Can indoor dampness support mold growth and trichothecene exposure that may affect mitochondria and oxidative stress?

Indoor dampness is a well-established environmental condition that promotes mould growth. The broader claim is biologically credible: certain trichothecene-producing moulds in water-damaged buildings may create opportunities for exposure, and trichothecenes can affect mitochondrial and oxidative-stress pathways in experimental systems. However, environmental detection does not by itself demonstrate a clinically meaningful internal dose in occupants.

Indoor environment and exposure

• Excess moisture from leaks, flooding, condensation, high humidity, or wet building materials supports mould growth. Damp materials can release fungal spores, cells, and fragments into indoor air.
• Trichothecenes have been detected in some water-damaged-building materials, settled dust, and occasionally air. In one Belgian survey of seven water-damaged buildings, roridin E was detected in 3 air samples.
• This establishes a plausible exposure route, but detection in dust or limited air samples is not equivalent to inhaled dose or trichothecene-related illness in residents.

Mechanistic and toxicological findings

• Several trichothecenes can disrupt mitochondrial biology. T-2 toxin, diacetoxyscirpenol, and trichothecin inhibited mitochondrial translation in yeast; at greater exposure, membrane potential declined and mitochondrial morphology changed.
• Macrocyclic trichothecenes mytoxin B and epiroridin acid reduced mitochondrial membrane potential in HepG-2 cells. Satratoxin G caused cytochrome-c release, caspase-9 activation, and apoptosis in human HL-60 cells, consistent with mitochondrial-pathway apoptosis; apoptosis was also reported in THP-1 cells.
• T-2 toxin and deoxynivalenol increased reactive oxygen species and malondialdehyde (lipid peroxidation) and altered/depleted glutathione. In human cervical cancer cells, T-2 increased ROS and MDA while lowering GSH and increasing oxidative DNA damage over time.

Bottom line

• Dampness reliably supports indoor mould growth; trichothecene exposure from damp-building mould is plausible but variable. Experimental evidence supports mitochondrial dysfunction, apoptosis, and oxidative stress from some trichothecenes, yet these findings do not establish the magnitude or clinical significance of effects at typical indoor human exposures.