Mycoplasmal Infections in CFS, FMS and GWI

We have been particularly interested in the association of certain chronic infectious agents in CFS, FMS and GWI, because these microorganisms can potentially cause most or essentially all of the signs and symptoms found in these patients.(1,14) One type of infection that elicited our attention was microorganisms of the class Molecutes, small bacterial mycoplasmas, lacking cell walls, that are capable of invading several types of human cells and are associated with a wide variety of human diseases.(14)

We have examined the presence of mycoplasmal blood infections in GWI, CFS, and FMS patients. The clinical diagnosis of these disorders was obtained from referring physicians according to the patients' major signs and symptoms. Since the signs and symptoms of CFS and FMS patients completely overlapped, these patients were therefore considered together (CFS/FMS).(1) Blood was collected, shipped over night at 4°C and processed immediately for PCR after purification of DNA using a Chelex procedure.(1,7) Patients' blood was analyzed for the presence of mycoplasmal infections in blood leukocytes. Positive PCR results were confirmed if the PCR product was 717 base pairs in size using the genus-specific primers (or 850 base pairs for M. fermentans specific primers, etc.) along with a positive control of the same size in the same gel, and if a visible band was obtained after hybridization with the internal probe.(15) The sensitivity and specificity of the PCR methods were determined by examining serial dilutions of purified DNA of M. fermentans, M. pneumoniae, M. penetrans, M. hominis and M. genetalium. Amounts as low as 10 fg of purified DNA were detectable for all species using the genus primers. The amplification with genus primers produced the expected fragment size in all tested species, which was confirmed by hybridization with an inner probe.(16)

Mycoplasma tests were performed on all patients as described previously (1,7,17) either from Chelex-purified DNA or DNA prepared from whole blood using a commercial kit. The targeted Mycoplasma spp. sequence was amplified from DNA extracted from the peripheral blood of 144/203 CFS or FMS patients (~70%). In 70 healthy subjects positive results for Mycoplasma spp. were obtained in 6 samples (<9%). The difference between patient and control groups was significant (p<0.001).(17) In addition, two of the 70 controls were positive for M. fermentans. The ratio between positive and negative patients was comparable in female and male patients. These results are quite similar to the results recently published by others.(18) Similarly, using Nucleoprotein Gene Tracking to analyze the blood leukocytes from GWI patients we found that 91/200 (45%) were positive for mycoplasmal infections.(19,20) In contrast, in nondeployed, healthy adults the incidence of mycoplasmal infections was 4/62 (~6%).(19,20)

Patients with FMS or CFS often have multiple mycoplasmal infections and probably other chronic infections as well. When we examined CFS/FMS patients for M. fermentans, M. pneumoniae, M. penetrans, M. hominis infections, multiple infections were found in over one-half of 93 patients (Figure 2). CFS/FMS patients had double (over 30%) or triple (over 20%) mycoplasmal infections, but only when one of the species was M. fermentans or M. pneumoniae.(17) Higher score values for increases in the severity of signs and symptoms were also found in patients with multiple infections. CFS/FMS patients infected with different mycoplasma species generally had a longer history of illness, suggesting that patients may have contracted additional infections with time.(17)

In the course of our studies we found that DNA preparation and blood storage was extremely important in preserving the test samples. Storage of blood frozen or at 0-4°C resulted in reproducible assay results, whereas storage at room temperature resulted in loss of PCR signal over time. Within 1-2 days at room temperature, most of the positive samples reverted to negative results.(1) Also, blood drawn in tubes (blue-top) containing citrate and kept at 0-4°C before the assay yielded better results than other anticoagulants, unless the samples were frozen in EDTA (purple-top) tubes.

Mycoplasmal Infections in Rheumatoid Diseases

The underlying causes of rheumatoid diseases are not known, but RA and other autoimmune diseases could be triggered or exacerbated by infectious agents. It has been known for some time that infectious diseases in some animal species result in remarkable clinical and pathological similarities to RA and other rheumatoid diseases. Aerobic and anaerobic intestinal bacteria, viruses and mycoplasmas have been proposed as important agents in RA.(21) Recently there has been increasing evidence that mycoplasmas may play a role in the initiation or progression of RA.(22) Mycoplasmas have been proposed to interact nonspecifically with B-lymphocytes, resulting in modulation of immunity, autoimmune reactions and promotion of rheumatoid diseases.(23) M. pneumoniae, M. salivarium and U. urealyticum have also been found in the joint tissues of patients with rheumatological diseases, suggesting their pathogenic involvement.(24)

When we examined RA patients' blood leukocytes for the presence of mycoplasmas, we found that approximately one-half were infected with various species of mycoplasmas.(7) The most common species found was M. fermentans, followed by M. pneumoniae and M. hominis and finally M. penetrans. Similar to what we found in CFS/FMS patients, there was a high percentage of multiple mycoplasmal infections in RA patients when one of the species was M. fermentans.(7)

