Comparison of systemic inflammatory and hematology parameters in normal C57BI/6 and genetically diabetic db/db mice during local wound repair

Uvod: Upala je početni odgovor domaćina na ozljedu. Ona nije ograničena samo na mjesto rane, nego izaziva sustavne promjene uključujući raznovrsne fiziološke i biokemijske promjene koje se skupno nazivaju odgovorom akutne faze. Ove se promjene nastavljaju tijekom rješavanja upale i procesa cijeljenja rane. U ovom ispitivanju smo usporedili serumski amiloid A protein (SAA), hematološke parametre (ukupna bijela krvna slika, postotak neutrofila i lim-focita) te koncentracije interferona-gama (IFN-γ) u serumu tijekom cijeljenja neokludirane, ekscizijske kožne rane u punoj debljini kod genetski dijabetičnih db/db miševa i nedijabetičnih C57Bl/6 miševa iz istoga legla. Materijal i metode: Područje rane izazvane „punch" biopsijom (promjera 8 mm) kod svakog je miša analizirano planimetrijski uz računalnu potporu. Trećeg, 6., 9. i 13. dana od ranjavanja SAA i IFN-g mjereni su u plazmi testovima ELISA, a hematološki parametri u punoj krvi na automatskom hematološkom analizatoru Sysmex SF 3000. Rezultati: Šestog i devetog dana jasno je zabilježeno kašnjenje u zatvaranju rane kod db/db miševa u usporedbi sa zdravim miševima. Ukupna bijela krvna slika bila je značajno viša u db/db miševa 9. i 13. dana. Kroz čitavo razdoblje obnove rane, diferencijalni broj neutrofila bio je viši, a broj limfocita niži kod db/db miševa u usporedbi s C57Bl/6 miševima. Vršne koncentracije SAA zabilježene su 3. dana kod C57Bl/6 miševa i db/db miševa (368,7 mg/L odnosno 173,5 mg/L), s težnjom prema nižim vrijednostima kod db/db miševa. Razine IFN-γ bile su značajno više (P < 0,05) 9. i 13. dana kod db/db miševa (75,3 pg/mLodnosno 89,9 pg/mL) u usporedbi s razinama kod C57Bl/6 miševa (66,6 pg/mL odnosno 57,2 pg/mL). Zaljučak: Lokalni proces tkivne regeneracije kod miševa nakon lokalne kožne ozljede uzrokuje sustavne promjene u perifernoj krvi. Niti određivanje koncentracije SAA niti IFN-γ nije se moglo rabiti za motrenje dinamike cijeljenja rane u ovim vremenskim točkama.Introduction: Inflammation is the initial host response to injury. It is not only localized to the wound site but also causes systemic changes, including a variety of physiological and biochemical changes collectively called the acute phase response. These changes continue during the resolution of inflammation and the wound healing process. In this study we compared serum amyloid A protein (SAA), hematological parameters (total white blood cell count, neutrophil and lymphocyte percentage) and interferon-gamma (IFN-γ) concentrations in serum during healing of non-occluded, excisional, full-thickness dermal wounds in genetically diabetic db/db mice and non-diabetic C57Bl/6 littermates. Materials and Methods: Area of a punch biopsy (8 mm in diameter) wound in each mouse was analyzed by computer-assisted planimetry. On days 3,6, 9 and 13 after wounding, SAA and IFN-γ were measured in plasma by ELISA assays and hematological parameters in whole blood by SysmexSF 3000 automatic hematology analyzer. Results: A delay in the closure of wounds in db/db in comparison to normal mice was clearly seen on days 6 and 9. Total white blood cell count was significantly higher on days 9 and 13 in db/db mice. Differential neutrophil counts were higher and lymphocyte counts lower in db/db mice in comparison to C57BL/6 mice throughout the wound repair period. Peak SAA concentrations were seen on day 3 in C57Bl/6 and db/db mice (368.7 mg/L and 173.5 mg/L, respectively), but tended to be lower in db/db mice. IFN-γ levels were significantly higher (P < 0.05) on days 9 and 13 in db/db (75.3 pg/mL and 89.9 pg/mL, respectively) in comparison to those in C57Bl/6 mice (66.6 pg/mL and 57.2 pg/mL, respectively). Conclusion. The local tissue regeneration process in mice after local skin injury causes systemic changes in peripheral blood. Determination of neither SAA nor IFN-γ concentrations could be used to monitor wound healing dynamics at these time points