoledronate and each chemotherapeutic agent at their IC5, IC10, IC20, and IC50 concentrations. After 72 hours, cell viability was assessed by CellTiter Glo. Results and discussion Zoledronate, carboplatin, doxorubicin, vinorelbine, and isophosphoramide mustard showed concentration dependent decrease in cell viability. Toceranib showed decreased cell viability only at higher concentrations. When zoledronate was used in combination with chemotherapy drugs, while it showed potential synergistic effects with toceranib, potential antagonistic effects with vinorelbine and isophosphoramide mustard were observed. However, the results differed by cell line and thus, further evaluation is warranted to understand the exact mechanism of action.
Collapse
Affiliation(s)
- Yoshimi Iwaki
- Department of Clinical Science, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO, United States
| | - Stephanie E S Lindley
- Department of Clinical Science, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Noelle Bergman
- Department of Clinical Science, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Bruce F Smith
- Scott Ritchey Research Center, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn, AL, United States
| |
Collapse
|
5
|
Liu K, Kadannagari S, Deruiter J, Pathak S, Abbott KL, Salamat JM, Pondugula SR, Akingbemi BT, Dhanasekaran M. Effects of developmental exposures to Bisphenol-A and Bisphenol-S on hepatocellular function in male Long-Evans rats. Life Sci 2023; 326:121752. [PMID: 37172818 DOI: 10.1016/j.lfs.2023.121752] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/26/2023] [Accepted: 04/30/2023] [Indexed: 05/15/2023]
Abstract
Bisphenol-S (BPS) is a current substitute for Bisphenol-A (BPA) in various commercial products (paper, plastics, protective can-coatings, etc.) used by all age groups globally. The current literature indicates that a drastic surge in pro-oxidants, pro-apoptotic, and pro-inflammatory biomarkers in combination with diminished mitochondrial activity can potentially decrease hepatic function leading to morbidity and mortality. Consequently, there are increasing public health concerns that substantial Bisphenol-mediated effects may impact hepatocellular functions, particularly in newborns exposed to BPA and BPS postnatally. However, the acute postnatal impact of BPA and BPS and the molecular mechanisms affecting hepatocellular functions are unknown. Therefore, the current study investigated the acute postnatal effect of BPA and BPS on the biomarkers of hepatocellular functions, including oxidative stress, inflammation, apoptosis, and mitochondrial activity in male Long-Evans rats. BPA and BPS (5 and 20 microgram/Liter (μg/L) of drinking water) were administered to 21-day-old male rats for 14 days. BPS had no significant effect on apoptosis, inflammation, and mitochondrial function but significantly reduced the reactive oxygen species (51-60 %, **p < 0.01) and nitrite content (36 %, *p < 0.05), exhibiting hepatoprotective effects. As expected, based on the current scientific literature, BPA induced significant hepatoxicity, as seen by significant glutathione depletion (50 %, *p < 0.05). The in-silico analysis indicated that BPS is effectively absorbed in the gastrointestinal tract without crossing the blood-brain barrier (whereas BPA crosses the blood-brain barrier) and is not a substrate of p-Glycoprotein and Cytochrome P450 enzymes. Thus, the current in-silico and in vivo findings revealed that acute postnatal exposure to BPS had no significant hepatotoxicity.
Collapse
Affiliation(s)
- Keyi Liu
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, AL, USA
| | - Surekha Kadannagari
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, AL, USA
| | - Jack Deruiter
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, AL, USA
| | - Suhrud Pathak
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, AL, USA
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Julia M Salamat
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Benson T Akingbemi
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | | |
Collapse
|
6
|
Ahmed IA, Hafiz S, van Ginkel S, Pondugula SR, Abdelhaffez AS, Sayyed HG, El-Aziz EAA, Mansour MM. Augmentation of Docetaxel-Induced Cytotoxicity in Human PC-3 Androgen-Independent Prostate Cancer Cells by Combination With Four Natural Apoptosis-Inducing Anticancer Compounds. Nat Prod Commun 2023; 18:10.1177/1934578x231175323. [PMID: 37292146 PMCID: PMC10249917 DOI: 10.1177/1934578x231175323] [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] [Indexed: 06/10/2023] Open
Abstract
Docetaxel (DTX) is the treatment of choice for metastatic castration-resistant prostate cancer. However, developing drug resistance is a significant challenge for achieving effective therapy. This study evaluated the anticancer and synergistic effects on DTX of four natural compounds (calebin A, 3'-hydroxypterostilbene, hispolon, and tetrahydrocurcumin) using PC-3 androgen-resistant human prostate cancer cells. We utilized the CellTiter-Glo® luminescent cell viability assay and human PC-3 androgen-independent prostate cancer cells to determine the antiproliferative effects of the four compounds alone and combined with DTX. Cytotoxicity to normal human prostate epithelial cells was tested in parallel using normal immortalized human prostate epithelial cells (RWPE-1). We used cell imaging and quantitative caspase-3 activity to determine whether these compounds induce apoptosis. We also measured the capacity of each drug to inhibit TNF-α-induced NF-kB using a colorimetric assay. Our results showed that all four natural compounds significantly augmented the toxicity of DTX to androgen-resistant PC-3 prostate cancer cells at IC50. Interestingly, when used alone, each of the four compounds had a higher cytotoxic activity to PC-3 than DTX. Mechanistically, these compounds induced apoptosis, which we confirmed by cell imaging and caspase-3 colorimetric assays. Further, when used either alone or combined with DTX, the four test compounds inhibited TNF-α-induced NF-kB production. More significantly, the cytotoxic effects on normal immortalized human prostate epithelial cells were minimal and non-significant, suggesting prostate cancer-specific effects. In conclusion, the combination of DTX with the four test compounds could effectively enhance the anti-prostate cancer activity of DTX. This combination has the added value of reducing the DTX effective concentration. We surmise that calebin A, 3'-hydroxypterostilbene, hispolon, and tetrahydrocurcumin were all excellent drug candidates that produced significant antiproliferative activity when used alone and synergistically enhanced the anticancer effect of DTX. Further in vivo studies using animal models of prostate cancer are needed to confirm our in vitro findings.
Collapse
Affiliation(s)
- Inass A Ahmed
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
- Faculty of Veterinary Medicine, Assiut University, Egypt
| | - Saly Hafiz
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Sabrina van Ginkel
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | | | - Hayam G Sayyed
- Department of Physiology, Faculty of Medicine, Assiut University, Egypt
| | | | - Mahmoud M Mansour
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| |
Collapse
|
7
|
Abbott K, Salamat JM, Flannery PC, Chaudhury CS, Chandran A, Vishveshwara S, Mani S, Huang J, Tiwari AK, Pondugula SR. Gefitinib Inhibits Rifampicin-Induced CYP3A4 Gene Expression in Human Hepatocytes. ACS Omega 2022; 7:34034-34044. [PMID: 36188260 PMCID: PMC9520547 DOI: 10.1021/acsomega.2c03270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
During multidrug combination chemotherapy, activation of the nuclear receptor and the transcription factor human pregnane xenobiotic receptor (hPXR) has been shown to play a role in the development of chemoresistance. Mechanistically, this could occur due to the cancer drug activation of hPXR and the subsequent upregulation of hPXR target genes such as the drug metabolism enzyme, cytochrome P450 3A4 (CYP3A4). In the context of hPXR-mediated drug resistance, hPXR antagonists would be useful adjuncts to PXR-activating chemotherapy. However, there are currently no clinically approved hPXR antagonists in the market. Gefitinib (GEF), a tyrosine kinase inhibitor used for the treatment of advanced non-small-cell lung cancer and effectively used in combinational chemotherapy treatments, is a promising candidate owing to its hPXR ligand-like features. We, therefore, investigated whether GEF would act as an hPXR antagonist when combined with a known hPXR agonist, rifampicin (RIF). At therapeutically relevant concentrations, GEF successfully inhibited the RIF-induced upregulation of endogenous CYP3A4 gene expression in human primary hepatocytes and human hepatocells. Additionally, GEF inhibited the RIF induction of hPXR-mediated CYP3A4 promoter activity in HepG2 human liver carcinoma cells. The computational modeling of molecular docking predicted that GEF could bind to multiple sites on hPXR including the ligand-binding pocket, allowing for potential as a direct antagonist as well as an allosteric inhibitor. Indeed, GEF bound to the ligand-binding domain of the hPXR in cell-free assays, suggesting that GEF directly interacts with the hPXR. Taken together, our results suggest that GEF, at its clinically relevant therapeutic concentration, can antagonize the hPXR agonist-induced CYP3A4 gene expression in human hepatocytes. Thus, GEF could be a potential candidate for use in combinational chemotherapies to combat hPXR agonist-induced chemoresistance. Further studies are warranted to determine whether GEF has sufficient hPXR inhibitor abilities to overcome the hPXR agonist-induced chemoresistance.
Collapse
Affiliation(s)
- Kodye
L. Abbott
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn
University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
- Salk
Institute for Biological Studies, La Jolla, California 92037, United States
| | - Julia M. Salamat
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn
University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| | - Patrick C. Flannery
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn
University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
- Salk
Institute for Biological Studies, La Jolla, California 92037, United States
| | - Chloe S. Chaudhury
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn
University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| | - Aneesh Chandran
- Department
of Biotechnology and Microbiology, Kannur
University, Kannur, Kerala 670661, India
| | | | - Sridhar Mani
- Albert Einstein
Cancer Center, Albert Einstein College of
Medicine, New York 10461, United States
| | - Jianfeng Huang
- Salk
Institute for Biological Studies, La Jolla, California 92037, United States
| | - Amit K. Tiwari
- Center
of Medical Bio-Allied Health Sciences Research, Ajman University, Ajman 306, United Arab Emirates
- Department
of Pharmacology and Experimental Therapeutics, University of Toledo, Toledo, Ohio 43606, United States
- Department
of Cell and Cancer Biology, University of
Toledo, Toledo, Ohio 43614, United
States
| | - Satyanarayana R. Pondugula
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn
University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| |
Collapse
|
8
|
Zheng HS, Daniel JG, Salamat JM, Mackay L, Foradori CD, Kemppainen RJ, Pondugula SR, Tao YX, Huang CCJ. Early transcriptomic response of mouse adrenal gland and Y-1 cells to dexamethasone. Endocr Connect 2022; 11:EC-22-0064. [PMID: 35904237 PMCID: PMC9346337 DOI: 10.1530/ec-22-0064] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 12/05/2022]
Abstract
Glucocorticoids have short- and long-term effects on adrenal gland function and development. RNA sequencing (RNA-seq) was performed to identify early transcriptomic responses to the synthetic glucocorticoid, dexamethasone (Dex), in vitro and in vivo. In total, 1711 genes were differentially expressed in the adrenal glands of the 1-h Dex-treated mice. Among them, only 113 were also considered differentially expressed genes (DEGs) in murine adrenocortical Y-1 cells treated with Dex for 1 h. Gene ontology analysis showed that the upregulated DEGs in the adrenal gland of the 1-h Dex-treated mice were highly associated with the development of neuronal cells, suggesting the adrenal medulla had a rapid response to Dex. Interestingly, only 4.3% of Dex-responsive genes in the Y-1 cell line under Dex treatment for 1 h were differentially expressed under Dex treatment for 24 h. The heatmaps revealed that most early responsive DEGs in Y-1 cells during 1 h of treatment exhibited a transient response. The expression of these genes under treatment for 24 h returned to basal levels similar to that during control treatment. In summary, this research compared the rapid transcriptomic effects of Dex stimulation in vivo and in vitro. Notably, adrenocortical Y-1 cells had a transient early response to Dex treatment. Furthermore, the DEGs had a minimal overlap in the 1-h Dex-treated group in vivo and in vitro.
