title: Label-free oxygen-metabolic photoacoustic microscopy in vivo.
abstract: Almost all diseases, especially cancer and diabetes, manifest abnormal oxygen metabolism. Accurately measuring the metabolic rate of oxygen (MRO(2)) can be helpful for fundamental pathophysiological studies, and even early diagnosis and treatment of disease. Current techniques either lack high resolution or rely on exogenous contrast. Here, we propose label-free metabolic photoacoustic microscopy (mPAM) with small vessel resolution to noninvasively quantify MRO(2) in vivo in absolute units. mPAM is the unique modality for simultaneously imaging all five anatomical, chemical, and fluid-dynamic parameters required for such quantification: tissue volume, vessel cross-section, concentration of hemoglobin, oxygen saturation of hemoglobin, and blood flow speed. Hyperthermia, cryotherapy, melanoma, and glioblastoma were longitudinally imaged in vivo. Counterintuitively, increased MRO(2) does not necessarily cause hypoxia or increase oxygen extraction. In fact, early-stage cancer was found to be hyperoxic despite hypermetabolism.
authors.affiliation: Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, USA.
authors.forename: Junjie
authors.initials: J
authors.lastname: Yao
authors.forename: Konstantin I
authors.initials: KI
authors.lastname: Maslov
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
authors.forename: Lihong V
authors.initials: LV
authors.lastname: Wang
mesh_terms: D000818:Animals; D001783:Blood Flow Velocity; D045744:Cell Line, Tumor; D005334:Fever / Q000378:metabolism; D005909:Glioblastoma / Q000098:blood supply / Q000378:metabolism; D006439:Hemodynamics; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D006947:Hyperkalemia / Q000151:congenital; D008297:Male; D008546:Melanoma, Experimental / Q000098:blood supply / Q000378:metabolism; D051379:Mice; D008819:Mice, Nude; D033401:Microscopy, Acoustic / Q000295:instrumentation / Q000379:methods*; D055806:Microvessels / Q000378:metabolism; D009368:Neoplasm Transplantation; D010100:Oxygen / Q000097:blood / Q000378:metabolism*
chemical_list: D006454:Hemoglobins; D010100:Oxygen