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Gedye K, Poole-Crowe E, Shepherd M, Wilding A, Parton K, Lopez-Villalobos N, Cave N. Prevalence of the ABCB1-1Δ gene mutation in a sample of New Zealand Huntaway dogs. N Z Vet J 2023; 71:133-136. [PMID: 36786530 DOI: 10.1080/00480169.2023.2181238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
AIMS To determine the prevalence of the ATP Binding Cassette Subfamily B Member 1-1Δ mutation (ABCB1-1Δ; previously Multidrug Resistance 1 (MDR1) mutation) in a cohort of New Zealand Huntaway dogs. MATERIALS AND METHODS Samples were opportunistically collected from Huntaway dogs (n = 189) from throughout New Zealand. Buccal swabs were collected from 42 Huntaways from the Wairarapa region and 147 blood samples from Huntaways from the Gisborne, Waikato, Manawatū/Whanganui, Hawkes Bay, Canterbury and Otago regions. DNA was extracted from all samples and tested for the presence of the ABCB1-1Δ allele. RESULTS Of 189 Huntaway dogs that were tested, two were found to be heterozygous carriers of the ABCB1-1Δ allele and the remaining 187/189 dogs were homozygous for the wild type allele. No dogs homozygous for the mutation were identified. CONCLUSIONS AND CLINICAL RELEVANCE The results of this study show that the ABCB1-1Δ allele is present in Huntaway dogs. The low prevalence in this convenience sample suggests that the prevalence of this allele in the Huntaway population is likely to be low. We recommend that veterinary clinicians discuss the potential for this mutation in Huntaways with dog owners including the clinical implications for dogs that are homozygous for the mutated allele and the potential for testing for the mutation, as they would do for other known mutations.
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Affiliation(s)
- K Gedye
- Tāwharau Ora - School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | | | | | | | - K Parton
- Tāwharau Ora - School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - N Lopez-Villalobos
- School of Agriculture and the Environment, Massey University, Palmerston North, New Zealand
| | - N Cave
- Tāwharau Ora - School of Veterinary Science, Massey University, Palmerston North, New Zealand
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PREVALENCE OF THE ABCB1-1Δ GENE IN NONDOMESTIC SPECIES OF THE CANIDAE FAMILY. J Zoo Wildl Med 2021; 51:1007-1011. [PMID: 33480582 DOI: 10.1638/2020-0057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/24/2020] [Indexed: 11/21/2022] Open
Abstract
The ABCB1 gene is responsible for encoding the P-glycoprotein (P-gp) efflux transporter that prevents accumulation of exogenous substances in the body by utilizing ATP hydrolysis to transport these substances against their concentration gradient. In dogs, homozygous or heterozygous mutations for the previously described ABCB1-1Δ mutation lead to ineffective P-gp efflux transport function and puts the animal at risk for potentially devastating adverse drug effects. The purpose of this study was to evaluate ABCB1-1Δ gene mutation status in species belonging to the Canidae family, including each of the following: maned wolf (Chrysocyon brachyurus), gray wolf (Canis lupus), red wolf (Canis rufus), coyote (Canis latrans), dingo (Canis lupus dingo), New Guinea singing dog (Canis lupus dingo), arctic fox (Vulpes lagopus), and fennec fox (Vulpes zerda). These species were chosen based on an evolutionary study conducted by Belyaev that noted foxes, bred for temperament, tended to have similar behaviors seen in the modern-day dog. Wolves, known predecessors to the modern dog, were also included. In the current study, a buccal swab was performed on each animal and then tested at Washington State University's Veterinary Clinical Pharmacology Lab, where they were tested according to previously published methods validating buccal swab samples and polymerase chain reaction (PCR) -based genetic analysis. Knowledge of Canidae species ABCB1-1Δ gene mutation status allows for safe and effective therapeutic treatment of nondomestic animals, ensuring any anticipated adverse drug events are prevented. All eight species were found to have the wild-type ABCB1 gene and thus, expected to have normally functioning P-gp efflux transporters. Although these data can be used to guide clinical decision making, because of a small sample size, a more robust study is necessary to assess Canidae ABCB1-1Δ mutation status comprehensively.