Collapse
Affiliation(s)
- Huifei Sophia Zheng
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Jeffrey G Daniel
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Julia M Salamat
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Laci Mackay
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Chad D Foradori
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Robert J Kemppainen
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Ya-Xiong Tao
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | - Chen-Che Jeff Huang
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
- Correspondence should be addressed to C-C J Huang:
| |
Collapse
|
9
|
Salamat J, Abbott KL, Flannery PC, Ledbetter EL, Pondugula SR. Interplay between the Cannabinoid System and microRNAs in Cancer. ACS Omega 2022; 7:9995-10000. [PMID: 35382335 PMCID: PMC8973111 DOI: 10.1021/acsomega.2c00635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/02/2022] [Indexed: 05/29/2023]
Abstract
Cancer patients often use cannabinoids for alleviating symptoms induced by cancer pathogenesis and cancer treatment. This use of cannabinoids can have unexpected effects in cancer patients depending on the cancer type, resulting in either beneficial (e.g., anticancer) or adverse (e.g., oncogenic) effects. While cannabinoids can enhance the growth and progression of some cancers, they can also suppress the growth and progression of other cancers. However, the underlying mechanisms of such differential effects are poorly understood. miRNAs have been shown to be involved in driving the hallmarks of cancer, affecting cancer growth and progression as well as cancer therapy response. Although the understanding of the effects of cannabinoids and miRNAs as they relate to cancer continues to improve, the interplay between cannabinoid system and miRNAs in cancer pathogenesis and cancer treatment response is poorly understood. Investigation of such interactions between the cannabinoid system and miRNAs could provide novel insights into the underlying mechanisms of the differential effects of cannabinoids in cancer and can help predict and improve the prognosis of cancer patients.
Collapse
Affiliation(s)
- Julia
M. Salamat
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
| | - Kodye L. Abbott
- Salk
Institute for Biological Studies, La Jolla, California 92037, United States
| | - Patrick C. Flannery
- Rocky
Vista University College of Osteopathic Medicine, Parker, Colorado 80134, United States
| | - Elizabeth L. Ledbetter
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
| | - Satyanarayana R. Pondugula
- Department
of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
| |
Collapse
|
10
|
Pondugula SR, Harshan A, Ramesh S, Govindarajulu M, Almaghrabi M, Majrashi M, Abbott KL, Nadar R, Alturki M, Salamat JM, Smith F, Majeed M, Nagabhushanam K, Moore T, Ren J, Dhanasekaran M. Cardioprotective Effects of Oroxylum indicum Extract Against Doxorubicin and Cyclophosphamide-Induced Cardiotoxicity. Cardiovasc Toxicol 2022; 22:67-77. [PMID: 34623620 DOI: 10.1007/s12012-021-09701-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/28/2021] [Indexed: 11/26/2022]
Abstract
Administration of Chemotherapeutics, especially doxorubicin (DOX) and cyclophosphamide (CPS), is commonly associated with adverse effects such as myelosuppression and cardiotoxicity. At this time, few approved therapeutic options are currently available for the management of chemotherapy-associated cardiotoxicity. Thus, identification of novel therapeutics with potent cardioprotective properties and minimal adverse effects are pertinent in treating Doxorubicin and Cyclophosphamide-induced cardiotoxicity. Oroxylum indicum extract (OIE, Sabroxy®) is a natural product known to possess several beneficial biological functions including antioxidant, anti-inflammatory and cytoprotective effects. We therefore set to investigate the cardioprotective effects of OIE against Doxorubicin and Cyclophosphamide-induced cardiotoxicity and explore the potential cardioprotective mechanisms involved. Adult male mice were treated with DOX and CPS in combination, OIE alone, or a combination of OIE and DOX & CPS. Swimming test was performed to assess cardiac function. Markers of oxidative stress were assessed by levels of reactive oxygen species (ROS), nitrite, hydrogen peroxide, catalase, and glutathione content. The activity of interleukin converting enzyme and cyclooxygenase was determined as markers of inflammation. Mitochondrial function was assessed by measuring Complex-I activity. Apoptosis was assessed by Caspase-3 and protease activity. Mice treated with DOX and CPS exhibited reduced swim rate, increased oxidative stress, increased inflammation, and apoptosis in the heart tissue. These cardiotoxic effects were significantly reduced by co-administration of OIE. Furthermore, computational molecular docking studies revealed potential binding of DOX and CPS to tyrosine hydroxylase which validated our in vivo findings regarding the inhibition of tyrosine hydroxylase activity. Our current findings indicated that OIE counteracts Doxorubicin and Cyclophosphamide-induced cardiotoxicity-through inhibition of ROS-mediated apoptosis and by blocking the effect on tyrosine hydroxylase. Taken together, our findings suggested that OIE possesses cardioprotective effects to counteract potentially fatal cardiac complications associated with chemotherapy treatment.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, 36849, USA.
| | - Aisha Harshan
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Sindhu Ramesh
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Manoj Govindarajulu
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Mohammed Almaghrabi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
- Department of Medicinal Chemistry, College of Pharmacy, Taibah University, Medina, Saudi Arabia
| | - Mohammed Majrashi
- Department of Pharmacology, Faculty of Medicine, University of Jeddah, Jeddah, 23881, Saudi Arabia
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, 36849, USA
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Mansour Alturki
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Julia M Salamat
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, 36849, USA
| | - Forrest Smith
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Muhammed Majeed
- Sabinsa Corporation, 20 Lake Drive, East Windsor, NJ, 08520, USA
| | | | - Timothy Moore
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA
| | - Jun Ren
- Department of Cardiology, Zhongshan Hospital Fudan University, Shanghai, 200032, China
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98195, USA
| | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA.
| |
Collapse
|
11
|
Pondugula SR, Salamat JM, Abbott KL, Flannery PC, Majrashi M, Almaghrabi M, Govindarajulu M, Ramesh S, Sandey M, Onteru SK, Huang CCJ, Iwaki Y, Gill K, Narayanan N, McElroy E, Desai D, Nadar R, Moore T, Dhanasekaran M. A clinically relevant combination treatment with doxorubicin and cyclophosphamide does not induce hepatotoxicity in C57BL/6J mice. Liver Res 2021; 5:239-242. [PMID: 34900377 PMCID: PMC8663913 DOI: 10.1016/j.livres.2021.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND AND AIM Chronic exposure to chemotherapeutics can lead to severe adverse events including hepatotoxicity. A combination chemotherapy regimen of doxorubicin (DOX) and cyclophosphamide (CPS) is employed in treatment of several cancers such as leukemia, lymphoma, and breast cancer. It is not well understood whether a combination therapy of DOX and CPS can induce hepatotoxicity. We therefore sought to determine whether co-administration of DOX and CPS at their clinically relevant doses and frequency results in hepatotoxicity. METHODS Male C57BL/6J mice received one intraperitoneal injection of saline or DOX-2mg /kg and CPS-50mg/kg once a week for 4 weeks. After the treatment period, liver histology and various serum biomarkers of hepatotoxicity were assessed. RESULTS Co-treatment of DOX and CPS did not alter the serum levels of alanine aminotransferase (ALT), alkaline phosphatase (ALP), bilirubin, albumin, globulin, or total protein. Similarly, co-administration of DOX and CPS did not result in a noticeable change in liver histology. However, it was notable that the concomitant treatment with DOX and CPS resulted in a significant increase in serum levels of aspartate aminotransferase (AST). Elevated serum AST levels were also associated with increased serum creatinine kinase (CK) levels, suggesting that the elevated serum AST levels are likely due to muscle injury following the co-administration of DOX and CPS. CONCLUSION Taken together, our results, for the first time, suggest that co-administration of DOX and CPS, at their clinically relevant doses and frequency does not induce a significant hepatotoxicity in the mice.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA,Corresponding Authors: Satyanarayana R. Pondugula, DVM, PhD, Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, Phone: 334-844-8505, Fax: 334-844-4542, , Muralikrishnan Dhanasekaran, M.Pharm., PG. DPM & IR, Ph.D, Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, , Phone: 334-844-8327
| | - Julia M Salamat
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Patrick C Flannery
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Mohammed Majrashi
- Department of Pharmacology, Faculty of Medicine, University of Jeddah, Jeddah, Saudi Arabia,Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Mohammed Almaghrabi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Manoj Govindarajulu
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Sindhu Ramesh
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Maninder Sandey
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, AL 36849, USA
| | - Suneel K Onteru
- Animal Biochemistry Division, National Dairy Research Institute, ICAR-NDRI, Karnal, Haryana 132001, India
| | - Chen-Che J Huang
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Yoshimi Iwaki
- Department of Clinical Science, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Kristina Gill
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Natasha Narayanan
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Edwin McElroy
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Darshini Desai
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Timothy Moore
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA,Corresponding Authors: Satyanarayana R. Pondugula, DVM, PhD, Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, Phone: 334-844-8505, Fax: 334-844-4542, , Muralikrishnan Dhanasekaran, M.Pharm., PG. DPM & IR, Ph.D, Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, , Phone: 334-844-8327
| |
Collapse
|
12
|
Jeminiwa BO, Knight RC, Abbot KL, Pondugula SR, Akingbemi BT. Gonadal sex steroid hormone secretion after exposure of male rats to estrogenic chemicals and their combinations. Mol Cell Endocrinol 2021; 533:111332. [PMID: 34038751 PMCID: PMC9310441 DOI: 10.1016/j.mce.2021.111332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 05/17/2021] [Accepted: 05/19/2021] [Indexed: 11/21/2022]
Abstract
Environmental chemicals can interfere with the endocrine axis hence they are classified as endocrine disrupting chemicals (EDCs). Bisphenol S (BPS) is used in the manufacture of consumer products because of its superior thermal stability and is thought to be a safe replacement chemical for its analog bisphenol A (BPA). However, the safety profile of these compounds alone or in the presence of other EDCs is yet to be fully investigated. Also, the estrogenic chemical 17α-ethinyl estradiol (EE2) and a constituent of female oral contraceptives for women, is present in water supplies. To simulate concurrent exposure of the population to chemical mixtures, we investigated the effects of BPA, BPS, EE2, and their combinations on sex steroid secretion in the growing male rat gonad. Prepubertal and pubertal male rats at 21 and 35 days of age were provided test chemicals in drinking water (parts per billion) for 14 days. At termination of exposure, some individual chemical effects were modified by exposure to chemical combinations. Single chemical exposures markedly decreased androgen secretion but their combination (e.g., BPA + BPS + EE2) caused the opposite effect, i.e., increased Leydig cell T secretion. Also, the test chemicals acting alone or in combination increased testicular and Leydig cell 17β-estradiol (E2) secretion. Chemical-induced changes in T and E2 secretion were associated with altered testicular expression of the cholesterol side-chain cleavage (Cyp11a1) and 17β-hydroxysteroid dehydrogenase (Hsd17β) enzyme protein. Additional studies are warranted to understand the mechanisms by which single and chemical combinations impact function of testicular cells and disrupt their paracrine regulation.
