DOI: 10.1093/bjs/znad258.431 ISSN:

985 The Temporal Changes in the Urine of Severe Traumatic Brain Injury Patients

M Cetin
  • Surgery

Abstract

Aim

Neuroinflammation is a secondary injury mechanism that contributes to significant mortality and morbidity with severe traumatic brain injury (TBI). This study aimed to evaluate the temporal neuroinflammatory pattern of the ionised calcium-binding adaptor molecule 1 (Iba1) and transmembrane Protein 119 (TMEM119) microglia marker proteins in the urine of severe TBI patients for 7 days post-injury.

Method

Urine samples were acquired from fifteen patients with severe TBI upon hospital admission and the subsequent 7 days post-injury. Western blot analysis was used to quantify the urinary levels of Iba-1 and TMEM119 expression in each sample. The patients were stratified by functional outcomes (group 1, death- vegetative state; group 2, moderate-to- severe disability; group 3, good outcomes).

Results

Iba1 was detected in all (100%) whilst TMEM119 was detected in 65% of acquired urine samples. The mean total normalised Iba1 expression increased for group 2 whilst the opposite response was observed for groups 1 and 3. The mean total normalised TMEM119 expression decreased for group 3 whilst the opposite response was observed for groups 1 and 2. However, these findings were not statistically significant. No significant differences were found in Iba1 or TMEM119 expression between favourable and unfavourable outcome groups.

Conclusions

Overall, this study cannot associate urinary Iba1 or TMEM119 expression with functional outcomes. However, the presence and temporal patterns of the urinary microglia markers suggest it may be reflective of the underlying neuroinflammatory process and merits further studies.

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