Citation: Marzena Połaska, Barbara Sokołowska. Bacteriophages—a new hope or a huge problem in the food industry[J]. AIMS Microbiology, 2019, 5(4): 324-346. doi: 10.3934/microbiol.2019.4.324
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Mycobacterium avium complex organisms and other nontuberculous mycobacteria (NTM) are waterborne opportunistic pathogens with a strong propensity for surface adherence and biofilm formation. M. avium complex and other NTM are slow growing, hydrophobic, and impermeable to nutrients due to the presence of a lipid-rich outer membrane. Although those features result in slow mycobacterial growth, their metabolism is rapid and robust and the hydrophobic impermeable outer membrane confers antibiotic- and disinfectant-resistance. M. avium complex and NTM are found in natural waters and also colonize, grow, and persist in drinking water distribution systems and premise plumbing. Their presence in plumbing in hospitals is associated with life-threatening nosocomial infections. Efforts to eradicate M. avium complex and NTM are thwarted by their preference for surface adherence and biofilm formation. This review identifies those M. avium complex features in hopes that methods to reduce numbers and hence exposure and infection of those opportunistic pathogens can be developed.
M. avium complex, including M. avium, M. intracellulare, and M. chimaera are opportunistic premise plumbing pathogens that share many environments with humans. In short, humans are surrounded by mycobacteria [1]. Of present concern is that the incidence and prevalence of pulmonary disease caused by mycobacteria, predominantly M. avium complex in the United States, is increasing a rate of 5-10% annually [2]. Risk factors for M. avium complex pulmonary disease include: chronic obstructive pulmonary disease (COPD), bronchiectasis, a history of smoking, silicosis, and other occupation-related lung conditions [3]. Currently, women who are older (>60 years), taller (>5′8″), and slender (BMI < 22), first identified in 1989 [4], are at increased risk for M. avium complex pulmonary disease and make up the majority of infected individuals. Taller, slender, older men are also at increased risk for M. avium complex pulmonary disease. The treatment of M. avium complex pulmonary disease requires a long-term course of multiple antibiotics [5]. However, if patients can tolerate the side effects of the multiple antibiotics, they can be free of disease symptoms. Unfortunately, recurrence of symptoms and reappearance of mycobacteria in sputum is high; namely, 25-50% of patients depending on the study [6,7]. Recurrence of symptoms coincides with either recovery of the same M. avium complex strain or another Mycobacterium spp. from sputum samples. Young children (18 months to 5 years) are susceptible to M. avium-caused cervical lymphadenitis [8]. As these youngsters have erupting teeth with the associated trauma to the gums, cervical lymphadenitis is consistent with environmental acquisition of M. avium and infection of the local cervical lymph nodes. The best treatment for M. avium cervical lymphadenitis is surgical excision of the infected lymph node(s) [8].
Infection sources of M. avium complex includes soils, especially peat-rich, pine forest soils [9], natural waters (e.g., streams, rivers, lakes) [10], and drinking water in distribution systems [11] and premise plumbing [12]. Demonstration that the DNA fingerprints of M. avium isolates from a showerhead matched those of an M. avium-infected patient who used the shower [13] was followed by a DNA-based survey of bacteria in United States showerheads. That survey showed that 70% of U.S. showerheads, had Mycobacterium spp. and of those 30% had M. avium [14]. As it would be understood that the majority of the showerheads came from homes of individuals that were not infected by M. avium, the results demonstrated that humans are surrounded by Mycobacterium spp., including M. avium. Hospital plumbing and water-containing medical equipment, such as bronchoscopes [15], can become colonized by M. avium complex organisms and thereby transferred to patients during examination or sample withdrawal. The most dramatic example of mycobacterial colonization, hospital transmission, and infection was disclosed in October 2015. M. chimaera, was shown to have colonized heater-coolers using during cardiac surgery and patients were infected as a result of the aerosolization of the M. chimaera cells during surgery [16].
The colonization and persistence of M. avium in drinking water in homes and hospitals is due to a number of factors, including: biofilm-formation [17], growth in drinking water [11,18], resistance to disinfectants (e.g., chlorine) used in water treatment [19], growth at low concentrations of organic matter in drinking water [20], resistance to high temperatures (e.g., 50-65 °C), and growth at low oxygen concentrations (6-12% oxygen) [21].
