Aging Induced p53/p21 in Genioglossus Muscle Stem Cells and Enhanced Upper Airway Injury

<div>The renewal ability declined and senescence phenotype increased in aging GG. (a) Pax7, Pax7/DAPI, and enlarged Pax7/DAPI detected in GG muscles. (b) DAPI, Ki67, and Ki67/DAPI were detected in GG muscles. (c) The protein level of p53 was significantly increased in 12-month-old GG. (d) The protein level of p21 dramatically increased in 12-month-old GG compared to 1-month-old, 2-month-old, or 6-month-old. (e) Pax7-positive cells in GG significantly reduced in 12-month-old compared to 1-month-old. (f) Ki67-positive cells in GG greatly reduced in 12-month-old compared to 1-month-old. Ki67 was observed by immunofluorescence staining. (g) The mRNA levels of p53 and p21 also upregulated in aging GG. <svg height="13.532pt" id="M13" style="vertical-align:-3.4295pt" version="1.1" viewbox="-0.0498162 -10.1025 50.6052 13.532" width="50.6052pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0091,0,0,-0.0091,0,-5.741)"><path d="M486 158C486 177 478 202 466 220C413 228 386 236 336 262C386 288 413 297 466 304C478 323 486 347 485 366C470 376 444 381 422 380C389 338 368 319 321 288C323 345 329 372 349 422C339 442 322 461 305 470C289 461 271 442 262 422C281 372 287 345 290 288C243 319 222 338 189 380C167 381 142 376 125 366C125 347 133 322 145 304C198 296 225 288 275 262C225 236 198 227 145 220C133 201 125 177 126 158C141 148 167 143 189 144C222 186 243 205 290 236C288 179 282 152 262 102C272 82 289 63 306 54C322 63 340 82 350 102C330 152 324 179 321 236C368 205 390 186 422 144C444 143 470 148 486 158Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.079,0)"><path d="M570 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Stem Cells International

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Figure 2

Figure 2: Aging Induced p53/p21 in Genioglossus Muscle Stem Cells and Enhanced Upper Airway Injury 