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Freyer DR, Orgel E, Knight K, Krailo M. Special considerations in the design and implementation of pediatric otoprotection trials. J Cancer Surviv 2023; 17:4-16. [PMID: 36637630 DOI: 10.1007/s11764-022-01312-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 12/07/2022] [Indexed: 01/14/2023]
Abstract
PURPOSE Cisplatin-induced hearing loss (CIHL) is a common late effect after childhood cancer treatment having profound, lifelong consequences that lower quality of life. The recent identification of intravenous sodium thiosulfate (STS) as an effective agent for preventing pediatric CIHL represents a paradigm shift that has created new opportunities for expanding STS usage and developing additional otoprotectants. The purpose of this paper is to discuss key considerations and recommendations for the design and implementation of future pediatric otoprotection trials. METHODS An approach synthesizing published data and collective experience was used. RESULTS Key issues were identified in the categories of translational research, trial designs for systemic and intratympanic agents, measurement of ototoxicity, and biostatistical challenges. CONCLUSIONS Future pediatric otoprotection trials should emphasize (1) deep integration of preclinical and early-phase studies; (2) an embedded or free-standing design for systemic agents based on mechanistic considerations; (3) use of suitable audiologic testing batteries for children, SIOP grading criteria, and submission of raw audiologic data for central review; and (4) novel endpoints and innovative study designs that maximize trial efficiency for limited sample sizes. Additional recommendations include routine collection of DNA specimens for assessing modifying effects of genetic susceptibility and meaningful inclusion of patient/family advocates for informing trial development. IMPLICATIONS FOR CANCER SURVIVORS Changing the historical paradigm from acceptance to prevention of pediatric CIHL through expanded research with existing and emerging otoprotectants will dramatically improve quality of life for future childhood cancer survivors exposed to cisplatin.
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Affiliation(s)
- David R Freyer
- Cancer and Blood Disease Institute, Children's Hospital Los Angeles, Los Angeles, CA, USA.
- Departments of Pediatrics, Medicine, and Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
| | - Etan Orgel
- Cancer and Blood Disease Institute, Children's Hospital Los Angeles, Los Angeles, CA, USA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Kristin Knight
- Department of Audiology, Doernbecher Children's Hospital, Portland, OR, USA
- Oregon Health and Science University, Portland, OR, USA
| | - Mark Krailo
- Department of Population and Public Health Sciences, University of Southern California, Los Angeles, CA, USA
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Guthrie OW, Spankovich C. Emerging and established therapies for chemotherapy-induced ototoxicity. J Cancer Surviv 2023; 17:17-26. [PMID: 36637631 DOI: 10.1007/s11764-022-01317-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 12/07/2022] [Indexed: 01/14/2023]
Abstract
PURPOSE Ototoxicity is considered a dose-limiting side effect of some chemotherapies. Hearing loss, in particular, can have significant implications for the quality of life for cancer survivors. Here, we review therapeutic approaches to mitigating ototoxicity related to chemotherapy. METHODS Literature review. CONCLUSIONS Numerous otoprotection strategies are undergoing active investigation. However, numerous challenges exist to confer adequate protection while retaining the anti-cancer efficacy of the chemotherapy. IMPLICATIONS FOR CANCER SURVIVORS Ototoxicity can have significant implications for cancer survivors, notably those receiving cisplatin. Clinical translation of multiple otoprotection approaches will aid in limiting these consequences.
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Affiliation(s)
- O'neil W Guthrie
- Cell & Molecular Pathology Laboratory, Communication Sciences and Disorders, Northern Arizona University, Flagstaff, AZ, USA
| | - Christopher Spankovich
- Department of Otolaryngology Head and Neck Surgery, University of Mississippi Medical Center, Jackson, MS, USA.
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Lui G, Bouazza N, Denoyelle F, Moine M, Brugières L, Chastagner P, Corradini N, Entz-Werle N, Vérité C, Landmanparker J, Sudour-Bonnange H, Pasquet M, Verschuur A, Faure-Conter C, Doz F, Tréluyer JM. Association between genetic polymorphisms and platinum-induced ototoxicity in children. Oncotarget 2018; 9:30883-30893. [PMID: 30112115 PMCID: PMC6089394 DOI: 10.18632/oncotarget.25767] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/25/2018] [Indexed: 12/20/2022] Open
Abstract
Platinum is extensively used in the treatment of several childhood cancers. However, ototoxicity is one of the most notable adverse effects, especially in children. Several studies suggest that genetics may predict its occurrence. Here, polymorphisms associated with platinum-induced ototoxicity were selected from the literature and were investigated in a pediatric population treated with platinum-based agents. In this retrospective study, patients treated with cisplatin and/or carboplatin were screened. The patients with pre- and post-treatment audiogram (Brock criteria) available were included. We selected polymorphisms that have previously been associated with cisplatin ototoxicity with a minor allele frequency ≥30%. Deletion of GSTM1 and GSTT1, rs1799735 (GSTM3), rs1695 (GSTP1), rs4880 (SOD2), rs2228001 (XPC), rs1799793 (XPD) and rs4788863 (SLC16A5) were investigated. Data of one hundred and six children matching the eligible criteria were analyzed. Thirty-three patients (31%) developed ototoxicity (with a Brock grade ≥2). The probability of hearing loss increased significantly in patients carrying the null genotype for GSTT1 (P = 0.03), A/A genotype at rs1695 (P = 0.01), and C/C genotype at rs1799793 (P = 0.008). We also showed an association of the cumulative doses of carboplatin with cisplatin ototoxicity (P <0.05). To conclude, deletion of GSTT1, rs1695 and rs1799793 may constitute potential predictors of platinum-induced ototoxicity.