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Myers MJ, Martinez M, Li F, Howard K, Yancy HF, Troutman L, Sharkey M. Impact of ABCB1 genotype in Collies on the pharmacokinetics of R- and S-fexofenadine. J Vet Pharmacol Ther 2018; 41:805-814. [PMID: 30020547 DOI: 10.1111/jvp.12696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 06/18/2018] [Indexed: 11/28/2022]
Abstract
Thirty-two Collies were used to determine the impact of ABCB1 genotype and phenotype on the plasma pharmacokinetics of fexofenadine's (Fex) R- and S-enantiomers after bolus Fex administration, as human P-gp exhibits stereoselectivity. Each Collie's ABCB1 genotype and ivermectin (IVM) sensitivity (phenotype) was determined prior to study enrolment. Wild-type (WT) Collies had lower plasma concentrations of the individual enantiomers as compared to heterozygous IVM nonsensitive (HNS), heterozygous IVM-sensitive (HS) and homozygous mutant (MUT) Collies. Based on pairwise statistical comparison, WT Collies had statistically significantly lower (AUC0-last ) and peak (Cmax ) values compared to HS, HNS and MUT Collies. Tmax was not influenced by genotype/phenotype. Inter-individual variability in PK metrics tended to be largest for WT Collies. Although the influence of genotype/phenotype on Fex PK occurred with the individual isomers, impairment of S-Fex absorption, particularly in the MUT dogs, exceeded that associated with R-Fex. Since Fex elimination occurs primarily via biliary excretion via a transporter other than P-glycoprotein, and based upon our understanding of Fex absorption kinetics, we attributed these differences primarily to the absorption portion of the profile. These differences are expressed in a stereo-specific manner. These results demonstrate the potential negative impact on estimates of drug effectiveness and toxicity, especially for P-gp substrates that do not exhibit Central Nervous System toxicities.
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Affiliation(s)
- Michael J Myers
- Office of Research, Division of Applied Veterinary Research, US Food and Drug Administration, Center for Veterinary Medicine, Laurel, Maryland
| | - Marilyn Martinez
- Office of New Animal Drug Evaluation, US Food and Drug Administration, Center for Veterinary Medicine, Rockville, Maryland
| | - Fei Li
- Office of Research, Division of Applied Veterinary Research, US Food and Drug Administration, Center for Veterinary Medicine, Laurel, Maryland
| | - Karyn Howard
- Office of Research, Division of Applied Veterinary Research, US Food and Drug Administration, Center for Veterinary Medicine, Laurel, Maryland
| | - Haile F Yancy
- Office of Research, Division of Applied Veterinary Research, US Food and Drug Administration, Center for Veterinary Medicine, Laurel, Maryland
| | - Lisa Troutman
- Office of New Animal Drug Evaluation, Division of Therapeutic Drugs for Non-food Animals, US Food and Drug Administration, Center for Veterinary Medicine, Rockville, Maryland
| | - Michele Sharkey
- Office of New Animal Drug Evaluation, Division of Therapeutic Drugs for Non-food Animals, US Food and Drug Administration, Center for Veterinary Medicine, Rockville, Maryland
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Dekel Y, Machluf Y, Stoler A, Aderet A, Baumel D, Kellerman E, Plotsky Y, Noked Partouche O, Elhalal G, Ben-Shlomo I, Bercovich D. Frequency of canine nt230(del4) MDR1 mutation in prone pure breeds, their crosses and mongrels in Israel - insights from a worldwide comparative perspective. BMC Vet Res 2017; 13:333. [PMID: 29132368 PMCID: PMC5683241 DOI: 10.1186/s12917-017-1251-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 10/31/2017] [Indexed: 11/25/2022] Open
Abstract
Background Sensitivity to macrocyclic lactones, which are commonly used in veterinary clinics, was first found in Rough Collies, and was attributed in 2001 to a 4 bp deletion in the MDR1 gene. The list of affected breeds currently includes 13 breeds. Researchers from different countries and continents examined the allelic frequencies of the nt230(del4) MDR1 mutation, emphasizing the clinical importance of this test not only to mutation-prone dogs, but also to their crosses and mongrels, since treatment of a deletion carrier with these compounds may lead to its death. In this study, the allelic frequencies of nt230(del4) MDR1 mutation in affected breeds, their crosses, unrelated pure breeds and mongrels are reported for the state of Israel (n = 1416 dogs). The Israeli data were compared with reports from the US, Europe, UK, Australia and Japan. Results The allelic frequencies of nt230(del4) MDR1 mutation in Israel for Australian, Swiss and German Shepherds (31%, 17% and 2.4%, respectively) are similar to the corresponding frequencies worldwide, much higher for Border Collies (4.8%), twice lower for Rough Collies (28%, compared to 55% or more elsewhere), and ~1% for mongrels. The frequencies for crosses of Australian Shepherd and Border Collies in Israel are 4 and 1.6 times lower, respectively, compared to the frequencies for the respective pure breeds. Conclusions This work, that for the first time presents the frequency of nt230(del4) MDR1 mutation in Israel, along with a worldwide survey, has implications for clinicians, owners and breeders of sheepdogs and their crosses and supports the need for extra care in treatment and in future breeding. Of note, the relative proportion of affected breeds, in the overall tested dogs, might be higher than their actual proportion in Israel due to directed samples collection by veterinarians for clinical purposes, as these are mainly limited to certain affected breeds or dogs that resemble them. Electronic supplementary material The online version of this article (10.1186/s12917-017-1251-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yaron Dekel
- Shamir Research Institute, University of Haifa, P.O.Box 97, 1290000, Kazerin, Israel. .,Zefat Academic College, Zefat, Israel. .,GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel.
