John J. Lemasters, Venkat K. Ramshesh, Gregory L

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Compartmentation of Mitochondrial and Oxidative Metabolism in Growing Hair Follicles: A Ring of Fire  John J. Lemasters, Venkat K. Ramshesh, Gregory L. Lovelace, John Lim, Graham D. Wright, Duane Harland, Thomas L. Dawson  Journal of Investigative Dermatology  Volume 137, Issue 7, Pages 1434-1444 (July 2017) DOI: 10.1016/j.jid.2017.02.983 Copyright © 2017 The Authors Terms and Conditions

Figure 1 Isolated, dissected bovine hair follicles in culture. (a) Micrographs of a growing follicle during 7 days in culture. As illustrated for day 7 of culture, hair growth was indicated by increases of the total length of the follicle (day 1), the length of the hair shaft (day 2), and the length of hair shaft protruding beyond the cut distal edge of the follicle (day 3). Horizontal black stripes are a millimeter ruler. (b) Hematoxylin and eosin staining of a typical isolated bovine follicle. Scale bar = 200 μm. (c) Growth of six follicles dissected from a single cow skin. ORS, outer root sheath. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions

Figure 2 Multiphoton imaging of cell viability, mitochondrial polarization, and secretory vesicles in growing bovine hair follicles. (a, b) Bovine hair follicle loaded with green-fluorescing Rh123 and red-fluorescing PI and imaged by multiphoton microscopy. (a) Scale bar = 50 μm. (b) Scale bar = 25 μm. Asterisk indicates nonviable cell nuclei labeled with PI. (c, d) A bovine hair follicle visualized with LTR (red, secretory vesicles) and Rh123 (green, mitochondrial ΔΨ). (c) Scale bar = 100 μm. (d) Scale bar = 25 μm. DS, dermal sheath; GMC, germative matrix cells; HM, hair matrix; LTR, LysoTracker Red; PI, propidium iodide; Rh123, rhodamine 123. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions

Figure 3 Formation of ROS in growing bovine hair follicles. (a) Bovine hair follicle visualized with TMRM (red, ΔΨ) and cmH2DCF-DA (green, ROS). Arrows identify dermal sheath cells labeled with cmH2DCF for ROS. Double arrows identify clusters of cells with high cmH2DCF and/or TMRM fluorescence at the apex of clefts (asterisk) of mitochondrial depolarization (loss of red TMRM fluorescence). Yellow granules in black areas are melanin inside the hair matrix (HM). (b) Three-dimensional projection of cmH2DCF and TMRM fluorescence. Arrows identify cells with high cmH2DCF and/or TMRM fluorescence. Scale bars = 100 μm. ΔΨ, mitochondrial membrane potential; cmH2DCF, chloromethyldihydrodichlorofluorescein; HM, hair matrix; cmH2DCF-DA, chloromethyldihydrodichlorofluorescein diacetate; ROS, reactive oxygen species; TMRM, tetramethylrhodamine methyl ester. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions

Figure 4 Mitochondrial hyperpolarization, degranulation, and formation of ROS in growing and nongrowing bovine hair follicles. (a) Dissected bovine hair follicles visualized with Rh123 (green, ΔΨ) plus LTR (red, secretory vesicles) or (b) TMRM (red, ΔΨ). Scale bar = 25 μm. Asterisk indicates hyperpolarized mitochondria. Scale bar = 50 μm. (c) Bovine hair follicle loaded with cmDCF (green, ROS) and TMRM (red, ΔΨ) and cross-sectionally imaged 100 μm distal from its base. Scale bar = 100 μm. (d) cmDCF- and TMRM-loaded nongrowing bovine hair follicle imaged from the side at 60 μm from the surface. Scale bar = 100 μm. ΔΨ, mitochondrial membrane potential; cmDCF, chloromethyldihydrodichlorofluorescein; DP, dermal papilla; DS, dermal sheath; GMC, germative matrix cells; HM, hair matrix; LTR, LysoTracker Red; Rh123, rhodamine 123; ROS, reactive oxygen species; TMRM, tetramethylrhodamine methyl ester. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions

Figure 5 Mitochondrial hyperpolarization and degranulation in plucked human hairs. (a) Human hair pluck imaged by multiphoton microscopy after loading with Rh123 and LTR. Inset shows areas of LTR-labeled vesicle (granule) formation (1), mitochondrial hyperpolarization (2), loss of vesicles (3), and mitochondrial depolarization (4). Scale bar = 100 μm. (b) Three-dimensional longitudinal projection (left) and latitudinal cross section (right) of a plucked human hair imaged with cmDCF and TMRE (red, ΔΨ) by light sheet microscopy. Arrows identify hyperpolarized and ROS-generating cells in the ring of fire. Scale bar = 200 μm. ΔΨ, mitochondrial membrane potential; cmDCF, chloromethyldihydrodichlorofluorescein; GMC, germative matrix cells; HM, hair matrix; LTR, LysoTracker Red; Rh123, rhodamine 123; TMRM, tetramethylrhodamine methyl ester. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions

Figure 6 Scheme of hair follicle metabolism in a longitudinal section of a human follicle. Mitochondrial ΔΨ increases as proliferative germative matrix cells (GMCs) move upward, culminating in a burst of ROS generation, loss of granules, and mitochondrial depolarization. Hyperpolarization and ROS generation are particularly intense in a circumferential ring of fire. Scheme is superimposed on a light-sheet image of a plucked human hair labeled with TMRE and cmH2DCF. ΔΨ, mitochondrial membrane potential; CL, companion layer; cmH2DCF, chloromethyldihydrodichlorofluorescein; DS, dermal sheath; DP, dermal papilla; GMC, germative cell matrix; HM, hair matrix; HS, hair shaft; IRS, inner root sheath; ORS, outer root sheath. Journal of Investigative Dermatology 2017 137, 1434-1444DOI: (10.1016/j.jid.2017.02.983) Copyright © 2017 The Authors Terms and Conditions