Collapse
Affiliation(s)
- B O Jeminiwa
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - R C Knight
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - K L Abbot
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - S R Pondugula
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - B T Akingbemi
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA.
| |
Collapse
|
13
|
Pondugula SR, Majrashi M, Almaghrabi M, Ramesh S, Abbott KL, Govindarajulu M, Gill K, Fahoury E, Narayanan N, Desai D, Ren J, Nadar R, McElroy T, Moore T, Majeed M, Kalyanam N, Dhanasekaran M. Oroxylum Indicum ameliorates chemotherapy induced cognitive impairment. PLoS One 2021; 16:e0252522. [PMID: 34081735 PMCID: PMC8174701 DOI: 10.1371/journal.pone.0252522] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 05/13/2021] [Indexed: 12/02/2022] Open
Abstract
While chemotherapy is the most effective therapeutic approach for treating a variety of cancer patients, commonly used chemotherapeutic agents, often induce several adverse effects. Escalating evidence indicates that chemotherapeutics, particularly doxorubicin (DOX) and cyclophosphamide (CPS), induce cognitive impairment associated with central nervous system toxicity. This study was performed to determine neuroprotective effects of Oroxylum indicum extract (OIE) in regard to preventing chemotherapy induced cognitive impairment (CICI) occurring after 4 cycles of DOX (2mg/kg) and CPS (50mg/kg) combination chemotherapy in male C57BL/6J mice. OIE significantly prevented the chemotherapy impaired short-term cognitive performance, exploratory behavior associated with cognitive performance, cognitive performance, and spatial learning and memory in the Y-maze, Open-Field, Novel Object Recognition, and Morris Water Maze tests, respectively. These data suggest that OIE protects from the CICI. OIE decreased the reactive oxygen species and lipid peroxide generated by the chemotherapy treatment in the brain, while also blocking the chemotherapy-induced glutathione depletion. These results establish that OIE exhibits potent antioxidant activity in chemotherapy treated mice. Notably, OIE significantly increased the Complex-I and Complex-IV activities in the brain, indicating that OIE enhances mitochondrial function in the brain. In silico analysis of the major active chemical constituents (Oroxylin A, Baicalein and Chrysin) of OIE indicated that OIE has a favorable absorption, distribution, metabolism and excretion (ADME) profile. Taken together, our results are consistent with the conclusion that OIE prevents CICI by counteracting oxidative stress and perhaps by improving mitochondrial function.
Collapse
Affiliation(s)
- Satyanarayana R. Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, United States of America
- * E-mail: (MD); (SRP)
| | - Mohammed Majrashi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
- Department of Pharmacology, Faculty of Medicine, University of Jeddah, Jeddah, Saudi Arabia
| | - Mohammed Almaghrabi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Sindhu Ramesh
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Kodye L. Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, United States of America
| | - Manoj Govindarajulu
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Kristina Gill
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, United States of America
| | - Eddie Fahoury
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Natasha Narayanan
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, United States of America
| | - Darshini Desai
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Jun Ren
- School of Pharmacy, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Trey McElroy
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, United States of America
| | - Timothy Moore
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
| | - Muhammed Majeed
- Sabinsa Corporation, East Windsor, New Jersey, United States of America
| | | | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, United States of America
- * E-mail: (MD); (SRP)
| |
Collapse
|
14
|
Pondugula SR, Salamat JM, Abbott KL, Flannery PC, Majrashi M, Almaghrabi M, Govindarajulu M, Ramesh S, Onteru SK, Sandey M, Huang CC, Gill K, Narayanan N, McElroy E, Desai D, Nadar R, Moore T, Nagabhushanam K, Majeed M, Dhanasekaran M. Oroxylum indicum extract, at a physiologically relevant dosage, does not induce hepatotoxicity in C57BL/6J mice. Nat Prod Commun 2021; 16. [PMID: 34306298 DOI: 10.1177/1934578x211016966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/16/2022] Open
Abstract
Background Botanical supplements have been proven to provide beneficial health effects. However, they can induce unintended adverse events such as hepatotoxicity. Oroxylum indicum extract (OIE, Sabroxy®) has several health benefits including anti-inflammatory, anti-arthritic, antifungal, antibacterial, and neuroprotective effects. It is currently unknown whether OIE has the potential to induce hepatotoxicity. Purpose In the current study, we sought to determine whether OIE can induce hepatotoxicity in C57BL/6J mouse model. Methods The male mice were fed powdered rodent food (control group) or powdered rodent food mixed with OIE (Sabroxy®, 500mg/kg) daily for 4 weeks. Following the treatment, we assessed liver histology and serum levels of biomarkers commonly associated with liver damage, including alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP). Results No significant alterations were observed in liver histology, and serum levels of ALT, AST, ALP, bilirubin, albumin, globulin and total protein in the OIE fed mice compared to the control mice. Conclusion Taken together, our results suggest that OIE, when fed at its physiologically relevant dosage, does not induce hepatotoxicity in C57BL/6J mice.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Julia M Salamat
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Patrick C Flannery
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Mohammed Majrashi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Mohammed Almaghrabi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Manoj Govindarajulu
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Sindhu Ramesh
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Suneel K Onteru
- Animal Biochemistry Division, National Dairy Research Institute, ICAR-NDRI, Karnal, Haryana 132001, India
| | - Maninder Sandey
- Department of Pathobiology, College of Veterinary Medicine, Auburn Univeristy, AL 36849, USA
| | - Chen-Che Huang
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Kristina Gill
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Natasha Narayanan
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Edwin McElroy
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | - Darshini Desai
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Timothy Moore
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | | | | | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| |
Collapse
|
15
|
Salamat JM, Abbott KL, Flannery PC, Pondugula SR. Dysregulation of Endobiotic Homeostasis Mechanisms: Novel Insights into Adverse Pharmacokinetic Interactions between Illicit Substances and Clinical Drugs. ACS Chem Neurosci 2020; 11:4021-4023. [PMID: 33232117 DOI: 10.1021/acschemneuro.0c00726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 12/23/2022] Open
Abstract
Many patients with a variety of medical conditions take illicit substances concomitantly with clinical drugs. This concomitant usage can lead to life-threatening adverse events. Despite the evidence that these adverse events can be caused by pharmacokinetic interactions, the underlying mechanisms are poorly understood. Investigation of mechanisms involved in dysregulation of endobiotic homeostasis during the concomitant usage of illicit substances with clinical drugs could provide novel insights into pharmacokinetic mechanisms of adverse interactions between illicit substances and clinical drugs.
Collapse
Affiliation(s)
- Julia M. Salamat
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| | - Kodye L. Abbott
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
- Salk Institute for Biological Studies, La Jolla, California 92037, United States
| | - Patrick C. Flannery
- Salk Institute for Biological Studies, La Jolla, California 92037, United States
- Rocky Vista University College of Osteopathic Medicine, Parker, Colorado 80134, United States
| | - Satyanarayana R. Pondugula
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| |
Collapse
|
16
|
Flannery PC, Abbott KL, Pondugula SR. Correlation of PPM1A Downregulation with CYP3A4 Repression in the Tumor Liver Tissue of Hepatocellular Carcinoma Patients. Eur J Drug Metab Pharmacokinet 2020; 45:297-304. [PMID: 31792727 DOI: 10.1007/s13318-019-00595-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND OBJECTIVE In many patients with hepatocellular carcinoma (HCC), cytochrome P450 3A4 (CYP3A4) expression has been reported to be significantly reduced in the tumor liver tissue. Moreover, this CYP3A4 repression is associated with decreased CYP3A4-mediated drug metabolism in the tumor liver tissue. However, the underlying mechanisms of CYP3A4 repression are not fully understood. We have previously shown that Mg2+/Mn2+-dependent phosphatase 1A (PPM1A) positively regulates human pregnane X receptor (hPXR)-mediated CYP3A4 expression in a PPM1A expression-dependent manner. We sought to determine whether PPM1A expression is downregulated and whether PPM1A downregulation is correlated with CYP3A4 repression in the tumor liver tissue of HCC patients. METHODS Quantitative RT-PCR and western blot analyses were performed to study mRNA and protein expression, respectively. Cell-based reporter gene assays were conducted to examine the hPXR transactivation of CYP3A4 promoter activity. RESULTS Arginase-1 and glypican-3 gene expression studies confirmed that the tumor samples used in our study originate from HCC livers but not non-hepatocellular tumors. mRNA and protein expression of PPM1A and CYP3A4 was found to be significantly repressed in the tumor liver tissues compared to the matched non-tumor liver tissues. In the reporter gene assays, elevated PPM1A levels counteracted the inhibition of hPXR-mediated CYP3A4 promoter activity by signaling pathways that are upregulated in HCC, suggesting that decreased PPM1A levels in HCC could not fully counteract the hPXR-inhibiting signaling pathways. CONCLUSIONS Together, these results are consistent with the conclusion that PPM1A downregulation in the tumor liver tissue of HCC patients correlates with CYP3A4 repression. Downregulation of PPM1A levels in the tumor liver tissue may contribute to reduced hPXR-mediated CYP3A4 expression, and provide a novel mechanism of CYP3A4 repression in the tumor liver tissue of HCC patients.
Collapse
Affiliation(s)
- Patrick C Flannery
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, 109 Greene Hall, Auburn, AL, 36849, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, 36849, USA
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, 109 Greene Hall, Auburn, AL, 36849, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, 36849, USA
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, 109 Greene Hall, Auburn, AL, 36849, USA. .,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, 36849, USA.
| |
Collapse
|
17
|
Velloso Alvarez A, Boone LH, Pondugula SR, Caldwell F, Wooldridge AA. Effects of Autologous Conditioned Serum, Autologous Protein Solution, and Triamcinolone on Inflammatory and Catabolic Gene Expression in Equine Cartilage and Synovial Explants Treated With IL-1β in Co-culture. Front Vet Sci 2020; 7:323. [PMID: 32671108 PMCID: PMC7332692 DOI: 10.3389/fvets.2020.00323] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 03/10/2020] [Accepted: 05/11/2020] [Indexed: 01/13/2023] Open
Abstract
Autologous conditioned serum (ACS) and autologous protein solution (APS) are newer therapeutic options for osteoarthritis (OA). Co-culture of cartilage and synovium stimulated with IL-1β produces a similar physiologic response to tissues from naturally-ocurring OA. The study objective was to investigate the effects of ACS, APS, and triamcinolone (TA) on inflammatory and catabolic gene expression of inflamed joint tissues in co-culture. Blood was collected and processed for ACS and APS from six horses. Cartilage and synovial explants were harvested from the stifle, placed in co-culture, and treated as: (1) unstimulated control (2) stimulated control (3) ACS at 25% v/v (4) ACS at 50% v/v (5) APS at 25% v/v (6) APS at 50% v/v, (7) TA (10−6 M). Treatment groups 2–7 were stimulated with IL-1β (10 ng/ml). Cultures were maintained for 96 hours, and then both media and explants were harvested for measurement of gene expression and protein. IL-1β stimulation significantly increased IL-1β (p = 0.029), IL-8 (p = 0.011) and MMP-3 (p = 0.043) expression in synovium and IL-1β (p = 0.003) and TNF-α (p = 0.001) expression in cartilage. Treatment with 50% ACS and APS v/v downregulated IL-1β expression in cartilage more than TA treatment (p = 0.001 and p = 0.0004) and APS downregulated MMP-1 expression in synovial membrane (p = 0.025). Treatment with ACS and APS caused a trend in upregulation of IL-10 expression in synovium and type II collagen and aggrecan expression in cartilage. PGE2 media concentrations were significantly reduced following treatment with APS (13.7-fold decrease, p = 0.0001) and ACS (4.13-fold decrease, p = 0.024); while TA did not reduce PGE2 significantly (2.3-fold decreased p = 0.406). As disease-modifying therapies, ACS and APS modified the cellular response from synovial membrane and articular cartilage. ACS and APS may offer an improved strategy to improve clinical signs of horses with naturally occurring OA, compared to TA treatment.
