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Rose L, Khuhro A, Minta A, Novice M, Novice T, Lustberg MB, Ruddy KJ, Rake EC, Loprinzi CL, Dulmage B. Eyebrow and Eyelash Loss in Patients With Cancer. J Drugs Dermatol 2024; 23:327-331. [PMID: 38709698 DOI: 10.36849/jdd.8003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Though it is widely acknowledged that cancer treatments cause hair loss on the scalp, there are limited data on how they affect eyebrow and eyelash hairs. Patients with eyebrow and eyelash loss, or madarosis, seek various treatment options ranging from camouflage techniques with makeup, permanent tattoos, and prescription medications. Though not yet studied in patients with cancer-induced madarosis, techniques such as scalp cooling, cryotherapy, and topical vasoconstrictors are promising preventative options. More robust research is needed to improve both the quality and quantity of available treatment and preventative options. There is a clear need for dermatologists to play a role in supportive oncodermatology for patients who experience eyebrow and eyelash loss secondary to chemotherapy, endocrine therapies, and radiation therapy. J Drugs Dermatol. 2024;23(5):327-331. doi:10.36849/JDD.8003.
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Gray AN, Mital R, Minta A, Waters M, Almhana F, Hydol-Smith J, Kaffenberger BH. Quality of Life with Neutrophilic Dermatoses. Dermatol Clin 2024; 42:329-338. [PMID: 38423691 DOI: 10.1016/j.det.2023.08.011] [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] [Indexed: 03/02/2024]
Abstract
Neutrophilic dermatoses (NDs) encompass a wide range of cutaneous and extracutaneous manifestations, many of which impair quality of life (QoL) and are difficult to treat. Although NDs are transient and mild, others are chronic, severely debilitating conditions with profound impacts on QoL, including pain, mental health, occupational limitations, and sexual health implications. Current literature lacks attention to these unique care challenges to the ND patient population. The authors aim to summarize what is currently known about QoL in NDs and identify which diseases would benefit from additional research and disease-specific QoL assessment.
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Affiliation(s)
- Ashley N Gray
- Department of Dermatology, Ohio State University Wexner Medical Center, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA; The Ohio State University College of Medicine, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA
| | - Rohan Mital
- Department of Dermatology, Ohio State University Wexner Medical Center, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA; The Ohio State University College of Medicine, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA
| | - Abena Minta
- Department of Dermatology, Ohio State University Wexner Medical Center, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA; The Ohio State University College of Medicine, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA
| | - Margo Waters
- The Ohio State University College of Medicine, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA
| | - Farah Almhana
- The Ohio State University College of Medicine, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA
| | - Jourdan Hydol-Smith
- Texas A&M University School of Medicine, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Benjamin H Kaffenberger
- Department of Dermatology, Ohio State University Wexner Medical Center, 2012 Kenny Road, 2nd Floor, Columbus, OH 43221, USA.
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Rose L, Minta A, Plaza J, Cohn DE, Dulmage B. Mitogen-Activated Protein Kinase Inhibitor-Induced Inflammatory Alopecia in Woman With Ovarian Cancer. J Drugs Dermatol 2024; 23:e102-e103. [PMID: 38564383 DOI: 10.36849/jdd.7802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Inflammatory alopecia is an increasingly reported side effect of targeted cancer therapies. Here we report one case of inflammatory alopecia secondary to mitogen-activated protein kinase kinase (MEK) inhibitor agent Trametinib in a woman with ovarian cancer. Biopsies of the scalp were consistent with early scarring alopecia compatible with drug-induced alopecia. Significant improvement in hair loss occurred after treatment with intralesional Kenalog (ILK) injections and oral isotretinoin. Though acute alopecia has been described in patients using MEK inhibitors, this is the first reported case of inflammatory alopecia. J Drugs Dermatol. 2024;23(4):7802. doi:10.36849/JDD.7802e  .