The major determinant of M. avium complex ecology is the lipid and wax-rich outer membrane that surrounds the cells [22]. It is composed of long chain fatty acids (C60-C80) and makes up 30% of the entire cell mass. This outer membrane is responsible for M. avium's slow growth (1 gen/day), as a substantial fraction of energy is diverted to synthesis of the lipids. In addition to high cell surface hydrophobicity—for example, a droplet of water will form a bead on the surface of M. avium cells collected by filtration—the outer membrane of M. avium is quite impermeable to nutrients [23]. The outer membrane presents us with a thought-provoking example of cost-benefit analysis. First, that impermeable membrane reduces the transport of nutrients into the cytoplasm [23] thus, in part, limiting the rate of growth; a clear cost. However, that impermeable membrane also makes M. avium cells quite resistant to disinfectants, like chlorine [19], and other anti-microbial compounds (e.g., metals) [24]; a clear benefit. That benefit means M. avium cells survive disinfection of drinking water and, in the absence of other microbial cells (killed by disinfectant), they can consume the remaining organic matter.
Biofilms are selective environments, placing demands on planktonic microbial cells. Adherence can be inhibited by surface toxicity, as proposed responsible for the few cells of Pseudomonas aeruginosa adhering to copper pipes [25]. A pre-existing microbial biofilm may stimulate, inhibit, or have no effect on adherence of a particular microbial species or type. For example, early studies of adherence relied upon “conditioning” a surface with protein (e.g., bovine serum albumin); without a conditioned surface a particular microorganism would not adhere and form a biofilm. In contrast, M. avium is a “biofilm pioneer”. Its hydrophobic surface drives its adherence to surfaces of all composition [17]. Further, as described below, M. avium compete for adherence to surfaces with another “biofilm pioneer”, the Methylobacterium, a genus of common waterborne bacteria that form a “pink slime” in showers, shower curtains, and bathtubs.
Persistence of a species in a biofilm places selective constraints on microbial cells. Due to the layers of cells embedded in an extracellular matrix, an M. avium complex biofilm comprised of lipid, protein, and DNA [26,27], penetration of oxygen and nutrients is limited [28]. Thus, a species commonly found in biofilms must be able to grow under low oxygen and low nutrient conditions. There may be a unique challenge to non-mycobacterial cells in biofilms as it has been shown that mycobacterial biofilms contain free fatty acids [26,27] and free fatty acids are antimicrobial. Another antagonistic interaction was shown by the observation that Mycobacterium abscessus was capable of degrading quinolone-based quorum-sensing molecules produced by Pseudomonas aeruginosa [29], thus inhibiting biofilm formation by the pseudomonad. Further, it has been shown that biofilms of mycobacteria contain a substantial proportion (∼10%) of mycobacterial cells that survive exposure to antibiotics at concentrations higher than the minimal inhibitory concentration [27]. Although the metabolic state of those persisting cells is unknown, the consequence is that mycobacterial cells in biofilms can survive antibiotic challenge. It is to be expected that further studies of biofilm microbiomes may lead to discover of co-metabolizing microbial partners that coexist in biofilms by virtue of cross-feeding nutrients. Further, such studies may lead to identification of “trophic trees” describing chemical interactions between microbial species in biofilms.
Surface adherence and biofilm formation is a necessity for members of the M. avium complex; without adherence, the slow-growing M. avium complex cells would be washed away in any flowing system, like rivers and water pipes. M. avium complex residence in flowing systems is due to their high cell surface hydrophobicity. In fact, Mycobacterium spp. may be the most hydrophobic of bacterial cells [30]. It is likely hydrophobicity that drives M. avium cells to adhere to surfaces as that action reduces the surface area in contact with the positive and negative ions in water. As suggested above, M. avium cells may be “biofilm pioneers”, adhering to surfaces through hydrophobic interactions in advance of other microorganisms, thereby “conditioning” the surfaces for further microbial colonization. Hydrophobicity is such a strong determinant of the special distribution of M. avium complex and other environmental mycobacteria, that the number and density of surface-adherent cells far outnumbers the number of cells in suspension.
