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Papers of the Week

Papers: 7 Jan 2023 - 13 Jan 2023

Animal Studies, Pharmacology/Drug Development

2023 Jan 03

Int J Mol Sci



Dihydroceramides Derived from Bacteroidetes Species Sensitize TRPV1 Channels.


Ludwig N, Demaree IS, Yamada C, Nusbaum A, Nichols FC, White FA, Movila A, Obukhov AG
Int J Mol Sci. 2023 Jan 03; 24(1).
PMID: 36614317.


Bacterial colonization of open wounds is common, and patients with infected wounds often report significantly elevated pain sensitivity at the wound site. Transient Receptor Potential Vanilloid Type 1 (TRPV1) channels are known to play an important role in pain signaling and may be sensitized under pro-inflammatory conditions. Bacterial membrane components, such as phosphoethanolamine dihydroceramide (PEDHC), phosphoglycerol dihydroceramide (PGDHC), and lipopolysaccharide (LPS), are released in the environment from the Gram-negative bacteria of the Bacteroidetes species colonizing the infected wounds. Here, we used intracellular calcium imaging and patch-clamp electrophysiology approaches to determine whether bacterially derived PEDHC, PGDHC, or LPS can modulate the activity of the TRPV1 channels heterologously expressed in HEK cells. We found that PEDHC and PGDHC can sensitize TRPV1 in a concentration-dependent manner, whereas LPS treatment does not significantly affect TRPV1 activity in HEK cells. We propose that sensitization of TRPV1 channels by Bacteroidetes-derived dihydroceramides may at least in part underlie the increased pain sensitivity associated with wound infections.