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Minta A, Rose L, Park C, Ramaswamy B, Stover D, Gatti-Mays M, Cherian M, Williams N, Sudheendra P, Wesolowski R, Sardesai S, Lustberg M, Loprinzi CL, Ruddy KJ, Cathcart-Rake E, Trovato S, Dulmage B. Retrospective cohort study of CDK4/6-inhibitor-induced alopecia in breast cancer patients. Support Care Cancer 2023; 31:717. [PMID: 37991653 DOI: 10.1007/s00520-023-08160-0] [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: 04/16/2023] [Accepted: 11/03/2023] [Indexed: 11/23/2023]
Abstract
PURPOSE Dermatologic adverse events commonly result in the interruption of oncologic treatment, and targeted therapies are the most frequently interrupted class of anticancer agents. Alopecia is a common cutaneous adverse event reported with CK4/6i therapy. Though the clinical characteristics and therapeutic response of EIA have been well documented, few studies have characterized alopecia in patients treated with CDK4/6i. METHODS This study analyzed a retrospective cohort of 28 breast cancer patients diagnosed with endocrine-induced alopecia (EIA) or CDKiA. Comparative analysis of the clinical characteristics of alopecia and therapeutic response to minoxidil was conducted. Therapeutic response to minoxidil (LDOM or topical [5%] solution or foam) was assessed by both Dean Scale and qualitative clinical improvement by comparison of pretreatment and posttreatment clinical images by single-blinded, board-certified academic dermatologists (ST and BD). RESULTS CDKiA was clinically similar to androgenetic alopecia and specific vertex involvement was more common in patients treated with CDK4/6i + ET than endocrine monotherapy (n = 7 [70.0%] vs n = 4 [36.4%]; p = 0.04), respectively. After 4-6 months of minoxidil, there was a moderate to significant qualitative alopecia improvement in 80% of CDKiA patients versus 94.4% of EIA patients. Additionally, superior improvement of mean Dean Score grade was observed in EIA (with change from pre- to posttreatment - 0.44; p = 0.0002). CONCLUSION Compared to endocrine monotherapy, patients on combination CDK4/6i + ET had greater extent of vertex involvement and were more recalcitrant to minoxidil. The preferential vertex involvement observed in CDKiA suggests that combination therapy with minoxidil and topical antiandrogens with poor systemic absorption should be studied in this setting.
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Affiliation(s)
- Abena Minta
- The Ohio State University College of Medicine, Columbus, OH, USA
| | - Lucy Rose
- The Ohio State University College of Medicine, Columbus, OH, USA
| | - Candice Park
- The Ohio State University College of Medicine, Columbus, OH, USA
| | - Bhuvaneswari Ramaswamy
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Daniel Stover
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Margaret Gatti-Mays
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Mathew Cherian
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Nicole Williams
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Preeti Sudheendra
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Robert Wesolowski
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Sagar Sardesai
- Department of Medical Oncology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Maryam Lustberg
- Department of Medical Oncology, Yale Cancer Center, New Haven, CT, USA
| | | | - Kathryn J Ruddy
- Department of Medical Oncology, Mayo Clinic, Rochester, MN, USA
| | | | - Stephanie Trovato
- Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Brittany Dulmage
- Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH, USA.
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Minta A, Park C, Rose L, Trovato S, Dulmage B. Retrospective review of oral and topical minoxidil for cancer treatment-induced hair loss. Arch Dermatol Res 2023; 315:2613-2615. [PMID: 37421421 DOI: 10.1007/s00403-023-02660-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 05/25/2023] [Accepted: 06/25/2023] [Indexed: 07/10/2023]
Affiliation(s)
- Abena Minta
- Department of Dermatology, The Ohio State University Wexner Medical Center, 540 Officenter Place, Suite 240, Gahanna, OH, 43230, USA
| | - Candice Park
- Department of Dermatology, The Ohio State University Wexner Medical Center, 540 Officenter Place, Suite 240, Gahanna, OH, 43230, USA
| | - Lucy Rose
- Department of Dermatology, The Ohio State University Wexner Medical Center, 540 Officenter Place, Suite 240, Gahanna, OH, 43230, USA
| | - Stephanie Trovato
- Department of Dermatology, The Ohio State University Wexner Medical Center, 540 Officenter Place, Suite 240, Gahanna, OH, 43230, USA
| | - Brittany Dulmage
- Department of Dermatology, The Ohio State University Wexner Medical Center, 540 Officenter Place, Suite 240, Gahanna, OH, 43230, USA.