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Affiliation(s)
- Gabrielle Lui
- University of Paris Descartes, EA 7323, Sorbonne Paris-Cité, France.,CIC-1419 Inserm, Cochin-Necker, Paris, France
| | - Naïm Bouazza
- University of Paris Descartes, EA 7323, Sorbonne Paris-Cité, France.,CIC-1419 Inserm, Cochin-Necker, Paris, France.,Clinical Research Unit of Paris Descartes Necker Cochin, AP-HP, Paris, France
| | - Françoise Denoyelle
- Department of Pediatric Otolaryngology, Necker Children's Hospital, Paris, France
| | - Marion Moine
- University of Paris Descartes, EA 7323, Sorbonne Paris-Cité, France
| | - Laurence Brugières
- Department of Children and Adolescents Oncology, Gustave Roussy, Villejuif, France
| | - Pascal Chastagner
- Department of Pediatric Onco-Hematology, Children's Hospital, Vandoeuvre Les Nancy, France
| | - Nadège Corradini
- Pediatric Oncology Department, Mother-Children Hospital, Nantes, France
| | | | - Cécile Vérité
- Pediatric Hematology Department, Bordeaux University Hospital, Bordeaux, France
| | - Judith Landmanparker
- Sorbonne University, Department of Pediatric Hematology Oncology, APHP, Trousseau Hospital, Paris, France
| | - Hélène Sudour-Bonnange
- Pediatric Oncology Unit, Children, Adolescents and Young Adults Unit, Oscar Lambret Center, Lille, France
| | - Marlène Pasquet
- Children's Hospital, University Hospital of Toulouse, Toulouse, France
| | - Arnauld Verschuur
- Pediatric Oncology Department, La Timone Children's Hospital, Marseilles, France
| | | | - François Doz
- Oncology Center SIREDO, Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer, Curie Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Jean-Marc Tréluyer
- University of Paris Descartes, EA 7323, Sorbonne Paris-Cité, France.,CIC-1419 Inserm, Cochin-Necker, Paris, France.,Clinical Research Unit of Paris Descartes Necker Cochin, AP-HP, Paris, France.,Department of Clinical Pharmacology, Cochin Hospital AP-HP, Paris, France
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Guthrie OW. Functional consequences of inducible genetic elements from the p53 SOS response in a mammalian organ system. Exp Cell Res 2017; 359:50-61. [DOI: 10.1016/j.yexcr.2017.08.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 08/02/2017] [Accepted: 08/05/2017] [Indexed: 10/19/2022]
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Guthrie OW. Noise Stress Induces an Epidermal Growth Factor Receptor/Xeroderma Pigmentosum-A Response in the Auditory Nerve. J Histochem Cytochem 2017; 65:173-184. [PMID: 28056182 DOI: 10.1369/0022155416683661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
In response to toxic stressors, cancer cells defend themselves by mobilizing one or more epidermal growth factor receptor (EGFR) cascades that employ xeroderma pigmentosum-A (XPA) to repair damaged genes. Recent experiments discovered that neurons within the auditory nerve exhibit basal levels of EGFR+XPA co-expression. This finding implied that auditory neurons in particular or neurons in general have the capacity to mobilize an EGFR+XPA defense. Therefore, the current study tested the hypothesis that noise stress would alter the expression pattern of EGFR/XPA within the auditory nerve. Design-based stereology was used to quantify the proportion of neurons that expressed EGFR, XPA, and EGFR+XPA with and without noise stress. The results revealed an intricate neuronal response that is suggestive of alterations to both co-expression and individual expression of EGFR and XPA. In both the apical and middle cochlear coils, the noise stress depleted EGFR+XPA expression. Furthermore, there was a reduction in the proportion of neurons that expressed XPA-alone in the middle coils. However, the noise stress caused a significant increase in the proportion of neurons that expressed EGFR-alone in the middle coils. The basal cochlear coils failed to mobilize a significant response to the noise stress. These results suggest that EGFR and XPA might be part of the molecular defense repertoire of the auditory nerve.
