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MALDI imaging mass spectrometry: Discrimination of pathophysiological regions in traumatized skeletal muscle by characteristic peptide signatures

Figure 2. Spatial distribution of characteristic m/z values for the traumatized, trauma adjacent, and healthy muscle regions. (A) Average peak MALDI mass spectra intensity of primary trauma (tm, red) and trauma adjacent muscle/healthy (hm, tam, blue) region. (B) HE staining of the healthy and the injured soleus muscle in the region of interest are indicated by the red (tm), black (tam), and green (hm) frame. Ion density distributions to the corresponding spectra peak intensity by using (C) supervised approach (ClinProTools) and (D) unsupervised approach (SCiLS Lab). The m/z values 976 and 1488 show significantly lower intensities (p < 0.05) in the primary trauma region (tm) compared to the trauma adjacent (tam) or healthy (hm) muscle regions. In contrast, the m/z values 985 and 1255 exhibited significantly higher intensities (p < 0.05) in the primary trauma region (tm) compared to tam and hm regions.