Although the precise role of mycoplasmas in RA and other rheumatoid inflammatory diseases remains unknown, mycoplasmas could be important cofactors in the development of inflammatory responses and for progression of the disease. As an example of the possible role of mycoplasmas in rheumatological diseases, M. arthritidis infections in animals can trigger and exacerbate autoimmune arthritis.(25) This mycoplasma can also suppress T-cells and release substances that act on polymorphonuclear granulocytes, such as oxygen radicals, chemotactic factors, and other substances.(26) Mycoplasmal infections can increase proinflammatory cytokines, such as Interleukin-1, -2, and -6,(27) suggesting that they are involved in the development and possibly progression of rheumatological diseases.

In addition to mycoplasmal infections, other microorganisms have been under investigation as cofactors or causative agents in rheumatological diseases. The discovery of EB virus(28) and cytomegalovirus(29) in the cells of the synovial lining in RA patients suggested their involvement in RA, possibly as a cofactor. There are a number of bacteria and viruses that are candidates in the induction of RA or its progression.(30) In support of bacterial involvement in RA, it has been known for some time that antibiotics like minocycline can alleviate the clinical signs and symptoms of RA.(31) Although this has been proposed to be due to their anti-inflammatory activities, these drugs are likely to be acting to suppress infections of sensitive microorganisms like mycoplasmas.

Mycoplasmal Infections in Immunosuppressive and Autoimmune Diseases

Mycoplasmas have been implicated in the progression of HIV-AIDS. It has been known for some time that some species of mycoplasmas are associated with certain terminal human diseases, such as an acute fatal illness found with certain Mycoplasma fermentans infections in non-AIDS patients.(32) Recently, mycoplasmal infections have attracted attention as a major source of morbidity in AIDS patients. For example, M. fermentans can cause renal and CNS complications in patients with AIDS,(33) and M. penetrans has also been found in the respiratory epithelial cells of AIDS patients.(34) Other species of mycoplasmas have also been found in AIDS patients where they have been associated with disease progression, such as M. prium and M. hominis.(32) Blanchard and Montagnier(35) have proposed that mycoplasmas are cofactors in HIV-AIDS, accelerating progression and accounting, at least in part, for increased susceptibility of AIDS patients to additional infections. In addition to immune suppression, some of this increased susceptibility may be the result of mycoplasma-induced host cell membrane damage from toxic oxygenated products released from intracellular mycoplasmas.(36) Also, mycoplasmas may regulate HIV-LTR-dependent gene expression,(37) suggesting that mycoplasmas may play an important regulatory role in HIV pathogenicity.

There is some preliminary evidence that mycoplasmal infections could be associated with autoimmune diseases. In some mycoplasma-positive GWI cases the signs and symptoms of Multiple Sclerosis (MS), Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig's Disease), Lupus, Graves' Disease and other complex autoimmune diseases have been seen. Such usually rare autoimmune responses are consistent with certain chronic infections, such as mycoplasmal infections, that penetrate into nerve cells, synovial cells and other cell types. These autoimmune signs and symptoms could be caused when intracellular pathogens, such as mycoplasmas, escape from cellular compartments and incorporate into their own structures pieces of host cell membranes that contain important host membrane antigens that can trigger autoimmune responses. Alternatively, mycoplasma surface components ('superantigens') may directly stimulate autoimmune responses,(38) or their molecular mimicry of host antigens may explain, in part, their ability to stimulate autoimmunity.(39)

Mycoplasmal Infections in Other Clinical Conditions

Asthma, airway inflammation, chronic pneumonia and other respiratory diseases are known to be associated with mycoplasmal infections. For example, M. pneumoniae is a common cause of upper respiratory infections,(40) and severe asthma is commonly associated with mycoplasmal infections.(41) Recent evidence has shown that certain mycoplasmas, such as M. fermentans (incognitus strain), are unusually invasive and often found within respiratory epithelial cells.(34)

Heart infections (myocarditis, endocarditis, pericarditis and others) are often due to chronic infections, such as Mycoplasma,(42,43) Chlamydia(44) and possibly other infectious agents.

Other species of mycoplasmas are also associated with various illnesses: M. hominis infections were first found in patients with hypogammaglobulinemia, and M. genitalium was first isolated from the urogenital tracts of patients with nongonococcal urethritis.(45,46) Although mycoplasmas can exist in the oral cavity and gut as normal flora, when they penetrate into the blood and tissues, they may be able to cause or promote a variety of acute or chronic illnesses. These cell-penetrating species, such as M. penetrans, M. fermentans and M. pirum among others, can probably result in complex systemic signs and symptoms. Mycoplasmas are also very effective at evading the immune system, and synergism with other infectious agents can occur.(14) Similar types of chronic infectious agents may occur.(14) Similar types of chronic infections caused by Chlamydia, Brucella, Coxiella or Borrelia may also be present either as single agents or as complex, multiple infections (see Figure 2) in many of the diseases discussed above.