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Affiliation(s)
- O'neil W Guthrie
- Cell & Molecular Pathology Laboratory, Department of Communication Sciences and Disorders, Northern Arizona University, Flagstaff, Arizona (OWG).,Research Service-151, Loma Linda Veterans Affairs Medical Center, Loma Linda, California (OWG).,Department of Otolaryngology and Head & Neck Surgery, School of Medicine, Loma Linda University Medical Center, Loma Linda, California (OWG)
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Guthrie OW. Localization and distribution of neurons that co-express xeroderma pigmentosum-A and epidermal growth factor receptor within Rosenthal's canal. Acta Histochem 2015; 117:688-95. [PMID: 26493720 DOI: 10.1016/j.acthis.2015.10.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 10/06/2015] [Accepted: 10/10/2015] [Indexed: 12/12/2022]
Abstract
Xeroderma pigmentosum-A (XPA) is a C4-type zinc-finger scaffolding protein that regulates the removal of bulky-helix distorting DNA damage products from the genome. Phosphorylation of serine residues within the XPA protein is associated with improved protection of genomic DNA and cell death resistance. Therefore, kinase signaling is one important mechanism for regulating the protective function of XPA. Previous experiments have shown that spiral ganglion neurons (SGNs) may mobilize XPA as a general stress response to chemical and physical ototoxicants. Therapeutic optimization of XPA via kinase signaling could serve as a means to improve DNA repair capacity within neurons following injury. The kinase signaling activity of the epidermal growth factor receptor (EGFR) has been shown in tumor cell lines to increase the repair of DNA damage products that are primarily repaired by XPA. Such observations suggest that EGFR may regulate the protective function of XPA. However, it is not known whether SGNs in particular or neurons in general could co-express XPA and EGFR. In the current study gene and protein expression of XPA and EGFR were determined from cochlear homogenates. Immunofluorescence assays were then employed to localize neurons expressing both EGFR and XPA within the ganglion. This work was then confirmed with double-immunohistochemistry. Rosenthal's canal served as the reference space in these experiments and design-based stereology was employed in first-order stereology quantification of immunoreactive neurons. The results confirmed that a population of SGNs that constitutively express XPA may also express the EGFR. These results provide the basis for future experiments designed to therapeutically manipulate the EGFR in order to regulate XPA activity and restore gene function in neurons following DNA damage.
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Histopathology of the inner ear in patients with xeroderma pigmentosum and neurologic degeneration. Otol Neurotol 2014; 34:1230-6. [PMID: 23928520 DOI: 10.1097/mao.0b013e31829795e9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Xeroderma pigmentosum (XP) is a rare autosomal recessive disease caused by mutations resulting in defective repair of DNA damage. XP patients have a markedly increased risk of ultraviolet-induced neoplasms and premature aging of sun-exposed tissue. Approximately 25% of XP patients in the United States have neurologic abnormalities including progressive sensorineural hearing loss (SNHL). OBJECTIVE To describe the temporal bone histopathology in 2 individuals with XP (XPA and XPD) with neurologic degeneration and to discuss the possible causes of deafness in these patients. METHODS Temporal bones were removed at autopsy and studied using light microscopy. RESULTS In the case with XPD, the organ of Corti was missing throughout the cochlea, whereas the case with XPA demonstrated scattered presence of sensory cells in the middle and apical turns. In both cases, there was moderate-to-severe patchy atrophy of the stria vascularis in all turns, and cochlear neurons were severely atrophied compared with age-matched controls, with loss of both peripheral dendrites and central axons. There was severe degeneration of Scarpa's ganglion in the case with XPA. CONCLUSION Two cases of XP with neurologic degeneration are reported. The case with XPD demonstrated a more severe audiologic phenotype than XPA, although both had similar findings such as atrophy of the organ of Corti, stria vascularis, and spiral ganglia leading to severe or profound SNHL by the third decade of life. It is not clear if the neuronal degeneration in the inner ear was primary or secondary to loss of neuroepithelial cells.