Three experimental observations document the preference of M. avium complex for surface adherence. First, numbers of M. avium complex cells in biofilms far surpass numbers in water. For example, common values for M. avium complex numbers in drinking water in household plumbing ranges from 100-1,000 colony-forming units (CFU)/mL [12]. In contrast, numbers on pipe surfaces in the same households is between 10,000-20,000 CFU/cm2 [12]. Second, reduction of turbidity of water entering drinking water treatment plants is an effective method to reduce Mycobacterium spp. and M. avium complex densities in drinking water [11]. This is due to the fact that mycobacteria from environmental waters enter water treatment plants attached to soil particles and a reduction in turbidity reduces not only particulates, but also the particulate-adherent Mycobacterium spp. and M. avium complex cells [11]. The third example comes from our development of disinfection protocols for reducing numbers of M. chimaera in heater-coolers. Each of the 2-10 liter water reservoirs of heater-coolers were inoculated with approximately 100 billion cells (1011 CFU) to produce a worst case scenario for any disinfection protocol. Surprisingly, rather than recovering the 15 million cells/mL as we expected, less than 1 million (>6%) were recovered (Falkinham, in preparation). Those missing cells had not been killed, but simply lost from suspension because of their adherence to the pipes, tubes, pump, and reservoir surfaces. The critical fact was that the adherent M. chimaera cells were in biofilms, and almost completely resistant to disinfectant. Although exposure to chlorine killed greater than 3-logs of suspended M. chimaera cells in the reservoir water of the heater-cooler, the majority of cells survived in the biofilms and rapidly (1 week) re-inoculated the reservoir water (Falkinham, in preparation). What is critically needed is a method to “disrupt” the biofilm to render cells more accessible to disinfectant. Such an approach involving enzyme-detergent formulations has been shown to increase removal of biofilm cells from biofilms [31,32].
Realization that M. avium and other Mycobacterium spp. cells prefer surface adherence to residence in suspension have led us to change our sampling strategy for their recovery and enumeration from environmental samples. Although we can isolate, enumerate, identify, and type M. avium cells from drinking water samples in households and hospitals, we recover many more by sampling the biofilms on the pipes. This provides us with a higher sensitivity of detection of Mycobacterium spp. and also a better picture of the diversity of M. avium types and clonal variants. That, in turn, increases our ability to find exact fingerprint matches between patient and environmental isolates [13].
If the lipid- and wax-rich outer membrane was not enough to provide resistance to disinfectants, antibiotics, and other antimicrobials (e.g., heavy metals) [24], biofilm formation increases both disinfectant [33] and antibiotic-resistance [34]. This is consistent with observations of other biofilm-forming opportunistic premise plumbing pathogens such as Pseudomonas aeruginosa. The extracellular matrix and the layers of cells reduce penetration and diffusion of disinfectant or antibiotic to the mycobacterial cells [28]. However, that is not all. Cells of M. avium complex grown in biofilms yet recovered and mechanically-treated to yield single cell suspensions are significantly more disinfectant-resistant [33] or antibiotic-resistant [34] than cells grown and exposed in suspension. That increased resistance is adaptive and transient, for overnight growth of the biofilm-grown and resuspended cells yields cells with susceptibilities to either disinfectants or antibiotics that are the same as cells grown in suspension [33,34]. The rapid loss of that adaptation to antimicrobial resistance of M. avium cells is not surprising as their metabolic rate is as high as that of E. coli. Slow mycobacterial growth (i.e., 1 gen/day at 37 °C) is not evidence of slow metabolism but rather due to the expenditure of a large fraction of energy on the synthesis of the C60-C80 long chain lipids and waxes. That rapid loss of adaptive antimicrobial resistance may prove to be a value in eradicating M. avium complex and other nontuberculous mycobacteria from premise plumbing, including hospital plumbing. The strategy would be to exposure mycobacterial biofilms to a disinfectant for a short period of time, allow for a period of time to lose the adaptive biofilm-induced resistance, and then re-expose. That approach might prove to be superior to eradication by long-term continuous exposure as continuous selective pressure would maintain the adaptive resistance.