Collapse
Affiliation(s)
- Ana Velloso Alvarez
- Department of Clinical Sciences, Auburn University, Auburn, AL, United States
| | - Lindsey H Boone
- Department of Clinical Sciences, Auburn University, Auburn, AL, United States
| | | | - Fred Caldwell
- Department of Clinical Sciences, Auburn University, Auburn, AL, United States
| | - Anne A Wooldridge
- Department of Clinical Sciences, Auburn University, Auburn, AL, United States
| |
Collapse
|
18
|
Abbott KL, Gill KS, Flannery PC, Boothe DM, Dhanasekaran M, Pondugula SR. Nothing Ventured, Nothing Gained: Regulations Cripple Potentially Life-Saving Research of Illicit Substances. ACS Chem Neurosci 2020; 11:1382-1384. [PMID: 32395981 DOI: 10.1021/acschemneuro.0c00241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 12/21/2022] Open
Abstract
Modern day research, in an attempt to determine the potential therapeutic and adverse effects of illicit substances, is a growing field, but one that faces many regulatory challenges. Due to the potential abuse of illicit substances such as Cannabis, 3,4-methylenedioxymethamphetamine (MDMA), lysergic acid diethylamide (LSD) and psilocybin, regulations have been conceived with the intent of preventing harm and addiction. However, these regulations have also become a major barrier for the scientific community as they suffocate attempts of the scientists to acquire illicit substances for research purposes. Therefore, it is imperative to modify the current regulations of drug scheduling, leading to a reclassification of illicit substances that would allow for extensive testing in research settings. This reclassification effort could advance the potentially life-saving research of illicit substances.
Collapse
Affiliation(s)
- Kodye L. Abbott
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| | - Kristina S. Gill
- University of Massachusetts Memorial Medical Center, Worcester, Massachusetts 01655, United States
| | - Patrick C. Flannery
- Rocky Vista University College of Osteopathic Medicine, Parker, Colorado 80134, United States
| | - Dawn M. Boothe
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| | - Muralikrishnan Dhanasekaran
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
- Department of Drug Discovery and Development, Auburn University, Auburn Alabama 36849, United States
| | - Satyanarayana R. Pondugula
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, Alabama 36849, United States
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, Alabama 36849, United States
| |
Collapse
|
19
|
Pondugula SR, Majrashi M, Almaghrabi M, Abbott K, Govindarajulu M, Ramesh S, Gill K, Fahoury E, Narayanan N, Desai D, Nadar R, McElroy E, Moore T, Dhanasekaran M. Predictable hematological markers associated with cognitive decline in valid rodent models of cognitive impairment. Toxicol Mech Methods 2020; 30:454-461. [PMID: 32329394 DOI: 10.1080/15376516.2020.1760984] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 01/21/2023]
Abstract
Endogenous (hyperglycemia) and exogenous (therapeutic, prophylactic, street drugs) factors can considerably contribute to cognitive impairment (CI). Currently, there are few invasive and/or noninvasive markers that correlate with CI and those that do exist require expensive or invasive techniques to predict and accurately measure the cognitive decline. Therefore, we sought to determine hematological markers as predictors of CI in two different chemically induced valid rodent models of CI (streptozotocin induced hyperglycemic model and chemotherapy [doxorubicin/cyclophosphamide] treated rodent model). Hematological markers were analyzed in the above rodent models of CI CI and compared to their respective control groups. There was a significant increase in creatinine kinase, lactate dehydrogenase and aspartate aminotransferase (AST) in the chemotherapy group. Blood urea nitrogen (BUN), alkaline phosphatase (ALP), bilirubin, creatinine and glucose levels were significantly increased in the streptozotocin group. Interestingly, triglycerides were significantly elevated in both the streptozotocin and chemotherapy groups. Previous studies with human subjects have shown a potential link between the increase in triglyceride levels and CI. Likewise, our data indicate a notable correlation with an increase in triglycerides to cognitive impairment in the rodent models. This suggests elevated levels of triglycerides could prove to be a potential noninvasive hematological marker for the increased risk of CI. Further studies are warranted to determine the causal relationship between elevated triglyceride levels and CI.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Mohammed Majrashi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Mohammed Almaghrabi
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Kodye Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Manoj Govindarajulu
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Sindhu Ramesh
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Kristina Gill
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Eddie Fahoury
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Natasha Narayanan
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Darshini Desai
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Rishi Nadar
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Edwin McElroy
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Timothy Moore
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Muralikrishnan Dhanasekaran
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| |
Collapse
|
20
|
Pondugula SR, Majrashi M, Almaghrabi M, Abbott KL, Govindarajulu M, Ramesh S, Gill K, Fahoury E, Narayanan N, Desai D, Nadar R, McElroy E, Moore T, Nagabhushanam K, Majeed M, Dhanasekaran M. Oroxylum indicum
extract prevents chemotherapy‐induced cognitive impairment in mice. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.07348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Abbott KL, Salamat JM, Flannery PC, Chaudhury CS, Narayanan N, Chandran A, Vishveshwara S, Mani S, Pondugula SR. Gefitinib, at Its Clinically Relevant Concentrations, Inhibits Rifampicin‐Induced CYP3A4 Gene Expression in Human Hepatocytes. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.07255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
22
|
Abbott KL, Flannery PC, Gill KS, Boothe DM, Dhanasekaran M, Mani S, Pondugula SR. Adverse pharmacokinetic interactions between illicit substances and clinical drugs. Drug Metab Rev 2019; 52:44-65. [PMID: 31826670 DOI: 10.1080/03602532.2019.1697283] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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: 12/15/2022]
Abstract
Adverse pharmacokinetic interactions between illicit substances and clinical drugs are of a significant health concern. Illicit substances are taken by healthy individuals as well as by patients with medical conditions such as mental illnesses, acquired immunodeficiency syndrome, diabetes mellitus and cancer. Many individuals that use illicit substances simultaneously take clinical drugs meant for targeted treatment. This concomitant usage can lead to life-threatening pharmacokinetic interactions between illicit substances and clinical drugs. Optimal levels and activity of drug-metabolizing enzymes and drug-transporters are crucial for metabolism and disposition of illicit substances as well as clinical drugs. However, both illicit substances and clinical drugs can induce changes in the expression and/or activity of drug-metabolizing enzymes and drug-transporters. Consequently, with concomitant usage, illicit substances can adversely influence the therapeutic outcome of coadministered clinical drugs. Likewise, clinical drugs can adversely affect the response of coadministered illicit substances. While the interactions between illicit substances and clinical drugs pose a tremendous health and financial burden, they lack a similar level of attention as drug-drug, food-drug, supplement-drug, herb-drug, disease-drug, or other substance-drug interactions such as alcohol-drug and tobacco-drug interactions. This review highlights the clinical pharmacokinetic interactions between clinical drugs and commonly used illicit substances such as cannabis, cocaine and 3, 4-Methylenedioxymethamphetamine (MDMA). Rigorous efforts are warranted to further understand the underlying mechanisms responsible for these clinical pharmacokinetic interactions. It is also critical to extend the awareness of the life-threatening adverse interactions to both health care professionals and patients.
Collapse
Affiliation(s)
- Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, USA
| | - Patrick C Flannery
- College of Osteopathic Medicine, Rocky Vista University, Parker, CO, USA
| | - Kristina S Gill
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, USA
| | - Dawn M Boothe
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, USA
| | - Muralikrishnan Dhanasekaran
- Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, USA.,Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, AL, USA
| | - Sridhar Mani
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, USA
| |
Collapse
|
23
|
Zhang Y, Rants'o TA, Jung D, Lopez E, Abbott K, Pondugula SR, McLendon L, Qian J, Hansen RA, Calderón AI. Screening for CYP3A4 inhibition and induction coupled to parallel artificial membrane permeability assay (PAMPA) for prediction of botanical-drug interactions: The case of açaí and maca. Phytomedicine 2019; 59:152915. [PMID: 30981185 DOI: 10.1016/j.phymed.2019.152915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 02/27/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND The consumption of botanical dietary supplements (BDS) is a common practice among the US population. However, the potential for botanical-drug interactions exists, and their mechanisms have not been thoroughly studied. CYP3A4 is an important enzyme that contributes to the metabolism of about 60% of clinically used drugs. PURPOSE To investigate the potential for botanical-drug interactions of Lepidium meyenii Walpers (maca) root and Euterpe oleracea Mart. (açaí) berries, two commonly used BDS, when co-administered with CYP3A4-metabolized drugs. METHODS In an attempt to decrease the general discrepancy between in vivo and in vitro studies, the absorption profiles, particularly for passive diffusion, of plant extracts were investigated. Specifically, the parallel artificial membrane permeability assay (PAMPA) model was utilized to simulate intestinal filtration of passively diffused constituents of açaí and maca extracts. These were subsequently screened for in vitro liver CYP3A4 inhibition and induction. In the inhibition assay, midazolam was used as the probe substrate on genotyped human liver microsomes (CYP3A5 null), and the production of its 1'-substituted metabolite when co-cultured with extract treatments was monitored. In the induction assay, extract treatments were applied to human primary hepatocytes, and quantitative PCR analysis was performed to determine CYP3A4 mRNA expression. RESULTS Passively diffused constituents of the methanol açaí extract (IC50 of 28.03 µg/µl) demonstrated the highest inhibition potential, and, at 1.5 µg/µl, induced significant changes in CYP3A4 gene expression. The composition of this extract was further investigated using the chemometric tool Mass Profiler Professional (MPP) on liquid chromatography-mass spectroscopy (LC-MS) data. Subsequently, five compounds of interest characterized by high abundance or high permeability were extracted for further study. This included efforts in effective passive permeability determination and structural elucidation by tandem mass spectrometry (MS/MS). CONCLUSION The passively absorbable portion of a methanol açaí extract exhibited inhibition and induction effects on CYP3A4 suggesting the potential to produce botanical-drug interactions.
Collapse
Affiliation(s)
- Yilue Zhang
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Thankhoe A Rants'o
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA; Pharmacology Division, Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Da Jung
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA; College of Science and Mathematics, Auburn University, Auburn, AL 36849, USA
| | - Elizabeth Lopez
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA; College of Science and Mathematics, Auburn University, Auburn, AL 36849, USA
| | - Kodye Abbott
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA
| | | | - Lane McLendon
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA; College of Science and Mathematics, Auburn University, Auburn, AL 36849, USA
| | - Jingjing Qian
- Department of Health Outcomes Research and Policy, Auburn University, Auburn, AL 36849, USA
| | - Richard A Hansen
- Department of Health Outcomes Research and Policy, Auburn University, Auburn, AL 36849, USA
| | - Angela I Calderón
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL 36849, USA.
| |
Collapse
|
24
|
Abbott KL, Chaudhury CS, Chandran A, Vishveshwara S, Dvorak Z, Jiskrova E, Poulikova K, Vyhlidalova B, Mani S, Pondugula SR. Belinostat, at Its Clinically Relevant Concentrations, Inhibits Rifampicin-Induced CYP3A4 and MDR1 Gene Expression. Mol Pharmacol 2019; 95:324-334. [PMID: 30622215 PMCID: PMC6362450 DOI: 10.1124/mol.118.114587] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 01/03/2019] [Indexed: 01/26/2023] Open
Abstract
Activation of human pregnane X receptor (hPXR) has been associated with induction of chemoresistance. It has been proposed that such chemoresistance via cytochrome P450/drug transporters can be reversed with the use of antagonists that specifically abrogate agonist-mediated hPXR activation. Unfortunately, proposed antagonists lack the specificity and appropriate pharmacological characteristics that allow these features to be active in the clinic. We propose that, ideally, an hPXR antagonist would be a cancer drug itself that is part of a "cancer drug cocktail" and effective as an hPXR antagonist at therapeutic concentrations. Belinostat (BEL), a histone deacetylase inhibitor approved for the treatment of relapsed/refractory peripheral T-cell lymphoma, and often used in combination with chemotherapy, is an attractive candidate based on its hPXR ligand-like features. We sought to determine whether these features of BEL might allow it to behave as an antagonist in combination chemotherapy regimens that include hPXR activators. BEL represses agonist-activated hPXR target gene expression at its therapeutic concentrations in human primary hepatocytes and LS174T human colon cancer cells. BEL repressed rifampicin-induced gene expression of CYP3A4 and multidrug resistance protein 1, as well as their respective protein activities. BEL decreased rifampicin-induced resistance to SN-38, the active metabolite of irinotecan, in LS174T cells. This finding indicates that BEL could suppress hPXR agonist-induced chemoresistance. BEL attenuated the agonist-induced steroid receptor coactivator-1 interaction with hPXR, and, together with molecular docking studies, the study suggests that BEL directly interacts with multiple sites on hPXR. Taken together, our results suggest that BEL, at its clinically relevant therapeutic concentration, can antagonize hPXR agonist-induced gene expression and chemoresistance.