| | - Yossy Machluf
- Specialist in the Fields of Genetics, Epidemiology and Molecular Biology, Rehovot, Israel
| | - Aviad Stoler
- GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
| | - Arava Aderet
- GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
| | - Daniel Baumel
- GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
| | - Efrat Kellerman
- GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
| | - Yoram Plotsky
- GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
| | - Oshrat Noked Partouche
- Shamir Research Institute, University of Haifa, P.O.Box 97, 1290000, Kazerin, Israel.,Tel Hai College, 12210, Tel-Hai, Israel
| | - Gal Elhalal
- Vetmarket Ltd. Industrial Park Hevel Modiin, P.O.Box 960, 6085001, Shoham, Israel
| | - Izhar Ben-Shlomo
- Zefat Academic College, Zefat, Israel.,Faculty of Medicine in the Galilee, Bar-Ilan University & Baruch Padeh Medical Center, Poria, Israel
| | - Dani Bercovich
- Tel Hai College, 12210, Tel-Hai, Israel.,GGA - Galil Genetic Analysis Ltd, P.O.Box 3664, 12900, Kazerin, Israel
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Deshpande D, Hill KE, Mealey KL, Chambers JP, Gieseg MA. The Effect of the Canine ABCB1-1Δ Mutation on Sedation after Intravenous Administration of Acepromazine. J Vet Intern Med 2016; 30:636-41. [PMID: 26822006 PMCID: PMC4913601 DOI: 10.1111/jvim.13827] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/14/2015] [Accepted: 12/16/2015] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Dog breeds with the ABCB1-1Δ mutation have substantially truncated nonfunctional P-glycoprotein. Dogs homozygous for this mutation (mut/mut) are susceptible to the toxic adverse effects of ivermectin, loperamide, and vincristine. Anecdotal reports suggested ABCB1 mut/mut dogs showed increased depth and duration of acepromazine sedation. HYPOTHESIS/OBJECTIVES That ABCB1 mut/mut dogs have increased depth and duration of sedation after acepromazine IV compared to normal dogs (nor/nor). ANIMALS Twenty-nine rough-coated collies were divided into 3 groups of dogs based on their ABCB1 genotype: 10 mut/mut, 10 mut/nor, and 9 nor/nor. METHODS Dogs were given 0.04 mg/kg of acepromazine IV. Level of sedation, heart rate, respiratory rate, and blood pressure were recorded for 6 hours after acepromazine administration. Area under the curves (AUCs) of the normalized sedation score results were calculated and compared. RESULTS The median sedation scores for ABCB1 mut/mut dogs were higher than nor/nor dogs at all time points and were higher in mut/nor dogs for the first 2 hours. These differences were not found to be significant for any individual time point (P > .05). The median sedation score AUC for mut/mut dogs was significantly higher than nor/nor dogs (P = .028), but the AUC for mut/nor dogs was not (P = .45). There were no significant differences between groups for heart rate, respiratory rate, and blood pressure (P > .05). CONCLUSIONS AND CLINICAL IMPORTANCE In ABCB1 mut/mut dogs acepromazine dose rates should be reduced and careful monitoring performed during sedation.
