Research Blog

Blood Biomarkers for Mold Exposure

Overview

Mold is a type of fungus suspected of causing illness in humans, including asthma, allergic fungal sinusitis, bronchopulmonary aspergillosis (affecting those with asthma and cystic fibrosis), and hypersensitivity pneumonitis (HP), which is less common. Adverse reactions to mold exposure may be due to direct infection with the microorganism, allergic/hypersensitivity immune response generated by the host, and/or exposure to toxic mold byproducts (Bush 2006).

Mold may not be visible until sporulation at which time colorful spores can be detected, e.g., blue/green (Penicilliums), red (Aspergillus, Fusarium, and Rhodotorula), grey (Botrytis), and black (Stachybotrys). Mycotoxins produced by mold and absorbed through the nose, lungs, and skin, can also cause adverse reactions. An estimated 15% of the workforce, as well as 15% of school children may be affected by mold exposure. However, symptoms and adverse effects depend on the intensity of exposure, individual medical history, physiological and psychological stress factors, and nutritional status, especially vitamin D insufficiency (Theoharides 2018).

Phenomena such as chronic inflammatory response syndrome (CIRS) and dampness and mold hypersensitivity syndrome (DMHS) have been associated with mold exposure. They are characterized by innate and adaptive immune responses, a pro-inflammatory state, and multiorgan symptoms (Daschner 2017).

Mold exposure is suspected of contributing to sick-building syndrome (SBS) and related health issues, including skin, mucosal, and general symptomatology. These symptoms, in turn, are associated with clinical biomarkers of inflammation and allergy, including elevated C-reactive protein (CRP), eosinophil counts, and immunoglobulin E (IgE) (Sahlberg 2012).

 

Estimates of evidence for a causal relationship between dampness/mold exposure and disease. Whereas detection of IgE is used as a biomarker in allergic airway disease and belongs to the highest evidence in dampness and mold hypersensitivity syndrome (DMHS), extra-respiratory symptoms are less consistent when analyzed in different epidemiologic studies. PFT, Pulmonary function testing; MMT, Mixed mold mycotoxicosis.

Source: Daschner, Alvaro. “An Evolutionary-Based Framework for Analyzing Mold and Dampness-Associated Symptoms in DMHS.” Frontiers in immunology vol. 7 672. 9 Jan. 2017, doi:10.3389/fimmu.2016.00672. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).

Sources of Exposure

Mold is a significant source of indoor and outdoor air pollution. Climate change, increased humidity, and high carbon dioxide concentrations can increase mold spore production and allergenicity, especially for the common mold Alternaria alternata (Haahtela 2013). An increase in global temperatures of just 2 degrees Celsius favors not only mold growth but also production of harmful aflatoxins (Theoharides 2018). Additional factors that enhance mold growth and mycotoxin exposure include poor management of agricultural commodities and natural disasters (Mehrzad 2021).

The most encountered indoor molds include Cladosporium, Penicillium, and Aspergillus species. Mold thrives where there is a lot of moisture and can grow on a wide variety of surfaces including wood, paper, paint, wallpaper, drywall, carpet, and fabric. Mold can be found in abundance in dust as well (CDC 2022). Some molds, e.g., Aspergillus species, are ubiquitous in both indoor and outdoor settings, and development of infection likely depends on the immune competence of the exposed individual (Bush 2006).

Conditions favorable to fungal growth can increase mold concentrations, especially with poorly maintained structures and improperly repaired leaks. Indoor mold exposure is associated with coughing, wheezing, and rhinitis symptoms in adults and children. Exposure to moisture damage in schools has been associated with nasal symptoms, coughing, wheezing, and absence from school in children. Specific exposure to Alternaria alternata, a mold found indoors and outside, is associated with increased symptoms and prevalence of asthma. Mycotoxins and inflammatory fungal compounds, including beta-1,3-D-glucan (BDG), have also been associated with coughing, nasopharyngeal irritation, and eye irritation (Burbank 2023). Of ten fungal species tested in a study of indoor dust samples, the mold Cladosporium herbarum had the highest BDG content which correlated with prevalence of the microbe. Researchers suggest that concentration of BDG may be a surrogate measure of the prevalence of mold in a specific environment (Iossifova 2007).