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Kovalchin CE, Kaffenberger J, Trinidad J, Gilkey TW, Minta A, Gudjonsson J, Kaffenberger BH. Characterizing risk factors for hospitalization for psoriasis patients. Arch Dermatol Res 2023; 315:1541-1546. [PMID: 36662322 DOI: 10.1007/s00403-023-02533-5] [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: 06/01/2022] [Revised: 12/08/2022] [Accepted: 01/10/2023] [Indexed: 01/21/2023]
Abstract
Psoriasis is a chronic autoimmune disease with a large economic impact. Inpatient care is a significant expense, and about one-third of patients admitted for psoriasis are readmitted. Reducing hospitalizations and readmissions is an important goal for improving outcomes for psoriasis patients. The objective of this study is to characterize patients who are hospitalized for psoriasis, and differentiate features for patients with a single hospitalization from those who were hospitalized multiple times during the study period. Hospitalized psoriasis patients were identified from an in-patient database at a single academic institution. Differences between psoriasis patients with one hospitalization and those with multiple hospitalizations were characterized, as were differences between patients who were hospitalized primarily for psoriasis and those who were admitted primarily for other reasons. Patients who were primarily hospitalized for psoriasis had fewer comorbidities, shorter hospitalizations, and a lower death rate than those hospitalized for other reasons. Patients with multiple hospitalizations had more comorbidities and worse outcomes than patients with a single hospitalization. Patients who are hospitalized primarily for psoriasis are more likely to be pustular, and tend to have fewer comorbidities and better outcomes than patients with psoriasis who are hospitalized with psoriasis as a secondary diagnosis. One limitation of this study is the lack of data available to consistently quantify disease severity, such as percent of body surface area affected by psoriasis or Physician's Global Assessment score.
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Affiliation(s)
| | - Jessica Kaffenberger
- Division of Dermatology, Department of Internal Medicine, The Ohio State University Wexner Medical Center, 2012 Kenny Road, Columbus, OH, 43221, USA
| | - John Trinidad
- Division of Dermatology, Department of Internal Medicine, The Ohio State University Wexner Medical Center, 2012 Kenny Road, Columbus, OH, 43221, USA
| | - Ty W Gilkey
- The Ohio State University College of Medicine, Columbus, OH, USA
| | - Abena Minta
- The Ohio State University College of Medicine, Columbus, OH, USA
| | - Johann Gudjonsson
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Benjamin H Kaffenberger
- Division of Dermatology, Department of Internal Medicine, The Ohio State University Wexner Medical Center, 2012 Kenny Road, Columbus, OH, 43221, USA.
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Minta A, Rose L, Zaramo T, Mital R, Dulmage B. Cross-sectional analysis of dermatology residency program social media content. Clin Dermatol 2023; 41:432-433. [PMID: 37536573 DOI: 10.1016/j.clindermatol.2023.07.012] [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: 08/05/2023]
Affiliation(s)
- Abena Minta
- Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Lucy Rose
- Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Taborah Zaramo
- Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Rohan Mital
- Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Brittany Dulmage
- Department of Dermatology, Ohio State University Wexner Medical Center, Columbus, Ohio, USA.
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Mital R, Gray A, Minta A, Almhana F, Amin S, Hydol-Smith J, Mallela T, Kaffenberger BH. Novel and Off-Label Biologic Use in the Management of Hidradenitis Suppurativa, Pyoderma Gangrenosum, Lichen Planus, and Seborrheic Dermatitis: A Narrative Review. Dermatol Ther (Heidelb) 2022; 13:77-94. [PMID: 36434425 PMCID: PMC9823183 DOI: 10.1007/s13555-022-00860-5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 11/08/2022] [Indexed: 11/26/2022] Open
Abstract
With advances in drug development and our understanding of the pathophysiology of skin disease, biologic medications have emerged as powerful management tools for dermatologists. While biologics have most often been used in the management of psoriasis, they are being used off-label for the management of a variety of other immune-mediated skin diseases with overlapping molecular targets. This narrative review focuses on the novel and off-label use of biologic medications for the management of hidradenitis suppurativa (HS), pyoderma gangrenosum (PG), lichen planus (LP), and seborrheic dermatitis (SD). Review of the literature revealed that IL-17, IL-23, and tumor necrosis factor (TNF) inhibitors were being used across a variety of immune-mediated skin pathologies with variable efficacy, among other targeted biologics. While biologics were generally safe in the treatment of primary immune-mediated skin disorders, paradoxical disease eruptions were noted with biologic use and were theorized to occur owing to immune dysregulation and cytokine imbalance. While numerous case reports show promise for the use of biologics in immune-mediated skin pathologies, the variable efficacy and safety reported warrants more thorough investigations of the role of these targeted medications in comprehensive disease management.