Collapse
Affiliation(s)
- Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Chloe S Chaudhury
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Aneesh Chandran
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Saraswathi Vishveshwara
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Zdenek Dvorak
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Eva Jiskrova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Karolina Poulikova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Barbora Vyhlidalova
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Sridhar Mani
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology (K.L.A., C.S.C., S.R.P.) and Auburn University Research Initiative in Cancer (K.L.A., C.S.C., S.R.P.), Auburn University, Auburn, Alabama; Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India (A.C., S.V.); Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Czech Republic (Z.D., E.J., K.P., B.V.); and Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, New York (S.M.)
| |
Collapse
|
25
|
Mansour M, van Ginkel S, Dennis JC, Mason B, Elhussin I, Abbott K, Pondugula SR, Samuel T, Morrison E. The Combination of Omega-3 Stearidonic Acid and Docetaxel Enhances Cell Death over Docetaxel Alone in Human Prostate Cancer Cells. J Cancer 2018; 9:4536-4546. [PMID: 30519360 PMCID: PMC6277657 DOI: 10.7150/jca.26681] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 04/14/2018] [Accepted: 08/26/2018] [Indexed: 12/31/2022] Open
Abstract
Background: Docetaxel (DOC), or Taxotere, is an anthracycline antibiotic used to treat multiple types of cancer. It is a first-line chemotherapy treatment for patients with metastasized, hormone-resistant prostate cancer (PCa) or for patients with high-risk, localized PCa that could benefit from early chemotherapy treatment. Previously, we showed that stearidonic acid (SDA), an omega-3 fatty acid, enhances the cytotoxicity of doxorubicin (DOX) in human PCa cells. This observation suggests that PCa therapies using SDA and chemotherapeutic drugs in combination offer attractive possibilities for developing treatments that ameliorate toxic side effects of some commonly used chemotherapy drugs. Objectives: We used androgen-resistant PC3 and DU 145 cells derived from human prostate cancer to quantify the effects of combined SDA and DOC on proliferation/viability and on the production of pro-apoptotic caspases 9 and 3. We also compared the effects of SDA with those of BAY, a pharmacological inhibitor of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-ĸB), in androgen-sensitive LNCaP cells. Finally, we qualitatively and quantitatively assessed the drug combination on androgen receptor (AR) and peroxisome proliferator-activated receptor gamma (PPARγ) expression in LNCaP and PC3 cells, respectively. Methods: The half maximal inhibitory concentration (IC50) and combination indices of SDA and DOC in PC3 and DU 145 cells were determined using the MTT cell viability assay. To quantify the effects of SDA and BAY on NF-ĸB activity, we used luciferase reporter assays in LNCaP cells that were stably transduced with lentiviral vectors carrying NF-ĸB response element sequence upstream of the luciferase gene sequence. AR and PPARγ expression were assessed by western blotting and immunocytochemistry. We considered caspase 9 and 3 cleavage to be apoptosis markers and determined the drug combination effect on the extent of that cleavage by western blot analysis. Results: The cytotoxic effects of DOC were synergistically enhanced by SDA when the two were added to DU145 and PC3 cell cultures. Combination index (CI) analyses based on the Chou-Talalay method and mass action law showed synergistic interaction with CI <1. SDA suppressed TNFα-induced NF-κB activity similarly to BAY. The SDA/DOC combination down regulated testosterone (T)-induced AR and troglitazone-induced PPARγ protein expression when compared to using the drugs singly. Similarly, the SDA/DOC combination induced caspase 9 and 3 production and cleavage suggesting apoptosis induction. Like our DOX studies, this work provides proof-of-concept for using SDA and DOC in combination to reduce the dose, and therefore the toxicity, of DOC and possibly increasing the survival benefit in DOC clinical translation studies.
Collapse
Affiliation(s)
- Mahmoud Mansour
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Sabrina van Ginkel
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - John C Dennis
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Brandon Mason
- VCA Alameda East Veterinary Hospital, 9770 East Alameda Ave, Denver, CO 80247
| | - Isra Elhussin
- Department of Pathobiology, College of Veterinary Medicine, Tuskegee University, Tuskegee, AL
| | - Kodye Abbott
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Temesgen Samuel
- Department of Pathobiology, College of Veterinary Medicine, Tuskegee University, Tuskegee, AL
| | - Edward Morrison
- Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| |
Collapse
|
26
|
Abbott KL, Chaudhury CS, Narayanan N, Pondugula SR. Belinostat Inhibits Rifampicin Induced CYP3A4 and MDR1 Gene Expression. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.694.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kodye L. Abbott
- Anatomy, Physiology and PharmacologyAuburn UniversityAuburnAL
| | | | | | | |
Collapse
|
27
|
Abstract
Pregnane X receptor (PXR) is an adopted orphan nuclear receptor that is activated by a wide-range of endobiotics and xenobiotics, including chemotherapy drugs. PXR plays a major role in the metabolism and clearance of xenobiotics and endobiotics in liver and intestine via induction of drug-metabolizing enzymes and drug-transporting proteins. However, PXR is expressed in several cancer tissues and the accumulating evidence strongly points to the differential role of PXR in cancer growth and progression as well as in chemotherapy outcome. In cancer cells, besides regulating the gene expression of enzymes and proteins involved in drug metabolism and transport, PXR also regulates other genes involved in proliferation, metastasis, apoptosis, anti-apoptosis, inflammation, and oxidative stress. In this review, we focus on the differential role of PXR in a variety of cancers, including prostate, breast, ovarian, endometrial, and colon. We also discuss the future directions to further understand the differential role of PXR in cancer, and conclude with the need to identify novel selective PXR modulators to target PXR in PXR-expressing cancers.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - Petr Pavek
- Faculty of Pharmacy in Hradec Králové, Charles University in Prague, Heyrovského 1203, Hradec Králové 500 05, Czech Republic, European Union
| | - Sridhar Mani
- Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, NY 10461, USA
| |
Collapse
|
28
|
Wang YM, Chai SC, Lin W, Chai X, Elias A, Wu J, Ong SS, Pondugula SR, Beard JA, Schuetz EG, Zeng S, Xie W, Chen T. Serine 350 of human pregnane X receptor is crucial for its heterodimerization with retinoid X receptor alpha and transactivation of target genes in vitro and in vivo. Biochem Pharmacol 2015; 96:357-68. [PMID: 26119819 DOI: 10.1016/j.bcp.2015.06.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [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: 05/15/2015] [Accepted: 06/16/2015] [Indexed: 12/21/2022]
Abstract
The human pregnane X receptor (hPXR), a member of the nuclear receptor superfamily, senses xenobiotics and controls the transcription of genes encoding drug-metabolizing enzymes and transporters. The regulation of hPXR's transcriptional activation of its target genes is important for xenobiotic detoxification and endobiotic metabolism, and hPXR dysregulation can cause various adverse drug effects. Studies have implicated the putative phosphorylation site serine 350 (Ser(350)) in regulating hPXR transcriptional activity, but the mechanism of regulation remains elusive. Here we investigated the transactivation of hPXR target genes in vitro and in vivo by hPXR with a phosphomimetic mutation at Ser(350) (hPXR(S350D)). The S350D phosphomimetic mutation reduced the endogenous expression of cytochrome P450 3A4 (an hPXR target gene) in HepG2 and LS180 cells. Biochemical assays and structural modeling revealed that Ser(350) of hPXR is crucial for formation of the hPXR-retinoid X receptor alpha (RXRα) heterodimer. The S350D mutation abrogated heterodimerization in a ligand-independent manner, impairing hPXR-mediated transactivation. Further, in a novel humanized transgenic mouse model expressing the hPXR(S350D) transgene, we demonstrated that the S350D mutation alone is sufficient to impair hPXR transcriptional activity in mouse liver. This transgenic mouse model provides a unique tool to investigate the regulation and function of hPXR, including its non-genomic function, in vivo. Our finding that phosphorylation regulates hPXR activity has implications for development of novel hPXR antagonists and for safety evaluation during drug development.
Collapse
Affiliation(s)
- Yue-Ming Wang
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Sergio C Chai
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Wenwei Lin
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Xiaojuan Chai
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Pharmaceutical Analysis and Drug Metabolism, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Ayesha Elias
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jing Wu
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Su Sien Ong
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Satyanarayana R Pondugula
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jordan A Beard
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Erin G Schuetz
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Su Zeng
- Department of Pharmaceutical Analysis and Drug Metabolism, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Wen Xie
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Taosheng Chen
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, TN 38163, USA.
| |
Collapse
|
29
|
Fadlalla K, Elgendy R, Gilbreath E, Pondugula SR, Yehualaeshet T, Mansour M, Serbessa T, Manne U, Samuel T. 3-(2-Bromoethyl)-indole inhibits the growth of cancer cells and NF-κB activation. Oncol Rep 2015; 34:495-503. [PMID: 26063116 PMCID: PMC4484612 DOI: 10.3892/or.2015.3970] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 03/20/2015] [Indexed: 12/20/2022] Open
Abstract
Indole-3-carbinol (I3C) and diindolylmethane (DIM), found in cruciferous vegetables, have chemopreventive and anticancer properties. In the present study, 14 substituted indoles were tested for activity against SW480 colon cancer cells. Among these, 3-(2-bromoethyl)-indole, named BEI-9, showed the greatest inhibition. The effects of BEI-9 on cancer cells were analyzed by MTS and CellTiter-Glo assays for effects on cell viability, by microscopy for phenotypic changes, by scratch wound assays for effects on migration, by flow cytometry for changes in the cell cycle, by immunoblotting for cyclin D and A to assess effects on cell cycle regulation, and by NF-κB reporter assays for effects on basal and drug-induced NF-κB activation. BEI-9 inhibited the growth of SW480 and HCT116 colon cancer cells at concentrations of 12.5 and 5 µM, respectively. BEI-9 also inhibited cell motility as determined with scratch wound assays, and reduced the levels of cyclin D1 and A. Furthermore, in reporter cells, BEI-9 (0.8 µM) inhibited basal and induced NF-κB activation and increased cell death when combined with the cytokine TNFα or the drug camptothecin (CPT), both of which activate NF-κB. Preliminary experiments to identify a safe dose range for immunodeficient mice showed that BEI-9, administered intraperitoneally, was tolerable at doses below 10 mg/kg. Thus, BEI-9 and other indole derivatives may be useful in chemoprevention or as chemosensitizers. Since NF-κB activation is implicated in carcinogenesis and in reducing sensitivity to anticancer drugs, BEI-9 should be investigated in combination with drugs such as CPT, which activate NF-κB.
