A Proposed New Model To Explain The Role Of Low Dose Non-DNA Targeted Radiation Exposure in Chronic Fatigue And Immune Dysfunction Syndrome Part 2

Sep 07, 2023

3. Discussion

To assess and compare other potential CFIDS models to the systems model presented herein, we first performed numerous searches, in Pubmed, using the following query terms—Chronic Fatigue and Immune Dysfunction Syndrome disease model, Chronic Fatigue Syndrome disease model, as well as Myalgic Encephalomyelitis disease model. In addition, we reviewed several well-known research-based books on the subject as well as past issues of the Journal of Chronic Fatigue Syndrome [101–103]. We intended to examine the literature for any human pre-existing hierarchical disease models that utilized an integrated macroscopic-microscopic approach for the creation of a potential CFIDS  model.

Cistanche can act as an anti-fatigue and stamina enhancer, and experimental studies have shown that the decoction of Cistanche tubulosa could effectively protect the liver hepatocytes and endothelial cells damaged in weight-bearing swimming mice, upregulate the expression of NOS3, and promote hepatic glycogen synthesis, thus exerting anti-fatigue efficacy. Phenylethanoid glycoside-rich Cistanche tubulosa extract could significantly reduce the serum creatine kinase, lactate dehydrogenase, and lactate levels, and increase the hemoglobin (HB) and glucose levels in ICR mice, and this could play an anti-fatigue role by decreasing the muscle damage and delaying the lactic acid enrichment for energy storage in mice. Compound Cistanche Tubulosa Tablets significantly prolonged the weight-bearing swimming time, increased the hepatic glycogen reserve, and decreased the serum urea level after exercise in mice, showing its anti-fatigue effect. The decoction of Cistanchis can improve endurance and accelerate the elimination of fatigue in exercising mice, and can also reduce the elevation of serum creatine kinase after load exercise and keep the ultrastructure of skeletal muscle of mice normal after exercise, which indicates that it has the effects of enhancing physical strength and anti-fatigue. Cistanchis also significantly prolonged the survival time of nitrite-poisoned mice and enhanced the tolerance against hypoxia and fatigue.

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One such model, created by Englebienne and DeMeirleir, discussed how different onset mechanisms and changes to the immune system could elicit several events and symptoms that would not spontaneously reverse [102]. In their model, the authors discuss the patient onset and/or predisposition factors, such as viral or bacterial infections, that negatively impact the immune system. These bring about various intracellular changes,  such as altered apoptosis, that trigger various biological events, such as T-cell activation and cytokine storm, to ultimately lead to patient symptoms, such as pain and malaise.

From our literature search, we learned that most current CFIDS papers focused on identifying various diagnostic markers or discussed limited functional mechanisms associated with the disease. Given that CFIDS is considered to be a complex multisystem disease that appears to be heterogeneous as a result of its case definition, this has created a tremendous challenge for those researchers and clinicians alike who are left to study and subsequently treat the disease. However, we do believe that multiple patient cohorts may exist that satisfy the current CFIDS case definition and that our system model, which points to intimate involvement of melanoma in some patients, may ultimately prove to be a reflection of this. Furthermore, the consensus is that CFIDS is an immunological disease. In this paper, NK cell cytotoxicity, STAT1, and IFI16 are examples of this. Melanoma is not only one of the most immunogenic cancers but also one of the most effective cancers at subverting host immunity. This may prove to be a critical crossroad,  from an immunological standpoint, that requires much greater scientific effort to gain a true understanding and appreciation for this part of the disease process. As such, additional CFIDS patient research confirming and delineating these mechanisms may be in order, especially given the cancer patient mortality associated with melanoma outcomes in those patients whose detection is delayed. Melanoma’s propensity to metastasize makes early recognition and excision the most important factor in patient survival [104].

Since our system’s model is based on internal radiation exposure, several additional important comments should be taken into consideration. The National Research Council publication Health Effects of Exposure to Low Levels of Ionizing Radiation (BEIR V) states that “the skin has a higher susceptibility to radiation carcinogenesis than has generally been suspected” and, while proposing risk estimates for both basal cell and squamous cell carcinomas, does not mention melanoma [105].