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Affiliation(s)
- D Deshpande
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
| | - K E Hill
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
| | - K L Mealey
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA
| | - J P Chambers
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
| | - M A Gieseg
- Veterinary Health Research, Waikato Innovation Park, Hamilton, New Zealand
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Mechanisms of Drug Resistance in Veterinary Oncology- A Review with an Emphasis on Canine Lymphoma. Vet Sci 2015; 2:150-184. [PMID: 29061939 PMCID: PMC5644636 DOI: 10.3390/vetsci2030150] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 07/22/2015] [Accepted: 08/04/2015] [Indexed: 01/09/2023] Open
Abstract
Drug resistance (DR) is the major limiting factor in the successful treatment of systemic neoplasia with cytotoxic chemotherapy. DR can be either intrinsic or acquired, and although the development and clinical implications are different, the underlying mechanisms are likely to be similar. Most causes for DR are pharmacodynamic in nature, result from adaptations within the tumor cell and include reduced drug uptake, increased drug efflux, changes in drug metabolism or drug target, increased capacity to repair drug-induced DNA damage or increased resistance to apoptosis. The role of active drug efflux transporters, and those of the ABC-transporter family in particular, have been studied extensively in human oncology and to a lesser extent in veterinary medicine. Methods reported to assess ABC-transporter status include detection of the actual protein (Western blot, immunohistochemistry), mRNA or ABC-transporter function. The three major ABC-transporters associated with DR in human oncology are ABCB1 or P-gp, ABCC1 or MRP1, and ABCG2 or BCRP, and have been demonstrated in canine cell lines, healthy dogs and dogs with cancer. Although this supports a causative role for these ABC-transporters in DR cytotoxic agents in the dog, the relative contribution to the clinical phenotype of DR in canine cancer remains an area of debate and requires further prospective studies.
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Myers MJ, Martinez M, Li H, Qiu J, Troutman L, Sharkey M, Yancy HF. Influence of ABCB1 Genotype in Collies on the Pharmacokinetics and Pharmacodynamics of Loperamide in a Dose-Escalation Study. Drug Metab Dispos 2015; 43:1392-407. [DOI: 10.1124/dmd.115.063735] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 07/07/2015] [Indexed: 11/22/2022] Open
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8
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L-1416, a novel MDR reversing agent with possible reduced calcium antagonism. Pharmacol Rep 2014; 66:1140-7. [DOI: 10.1016/j.pharep.2014.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 05/15/2014] [Accepted: 07/16/2014] [Indexed: 01/11/2023]
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Belz KM, Specht AJ, Johnson VS, Conway JA. MRI Findings in a Dog with Kernicterus. J Am Anim Hosp Assoc 2013; 49:286-92. [DOI: 10.5326/jaaha-ms-5881] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A severe increase in total bilirubin coincided with a decline in neurologic status to comatose in a 9 yr old spayed female mixed-breed dog being treated for immune-mediated hemolytic anemia. MRI of the brain was performed to investigate potential causes for the neurologic signs. MRI revealed bilaterally symmetrical hyperintensities within the caudate nuclei, globus pallidus, thalamus, deep cerebellar nuclei, and cortical gray matter on T2-weighted and fluid-attenuated inversion recovery (FLAIR) sequences, which coincided with areas of bilirubin deposition and neuronal necrosis (kernicterus) identified on necropsy examination. This is the second case report of an adult dog exhibiting kernicterus, and the first report to document MRI findings associated with that condition. Kernicterus is an uncommonly reported complication of hyperbilirubinemia in dogs, but is potentially underreported due to difficulties in recognizing subtle lesions and distinguishing kernicterus from other potential causes of neurologic abnormalities with readily available antemortem tests. MRI may be helpful in supporting the diagnosis of kernicterus.
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Affiliation(s)
- Katie M. Belz
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL
| | - Andrew J. Specht
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL
| | - Victoria S. Johnson
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL
| | - Julia A. Conway
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL
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Swain MD, Orzechowski KL, Swaim HL, Jones YL, Robl MG, Tinaza CA, Myers MJ, Jhingory MV, Buckely LE, Lancaster VA, Yancy HF. P-gp substrate-induced neurotoxicity in an Abcb1a knock-in/Abcb1b knock-out mouse model with a mutated canine ABCB1 targeted insertion. Res Vet Sci 2012. [PMID: 23186803 DOI: 10.1016/j.rvsc.2012.10.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Certain dog breeds, especially Collies, are observed to exhibit neurotoxicity to avermectin drugs, which are P-glycoprotein (P-gp) substrates. This neurotoxicity is due to an ABCB1 gene mutation (ABCB1-1Δ) that results in non-functional P-gp expression. A developed Abcb1a knock-in/Abcb1b knock-out mouse model expressing the ABCB1-1Δ canine gene was previously reported and mice exhibited sensitivity upon ivermectin administration. Here, model and wild-type mice were administered P-gp substrates doramectin, moxidectin, and digoxin. While knock-in/knock-out mice exhibited ataxia, lethargy and tremor, wild-type mice remained unaffected. In addition, no neurotoxic clinical signs were observed in either mouse type administered domperidone, a P-gp substrate with no reported neurotoxicity in ABCB1-1Δ Collies. Overall, neurotoxic signs displayed by model mice closely paralleled those observed in ivermectin-sensitive Collies. This model can be used to identify toxic P-gp substrates with altered safety in dog populations and may reduce dog use in safety studies that are part of the drug approval process.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B/genetics
- ATP Binding Cassette Transporter, Subfamily B/physiology
- ATP Binding Cassette Transporter, Subfamily B, Member 1/drug effects
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- Animals
- Anti-Infective Agents/toxicity
- Brain/drug effects
- Digoxin/toxicity
- Disease Models, Animal
- Dog Diseases/chemically induced
- Dog Diseases/drug therapy
- Dogs
- Domperidone/toxicity
- Female
- Ivermectin/analogs & derivatives
- Ivermectin/toxicity
- Macrolides/toxicity
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mutagenesis, Insertional/genetics
- Mutagenesis, Insertional/methods
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Affiliation(s)
- M D Swain
- U.S. Food and Drug Administration, Center for Veterinary Medicine, Office of Research, 8401 Muirkirk Road, Laurel, MD 20708, United States.
