Late Disseminated Lyme Disease: Associated Pathology and Spirochete Persistence Post-Tr... - 0 views
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In this study, we have demonstrated microscopic pathology ranging from minimal to moderate in multiple different tissues previously reported to be involved with LD, including the nervous system (central and peripheral), heart, skeletal muscle, joint-associated tissues, and urinary bladder 12 to 13 months following tick-inoculation of rhesus macaques by Bb strain B31
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Based on histomorphology, inflammation consisted predominantly of lymphocytes and plasma cells, with rare scattered histiocytes
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in rare instances, morphologically intact spirochetes were observed in inflamed brain and heart tissue sections from doxycycline-treated animals
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colocalization of the Bb 23S rRNA probe was not observed in any of the sections of experimental inoculated animals shown to harbor rare persistent spirochetes (Supplemental Figure S1). Previous in vitro work has shown large decreases in Bb rRNA levels when in a stationary phase of growth despite the majority of spirochetes remaining viable
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The possibility that the spirochetes were intact but dead also exists, though this may be unlikely given the precedence for viable but non-cultivable B. burgdorferi post-treatment
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The doxycycline dose utilized in this study (5mg/kg) was based on a previous pharmacokinetic analysis of oral doxycycline in rhesus macaques proven to be comparable to levels achieved in humans and was meant to mimic treatment of disseminated LD
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In addition to the brain of two treated animals, rare morphologically intact spirochetes immunoreactive to OspA were observed in the heart of one treated animal
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Although we did not measure the doxycycline levels in the cerebrospinal fluid, they have been found to be 12% to 15% of the amount measured in serum
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We and others have demonstrated the development of a drug-tolerant persister population when B. burgdorferi are treated with antibiotics in vitro
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The adoption of a dormant or slow-growing phenotype likely allows the spirochetes to survive and re-grow following removal of antibiotic
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The basic premise that antibiotic tolerance may be an adaptation of the sophisticated stringent response required for the enzootic cycle by the spirochetes is described in a recent review as well
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Although current IDSA guidelines recommend intravenous ceftriaxone (2g daily for 30 days) over oral doxycycline for treatment of neuroborreliosis, a randomized clinical trial failed to show any enhanced efficacy of I.V. penicillin G to oral doxycycline for treatment of Lyme neuroborreliosis (no treatment failures were reported in this study of 54 patients).
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we can speculate that the minimal to moderate inflammation that was observed, especially within the CNS and PNS can, in part, explain the breadth of symptoms experienced by late stage Lyme disease patients, such as cognitive impairment and neuralgia.
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Erythema migrans, the clinical hallmark of early localized Lyme disease, was observed in one of the rhesus macaques from this study.
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In 2014, a trailblazing study in mice demonstrated a dramatic decline in B. burgdorferi DNA in the tissues for up to eight months after antibiotic treatment followed by the resurgence of B. burgdorferi growth 12 months after treatment
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This study provides evidence that the slow-growing spirochetes which persist after treatment, but are not cultivable in standard growth media may remain viable.
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The first well-documented indication of Lyme disease (LD) in the United States occurred in the early 1970s
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Lyme, Connecticut.
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Lyme disease is now known to be caused by multiple closely related genospecies classified within the Bb sensu lato complex, representing the most common tick-borne human disease in the Northern Hemisphere
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approximately 30,000 physician-reported cases occur annually in the United States, the annual incidence has been estimated to be 10-fold higher by the Centers for Disease Control and Prevention.6
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Current antibiotic therapy guidelines outlined by the Infectious Disease Society of America (IDSA) are successful in the treatment of LD for the majority of LD patients, especially when administered early in disease immediately following identification of erythema migrans (EM)
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‘post-treatment Lyme disease syndrome’ (PTLDS)
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host-adapted spirochetes that persist in the tissues, probably in small numbers, inaccessible or impervious to antibiotic
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inflammatory responses to residual antigens from dead organisms
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residual tissue damage following pathogen clearance;
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autoimmune responses, possibly elicited by antigenic mimicry
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Experimental studies on immunocompetent mice, dogs, and rhesus macaques have provided evidence for the persistence of Bb spirochetes subsequent to antibiotic treatment in the form of residual spirochetes detected within tissue by IFA and PCR, and recovered by xenodiagnoses
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Ten male rhesus macaques
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half (five) of the NHP received antibiotic treatment, consisting of 5 mg/kg oral doxycycline twice per day.
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Minimal and focal lymphoplasmacytic inflammation
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inflammation was observed in the leptomeninges overlying a section of temporal cerebral cortex
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Minimal localized lymphoplasmacytic choroiditis
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Peripheral nerves contained minimal to moderate lymphoplasmacytic inflammation with a predilection for collagen-rich epineurium and perivascular spaces
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Inflammation was observed in 56% (5/9) of the NHPs irrespective of treatment group
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For all animals, inflammation was reserved to perineural tissue
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The treatment lasted 28 days
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Minimal to mild lymphoplasmacytic inflammation of either the myocardial interstitium (Figure 2Figure 2A), pericardium (Figure 2Figure 2B), or combination therein was observed in 60% of NHPs
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A single morphologically intact spirochete, as indicated by positive red immunofluorescence (Figure 2Figure 2C), was observed in the myocardium of one treated animal
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mild, multifocal lymphoplasmacytic inflammation was observed in one doxycycline-treated animal
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three animals exhibited minimal to mild lymphoplasmacytic inflammation affecting joint-associated structures
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10% to -20% of human patients treated
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Multiple randomized placebo-controlled studies which evaluated sustained antimicrobial therapy concluded that there is no benefit in alleviating patients’ symptoms and indicated that long-term antibiotic therapy may even be detrimental to patients due to potential associated complications (ie, catheter infection and/or clostridial colitis)
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and the rapid clearance of dead spirochetes in a murine model
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higher doses may be needed to combat neuroborreliosis
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persistent borrelia burgdorferia were found in the brain (2) and the heart (1) up to 13 months post standard antibiotic treatment suggesting borrelia burdorferia, the cause of Lyme, can persist in a chronic, persistant state poste acute treatment.