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Affiliation(s)
- Rohan Mital
- grid.412332.50000 0001 1545 0811Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH USA ,grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Ashley Gray
- grid.412332.50000 0001 1545 0811Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH USA ,grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Abena Minta
- grid.412332.50000 0001 1545 0811Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH USA ,grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Farah Almhana
- grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Sabrina Amin
- grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Jourdan Hydol-Smith
- grid.264756.40000 0004 4687 2082School of Medicine, Texas A&M University, College Station, TX USA
| | - Teja Mallela
- grid.261331.40000 0001 2285 7943College of Medicine, The Ohio State University, Columbus, OH USA
| | - Benjamin H. Kaffenberger
- grid.412332.50000 0001 1545 0811Department of Dermatology, The Ohio State University Wexner Medical Center, Columbus, OH USA
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Gilkey T, Trinidad J, Kovalchin C, Minta A, Rosenbach M, Kaffenberger BH. Defining Drugs that are High-Risk Associations for Drug Reactions Within the Hospital Setting. J Clin Aesthet Dermatol 2022; 15:59-64. [PMID: 35783567 PMCID: PMC9239122] [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] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVE We sought to evaluate medication exposures during an entire hospitalization, with the goal of describing medications and demographic conditions that are associated with developing a drug eruption during hospitalization. METHODS 468 patients that developed a cutaneous drug eruption were identified from a cohort of 18,140 unique inpatients with dermatologic diagnoses; medication lists and demographic information were assimilated, and drug eruption frequency tables were created. RESULTS The agents most commonly associated with drug eruptions included many antineoplastic, antifungal, and antibiotic therapeutics: idarubicin (27.78% reaction rate), daunorubicin (26.43%), sorafenib (25.00%), lenalidomide (23.53%), all-trans-retinoic acid (22.58%), decitabine (21.57%), aztreonam (15.15%), posaconazole (14.29%), and voriconazole (13.78%) among many others. Patients diagnosed with drug eruptions were more likely to have private insurance (3.29% vs. 2.58% reaction rate) and were on average older (56.7 vs. 52.6 years), had longer inpatient stay (14.2 vs. 7.9 days), and higher inpatient mortality (5.95% vs. 2.58%) than patients without eruptions. LIMITATIONS This was a single-center cross-sectional study. Drug reaction codes were used substantially less frequently than more general codes for non-specific eruptions, further, the analysis was stratified by full hospitalization data to account for delayed reactions. CONCLUSION Hospitalizations in which patients receive medications common to malignancies, such as cytotoxic and antifungal therapies represent the highest risk hospitalizations for the development of drug eruptions. When diagnosing and treating drug eruptions, clinicians should consider these medication classes with a high index of suspicion.
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Affiliation(s)
- Ty Gilkey
- Mr. Gilkey, Ms. Kovalchin, and Ms. Minta are with the Medical Student Research Program at The Ohio State College of Medicine in Columbus, Ohio
| | - John Trinidad
- Drs. Kaffenberger and Trinidad are with the Department of Internal Medicine in the Division of Dermatology at The Ohio State University Wexner Medical Center in Columbus, Ohio
| | - Claire Kovalchin
- Mr. Gilkey, Ms. Kovalchin, and Ms. Minta are with the Medical Student Research Program at The Ohio State College of Medicine in Columbus, Ohio
| | - Abena Minta
- Mr. Gilkey, Ms. Kovalchin, and Ms. Minta are with the Medical Student Research Program at The Ohio State College of Medicine in Columbus, Ohio
| | - Misha Rosenbach
- Dr. Rosenbach is with the Department of Dermatology at the University of Pennsylvania in Philadelphia, Pennsylvania
| | - Benjamin H. Kaffenberger
- Drs. Kaffenberger and Trinidad are with the Department of Internal Medicine in the Division of Dermatology at The Ohio State University Wexner Medical Center in Columbus, Ohio
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Gilkey T, Trinidad J, Kovalchin C, Minta A, Rosenbach M, Kaffenberger B. 482 Defining drugs that are high-risk associations for drug reactions within the hospital setting. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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11
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Loman BR, Shrestha CL, Kotha K, Minta A, Zhang S, Mejias A, Bailey MT, Creary S, Kopp BT. Upper airway microbiome changes in children with sickle cell disease during vaso-occlusive and acute chest syndrome episodes. Am J Hematol 2020; 95:E289-E292. [PMID: 32644239 DOI: 10.1002/ajh.25931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/02/2020] [Accepted: 07/06/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Brett R Loman
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Chandra L Shrestha