Large doses of mycotoxins can occur from ingesting food that has been contaminated or spoiled. However, low doses may not cause illness and not all mold species produce toxins. Aflatoxin and ocratoxin are common mycotoxins found in grains, wine, and peanuts, though regulations are in place to surveil and limit the amount allowed in foods (Bush 2006). Aflatoxin and ocratoxin are considered human carcinogens and chronic consumption is associated with liver and kidney tumors (Redd 2002). Aflatoxin crosses the placenta and makes its way into breast milk and nursing infants (Githang'a 2019).

Control mold growth inside the home: (CDC 2022)

  • Controlling humidity levels- keep humidity levels as low as you can—between 30% and 50%–all day long
  • Promptly fixing leaky roofs, windows, and pipes
  • Thoroughly cleaning and drying after flooding
  • Ventilating shower, laundry, and cooking areas
  • Consider not using carpet in rooms or areas like bathrooms or basements that may have a lot of moisture.

Signs and Symptoms of Mold Exposure

Mold exposure is associated with varying degrees of illness including invasive mycoses and mold-associated hypersensitivity syndromes. The most frequent cause of mold-related infections are Aspergillus species while the most common non-Aspergillus offenders belong to the Mucorales order which are associated with hypersensitivity pneumonitis (Page 2020).

Mold exposure has long been suspected of causing allergic rhinitis and can exacerbate breathing difficulties in chronic respiratory diseases, including COPD and asthma (Redd 2002).

Exposure to mold in the workplace has been associated with sick-building syndrome (SBS), a phenomenon marked by headache, fatigue, and irritation of the nose, throat, eyes, hands, facial skin, or upper respiratory tract, symptoms that improve when away from the workplace. Data from the 10-year prospective European Community Respiratory Health Survey (ERHC) found that a higher cumulative exposure to building dampness, water leakage, and visible indoor mold growth was associated with decreased remission of symptoms. Symptoms evaluated via questionnaire included dermal, mucosal, and general symptoms, with the latter two symptom types being most prevalent (Zhang 2012):

  • Dermal symptoms: Facial itch, facial rash, hand itch, hand rash, eczema
  • General symptoms: Headache, nausea, sensation of getting a cold, tiredness
  • Mucosal symptoms: eye irritation, swollen eyelids, nasal catarrh and obstruction, dryness in the throat, sore throat, irritating cough

Further evaluation of data from the ERHC notes that general and mucosal symptoms were higher in those with pre-existing asthma and in women. The incidence of general symptoms also increased with indoor painting (Sahlberg 2012). Researchers note that floor dampness observed in SBS is also associated with toxins released from water-based glue and phthalates from plastic floor covering (Zhang 2012).

Potential Symptoms of Mold Exposure (Bush 2006, CDC 2022, CPSC 2015, Theoharides 2018, Empting 2009)

  • Altered mental status
  • Attention deficits
  • Allergies, sensitization
  • Asthma
  • Blunted executive function
  • Brain fog
  • Chest tightening
  • Coughing
  • Dizziness
  • Fatigue
  • Fever
  • Headaches
  • Irritability
  • Irritation of nose and throat
  • Itchy eyes or skin
  • Keratitis
  • Muscle aches
  • Mycosis
  • Neurotoxicity
  • Onychomycosis
  • Otomycosis
  • Paresthesias
  • Respiratory infections
  • Rhinitis, stuffy nose
  • Sensitization
  • Shortness of breath
  • Short-term memory deficits
  • Sinusitis
  • Skin infections
  • Sneezing
  • Systemic infections
  • Wheezing

Potential Signs and Symptoms of Mycotoxin Exposures: (CPSC 2015, Yike 2006)

  • Cancer (liver, esophageal, lymphoma, skin, and gastric)
  • Hemolytic effects
  • Hypertension
  • Hyperlipidemia
  • Immunosuppression
  • Liver toxicity
  • Nasal irritation
  • Nephrotoxicity

Examples of Mold-Specific Health Effects (CPSC 2015)

Genus/Class

Health Effects

Alternaria

 