An extensive review of melanoma and ionizing radiation was previously generated by Fink and Bates [106]. Here, the authors examined data from the Canadian Radiation Dose Registry, nuclear industry workers, subjects near nuclear test blasts, survivors of the atomic bombings of Japan, airline pilots and cabin attendants, recipients of medical radiation, and radiological technicians. The authors provided evidence for elevated risks for melanoma related to exposure to ionizing radiation. The 2017 Swiss government-based paper on radon exposure and melanoma, mentioned earlier, is in line with the 2005 paper by Fink and Bates on ionizing radiation exposure and increased melanoma risk. Furthermore, in a  large 29,000+ human study of the effects of external radiation exposure on the mortality of French nuclear workers, among the twenty-one main cancer sites studied, a statistically significant cancer excess was observed only for skin melanoma [107].

Given the possible elevated risk for CFIDS patients to develop melanoma, we suggest the following clinical testing be considered. The first would be to utilize increased skin cancer screenings to improve active surveillance for potential dermatological skin changes in CFIDS patients. Any skin changes should be closely monitored to minimize long-term patient risk for melanoma. Secondly, to utilize the quantitative measurement of Eosinophil Cationic Protein (ECP) in human serum. This test is commercially available in the United States, and it may be available elsewhere. As mentioned previously, ECP is significantly elevated in CFIDS patients, and since it is a prognostic serum marker for melanoma, we encourage its use in these patients. Furthermore, obtaining a baseline measurement in a patient may prove to be a useful addition to a clinician’s diagnostic arsenal as it may assist in monitoring potential disease progression. As such, we firmly believe that these clinical tests may prove to be helpful in CFIDS patients who may be at potential risk for melanoma development.

The fact that the mechanisms described here involve continuous exposure to stress such as UVA radiation, biophotons, radionuclides, etc. suggests that an accelerated aging process, rather than an increased cancer risk, may be associated with CFIDS. Conversely,  some literature data suggest that to potentially lead to a cancer progression, the exposure to stress should be repeated, chronic but with some periods of non-stress to permit cells to propagate errors and to bypass cell cycle arrests. In this regard, research at the CDC has identified premature telomere attrition in CFIDS patients [108]. The telomere length was shorter, and this translated to roughly 10+ years of additional aging in patients. Telomeres,  which act as molecular caps at the ends of chromosomes to protect humans against aging and cancer, have been shown to have a surprising inability to protect themselves against UV radiation [109–111]. Thus, the chromosome’s guardians are susceptible to UV radiation effects, and the damage to telomeres was not repaired. As telomeres shorten,  cells age, deteriorate, and eventually die. As cells divide over a lifetime, telomeres tend to wear down, and the resulting chromosomal instability can potentially lead to an increased cancer risk. Increasing evidence has been gathered that shows that the long-term effects of radiation exposure are due to oxidative changes leading to the continuous accumulation of DNA damage in the progeny of both irradiated and non-irradiated bystander cells and that telomeres are a key player in radiation-induced carcinogenesis [112]. According to a more recent paper by Samuel, ergothioneine has been shown to mitigate telomere shortening under oxidative stress conditions [113]. As such, we suggest additional research, both at the bench and in a clinical setting, to determine the potential utility of the use of L-ergothioneine as a treatment option for CFIDS patients.

Overall, the mechanism that we have proposed here integrates UVA radiation, biophotons, and radionuclides, whose molecular responses obey different kinetics according to the specific DNA damage they induce. For example, the repair of DNA base damage induced by UVA radiation is expected to be faster than that of DNA strand breaks induced by radionuclides. Our question going forward is: How do we best integrate these features into the model as well as the clinical picture in CFIDS patients?

4. Conclusions

This paper presents a new model using systems biology to integrate information from the literature across several systems and several levels of organization to produce a new fundamental model to explain CFIDS etiology, which potentially connects to melanoma development. Through continuous internal radiation exposure caused by internal emitters of ionizing radiation, UV biophotons are liberated. While the model focuses on ionizing radiation due to ingested or inhaled radioactive particles as an example of a possible causative factor for CFIDS, this methodology could also apply to other trigger stressors where elevation of ROS is involved in the disease process. The benefits of this systems model approach are that it helps identify key points in the mechanism where targeted treatment interventions could be possible. Some of these, such as the use of melanin and L-ergothioneine, are actively being researched by our group [16,114–118].

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Author Contributions: A.C.: conceptualization, writing, development of figure; C.S.: Conceptualisation, writing; C.M.: conceptualization, writing drafting figure. All authors have read and agreed to the published version of the manuscript. 

Funding: The research received no external funding. 

Informed Consent Statement: Not applicable. 

Data Availability Statement: Not applicable. 

Conflicts of Interest: The authors declare no conflict of interest. 

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