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Kavitha Kotha
- Division of Pulmonary Medicine, Nationwide Children's Hospital, Columbus, Ohio
| | - Abena Minta
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Shuzhong Zhang
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Asuncion Mejias
- Center for Vaccines and Immunity, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Michael T Bailey
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
| | - Susan Creary
- Center for Innovation in Pediatric Practice, The Abigail Wexner Research Institute, Columbus, Ohio
- Division of Hematology/Oncology/BMT, Nationwide Children's Hospital, Columbus, Ohio
| | - Benjamin T Kopp
- Center for Microbial Pathogenesis, The Abigail Wexner Research Institute, Columbus, Ohio
- Division of Pulmonary Medicine, Nationwide Children's Hospital, Columbus, Ohio
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13
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Abstract
Some glutamatergic synapses in the mammalian central nervous system exhibit high levels of free ionic zinc in their synaptic vesicles. The precise role of this vesicular zinc remains obscure, despite suggestive evidence for zinc as a neuromodulator. As a step towards elucidating the role of free zinc in the brain we have developed a method for imaging zinc release in live brain slices. A newly synthesized zinc-sensitive fluorescent probe, N-(6-methoxy-8-quinolyl)-p-carboxybenzoylsulphonamide (TFLZn), was used to monitor intracellular zinc in live rat hippocampal slices. The dye loaded into the zinc-rich synaptic vesicles of the mossy fibre terminals in the hippocampal formation. Direct electrical stimulation of the mossy fibre pathway diminished the fluorescence in the mossy fibre terminals, consistent with a stimulus-dependent zinc release. The synaptic release of zinc was followed by the rapid replenishment of the zinc levels in vesicles from an as yet unidentified intracellular zinc source. Furthermore, we present evidence that zinc may play a role in a form of long-term potentiation exhibited by the mossy fibre pathway.
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Affiliation(s)
- T Budde
- Department of Biological Sciences, University of Iowa, Iowa City 52242, U.S.A
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14
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Abstract
(Ca2+)-sensitive processes at cell membranes involved in contraction, secretion, and neurotransmitter release are activated in situ or in vitro by Ca2+ concentrations ([Ca2+]) 10-100 times higher than [Ca2+] measured during stimulation in intact cells. This paradox might be explained if the local [Ca2+] at the cell membrane is very different from that in the rest of the cell. Soluble Ca2+ indicators, which indicate spatially averaged cytoplasmic [Ca2+], cannot resolve these localized, near-membrane [Ca2+] signals. FFP18, the newest Ca2+ indicator designed to selectively monitor near-membrane [Ca2+], has a lower Ca2+ affinity and is more water soluble than previously used membrane-associating Ca2+ indicators. Images of the intracellular distribution of FFP18 show that >65% is located on or near the plasma membrane. [Ca2+] transients recorded using FFP18 during membrane depolarization-induced Ca2+ influx show that near-membrane [Ca2+] rises faster and reaches micromolar levels at early times when the cytoplasmic [Ca2+], recorded using fura-2, has risen to only a few hundred nanomolar. High-speed series of digital images of [Ca2+] show that near-membrane [Ca2+], reported by FFP18, rises within 20 msec, peaks at 50-100 msec, and then declines. [Ca2+] reported by fura-2 rose slowly and continuously throughout the time images were acquired. The existence of these large, rapid increases in [Ca2+] directly beneath the surface membrane may explain how numerous (Ca2+)-sensitive membrane processes are activated at times when bulk cytoplasmic [Ca2+] changes are too small to activate them.
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Affiliation(s)
- E F Etter
- Department of Physiology and Biomedical Imaging Group, University of Massachusetts Medical Center, Worcester, 01605, USA
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Abstract
A new family of fluorescent calcium indicators has been developed based on a new analog of BAPTA called FF6. This new BAPTA analog serves as a versatile synthetic intermediate for developing Ca2+ indicators targeted to specific intracellular environments. Two of these new Ca2+ indicators, fura-PE3 and fura-FFP18, are described in this report. Fura-PE3 is a zwitterionic indicator that resists the rapid leakage and compartmentalization seen with fura-2 and other polycarboxylate calcium indicators. In contrast to results obtained with fura-2, cells loaded with PE3 remain brightly loaded and responsive to changes in concentration of cytosolic free calcium for hours. Fura-FFP18 is an amphipathic indicator that to binds to liposomes and to cell membranes. Studies to be detailed later indicate that FFP18 functions as a near-membrane Ca2+ indicator and that calcium levels near the plasma membrane rise faster and higher than in the cytosol.