Allergen and asthmagen

Opportunistic pathogen, opportunistic infections primarily of skin, eye and nose

Alternaria toxin

Limited data; parenteral data suggest may have development
effects; mutagen

Aspergillus

Opportunistic invasive infections

Superficial infection of nose, skin, ears, nails; sinusitis; aspergillosis.
Allergen and asthmagen

Aspergillus toxin

Aflatoxin (1)
Citrinin (2)
Ochratoxin (3)
Sterigmatocystin (4)

(1) Liver, immune, cancer; limited data suggest skin and eye irritant
(2) Kidney, liver; nasal irritant (limited data), eye irritant
(3) Kidney, liver, immune, neuro, repro, developmental, cancer
(4) Liver, kidney, cancer

Various other toxins

Chaetomium

Opportunistic pathogen

Infection of skin, ails, and cornea –usually opportunistic

Chaetomium toxin

Chetoglobosins

Limited data: Possible liver, immune, and developmental effects, but data inadequate.

Many minor toxins

Cladosporium

Opportunistic pathogen

Infection of skin, nails, and cornea.
Allergen and asthmagen

No toxins

Dicyma

Maxillary Sinusitis

Minor toxins, no data

Epicoccum

Infection of skin and lung.

Suggested allergen and asthmagen

Malassezia

Common on skin (healthy and diseased)

Opportunistic

Pityriasis versicolor– hyperpigmentation; psoriasis, seborrheic dermatitis, dandruff, eczema, nail infection.

Allergen and asthmagen

No toxins

Penicillium

Opportunistic

Superficial infection of nose, skin, ears, nails

Allergen and asthmagen

Penicillium toxin

 

Citrinin: Kidney, liver; nasal irritant (limited data), eye irritant

Ochratoxin: Kidney, liver, immune, neurological, reproductive, developmental, cancer

Phoma

Opportunistic
Superficial and invasive infections of skin, nails and lung.

Allergen and asthmagen
Associated with eye, skin, respiratory tract irritation but not causally linked

Various minor toxins- No data

Stachybotrys

No infections, all effects due to toxins;
Eye skin and respiratory irritation reported but causality not shown
No clear association with allergy/asthma

Stachybotrys toxin

Cyclosporine (1)


Trichothecenes,
including satratoxins (2)

(1) Immune, kidney, liver, cancer
(2) Respiratory

Various other toxins
VOCs include alcohols, ketones, hydrocarbons, ethers and esters

Rhizopus
(Zygomycetes)

Opportunistic,
but potentially
severe

Infections of nose,
lung, skin,
gastrointestinal tract

No toxins

Initial Steps for Assessing Mold Exposure (Kespohl 2022)

  • If patient history points towards mold exposure, an accurate diagnosis has to be established.
  • Relevant issues to be addressed include the cause of the patient’s complaints, and to determine the trigger of the adverse health effects – sensitization, allergy, exposure to irritants or toxic mold components, or an interaction of mold and bacteria.
  • There are few commercial test allergens available to perform skin tests for suspected mold allergy, and even less mold extracts for provocation tests.
  • To detect toxic/irritant effects, it is necessary to know the responsible mold species and to be able to quantify the exposure, which is usually not possible.
  • Furthermore, it is not known if a retrospectively collected air or dust sample can provide information on exposure, or whether there are immunological parameters that can indicate mold and/or bacterial exposure.
  • Other open questions include:
    • how to verify a patient’s suspicion of exposure to molds
    • to determine whether mold-specific IgG is useful
    • to ascertain if the exposure occurred at the workplace, and
    • whether it is at all necessary to distinguish between occupational exposure and exposure at home.
    • Regardless, the specific causes of the exposed patient’s complaints should be identified and where possible, the disease as well.
  • Accordingly, the German guideline for clinical diagnosis of indoor mold exposure recommends objectifying mold-/dampness-induced health problems, such as asthma, allergic rhinitis, hypersensitivity pneumonitis, and respiratory infections.
  • The following aspects should be inquired about in the medical history:
    • History of exposure in the living, working, and recreational areas
    • Allergy and infection history, including predisposing factors
    • History of irritative-toxic and odor effects
    • Disturbances in well-being

