Old Mice Demonstrate Organ Dysfunction as well as Prolonged Inflammation, Immunosuppression, and Weight Loss in a Modified Surgical Sepsis Model.

Abstract:

OBJECTIVES:Our goal was to "reverse translate" the human response to surgical sepsis into the mouse by modifying a widely adopted murine intra-abdominal sepsis model to engender a phenotype that conforms to current sepsis definitions and follows the most recent expert recommendations for animal preclinical sepsis research. Furthermore, we aimed to create a model that allows the study of aging on the long-term host response to sepsis. DESIGN:Experimental study. SETTING:Research laboratory. SUBJECTS:Young (3-5 mo) and old (18-22 mo) C57BL/6j mice. INTERVENTIONS:Mice received no intervention or were subjected to polymicrobial sepsis with cecal ligation and puncture followed by fluid resuscitation, analgesia, and antibiotics. Subsets of mice received daily chronic stress after cecal ligation and puncture for 14 days. Additionally, modifications were made to ensure that "Minimum Quality Threshold in Pre-Clinical Sepsis Studies" recommendations were followed. MEASUREMENTS AND MAIN RESULTS:Old mice exhibited increased mortality following both cecal ligation and puncture and cecal ligation and puncture + daily chronic stress when compared with young mice. Old mice developed marked hepatic and/or renal dysfunction, supported by elevations in plasma aspartate aminotransferase, blood urea nitrogen, and creatinine, 8 and 24 hours following cecal ligation and puncture. Similar to human sepsis, old mice demonstrated low-grade systemic inflammation 14 days after cecal ligation and puncture + daily chronic stress and evidence of immunosuppression, as determined by increased serum concentrations of multiple pro- and anti-inflammatory cytokines and chemokines when compared with young septic mice. In addition, old mice demonstrated expansion of myeloid-derived suppressor cell populations and sustained weight loss following cecal ligation and puncture + daily chronic stress, again similar to the human condition. CONCLUSIONS:The results indicate that this murine cecal ligation and puncture + daily chronic stress model of surgical sepsis in old mice adhered to current Minimum Quality Threshold in Pre-Clinical Sepsis Studies guidelines and met Sepsis-3 criteria. In addition, it effectively created a state of persistent inflammation, immunosuppression, and weight loss, thought to be a key aspect of chronic sepsis pathobiology and increasingly more prevalent after human sepsis.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Stortz JA,Hollen MK,Nacionales DC,Horiguchi H,Ungaro R,Dirain ML,Wang Z,Wu Q,Wu KK,Kumar A,Foster TC,Stewart BD,Ross JA,Segal M,Bihorac A,Brakenridge S,Moore FA,Wohlgemuth SE,Leeuwenburgh C,Mohr AM,Moldawer LL,E

doi

10.1097/CCM.0000000000003926

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

e919-e929

issue

11

eissn

0090-3493

issn

1530-0293

journal_volume

47

pub_type

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