Mycoplasmal Infections --- Treatment Suggestions

Once mycoplasmal infections have been identified in the white blood cell fractions of subsets of CFS, FMS, GWI, RA and other patients, they can be successfully treated. Appropriate treatment with antibiotics should result in patient improvement and even recovery.(6,19,20) The recommended treatments for mycoplasmal blood infections require long-term antibiotic therapy, usually multiple 6-week cycles of doxycycline (200-300 mg/day),(47) ciprofloxacin (1,500 mg/day), azithromycin (500 mg/day) or clarithromycin (750-1,000 mg/day).(48) Multiple cycles are required, because few patients recover after only a few cycles, possibly because of the intracellular locations of mycoplasmas like M. fermentans and M. penetrans, the slow-growing nature of these microorganisms and their relative drug sensitivities. For example, of 87 GWI patients that tested positive for mycoplasmal infections, all patients relapsed after the first 6-week cycle of antibiotic therapy, but after up to 6 cycles of therapy 69/87 patients recovered and returned to active duty.(19,20) The clinical responses that were seen were not due to placebo effects, because administration of some antibiotics, such as penicillins, resulted in patients becoming more not less symptomatic, and they were not due to immunosuppressive effects that can occur with some of the recommended antibiotics. Interestingly, CFS, FMS and GWI patients that slowly recover after several cycles of antibiotics are generally less environmentally sensitive, suggesting that their immune systems may be returning to pre-illness states. If such patients had illnesses that were caused by psychological or psychiatric problems or solely by chemical exposures, they should not respond to the recommended antibiotics and slowly recover. In addition, if such treatments were just reducing autoimmune responses, then patients should relapse after the treatments are discontinued.(1)

Patients with CFS, FMS, RA or GWI usually have nutritional and vitamin deficiencies that must be corrected.(48) These patients are often depleted in vitamins B, C, and E and certain minerals. Unfortunately, patients with these chronic illnesses often have poor absorption. Therefore, high doses of some vitamins must be used, and others, such as vitamin B complex, must be given sublingual. Antibiotics that deplete normal gut bacteria can result in over-growth of less desirable flora, so Lactobacillus acidophillus supplementation is recommended. In addition, a number of natural remedies that boost the immune system are available and are potentially useful, especially during antibiotic therapy or after therapy has been completed.(48) One of us (R.N.) has been involved in the development of ancient African and Chinese natural immune enhancers and cleansers help to restore natural immunity and absorption. Although these products are known to help AIDS patients, their clinical effectiveness in GWI/CFS/FMS/RA patients has not been carefully evaluated. They appear to be useful during therapy to boost the immune system or after antibiotic therapy in a maintenance program to prevent relapses.(48)

Why aren't physicians routinely treating mycoplasmal and other chronic infections? In many cases they are treating these infections, but it has been only recently that such infections have been found in so many unexplained chronic illnesses. These infections cannot be successfully treated with the usual short courses of antibiotics due to their intracellular locations, slow proliferation rates and inherent insensitivity to most antibiotics. In addition, a fully functional immune system may be essential to overcoming these infections, and this is why vitamin and nutritional supplements are so important.

Conclusions

We have proposed that chronic infections are an appropriate explanation for the morbidity seen in a rather large subset of CFS, FMS, GWI and RA patients, and in a variety of other illnesses. Not every patient will have this as a diagnostic explanation or have the same types of chronic infections, and additional research is necessary to clarify the role of such infections in chronic diseases.(1,7) Some patients may have chemical or radiological exposures or other environmental problems as an underlying reason for their chronic signs and symptoms. In these patients, chronic infections may be opportunistic. In others, somatoform disorders or illnesses caused by psychological or psychiatric problems may indeed be important. However, in these patients antibiotics, supplements and immune enhancers should have no lasting effect whatsoever, and they should not recover on such therapies. The identification of specific infectious agents in the blood of chronically ill patients may allow many patients with CFS, FMS, GWI or RA and other chronic diseases to obtain more specific diagnoses and effective treatments for their illnesses. Finally, patients with cardiopathies, AIDS, respiratory illnesses, and urogenital infections are often infected with Mycoplasma, Chlamydia, Brucella or other chronic, invasive bacterial and parasitic infections, and these patients could benefit from appropriate antibiotic and neutraceutical therapies that alleviate morbidity.

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