Molds commonly tested for (Kespohl 2022 Zhang 2012, Quest Diagnostics)

  • Alternaria alternata
  • Aspergillus fumigatus
  • Cladosporium herbarum
  • Mucor racemosus
  • Penicillium chrysogenum
  • Quest Diagnostics Mold Panel #1 tests for IgE antibodies to a variety of mold: Penicillium notatum (m1) IgE; Cladosporium herbarum (m2) IgE; Aspergillus fumigatus (m3) IgE; Alternaria alternata (m6) IgE; Helminthosporium halodes (m8) IgE (Quest Mold1).
  • Quest Diagnostics Allergy Mold Panel tests for IgE antibodies to Alternaria alternata (m6), Aspergillus fumigatus (m3), Cladosporium herbarum (m2), Mucor racemosus (m4), Penicillium notatum (m1), Stemphylium botryosum (m10) (Quest Mold Allergy Mold Panel)

Potential Biomarkers of Mold Exposure

Exposure to mold, including exposure to dampness suspected of being mold-related, has been associated with increased serum immune and inflammatory markers.

Data from the 10-year ERHC study found that dampness, water leakage, and mold odor in the workplace were associated with increased CRP and total IgE, as well as elevations in eosinophil count, and eosinophil cationic protein (ECP), indicators of eosinophilic inflammation. Prior research revealed an association of SBS with elevated serum myeloperoxidase (MPO), a marker for neutrophilic inflammation (Zhang 2012).

The presence of IgE in serum is an indicator of an allergic immune response. An estimated 10% of the population will generate IgE antibodies to common inhalant molds, though only half of these individuals are expected to have an allergic reaction upon exposure (Bush 2006). Elevated IgE antibodies to mold is a common finding in patients with allergic rhinitis and atopic dermatitis, and allergic reaction to inhaled mold is widely considered a factor in asthma and other lower airway disease. Research indicates that children exposed to indoor mold or dampness were more likely to experience coughing and wheezing than children who were not. Researchers note that while IgE measurement is valuable in assessing mold-related disorders, IgG measurement may only be of value in specific cases, e.g., suspected hypersensitivity pneumonitis or allergic bronchopulmonary mycosis coupled with clinical and historical evidence of exposure. Measurement of IgA and IgM antibodies to molds or antibodies to mycotoxins may not be clinically useful (Bush 2006).

Analysis of biomarkers and respiratory symptoms was carried out in 46 individuals with known mold exposure and 23 without exposure. Results demonstrated significantly higher total IgE in those exposed and significantly higher specific IgE to mold sample mx1, containing Aspergillus fumigatus, Penicillium chrysogenum, Cladosporium herbarum, and Alternaria alternata. Results confirmed earlier findings that IgE testing with mx1 mold mixture is a valid screening tool for assessing potential mold sensitization. IgG testing was not found to significantly identify sensitization to mold. Earlier research also found that elevated sIgE to Aspergillus fumigatus was associated with a 2.7 greater risk of asthma. Previous research also suggests that additional biomarkers may be useful, including IL-6, serum amyloid A (SAA), and CRP, which may be elevated with mold exposure, and significantly decreased levels of anti-inflammatory club cell protein 16 (CC16). Decreased CC16 is also seen in asthmatics and tobacco smokers. The current study found that asthmatics were significantly more likely to be sensitized to molds than non-asthmatics, i.e., 55% versus 18% (Kespohl 2022). It should be noted that some individuals may be hypersensitive to the presence of mold while others may be asymptomatic, and that some mold species, such as Aspergillus, may be able to colonize humans without causing infection (Daschner 2017).

Exposure to mold may not always translate into sensitization or related pathologies, e.g., allergic fungal rhinosinusitis, asthma, and hypersensitivity pneumonia. Although serum antibodies to mold may be valuable for detecting exposure, they cannot determine dose, time, or length of exposure. Researchers suggest that evaluating T-cell frequencies can be useful in the clinical assessment of mold exposure. Research indicates that the number of A. fumigatus-specific T-helper cells was elevated in subjects with intensive mold exposure. Increased mold-specific T-cell counts have been observed in known mold infections such as invasive pulmonary aspergillosis or mucormycosis. However, they may also be detected in healthy subjects in correlation with work or residential mold exposure. One study found that frequencies of T-helper cells specific to A. fumigatus and Mucorales were significantly greater in those who reported high versus low mold exposure. Measuring cytokine response patterns may also assist in the evaluation of mold exposure, including elevations in IFN-gamma, TNF-alpha, IL-5, IL-13, and IL-17. However, researchers suggest further clinical studies to validate these tools (Page 2020).