M. avium complex cells show a hierarchy of short term adherence to surfaces [17]. In part, it is likely that some of the heterogeneity in results is due to employing a variety of strains whose identity is not thoroughly established due to the continuing discoveries of novel species; in particular, M. chimaera [35] and its separation from M. intracellulare [36]. However, before reviewing that data, it is important to understand the two separate and distinct steps of biofilm formation: adherence and growth of adherent cells to form a biofilm. Adherence is measured by exposing a surface to a suspension of cells for relatively short periods of time (1-6 h at 25 °C). For M. avium complex organisms, adherence is relatively rapid and does not require any “conditioning” of the surface and the increase in adherent M. avium complex cells reaches a plateau within 3-6 h at 25° C [17]. After 6 h adherence, the surfaces can be removed from the suspension, rinsed with sterile tap water, and the coupons incubated in sterile water or medium to measure the growth of cells (i.e., biofilm formation). If the surfaces are not removed from the cell suspension, increases in numbers of adherence cells are due to not only growth of adherent cells but also include increases in numbers due to continued adherence. A great number of investigations of mycobacterial biofilm formation have suffered from that defect leading to an inability to measure the rate of adherence and just report the rate of accumulation. Biofilm formation, for these slowly-growing bacteria (1 gen/day), appears to reach a maximum number of adherent CFU/cm2 by 21 days incubation at room temperature [17]. Specifically, by 21 days, surface densities ranged from 1.4 × 107 (galvanized steel) to 5.5 × 103 (copper) CFU/cm2 [17].
Cells of M. avium appear to have a hierarchy for adherence. The hierarchy for at least one strain of M. avium adherence to surfaces was: galvanized stainless steel, stainless steel, polyvinyl chloride plastic, glass, and copper [17]. Highly rough surfaces such as those of galvanized stainless steel accumulated up to 15,000 CFU/cm2 within 3 h at room temperature [17]. In the absence of independent measures of surface hydrophobicity and roughness, it is not known whether both are factors and to what extent. Surface topology (e.g., roughness) has been shown to influence Mycobacterium abscessus adherence to surfaces [37]. Other factors, such as metal composition, could be involved as well. High numbers of adherent M. avium cells on galvanized surfaces could be due to the fact that numbers of M. avium in natural waters are positively correlated with the concentration of zinc [38]. Likewise, as copper surfaces accumulated the lowest numbers of M. avium cells [17] and low numbers of adherent M. avium cells were found on copper pipes in a pilot distribution system harbored low numbers of M. avium and almost no other microbial cells [20]. Those observations are also consistent with the fact that M. avium cells are relatively resistant to copper compared to other bacteria [24]. Quite possibly, copper and zinc pipes are somewhat selective for M. avium adherence. On PVC surfaces, M. avium biofilm formation was influenced, but not totally dependent upon the presence of Ca2+, Mg2+, and Zn2+ ions in solution [39]. Two other M. avium characteristics have also been shown to promote adherence and biofilm formation; presence of surface glycopeptidolipids [40] and sliding motility [41].
The salmon pink-pigmented methylobacteria are common premise plumbing inhabitants. Methylobacterium spp. are major colonists of shower curtains [42] and shower heads [14]. Like M. avium, methylobacteria readily form biofilms, likely due to their high cell surface hydrophobicity (Swetkowski and Falkinham, in preparation). In a study of showerhead biofilms, it was shown that methylobacteria were quite common in shower head samples collected across the United States [14]. More prevalent were the mycobacteria; but that was not too surprising. What was surprising was that when methylobacteria were present in shower head biofilms, mycobacteria were absent, and vice-versa [14]. A study of plumbing biofilms in homes of M. avium infected women in Wynnewood, Pennsylvania showed the same pattern; when methylobacteria were present in high numbers, M. avium was absent [43]. A laboratory study has further showed that the presence of an established (21 day) Methylobacterium spp. biofilm significantly inhibited the adherence of M. avium cells [44]. The fact that different portions of the plumbing of houses may either have M. avium and no Methylobacterium spp. or Methylobacterium spp. and no M. avium, have led us to the hypothesis that the two compete for adherence when the plumbing is first filled with water. We have no evidence that Methylobacterium spp. cells can dislodge M. avium cells in a biofilm.
As M. avium complex- or NTM-infected patients and their physicians are aware of relapse and reappearance of disease symptoms [6,7], those patients want to avoid mycobacterial exposure in their homes. Fortunately, if they have pink slime in showers, showerheads, sinks, or taps, it is unlikely that they have M. avium or any other NTM and can avoid installing microbiological point-of-use filters. Thus, presence of pink-slime is a strong indicator of the absence of M. avium or any other NTM.
The perspective that follows is based on translating knowledge of mycobacterial ecology and physiology to improve patient outcomes. The following paragraphs briefly summarize possible mycobacterial research objectives focused on their preference to adhere, grow, and persist in biofilms in premise plumbing. They include: (1) identification of Methylobacterium spp. cell fractions able to inhibit adherence of M. avium cells, (2) developing protocols to “disrupt” biofilms, thereby releasing M. avium cells and increasing their exposure to disinfectants, (3) elucidating the molecular basis for M. avium adaptation to disinfectant-resistance as a result of growth in biofilms, and (4) identifying other waterborne microorganisms whose presence is linked to M. avium presence or absence.
