title: Candidate biomarkers for deep tissue damage from molecular biological and biochemical aspects.
abstract: Suspected deep tissue injury (DTI) is a new category of pressure ulcer (PU), and defined as an ulcer that developed from a deep tissue (subcutaneous tissue) region and deteriorates towards the superficial skin. DTI is a serious clinical problem because it cannot be detected at an early stage and rapidly deteriorates to a deep PU. Consequently, there is a requirement for the identification of novel biomarkers to detect damage to the deep tissue including deep muscle tissue. For this purpose, it is essential to understand the molecular and cellular mechanisms of DTI formation and deterioration. This article reviews the recent progress in studies on the hypoxia-related mechanisms of DTI, and introduces our attempts to establish novel biomarkers for detecting deep muscle damage. Hypoxia-inducible factor 1 alpha subunit (HIF1-alpha) is a widely used marker for hypoxic conditions. We detected increased expression and localization of HIF1-alpha in the deep muscle tissue of PU model rats, indicating that HIF1alpha is a key molecule in DTI and a valuable biomarker for hypoxia in DTI in the research field. From the biochemical aspect, we focused on creatine phosphokinase (CPK). CPK is an intracellular enzyme related to energy metabolism, and its level in serum has been extensively used as a diagnostic marker for muscle injury. We attempted to estimate muscle injury from the CPK levels in exudates, which can be collected non-invasively and reflect the microenvironmental conditions. Our results using PU model rats suggested that exudate CPK could be a more sensitive biomarker than serum CPK for deep muscle tissue injury, and could be applicable for clinical diagnosis of DTI.
authors.affiliation: Department of Advanced Skin Care, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-0033, Japan.
authors.forename: Takeo
authors.initials: T
authors.lastname: Minematsu
authors.forename: Gojiro
authors.initials: G
authors.lastname: Nakagami
authors.forename: Yunita
authors.initials: Y
authors.lastname: Sari
authors.forename: Tomoko
authors.initials: T
authors.lastname: Akase
authors.forename: Junko
authors.initials: J
authors.lastname: Sugama
authors.forename: Takashi
authors.initials: T
authors.lastname: Nagase
authors.forename: Hiromi
authors.initials: H
authors.lastname: Sanada
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D003402:Creatine Kinase / Q000097:blood / Q000378:metabolism*; D005122:Exudates and Transudates / Q000378:metabolism; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000097:blood / Q000378:metabolism*; D003668:Pressure Ulcer / Q000378:metabolism* / Q000473:pathology; D051381:Rats; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D003402:Creatine Kinase