Identifying the quality markers accelerating wound repair in
Lamiophlomis rotata by mass spectrometry imaging
Abstract
The total iridoid glycoside extract of Lamiophlomis rotata (IGLR) has
been proven to be the main pharmacological ingredient for wound healing;
however, it is still unclear, which compounds in the extract are
responsible for this effect. We developed and validated a mass
spectrometry imaging (MSI) method to reveal the relationship between
phytochemical components and the pharmacological efficacy in IGLR.
Shanzhiside methyl (SM) ester, 8-O-acetylshanzhiside methyl ester (ASM),
and Phlorigidoside C (PhC) have been identified as quality markers in
IGLR to accelerate wound healing by MSI method. As per MSI data with
UMAP manifold analysis, these compounds overlapped in the same class
with endogenous metabolites (lactate, citrate and succinate). In
addition, UPLC-Q/TOF-MSn coupled with multivariate analyses for skin
tissues in the normal and wound groups further confirmed the results.
Furthermore, MSI data from livers and kidneys revealed that SM, ASM, and
PhC absorption significantly increased, whereas their elimination rates
remarkably decreased in the injured group. Collectively, the overall
data demonstrated that SM, ASM, and PhC selectively increased in the new
granulation tissue and that the bioavailability of these three quality
markers was remarkably improved in the wound group after continuous
gavage for 7 days. This protocol can be applied to reveal the
relationship between phytochemical components and the pharmacological
efficacy of other iridoid glycoside extracts.