Toward the objective of identification of Methylobacterium spp. cell fractions able to inhibit adherence of M. avium cells, we discovered that the viability of the Methylobacterium spp. cells in a biofilm was not required to inhibit M. avium adherence. In fact, killed whole cells in biofilms can inhibit M. avium adherence (Muńoz-Egea, personal communication). We have initiated a project to identify whether cell fractions of Methylobacterium spp. cells coating a pipe can inhibit M. avium adherence. Methylobacterium spp. cell fractions could be used as a probiotic for plumbing, to prevent M. avium colonization of premise plumbing and medical equipment. Again it is important to point out that we have no evidence that Methylobacterium spp. cells can dislodge M. avium from a biofilm. That means Methylobacterium spp. cells or cell fractions could not be employed to reduce M. avium in a pre-existing biofilm. However, an immediate application of this technology could be used to prevent M. chimaera colonization and biofilm-formation in heater-coolers by introducing killed Methylobacterium spp. cells or cell fractions when the heater-cooler is first filled with water and its operation tested. That would prevent M. avium or NTM colonization and biofilm-formation and thereby reduce the aerosolization of any Mycobacterium spp. cells.
It is generally acknowledged that microbial cells in biofilms are resistant to antibiotics, disinfectants, and other antimicrobial agents. Another project is to develop protocols to “disrupt” biofilms, thereby releasing M. avium cells and increasing their exposure to disinfectants. Such “disruption” has been disclosed in an article describing the use of enzyme-detergent formulations to remove biofilms [28]. Not only was the efficacy of such enzyme-detergent formulations shown to catalyze biofilm release from surfaces, but the data showed species-specific release [31,32]. Specifically, a protease formulation released more Bacillus sp. biofilm compared to a polysaccharidase containing formulation. Conversely, the polysaccharidase-formulation was more effective at removing Pseudomonas fluorescens biofilms than was the protease formulation [31]. It would be of value to identify which type of enzyme-detergent formulations would be most effective in releasing M. avium biofilms.
The observations that M. avium cells grown in biofilms yet isolated as single-cell suspensions were transiently more resistant to chlorine [33] or antibiotics [34], has focused our attention on mechanisms of adaptation of M. avium. Unlike other bacteria that grow rapidly, M. avium grows slowly, not as a result of slow metabolism and energy generation, but because it expends a great deal of energy in synthesis of the thick, lipid-rich outer membrane. M. avium generates energy at the same rate as does Escherichia coli. It grows slowly because energy is diverted to C60-C80 lipid synthesis. Thus, upon exposure to an environmental stress such as disinfectant, antibiotic or elevated temperature, M. avium cells can induce protective proteins leading to survival. In rapidly growing bacteria, division occurs before protection and death ensues. Preliminary experiments in the lab have shown that M. avium grown at 42 °C have 10-fold higher levels of trehalose compared to those grown at 25 °C. As high trehalose concentrations have been associated with resistance to temperature, desiccation, toxic oxygen compounds, and salinity [45], induction of elevated levels of trehalose in M. avium could be induced by biofilm growth as well as temperature.
Finally, evidence that Methylobacterium spp. cells could inhibit Mycobacterium spp. adherence to surfaces, came from studies of the microbiomes of showerheads [14]. As the samples analyzed came from showerheads across the United States [14], the observation was global and not just due to a particular set of local water conditions. That fact stimulated our interest and further exploration resulting in the data presented above. Further mining of the data in Feazel et al. [14] or additional analyses of the microbiomes of hospital plumbing, might lead to discovery of other M. avium antagonists or heretofore undiscovered microbial species that aid establishment of M. avium in premise plumbing.
Research in the author's laboratory has been supported by grants from the Nontuberculous Mycobacteria Information and Research Foundation, the Water Research Foundation, the National Science Foundation CBET award 1033498, and the National Institutes of Health grants AI-13813, AI23710, and AI-30373.
The author is a consultant to the following manufacturers of heater-coolers: LivaNova, Cincinnati Sub-Zero, Terumo Medical, and Stryker Medical and Pall Medical, manufacturer of microbiological and particulate filters.
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