Collapse
Affiliation(s)
- Khalda Fadlalla
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, Tuskegee, AL, USA
| | - Ramy Elgendy
- Department of Pharmacology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Ebony Gilbreath
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, Tuskegee, AL, USA
| | - Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Teshome Yehualaeshet
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, Tuskegee, AL, USA
| | - Mahmoud Mansour
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Tesfaye Serbessa
- Department of Natural Sciences, Elizabeth City State University, Elizabeth City, NC, USA
| | - Upender Manne
- Department of Pathology and Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Temesgen Samuel
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, Tuskegee, AL, USA
| |
Collapse
|
30
|
Pondugula SR, Ferniany G, Ashraf F, Abbott KL, Smith BF, Coleman ES, Mansour M, Bird RC, Smith AN, Karthikeyan C, Trivedi P, Tiwari AK. Stearidonic acid, a plant-based dietary fatty acid, enhances the chemosensitivity of canine lymphoid tumor cells. Biochem Biophys Res Commun 2015; 460:1002-7. [PMID: 25847597 DOI: 10.1016/j.bbrc.2015.03.141] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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: 03/22/2015] [Accepted: 03/24/2015] [Indexed: 01/26/2023]
Abstract
Lymphoma is the most common hematopoietic tumor in dogs and humans, with similar pathogenesis and therapeutic responses. Anticancer drugs like vincristine (VCR) and doxorubicin (DOX) are often used in treating lymphoma. However, the cure rate is generally poor due to chemoresistance. Here, we sought to determine whether stearidonic acid (SDA), a plant-based dietary fatty acid, sensitizes chemoresistant canine lymphoid-tumor cells. GL-1 B-cell lymphoid-tumor cells were found to be highly sensitive to the antitumor-activity of VCR and DOX, while OSW T-cell and 17-71 B-cell lymphoid-tumor cells were moderately and fully resistant, respectively. SDA, at its non-toxic concentrations, significantly promoted the antitumor action of VCR and DOX in both OSW and 17-71 cells. SDA-mediated chemosensitization was associated with SDA inhibition of P-glycoprotein (P-gp) function. This was confirmed in HEK293 cells stably expressing P-gp as well as by increased binding-affinity of SDA to P-gp in P-gp docking analysis. SDA at its chemosensitizing concentrations did not affect the viability of healthy dog peripheral blood mononuclear cells, suggesting that SDA is non-toxic to normal dog peripheral blood leucocytes at its chemosensitizing concentrations. Our study identifies a novel dietary fatty acid that may be used as a dietary supplement in combination with chemotherapy to promote the antitumor efficacy of the chemotherapy drugs in dogs and possibly in humans with chemoresistant lymphoma.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA.
| | - Glennie Ferniany
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA
| | - Farah Ashraf
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - Bruce F Smith
- Department of Pathobiology, Auburn University, Auburn, AL 36849, USA; Scott-Ritchey Research Center, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - Elaine S Coleman
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA
| | - Mahmoud Mansour
- Department of Anatomy, Physiology and Pharmacology, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - R Curtis Bird
- Department of Pathobiology, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - Annette N Smith
- Department of Clinical Sciences, Auburn University, Auburn, AL 36849, USA; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL 36849, USA
| | - Chandrabose Karthikeyan
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal, MP 462033, India
| | - Piyush Trivedi
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal, MP 462033, India
| | - Amit K Tiwari
- Department of Pharmacology and Experimental Therapeutics, The University of Toledo, Toledo, OH 43614, USA
| |
Collapse
|
31
|
Pondugula SR, Flannery PC, Apte U, Babu JR, Geetha T, Rege SD, Chen T, Abbott KL. Mg2+/Mn2+-dependent phosphatase 1A is involved in regulating pregnane X receptor-mediated cytochrome p450 3A4 gene expression. Drug Metab Dispos 2015; 43:385-91. [PMID: 25561723 PMCID: PMC11024896 DOI: 10.1124/dmd.114.062083] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 01/05/2015] [Indexed: 04/20/2024] Open
Abstract
Variations in the expression of human pregnane X receptor (hPXR)-mediated cytochrome p450 3A4 (CYP3A4) in liver can alter therapeutic response to a variety of drugs and may lead to potential adverse drug interactions. We sought to determine whether Mg(2+)/Mn(2+)-dependent phosphatase 1A (PPM1A) regulates hPXR-mediated CYP3A4 expression. PPM1A was found to be coimmunoprecipitated with hPXR. Genetic or pharmacologic activation of PPM1A led to a significant increase in hPXR transactivation of CYP3A4 promoter activity. In contrast, knockdown of endogenous PPM1A not only attenuated hPXR transactivation, but also increased proliferation of HepG2 human liver carcinoma cells, suggesting that PPM1A expression levels regulate hPXR, and that PPM1A expression is regulated in a proliferation-dependent manner. Indeed, PPM1A expression and hPXR transactivation were found to be significantly reduced in subconfluent HepG2 cells compared with confluent HepG2 cells, suggesting that both PPM1A expression and hPXR-mediated CYP3A4 expression may be downregulated in proliferating livers. Elevated PPM1A levels led to attenuation of hPXR inhibition by tumor necrosis factor-α and cyclin-dependent kinase-2, which are known to be upregulated and essential during liver regeneration. In mouse regenerating livers, similar to subconfluent HepG2 cells, expression of both PPM1A and the mouse PXR target gene cyp3a11 was found to be downregulated. Our results show that PPM1A can positively regulate PXR activity by counteracting PXR inhibitory signaling pathways that play a major role in liver regeneration. These results implicate a novel role for PPM1A in regulating hPXR-mediated CYP3A4 expression in hepatocytes and may explain a mechanism for CYP3A repression in regenerating livers.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Patrick C Flannery
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Udayan Apte
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Jeganathan Ramesh Babu
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Thangiah Geetha
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Shraddha D Rege
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Taosheng Chen
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| | - Kodye L Abbott
- Department of Anatomy, Physiology, and Pharmacology (S.R.P., P.C.F., K.L.A.) and Department of Nutrition, Dietetics, and Hospitality Management (J.R.B., S.D.R.), Auburn University, Auburn, Alabama; Department of Chemistry (T.G.), Auburn University at Montgomery, Montgomery, Alabama; Department of Chemical Biology and Therapeutics (T.C.), St. Jude Children's Research Hospital, Memphis, Tennessee; and Department of Pharmacology, Toxicology, and Therapeutics (U.A.), University of Kansas, Kansas City, Kansas
| |
Collapse
|
32
|
Pondugula SR, Flannery PC, Abbott KL, Coleman ES, Mani S, Samuel T, Xie W. Diindolylmethane, a naturally occurring compound, induces CYP3A4 and MDR1 gene expression by activating human PXR. Toxicol Lett 2014; 232:580-9. [PMID: 25542144 DOI: 10.1016/j.toxlet.2014.12.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [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: 08/11/2014] [Revised: 12/08/2014] [Accepted: 12/20/2014] [Indexed: 11/24/2022]
Abstract
Activation of human pregnane X receptor (hPXR)-regulated expression of cytochrome P450 3A4 (CYP3A4) and multidrug resistance protein 1 (MDR1) plays an important role in mediating adverse drug interactions. Given the common use of natural products as part of adjunct human health behavior, there is a growing concern about natural products for their potential to induce undesired drug interactions through the activation of hPXR-regulated CYP3A4 and MDR1. Here, we studied whether 3,3'-diindolylmethane (DIM), a natural health supplement, could induce hPXR-mediated regulation of CYP3A4 and MDR1 in human hepatocytes and intestinal cells. DIM, at its physiologically relevant concentrations, not only induced hPXR transactivation of CYP3A4 promoter activity but also induced gene expression of CYP3A4 and MDR1. DIM decreased intracellular accumulation of MDR1 substrate rhodamine 123, suggesting that DIM induces the functional expression of MDR1. Pharmacologic inhibition or genetic knockdown of hPXR resulted in attenuation of DIM induced CYP3A4 and MDR1 gene expression, suggesting that DIM induces CYP3A4 and MDR1 in an hPXR-dependent manner. Together, these results support our conclusion that DIM induces hPXR-regulated CYP3A4 and MDR1 gene expression. The inductive effects of DIM on CYP3A4 and MDR1 expression caution the use of DIM in conjunction with other medications metabolized and transported via CYP3A4 and MDR1, respectively.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, AL, United States; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, United States.
| | - Patrick C Flannery
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, AL, United States; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, United States
| | - Kodye L Abbott
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, AL, United States; Auburn University Research Initiative in Cancer, Auburn University, Auburn, AL, United States
| | - Elaine S Coleman
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, AL, United States
| | - Sridhar Mani
- Albert Einstein Cancer Center, Albert Einstein College of Medicine, New York, NY, United States
| | - Temesgen Samuel
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, AL, United States
| | - Wen Xie
- Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, United States
| |
Collapse
|
33
|
Pondugula SR, Kampalli SB, Wu T, De Lisle RC, Raveendran NN, Harbidge DG, Marcus DC. cAMP-stimulated Cl- secretion is increased by glucocorticoids and inhibited by bumetanide in semicircular canal duct epithelium. BMC Physiol 2013; 13:6. [PMID: 23537040 PMCID: PMC3622586 DOI: 10.1186/1472-6793-13-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 03/11/2013] [Indexed: 12/13/2022]
Abstract
Background The vestibular system controls the ion composition of its luminal fluid through several epithelial cell transport mechanisms under hormonal regulation. The semicircular canal duct (SCCD) epithelium has been shown to secrete Cl- under β2-adrenergic stimulation. In the current study, we sought to determine the ion transporters involved in Cl- secretion and whether secretion is regulated by PKA and glucocorticoids. Results Short circuit current (Isc) from rat SCCD epithelia demonstrated stimulation by forskolin (EC50: 0.8 μM), 8-Br-cAMP (EC50: 180 μM), 8-pCPT-cAMP (100 μM), IBMX (250 μM), and RO-20-1724 (100 μM). The PKA activator N6-BNZ-cAMP (0.1, 0.3 & 1 mM) also stimulated Isc. Partial inhibition of stimulated Isc individually by bumetanide (10 & 50 μM), and [(dihydroindenyl)oxy]alkanoic acid (DIOA, 100 μM) were additive and complete. Stimulated Isc was also partially inhibited by CFTRinh-172 (5 & 30 μM), flufenamic acid (5 μM) and diphenylamine-2,2′-dicarboxylic acid (DPC; 1 mM). Native canals of CFTR+/− mice showed a stimulation of Isc from isoproterenol and forskolin+IBMX but not in the presence of both bumetanide and DIOA, while canals from CFTR−/− mice had no responses. Nonetheless, CFTR−/− mice showed no difference from CFTR+/− mice in their ability to balance (rota-rod). Stimulated Isc was greater after chronic incubation (24 hr) with the glucocorticoids dexamethasone (0.1 & 0.3 μM), prednisolone (0.3, 1 & 3 μM), hydrocortisone (0.01, 0.1 & 1 μM), and corticosterone (0.1 & 1 μM) and mineralocorticoid aldosterone (1 μM). Steroid action was blocked by mifepristone but not by spironolactone, indicating all the steroids activated the glucocorticoid, but not mineralocorticoid, receptor. Expression of transcripts for CFTR; for KCC1, KCC3a, KCC3b and KCC4, but not KCC2; for NKCC1 but not NKCC2 and for WNK1 but only very low WNK4 was determined. Conclusions These results are consistent with a model of Cl- secretion whereby Cl- is taken up across the basolateral membrane by a Na+-K+-2Cl- cotransporter (NKCC) and potentially another transporter, is secreted across the apical membrane via a Cl- channel, likely CFTR, and demonstrate the regulation of Cl- secretion by protein kinase A and glucocorticoids.
