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Boukhalfa A, Robinson SR, Meola DM, Robinson NA, Ling LA, LaMastro JN, Upshaw JN, Pulakat L, Jaffe IZ, London CA, Chen HH, Yang VK. Using cultured canine cardiac slices to model the autophagic flux with doxorubicin. PLoS One 2023; 18:e0282859. [PMID: 36928870 PMCID: PMC10019679 DOI: 10.1371/journal.pone.0282859] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 01/18/2023] [Accepted: 02/19/2023] [Indexed: 03/18/2023] Open
Abstract
Chemotherapy-induced impairment of autophagy is implicated in cardiac toxicity induced by anti-cancer drugs. Imperfect translation from rodent models and lack of in vitro models of toxicity has limited investigation of autophagic flux dysregulation, preventing design of novel cardioprotective strategies based on autophagy control. Development of an adult heart tissue culture technique from a translational model will improve investigation of cardiac toxicity. We aimed to optimize a canine cardiac slice culture system for exploration of cancer therapy impact on intact cardiac tissue, creating a translatable model that maintains autophagy in culture and is amenable to autophagy modulation. Canine cardiac tissue slices (350 μm) were generated from left ventricular free wall collected from euthanized client-owned dogs (n = 7) free of cardiovascular disease at the Foster Hospital for Small Animals at Tufts University. Cell viability and apoptosis were quantified with MTT assay and TUNEL staining. Cardiac slices were challenged with doxorubicin and an autophagy activator (rapamycin) or inhibitor (chloroquine). Autophagic flux components (LC3, p62) were quantified by western blot. Cardiac slices retained high cell viability for >7 days in culture and basal levels of autophagic markers remained unchanged. Doxorubicin treatment resulted in perturbation of the autophagic flux and cell death, while rapamycin co-treatment restored normal autophagic flux and maintained cell survival. We developed an adult canine cardiac slice culture system appropriate for studying the effects of autophagic flux that may be applicable to drug toxicity evaluations.
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Affiliation(s)
- Asma Boukhalfa
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, United States of America
| | - Sally R Robinson
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
| | - Dawn M Meola
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
| | - Nicholas A Robinson
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
| | - Lauren A Ling
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, United States of America
| | - Joey N LaMastro
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
| | - Jenica N Upshaw
- Tufts University School of Medicine, Boston, Massachusetts, United States of America
- Division of Cardiology, Tufts Medical Center, Boston, Massachusetts, United States of America
| | - Lakshmi Pulakat
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, United States of America
- Tufts University School of Medicine, Boston, Massachusetts, United States of America
| | - Iris Z Jaffe
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, United States of America
- Tufts University School of Medicine, Boston, Massachusetts, United States of America
| | - Cheryl A London
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
| | - Howard H Chen
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, United States of America
- Tufts University School of Medicine, Boston, Massachusetts, United States of America
| | - Vicky K Yang
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, United States of America
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Pulakat L, Chen HH, Gavini MP, Ling LA, Tang Y, Mehm A, Martin GL, Beale CN, Mooney BP, Sun H. Transdermal Delivery of High Molecular Weight Antibiotics to Deep Tissue Infections via Droplette Micromist Technology Device (DMTD). Pharmaceutics 2022; 14:976. [PMID: 35631562 PMCID: PMC9146216 DOI: 10.3390/pharmaceutics14050976] [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] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/24/2022] [Accepted: 04/27/2022] [Indexed: 02/05/2023] Open
Abstract
Wound infection by multidrug-resistant (MDR) bacteria is a major disease burden. Systemic administration of broad-spectrum antibiotics colistin methanesulfonate (CMS) and vancomycin are the last lines of defense against deep wound infections by MDR bacteria. However, systemic administration of CMS and vancomycin are linked to life-threatening vital organ damage. Currently there are no effective topical application strategies to deliver these high molecular weight antibiotics across the stratum corneum. To overcome this difficulty, we tested if high molecular weight antibiotics delivered by Droplette micromist technology device (DMTD), a transdermal delivery device that generates a micromist capable of packaging large molecules, could attenuate deep skin tissue infections. Using green fluorescent protein-tagged E. coli and live tissue imaging, we show that (1) the extent of attenuation of deep-skin E. coli infection was similar when treated with topical DMTD- or systemic IP (intraperitoneal)-delivered CMS; (2) DMTD-delivered micromist did not spread the infection deeper; (3) topical DMTD delivery and IP delivery resulted in similar levels of vancomycin in the skin after a 2 h washout period; and (4) IP-delivered vancomycin was about 1000-fold higher in kidney and plasma than DMTD-delivered vancomycin indicating systemic toxicity. Thus, topical DMTD delivery of these antibiotics is a safe treatment for the difficult-to-treat deep skin tissue infections by MDR bacteria.
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Affiliation(s)
- Lakshmi Pulakat
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
- School of Medicine, Tufts University, Boston, MA 02111, USA;
- Division of Cardiovascular Medicine, Department of Medicine, University of Missouri, Columbia, MO 65211, USA
| | - Howard H. Chen
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
- School of Medicine, Tufts University, Boston, MA 02111, USA;
| | | | - Lauren A. Ling
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
- School of Medicine, Tufts University, Boston, MA 02111, USA;
| | - Yinian Tang
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
| | - Alexander Mehm
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
| | - Gregory L. Martin
- Tufts Medical Center, Molecular Cardiology Research Institute, Boston, MA 02111, USA; (H.H.C.); (L.A.L.); (Y.T.); (A.M.); (G.L.M.)
| | | | - Brian P. Mooney
- Charles W. Gehrke Proteomics Center, Division of Biochemistry, University of Missouri, Columbia, MO 65211, USA;
| | - Hongmin Sun
- Division of Cardiovascular Medicine, Department of Medicine, University of Missouri, Columbia, MO 65211, USA
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