Optimal protection from mold infection may depend on a balance Th1 and Th2 immune responses. A Th2 immune response often results in an allergic response or susceptibility to infection, while a Th1 immune response is required to clear a fungal infection. The principal T helper subsets contributing protective immunity from pathogenic fungi are Th1 and Th17 (Daschner 2017).

Albumin is able to bind mycotoxins and create adducts that are measurable in serum. For example, the potent S. chartarum toxin satratoxin G (SG) binds prolifically with albumin to create SG-albumin adducts that can be measured in serum (Daschner 2017). Serum albumin adducts are currently measured to gauge exposure to aflatoxin B1 as well as other toxic xenobiotics and chemicals (Yike 2006). Data from the 1999-2000 NHANES study found detectable levels of aflatoxin B1-lysine adduct in just 1% of the US population, despite an expected spike due to weather and agricultural factors (Schleicher 2013). Concentrations of mycotoxins and their metabolites in blood and urine may reflect total body burden and can be useful in assessing mold exposure (Franco 2021).

The contents of nasal lavage fluid can also be evaluated when assessing mold exposure. One study of 12 subjects exposed to a damp water-damaged building observed elevated levels of albumin and myeloperoxidase (MPO) in nasal lavage specimens. Microorganisms detected in the water-damaged building, especially in the gypsum wallboard, included Stachybotrys and Penicillium mold species, as well as bacteria and yeast species (Walinder 2001). Increased TNF-alpha, IL-6, and nitrate levels in nasal lavage fluid have also been associated with exposure to a moldy building (Zhang 2012).

Potential Blood Chemistry Patterns for Mold Exposure

Increased

Decreased

Albumin-mycotoxin adducts

CRP

Cytokines: IFN-gamma, TNF-alpha, IL-5, IL-13, and IL-17.

Eosinophils

IgE, total and specific

MPO

SAA

CC16

Evaluation of general inflammation markers may also enhance the clinical picture when assessing for mold exposure. These include elevations in the following:

  • Anion gap (Farwell 2010)
  • Complement C3, C4 (Nilsson 2014),
  • Copper to zinc ratio (Malavolta 2015)
  • CRP, hs-CRP (Pagana 2021)
  • ESR (Pagana 2021)
  • Ferritin (Pagana 2021)
  • Fasting glucose (Madsbad 2016)
  • Fibrinogen (Pagana 2021)
  • Globulin (Yang 2018).
  • IgA (Gonzalez-Quintela 2008)
  • Myeloperoxidase (Tavora 2009).
  • Neutrophil to lymphocyte ratio (Balta 2016).
  • Platelets (Pagana 2021)
  • RDW (Ai 2018)
  • WBCs (Pagana 2021)

Optimal Takeaways

  • Mold is ubiquitous in the human environment and may or may not cause symptoms depending on an individual’s immune competence and tolerance.
  • It is difficult to assign a specific set of biomarkers or clinical symptoms to the phenomena or mold-associated illnesses
    • Individuals respond to factors in their environment in unique and specific ways depending on immunocompetence and genetic factors
    • The same suspected agents and level of exposure may induce symptoms in one individual and not in another
  • Evaluation of mold exposure should incorporate any history of allergies and asthma, mold exposure, current symptoms, and general medical history.
  • Biomarkers that may be useful in the evaluation of mold exposure include CRP, MPO, SAA, eosinophils, eosinophil cationic protein (ECP), total and specific IgE, and specific cytokines, including IFN-gamma and TNF-alpha.
  • Mycotoxin-albumin adducts may be valuable in the assessment of mold exposure but may not be readily available.
  • It is always prudent to reduce exposure to mold and mycotoxins as much as possible to minimize the risk of infection and disease

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Tag(s): Biomarkers

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