Collapse
|
34
|
Yamazaki M, Wu T, Pondugula SR, Harbidge DG, Marcus DC. Sodium selectivity of semicircular canal duct epithelial cells. BMC Res Notes 2011; 4:355. [PMID: 21914199 PMCID: PMC3180474 DOI: 10.1186/1756-0500-4-355] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 09/13/2011] [Indexed: 11/16/2022] Open
Abstract
Background Sodium absorption by semicircular canal duct (SCCD) epithelial cells is thought to contribute to the homeostasis of the volume of vestibular endolymph. It was previously shown that the epithelial cells could absorb Na+ under control of a glucocorticoid hormone (dexamethasone) and the absorptive transepithelial current was blocked by amiloride. The most commonly-observed target of amiloride is the epithelial sodium channel (ENaC), comprised of the three subunits α-, β- and γ-ENaC. However, other cation channels have also been observed to be sensitive in a similar concentration range. The aim of this study was to determine whether SCCD epithelial cells absorb only Na+ or also K+ through an amiloride-sensitive pathway. Parasensory K+ absorption could contribute to regulation of the transduction current through hair cells, as found to occur via vestibular transitional cells [S. H. Kim and D. C. Marcus. Regulation of sodium transport in the inner ear. Hear.Res. doi:10.1016/j.heares.2011.05.003, 2011]. Results We determined the molecular and functional expression of candidate cation channels with gene array (GEO GSE6197), whole-cell patch clamp and transepithelial recordings in primary cultures of rat SCCD. α-, β- and γ-ENaC were all previously reported as present. The selectivity of the amiloride-sensitive transepithelial and cell membrane currents was observed in Ussing chamber and whole-cell patch clamp recordings. The cell membrane currents were carried by Na+ but not K+, but the Na+ selectivity disappeared when the cells were cultured on impermeable supports. Transepithelial currents across SCCD were also carried exclusively by Na+. Conclusions These results are consistent with the amiloride-sensitive absorptive flux of SCCD mediated by a highly Na+-selective channel, likely αβγ-ENaC. These epithelial cells therefore absorb only Na+ via the amiloride-sensitive pathway and do not provide a parasensory K+ efflux from the canals via this pathway. The results further provide caution to the culture of epithelial cells on impermeable surfaces.
Collapse
Affiliation(s)
- Muneharu Yamazaki
- Cellular Biophysics Laboratory, Department of Anatomy & Physiology, Kansas State University, Manhattan, KS 66506, USA.
| | | | | | | | | |
Collapse
|
35
|
Pondugula SR, Tong AA, Wu J, Cui J, Chen T. Protein phosphatase 2Cbetal regulates human pregnane X receptor-mediated CYP3A4 gene expression in HepG2 liver carcinoma cells. Drug Metab Dispos 2010; 38:1411-6. [PMID: 20538721 DOI: 10.1124/dmd.110.032128] [Citation(s) in RCA: 10] [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: 01/18/2023] Open
Abstract
The human pregnane X receptor (hPXR) regulates the expression of CYP3A4, which plays a vital role in hepatic drug metabolism and has considerably reduced expression levels in proliferating hepatocytes. We have recently shown that cyclin-dependent kinase 2 (CDK2) negatively regulates hPXR-mediated CYP3A4 gene expression. CDK2 can be dephosphorylated and inactivated by protein phosphatase type 2C beta isoform long (PP2Cbetal), a unique phosphatase that was originally cloned from human liver. In this study, we sought to determine whether PP2Cbetal is involved in regulating hPXR's transactivation activity and whether PP2Cbetal affects CDK2 regulation of this activity in HepG2 liver carcinoma cells. In transactivation assays, transiently coexpressed PP2Cbetal significantly enhanced the hPXR-mediated CYP3A4 promoter activity and decreased the inhibitory effect of CDK2 on hPXR transactivation activity. In addition, shRNA-mediated down-regulation of endogenous PP2Cbetal promoted cell proliferation, inhibited the interaction of hPXR with steroid receptor coactivator-1, and attenuated the hPXR transcriptional activity. The levels of PP2Cbetal did not affect hPXR expression. Our results show for the first time that PP2Cbetal is essential for hPXR activity and can positively regulate this activity by counteracting the inhibitory effect of CDK2. Our results implicate a novel and important role for PP2Cbetal in regulating hPXR activity and CYP3A4 expression by inhibiting or desensitizing signaling pathways that negatively regulate the function of pregnane X receptor in liver cells and are consistent with the notion that both the activity of hPXR and the expression of CYP3A4 are regulated in a cell cycle-dependent and cell proliferation-dependent manner.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | | | | | | | | |
Collapse
|
36
|
Pondugula SR, Raveendran NN, Marcus DC. Ion transport regulation by P2Y receptors, protein kinase C and phosphatidylinositol 3-kinase within the semicircular canal duct epithelium. BMC Res Notes 2010; 3:100. [PMID: 20398257 PMCID: PMC2862037 DOI: 10.1186/1756-0500-3-100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Accepted: 04/14/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The ionic composition of the luminal fluid in the vestibular labyrinth is maintained within tight limits by the many types of epithelial cells bounding the lumen. Regulatory mechanisms include systemic, paracrine and autocrine hormones along with their associated intracellular signal pathways. The epithelium lining the semicircular canal duct (SCCD) is a tissue that is known to absorb sodium and calcium and to secrete chloride. FINDINGS Transport function was assessed by measurements of short circuit current (Isc) and gene transcript expression was evaluated by microarray. Neither ATP nor UTP (100 microM) on the apical side of the epithelium had any effect on Isc. By contrast, basolateral ATP transiently increased Isc and transepithelial resistance dropped significantly after basolateral ATP and UTP. P2Y2 was the sole UTP-sensitive purinergic receptor expressed. Isc was reduced by 42%, 50% and 63% after knockdown of alpha-ENaC, stimulation of PKC and inhibition of PI3-K, while the latter two increased the transepithelial resistance. PKCdelta, PKCgamma and PI3-K were found to be expressed. CONCLUSIONS These observations demonstrate that ion transport by the SCCD is regulated by P2Y2 purinergic receptors on the basolateral membrane that may respond to systemic or local agonists, such as ATP and/or UTP. The sodium absorption from endolymph mediated by ENaC in SCCD is regulated by signal pathways that include the kinases PKC and PI3-K. These three newly-identified regulatory components may prove to be valuable drug targets in the control of pathologic vestibular conditions involving dysfunction of transport homeostasis in the ear, such as Meniere's disease.
Collapse
|
37
|
Abstract
BACKGROUND The expression of drug-metabolizing enzymes CYPs is controlled by pregnane X receptor (PXR), and, therefore, understanding how PXR modulates CYP expression is important to minimize adverse drug interactions, one type of preventable adverse drug reaction. OBJECTIVE We review the mechanisms of PXR-mediated repression of CYP expression. METHODS We discuss the clinical implications of CYP repression and the role of signal cross-talks, including protein-protein interactions and phosphorylation of PXR and coregulators, in inhibiting PXR and repressing CYP expression. RESULTS/CONCLUSION Kinases such as cyclin-dependent kinase 2, protein kinase A, PKC and 70 kDa form of ribosomal protein S6 kinase repress CYP expression by phosphorylating and inhibiting PXR. Growth factor signaling represses CYP expression by phosphorylating and inhibiting forkhead in rhabdomyosarcoma, a co-activator of PXR. During inflammation, NF-kappaB represses both PXR and CYP expression through protein-protein interactions with the PXR pathway.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- St. Jude Children's Research Hospital, Department of Chemical Biology and Therapeutics, 262 Danny Thomas Place, Mail Stop 1000, Memphis, TN 38105, USA
| | | | | |
Collapse
|
38
|
Pondugula SR, Brimer-Cline C, Wu J, Schuetz EG, Tyagi RK, Chen T. A phosphomimetic mutation at threonine-57 abolishes transactivation activity and alters nuclear localization pattern of human pregnane x receptor. Drug Metab Dispos 2009; 37:719-30. [PMID: 19171678 DOI: 10.1124/dmd.108.024695] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The pregnane X receptor (PXR) plays crucial roles in multiple physiological processes. However, the signaling mechanisms responsible are not well defined; it is most likely that multiple functions of PXR are modulated by its phosphorylation. Therefore, we sought to determine whether mutation at a highly conserved Thr(57) affects human PXR (hPXR) function. Site-directed mutagenesis was performed to generate phosphorylation-deficient (hPXR(T57A)) and phosphomimetic (hPXR(T57D)) mutants. Gene reporter, Western blotting, immunocytochemistry, mammalian two-hybrid, and electrophoretic mobility shift assays were used to study cytochrome P450 3A4 (CYP3A4) promoter activation, protein levels, localization, cofactor interaction, and CYP3A4 promoter binding of the hPXR mutants, respectively. hPXR(T57D), but not hPXR(T57A), lost its transcriptional activity. Neither mutation altered hPXR's protein levels and interaction with steroid receptor coactivator-1. hPXR and hPXR(T57A) exhibited a homogenous nuclear distribution, whereas hPXR(T57D) exhibited a distinctive punctate nuclear localization pattern similar to that of hPXR mutants with impaired function that colocalize with silencing mediator of retinoid and thyroid receptors (SMRT), although silencing of SMRT did not rescue the altered function of hPXR(T57D). However, hPXR(T57D), but not hPXR(T57A), impaired hPXR's ability to bind to the CYP3A4 promoter, consistent with the mutant's transactivation function. Furthermore, the 70-kDa form of ribosomal protein S6 kinase (p70 S6K) phosphorylated hPXR in vitro and inhibited its transcriptional activity, whereas hPXR(T57A) partially resisted the inhibitory effect of p70 S6K. Our studies identify a functionally significant phosphomimetic mutant (hPXR(T57D)) and show p70 S6K phosphorylation and regulation of hPXR transactivation to support the notion that phosphorylation plays important roles in regulating hPXR function.
Collapse
Affiliation(s)
- Satyanarayana R Pondugula
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 1000, Memphis, TN 38105, USA
| | | | | | | | | | | |
Collapse
|
39
|
Kim SH, Kim KX, Raveendran NN, Wu T, Pondugula SR, Marcus DC. Regulation of ENaC-mediated sodium transport by glucocorticoids in Reissner's membrane epithelium. Am J Physiol Cell Physiol 2009; 296:C544-57. [PMID: 19144862 DOI: 10.1152/ajpcell.00338.2008] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Reissner's membrane epithelium forms much of the barrier that produces and sustains the large ionic differences between cochlear endolymph and perilymph. We have reported that Reissner's membrane contributes to normal cochlear function by absorbing Na(+) from endolymph via amiloride-sensitive channels in gerbil inner ear. We used mouse Reissner's membrane to 1) identify candidate genes involved in the Na(+) transport pathway, 2) determine whether their level of expression was regulated by the synthetic glucocorticoid dexamethasone, and 3) obtain functional evidence for the physiological importance of these genes. Transcripts were present for alpha-, beta-, and gamma-subunits of epithelial Na(+) channel (ENaC); corticosteroid receptors GR (glucocorticoid receptor) and MR (mineralocorticoid receptor); GR agonist regulator 11beta-hydroxysteroid dehydrogenase (HSD) type 1 (11beta-HSD1); Na(+) transport control components SGK1, Nedd4-2, and WNKs; and K(+) channels and Na(+)-K(+)-ATPase. Expression of the MR agonist regulator 11beta-HSD2 was not detected. Dexamethasone upregulated transcripts for alpha- and beta-subunits of ENaC ( approximately 6- and approximately 3-fold), KCNK1 ( approximately 3-fold), 11beta-HSD1 ( approximately 2-fold), SGK1 ( approximately 2-fold), and WNK4 ( approximately 3-fold). Transepithelial currents from the apical to the basolateral side of Reissner's membrane were sensitive to amiloride (IC(50) approximately 0.7 muM) and benzamil (IC(50) approximately 0.1 muM), but not EIPA (IC(50) approximately 34 muM); amiloride-blocked transepithelial current was not immediately changed by forskolin/IBMX. Currents were reduced by ouabain, lowered bath Na(+) concentration (from 150 to 120 mM), and K(+) channel blockers (XE-991, Ba(2+), and acidification from pH 7.4 to 6.5). Dexamethasone-stimulated current and gene expression were reduced by mifepristone, but not spironolactone. These molecular, pharmacological, and functional observations are consistent with Na(+) absorption by mouse Reissner's membrane, which is mediated by apical ENaC and/or other amiloride-sensitive channels, basolateral Na(+)-K(+)-ATPase, and K(+)-permeable channels and is under the control of glucocorticoids. These results provide an understanding and a molecular definition of an important transport function of Reissner's membrane epithelium in the homeostasis of cochlear endolymph.