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Affiliation(s)
- C Vorndran
- Department of Zoology, University of Texas at Austin 78712-1064, USA
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16
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Martin RJ, Kusel JR, Robertson SJ, Minta A, Haugland RP. Distribution of a fluorescent ivermectin probe, bodipy ivermectin, in tissues of the nematode parasite Ascaris suum. Parasitol Res 1992; 78:341-8. [PMID: 1409535 DOI: 10.1007/bf00937094] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A fluorescent derivative of the anthelmintic ivermectin (4''-5,7-dimethyl bodipy proprionylivermectin, referred to hereafter as bodipy ivermectin) was synthesized for an investigation of the distribution of avermectins. Injected into adult Ascaris suum at doses greater than 0.1 micron per worm, it produced a dose-dependent immobilization. Fluorescent microscopy of frozen sections revealed the distribution of the probe in the whole nematode. Staining of collagenase-isolated muscle cells was studied using bath application of bodipy ivermectin. The trypan-blue quenching technique showed that the ivermectin probe was located in the outer monolayer of the muscle membrane. The cytoplasm was not stained. The interpretation of these observations is discussed in view of the known lipophilic nature of avermectins. Staining of the muscle membrane and nerve cord is consistent with the view that avermectins act at these sites. The significance of the hypodermal and lateral line staining is also discussed.
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Affiliation(s)
- R J Martin
- Department of Preclinical Veterinary Sciences, University of Edinburgh, UK
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Minta A, Tsien RY. Fluorescent indicators for cytosolic sodium. J Biol Chem 1989; 264:19449-57. [PMID: 2808435] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Fluorescent indicators sensitive to cytosolic concentrations of free Na+ have been synthesized and characterized. They consist of a crown ether, 1,7-diaza-4,10,13-trioxacyclopentadecane, linked via its nitrogens to fluorophores bearing additional liganding centers. In the currently preferred dye, SBFI (short for sodium-binding benzofuran isophthalate), the fluorophores are benzofurans linked to isophthalate groups. Selectivities for Na+ over K+ of about 20 are observed, resulting in effective dissociation constants for Na+ of about 20 mM against a background of 120 mM K+. Increasing [Na+] increases the ratio of excitation efficiency at 330-345 nm to that at 370-390 nm with emission collected at 450-550 nm, so that ratio fluorometry and imaging can be performed with the same wavelengths as used with the well known Ca2+ indicator fura-2. If the macrocyclic ring is increased in size to a 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane, the chelators become selective for K+ over Na+.
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Affiliation(s)
- A Minta
- Department of Physiology-Anatomy, University of California, Berkeley 94720
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Minta A, Kao JP, Tsien RY. Fluorescent indicators for cytosolic calcium based on rhodamine and fluorescein chromophores. J Biol Chem 1989; 264:8171-8. [PMID: 2498308] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A new group of fluorescent indicators with visible excitation and emission wavelengths has been synthesized for measurements of cytosolic free Ca2+. The five compounds, "rhod-1," "rhod-2," "fluo-1," "fluo-2," and "fluo-3" (Figs. 2 and 3), combine the 8-coordinate tetracarboxylate chelating site of 1,2-bis(2-amino-phenoxyethane-N,N,N',N'-tetraacetic acid with a xanthene chromophore to give a rhodamine-like or fluorescein-like fluorophore. Binding of Ca2+ increases the fluorescence by up to 40-fold. The Ca2+ dissociation constants are in the range 0.37-2.3 microM, so that the new indicators should give better resolution of high [Ca2+] levels than previously obtainable with quin-2 or fura-2. The visible excitation wavelengths of the new compounds are more convenient for fluorescence microscopy and flow cytometry than the UV required by previous indicators. However, the new dyes' increase in fluorescence upon binding calcium is not accompanied by a wavelength shift, so they are unsuitable for measurements using ratios at two wavelengths. The most promising dye of this series is fluo-3, whose initial biological testing in fibroblasts is described in the following paper (Kao, J. P. Y., Harootunian, A. T., and Tsien, R. Y. (1989) J. Biol. Chem. 264, 8171-8178).
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Affiliation(s)
- A Minta
- Department of Physiology-Anatomy, University of California, Berkeley 94720
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Minta A, Minta P, Kochański W. [Effect of radon 222 on the oral mucosa of rabbits]. Czas Stomatol 1975; 28:615-21. [PMID: 1055669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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