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Tappin SW, Goodfellow MR, Peters IR, Day MJ, Hall EJ, Mealey KL. Frequency of the mutant MDR1
allele in dogs in the UK. Vet Rec 2012; 171:72. [DOI: 10.1136/vr.100633] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- S. W. Tappin
- School of Veterinary Sciences; University of Bristol; Langford North Somerset BS40 5DU UK
| | - M. R. Goodfellow
- School of Veterinary Sciences; University of Bristol; Langford North Somerset BS40 5DU UK
| | - I. R. Peters
- School of Veterinary Sciences; University of Bristol; Langford North Somerset BS40 5DU UK
| | - M. J. Day
- School of Veterinary Sciences; University of Bristol; Langford North Somerset BS40 5DU UK
| | - E. J. Hall
- School of Veterinary Sciences; University of Bristol; Langford North Somerset BS40 5DU UK
| | - K. L. Mealey
- Department of Veterinary Clinical Sciences; Washington State University; Pullman WA 99164 USA
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MacKay CS, Mattoon JS, Roberts GD, Tucker RL, Morimoto TR, Mealey KL. Evaluation of the biliary and brain distribution of technetium Tc 99m sestamibi in healthy dogs with the ABCB1 wildtype genotype before and after treatment with spinosad. Am J Vet Res 2012; 73:814-20. [DOI: 10.2460/ajvr.73.6.814] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Bissonnette S, Paradis M, Daneau I, Silversides DW. TheABCB1-1Δmutation is not responsible for subchronic neurotoxicity seen in dogs of non-collie breeds following macrocyclic lactone treatment for generalized demodicosis. Vet Dermatol 2009; 20:60-6. [DOI: 10.1111/j.1365-3164.2008.00731.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mealey KL, Meurs KM. Breed distribution of the ABCB1-1Δ (multidrug sensitivity) polymorphism among dogs undergoing ABCB1 genotyping. J Am Vet Med Assoc 2008; 233:921-4. [DOI: 10.2460/javma.233.6.921] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mealey K, Fidel J, Gay J, Impellizeri J, Clifford C, Bergman P. ABCB1-1Δ Polymorphism Can Predict Hematologic Toxicity in Dogs Treated with Vincristine. J Vet Intern Med 2008; 22:996-1000. [DOI: 10.1111/j.1939-1676.2008.0122.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Implications of ABC transporters on the disposition of typical veterinary medicinal products. Eur J Pharmacol 2008; 585:510-9. [PMID: 18417119 DOI: 10.1016/j.ejphar.2008.03.014] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Revised: 02/21/2008] [Accepted: 03/03/2008] [Indexed: 01/16/2023]
Abstract
The ATP-Binding Cassette (ABC) transporters ABCB1, ABCC2 and ABCG2 are efflux transporters that facilitate the excretion of drugs, contribute to the function of biological barriers and maintain low cytoplasmic substrate concentrations in cells. ABC transporters modulate drug absorption, distribution and elimination according to the level of expression in the intestine, liver, kidney, and at biological barriers such as the blood-brain barrier. Moreover individual transporters are known to convey multi-drug resistance to tumour cells. While these diverse functions have been described in laboratory animal studies and in humans, the available information is very limited in animal species that are typical veterinary patients. This brief review summarizes the available data on organ distribution and expression levels in animals, genetic defects in dogs resulting in a non-functional P-gp expression, and describes examples of kinetic investigations directed to assess the clinical relevance of species differences in ABC-transporter expression.
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