Collapse
Affiliation(s)
- Sung Huhn Kim
- Kansas State Univ., Anatomy & Physiology, 228 Coles Hall, Manhattan, KS 66506-5802, USA
| | | | | | | | | | | |
Collapse
|
40
|
Raveendran NN, Wu T, Pondugula SR, Marcus DC. Microarray Analysis of Ion Transport‐Related Genes in Reissner’s Membrane. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a345-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Tao Wu
- Anatomy & PhysiologyKansas State University228 Coles HallManhattanKS66506
| | | | - Daniel C. Marcus
- Anatomy & PhysiologyKansas State University228 Coles HallManhattanKS66506
| |
Collapse
|
41
|
Yamauchi D, Raveendran NN, Pondugula SR, Sanneman JD, Marcus DC. Epithelial calcium channel (TRPV5) regulates cochlear and vestibular calcium via vitamin D‐responsive pathway. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a800-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Daisuke Yamauchi
- Anatomy & PhysiologyKansas State University228 Coles HallManhattanKS66506
| | | | | | - Joel D. Sanneman
- Anatomy & PhysiologyKansas State University228 Coles HallManhattanKS66506
| | - Daniel C. Marcus
- Anatomy & PhysiologyKansas State University228 Coles HallManhattanKS66506
| |
Collapse
|
42
|
Pondugula SR, Raveendran NN, Ergonul Z, Deng Y, Chen J, Sanneman JD, Palmer LG, Marcus DC. Glucocorticoid regulation of genes in the amiloride-sensitive sodium transport pathway by semicircular canal duct epithelium of neonatal rat. Physiol Genomics 2006; 24:114-23. [PMID: 16263802 DOI: 10.1152/physiolgenomics.00006.2005] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The lumen of the inner ear has an unusually low concentration of endolymphatic Na+, which is important for transduction processes. We have recently shown that glucocorticoid receptors (GR) stimulate absorption of Na+by semicircular canal duct (SCCD) epithelia. In the present study, we sought to determine the presence of genes involved in the control of the amiloride-sensitive Na+transport pathway in rat SCCD epithelia and whether their level of expression was regulated by glucocorticoids using quantitative real-time RT-PCR. Transcripts were present for α-, β-, and γ-subunits of the epithelial sodium channel (ENaC); the α1-, α3-, β1-, and β3-isoforms of Na+-K+-ATPase; inwardly rectifying potassium channels [IC50of short circuit current ( Isc) for Ba2+: 210 μM] Kir2.1, Kir2.2, Kir2.3, Kir2.4, Kir3.1, Kir3.3, Kir4.1, Kir4.2, Kir5.1, and Kir7.1; sulfonyl urea receptor 1 (SUR1); GR; mineralocorticoid receptor (MR); 11β-hydroxysteroid dehydrogenase (11β-HSD) types 1 and 2; serum- and glucocorticoid-regulated kinase 1 (Sgk1); and neural precursor cell-expressed developmentally downregulated 4-2 (Nedd4-2). On the other hand, transcripts for the α4-subunit of Na+-K+-ATPase, Kir1.1, Kir3.2, Kir3.4, Kir6.1, Kir6.2, and SUR2 were found to be absent, and Iscwas not inhibited by glibenclamide. Dexamethasone (100 nM for 24 h) not only upregulated the transcript expression of α-ENaC (∼4-fold), β2-subunit (∼2-fold) and β3-subunit (∼8-fold) of Na+-K+-ATPase, Kir2.1 (∼5-fold), Kir2.2 (∼9-fold), Kir2.4 (∼3-fold), Kir3.1 (∼ 3- fold), Kir3.3 (∼2-fold), Kir4.2 (∼3-fold ), Kir7.1 (∼2-fold), Sgk1 (∼4-fold), and Nedd4-2 (∼2-fold) but also downregulated GR (∼3-fold) and 11β-HSD1 (∼2-fold). Expression of GR and 11β-HSD1 was higher than MR and 11β-HSD2 in the absence of dexamethasone. Dexamethasone altered transcript expression levels (α-ENaC and Sgk1) by activation of GR but not MR. Proteins were present for the α-, β-, and γ-subunits of ENaC and Sgk1, and expression of α- and γ-ENaC was upregulated by dexamethasone. These findings are consistent with the genomic stimulation by glucocorticoids of Na+absorption by SCCD and provide an understanding of the therapeutic action of glucocorticoids in the treatment of Meniere's disease.
Collapse
|
43
|
Yamauchi D, Raveendran NN, Pondugula SR, Kampalli SB, Sanneman JD, Harbidge DG, Marcus DC. Vitamin D upregulates expression of ECaC1 mRNA in semicircular canal. Biochem Biophys Res Commun 2005; 331:1353-7. [PMID: 15883024 DOI: 10.1016/j.bbrc.2005.04.053] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Indexed: 10/25/2022]
Abstract
The low luminal Ca2+ concentration of mammalian endolymph in the vestibular labyrinth is required for normal balance. We found transcripts in primary cultures of semicircular canal duct (SCCD) epithelial cells from neonatal rats representing a complete transport system for transepithelial absorption of Ca2+ that is comprised of the epithelial Ca2+ channels ECaC1 (CaT2, TRPV5) and ECaC2 (CaT1, TRPV6), calbindin (calbindin-D9k, calbindin-D28k), Na+/Ca2+ exchanger (NCX1, NCX2, and NCX3), and plasma membrane Ca2+-ATPase (PMCA1, PMCA3, and PMCA4) by RT-PCR. Further, vitamin D receptor was also expressed in SCCD and it was found by quantitative RT-PCR that incubation for 24 h with 1,25-dihydroxyvitamin D3 upregulated the expression of ECaC1, calbindin-D9k, and calbindin-D28k. These observations provide evidence for the first time of an ECaC-based Ca2+ transport system in SCCD that could maintain the low Ca2+ concentration in vestibular endolymph.
Collapse
Affiliation(s)
- Daisuke Yamauchi
- Cellular Biophysics Laboratory, Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
| | | | | | | | | | | | | |
Collapse
|
44
|
Pondugula SR, Sanneman JD, Wangemann P, Milhaud PG, Marcus DC. Glucocorticoids stimulate cation absorption by semicircular canal duct epithelium via epithelial sodium channel. Am J Physiol Renal Physiol 2004; 286:F1127-35. [PMID: 14996671 DOI: 10.1152/ajprenal.00387.2003] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The semicircular canal duct (SCCD) epithelium is a vestibular epithelial domain that was recently shown to actively contribute to endolymph homeostasis by Cl(-) secretion under control of beta(2)-adrenergic stimulation. By analogy to other Cl(-) secretory epithelia, we hypothesized that SCCD also provides an active absorptive pathway for Na(+) under corticosteroid control. Measurements of short-circuit current (I(sc)) demonstrated stimulation (7-24 h) by the glucocorticoids hydrocortisone (EC(50) 13 nM), corticosterone (33 nM), prednisolone (70 nM), and dexamethasone (13 nM) over physiologically and therapeutically relevant concentrations and its block by amiloride (IC(50) 470 nM) and benzamil (57 nM), inhibitors of the epithelial sodium channel (ENaC). I(sc) was also partially inhibited by basolateral ouabain and Ba(2+), indicating the participation of Na(+)-K(+)-ATPase and a K(+) channel in Na(+) transport. By contrast, aldosterone stimulated I(sc) only at unphysiologically high concentrations (EC(50) 102 nM). The action of all steroids was blocked by mifepristone (RU-486; K(d) approximately 0.3 nM) but not by spironolactone (K(d) approximately 0.7 microM). Expression of mRNA for the alpha-, beta-, and gamma-subunits of ENaC was demonstrated in the presence and absence of glucocorticoids. These findings are the first to identify SCCD in the vestibular labyrinth as a site of physiologically significant ENaC-mediated Na(+) absorption and osmotically coupled water flux. They further demonstrate regulation of Na(+) transport by natural and therapeutic glucocorticoids. The results provide for the first time an understanding of the therapeutic benefit of glucocorticoids in the treatment of Meniere's disease, a condition that is associated with increased luminal fluid volume.
Collapse
|
45
|
Milhaud PG, Pondugula SR, Lee JH, Herzog M, Lehouelleur J, Wangemann P, Sans A, Marcus DC. Chloride secretion by semicircular canal duct epithelium is stimulated via beta 2-adrenergic receptors. Am J Physiol Cell Physiol 2002; 283:C1752-60. [PMID: 12388054 DOI: 10.1152/ajpcell.00283.2002] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The ductal epithelium of the semicircular canal forms much of the boundary between the K+-rich luminal fluid and the Na+-rich abluminal fluid. We sought to determine whether the net ion flux producing the apical-to-basal short-circuit current (I(sc)) in primary cultures was due to anion secretion and/or cation absorption and under control of receptor agonists. Net fluxes of 22Na, 86Rb, and 36Cl demonstrated a basal-to-apical Cl- secretion that was stimulated by isoproterenol. Isoproterenol and norepinephrine increased I(sc) with an EC50 of 3 and 15 nM, respectively, and isoproterenol increased tissue cAMP of native canals with an EC50 of 5 nM. Agonists for adenosine, histamine, and vasopressin receptors had no effect on I(sc). Isoproterenol stimulation of I(sc) and cAMP was inhibited by ICI-118551 (IC50 = 6 microM for I(sc)) but not by CGP-20712A (1 microM) in primary cultures, and similar results were found in native epithelium. I(sc) was partially inhibited by basolateral Ba2+ (IC50 = 0.27 mM) and ouabain, whereas responses to genistein, glibenclamide, and DIDS did not fully fit the profile for CFTR. Our findings show that the canal epithelium contributes to endolymph homeostasis by secretion of Cl- under beta 2 adrenergic control with cAMP as second messenger, a process that parallels the adrenergic control of K+ secretion by vestibular dark cells. The current work points to one possible etiology of endolymphatic hydrops in Meniere's disease and may provide a basis for intervention.
Collapse
Affiliation(s)
- Pierre G Milhaud
- Institut National de la Santé et de la Recherche Médicale Unité 432 Vestibular Neurobiology, Université Montpellier II, 34095 Montpellier, France
| | | | | | | | | | | | | | | |
Collapse
|