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on-healing wounds continue to be a clinical challenge for patients and medical staff.
These wounds have a heterogeneous etiology, including diabetes and surgical trauma wounds. It is
therefore important to decipher molecular signatures that reflect the macroscopic process of wound
healing. To this end, we collected wound sponge dressings routinely used in vacuum assisted therapy
after surgical trauma to generate wound-derived protein profiles via global mass spectrometry.
We confidently identified 311 proteins in exudates. Among them were expected targets belonging to
the immunoglobulin superfamily, complement, and skin-derived proteins, such as keratins. Next to
several S100 proteins, chaperones, heat shock proteins, and immune modulators, the exudates
presented a number of redox proteins as well as a discrete neutrophil proteomic signature, including
for example cathepsin G, elastase, myeloperoxidase, CD66c, and lipocalin 2. We mapped over 200
post-translational modifications (PTMs; cysteine/methionine oxidation, tyrosine nitration, cysteine
trioxidation) to the proteomic profile, for example, in peroxiredoxin 1. Investigating manually
collected exudates, we confirmed presence of neutrophils and their products, such as microparticles
and fragments containing myeloperoxidase and DNA. These data confirmed known and identified
less known wound proteins and their PTMs, which may serve as resource for future studies on
human wound healing
Biocidal Agents Used for Disinfection Can Enhance Antibiotic Resistance in Gram-Negative Species
(2018)
Climate Change-Induced Shift of Tree Growth Sensitivity at a Central Himalayan Treeline Ecotone
(2018)
: An enhanced indoleamine 2,3-dioxygenase 1 (IDO1) activity is associated with an increased
mortality risk in sepsis patients. Thus, the preventive inhibition of IDO1 activity may be
a promising strategy to attenuate the severity of septic shock. 1-methyltryptophan (1-MT)
is currently in the interest of research due to its potential inhibitory effects on IDO1 and
immunomodulatory properties. The present study aims to investigate the protective and
immunomodulatory effects of 1-methyltryptophan against endotoxin-induced shock in a porcine
in vivo model. Effects of 1-MT were determined on lipopolysaccharide (LPS)-induced tryptophan
(TRP) degradation, immune response and sickness behaviour. 1-MT increased TRP and its metabolite
kynurenic acid (KYNA) in plasma and tissues, suppressed the LPS-induced maturation of neutrophils
and increased inactivity of the animals. 1-MT did not inhibit the LPS-induced degradation of TRP
to kynurenine (KYN)—a marker for IDO1 activity—although the increase in KYNA indicates that
degradation to one branch of the KYN pathway is facilitated. In conclusion, our findings provide
no evidence for IDO1 inhibition but reveal the side effects of 1-MT that may result from the proven
interference of KYNA and 1-MT with aryl hydrocarbon receptor signalling. These effects should be
considered for therapeutic applications of 1-MT.
The platinum(II) complexes carboplatin (CBDCA), cisplatin (CDDP) and oxaliplatin
(1-OHP) are used as anticancer drugs in a large number of tumour chemotherapy regimens.
Many attempts have been made to combine Pt(II)-based chemotherapy with alternative treatment
strategies. One such alternative anticancer approach is known as photodynamic therapy (PDT),
where a non-toxic photosensitizer (PS) produces oxidative stress via the formation of reactive
oxygen species (ROS) after local illumination of the affected tissue. A very promising PS is
5,10,15,20-tetra(m-hydroxyphenyl)chlorin (mTHPC, Temoporfin), which is approved for the treatment
of head and neck cancer in Europe. In the present study, a combination of mTHPC-mediated PDT
and either CBDCA, CDDP, or 1-OHP was applied to five human cancer cell lines from different
tumour origins. Cytotoxicity was determined by the MTT assay and synergistic effects on cytotoxicity
were evaluated by calculation of Combination Indices (CI). Synergy was identified in some of the
combinations, for example, with 1-OHP in three of the tested cell lines but antagonism was also
observed for a number of combinations in certain cell lines. In cases of synergy, elevated ROS levels
were observed after combination but apoptosis induction was not necessarily increased compared
to a treatment with a single compound. Cell cycle analysis revealed a formation of apoptotic
subG1 populations and S phase as well as G2/M phase arrests after combination. In conclusion,
pre-treatment with mTHPC-PDT has the potential to sensitize some types of tumour cells towards
Pt(II) complexes, in particular 1-OHP but synergy is highly dependent on the type of cancer.