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Guthrie OW, Xu H. Noise exposure potentiates the subcellular distribution of nucleotide excision repair proteins within spiral ganglion neurons. Hear Res 2012; 294:21-30. [DOI: 10.1016/j.heares.2012.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Revised: 09/05/2012] [Accepted: 09/06/2012] [Indexed: 01/08/2023]
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Postnatal development, maturation and aging in the mouse cochlea and their effects on hair cell regeneration. Hear Res 2012; 297:68-83. [PMID: 23164734 DOI: 10.1016/j.heares.2012.11.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 10/22/2012] [Accepted: 11/07/2012] [Indexed: 12/23/2022]
Abstract
The organ of Corti in the mammalian inner ear is comprised of mechanosensory hair cells (HCs) and nonsensory supporting cells (SCs), both of which are believed to be terminally post-mitotic beyond late embryonic ages. Consequently, regeneration of HCs and SCs does not occur naturally in the adult mammalian cochlea, though recent evidence suggests that these cells may not be completely or irreversibly quiescent at earlier postnatal ages. Furthermore, regenerative processes can be induced by genetic and pharmacological manipulations, but, more and more reports suggest that regenerative potential declines as the organ of Corti continues to age. In numerous mammalian systems, such effects of aging on regenerative potential are well established. However, in the cochlea, the problem of regeneration has not been traditionally viewed as one of aging. This is an important consideration as current models are unable to elicit widespread regeneration or full recovery of function at adult ages yet regenerative therapies will need to be developed specifically for adult populations. Still, the advent of gene targeting and other genetic manipulations has established mice as critically important models for the study of cochlear development and HC regeneration and suggests that auditory HC regeneration in adult mammals may indeed be possible. Thus, this review will focus on the pursuit of regeneration in the postnatal and adult mouse cochlea and highlight processes that occur during postnatal development, maturation, and aging that could contribute to an age-related decline in regenerative potential. Second, we will draw upon the wealth of knowledge pertaining to age related senescence in tissues outside of the ear to synthesize new insights and potentially guide future research aimed at promoting HC regeneration in the adult cochlea.
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Guthrie OW. Dynamic compartmentalization of DNA repair proteins within spiral ganglion neurons in response to noise stress. Int J Neurosci 2012; 122:757-66. [PMID: 22900489 DOI: 10.3109/00207454.2012.721828] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACT In response to stress, spiral ganglion neurons may remodel intracellular pools of DNA repair proteins. This hypothesis was addressed by determining the intracellular location of three classic DNA excision repair proteins (XPA, CSA, and XPC) within the neurons under normal conditions, one day after noise stress (105 dB/4 hr) and following DNA repair adjuvant therapy with carboxy alkyl esters (CAEs; 160 mg/kg/28 days). Under normal conditions, three intracellular compartments were enriched with at least one repair protein. These intracellular compartments were designated nuclear, cytoplasmic, and perinuclear. After the noise stress each repair protein aggregated in the cytoplasm. After CAE therapy each intracellular compartment was enriched with the three DNA repair proteins. Combining noise stress with CAE therapy resulted in the enrichment of at least two repair proteins in each intracellular compartment. The combined results suggest that in response to noise stress and/or otoprotective therapy, spiral ganglion neurons may selectively remodel compartmentalized DNA repair proteins.
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Affiliation(s)
- O'neil W Guthrie
- Research Service-151, Loma Linda Veterans Affairs Medical Center, Loma Linda, California 92357, USA. O’
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Carboxy alkyl esters of Uncaria tomentosa augment recovery of sensorineural functions following noise injury. Brain Res 2011; 1407:97-106. [DOI: 10.1016/j.brainres.2011.06.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 05/25/2011] [Accepted: 06/17/2011] [Indexed: 11/21/2022]
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Abstract
OBJECTIVE Human mutations in the DNA repair genes, Xeroderma pigmentosum (XP)-C and XPA result in hearing loss, which has fueled the hypothesis that there is a significant demand for these genes in protecting cochlear genetic material. Therefore, we quantified the level of XPC and XPA mRNA in the mammalian cochlea. DESIGN XPC and XPA mRNAs were purified from the cochlea of 15 Fischer344 rats and quantified using SYBR Green chemistry. Another 15 Fischer344 rats were sacrificed for immunolocalization of XPC and XPA polypeptides in the cochlea and kidney (control organ). RESULTS XP mRNA levels were up to 95% (XPA) and 69% (XPC) of the respective maximum expression capacity of each gene. In addition, these cochlear levels were up to sixfold (XPC) and threefold (XPA) greater than that of the kidney, which is known to exhibit XP-DNA repair activity that is greater than most organs of the body. Immunohistochemistry revealed that most kidney and cochlear cells were immunopositive. CONCLUSION These data suggest that under normal conditions the cochlea is experiencing persistent genomic stress that helps to explain the hypersensitivity of the cochlea to exogenous stressors (ototoxic xenobiotics and/or acoustic-overexposure) as well as provide a basis to interpret hearing loss among patients with XP.
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Guthrie OW. Preincision complex-I from the excision nuclease reaction among cochlear spiral limbus and outer hair cells. J Mol Histol 2008; 39:617-25. [DOI: 10.1007/s10735-008-9202-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Accepted: 10/14/2008] [Indexed: 12/01/2022]
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