Skip to main content

Home/ Seasons Wellness/ Contents contributed and discussions participated by Nathan Goodyear

Contents contributed and discussions participated by Nathan Goodyear

Nathan Goodyear

Long-term stabilization of stage 4 colon cancer using sodium dichloroacetate therapy - 0 views

  • inhibition of mitochondrial pyruvate dehydrogenase kinase
  • inhibition of aerobic glycolysis (the Warburg effect) and activation of mitochondrial potassium ion channels
  • angiogenesis blockade
  • ...5 more annotations...
  • changes in expression of HIF1-α
  • alteration of pH regulators V-ATPase and MCT1, and other cell survival regulators such as PUMA, GLUT1, Bcl2 and p53
  • DCA as a cancer stabilizing agent
  • A protocol of natural medications was developed to address the dose-limiting neurologic toxicity, in collaboration with a naturopathic physician (Andrews). The oral DCA regimen that was developed included three natural medications acetyl L-carnitine[-], R-alpha lipoic acid[-] and benfotiamine[-], for the primary purpose of neuropathy prevention
  • measurable benefits from DCA therapy in 60%-70% of cases
  •  
    Good review of dichloracetate or DCA in antitumor activity.  DCA has been shown to have numerous anticancer properties.
Nathan Goodyear

Medical error-the third leading cause of death in the US | The BMJ - 0 views

  •  
    medical error is the 3rd leading cause of mortality in US.
Nathan Goodyear

Medical education in pharmacogenomics-results from a survey on pharmacogenetic knowledg... - 0 views

  • Of participants, 84.3% found pharmacogenomics relevant to their current practice
  • More than two-thirds (65.7%) did not order nor recommend a pharmacogenomic test in the past year
  • pharmacogenomic testing was understood mainly for assessment of the variability of genes affecting drug disposition, metabolism and drug transport leading to individual responses to drugs
  • ...4 more annotations...
  • Pre-emptive, prospective, genotyping to make individualised drug therapy feasible is seen to contribute to personalised medicine
  • assumed to improve drug efficacy and safety
  • Potential benefits of pharmacogenomics (PGx) have been defined such as predicting intended response to medication by more accurate dosing, avoiding adverse drug reactions and therefore enhancing drug safety and reducing health care cost
  • survey among Dutch pharmacists revealed 14.7% recent users of PGx diagnostics [], whereas in our cohort, the percentage was with 34.3% higher.
  •  
    Doctors and pharmacists are slow to integrate pharmacogenetics. Good working definition of pharmacogenetics as well.
Nathan Goodyear

Germline BRCA mutation and outcome in young-onset breast cancer (POSH): a prospective c... - 0 views

  •  
    New study casts doubt on survival benefit from bilateral mastectomy in women with BRCA1 or BRCA 2 breast cancer.   Of concern also, only 14% of women had genetic testing done with most occurring at the time of diagnosis.  It is very likely that these women had significant family history that could have been identified if genetic testing was performed earlier.  
Nathan Goodyear

Hepatotoxicity of Herbal Supplements Mediated by Modulation of Cytochrome P450 - 0 views

  •  
    awesome review of herbal supplements and CYP450 interactions
Nathan Goodyear

Ibuprofen alters human testicular physiology to produce a state of compensated hypogona... - 0 views

  • The levels of LH in the ibuprofen group had increased by 23% after 14 d of administration
  • This increase was even more pronounced at 44 d, at 33%
  • We found an 18% decrease (P = 0.056) in the ibuprofen group compared with the placebo group after 14 d (Fig. 1A) and a 23% decrease (P = 0.02) after 44 d (Fig. 1C). Taken together, these in vivo data suggest that ibuprofen induced a state of compensated hypogonadism during the trial, which occurred as early as 14 d and was maintained until the end of the trial at 44 d
  • ...27 more annotations...
  • We first investigated testosterone production after 24 and 48 h of ibuprofen exposure to assess its effects on Leydig cell steroidogenesis. Inhibition of testosterone levels was significant and dose-dependent (β = −0.405, P = 0.01 at 24 h and β = −0.664, P < 0.0001 at 48 h) (Fig. 2A) and was augmented over time
  • The AMH data show that the hypogonadism affected not only Leydig cells but also Sertoli cells and also occurred as early as 14 d of administration
  • Sertoli cell activity showed that AMH levels decreased significantly with ibuprofen administration, by 9% (P = 0.02) after 14 d (Fig. 1B) and by 7% (P = 0.05) after 44 d compared with the placebo group
  • Examination of the effect of ibuprofen exposure on both the ∆4 and ∆5 steroid pathways (Fig. 2B) showed that it generally inhibited all steroids from pregnenolone down to testosterone and 17β-estradiol; the production of each steroid measured decreased at doses of 10−5–10−4 M. Under control conditions, production of androstenediol and dehydroepiandrosterone (DHEA) was below the limit of detection except in one experiment with DHEA
  • Measuring the mRNA expression of genes involved in steroidogenesis in vitro showed that ibuprofen had a profound inhibitory effect on the expression of these genes (Fig. 3 BD), consistent with that seen above in our ex vivo organ model. Taken together, these data examining effects on the endocrine cells confirm that ibuprofen-induced changes in the transcriptional machinery were the likely reason for the inhibition of steroidogenesis.
  • Suppression of gene expression concerned the initial conversion of cholesterol to the final testosterone synthesis. Hence, expression of genes involved in cholesterol transport to the Leydig cell mitochondria was impaired
  • A previous study reported androsterone levels decreased by 63% among men receiving 400 mg of ibuprofen every 6 h for 4 wk
  • We next examined the gene expression involved in testicular steroidogenesis ex vivo and found that levels of expression of every gene that we studied except CYP19A1 decreased after exposure for 48 h compared with controls
  • the changes in gene expression indicate that the transcriptional machinery behind the endocrine action of Leydig cells was most likely impaired by ibuprofen exposure.
  • Together, these data show that ibuprofen also directly impairs Sertoli cell function ex vivo by inhibiting transcription
  • ibuprofen use in men led to (i) elevation of LH; (ii) a decreased testosterone/LH ratio and, to a lesser degree, a decreased inhibin B/FSH ratio; and (iii) a reduction in the levels of the Sertoli cell hormone AMH
  • The decrease in the free testosterone/LH ratio resulted primarily from the increased LH levels, revealing that testicular responsiveness to gonadotropins likely declined during the ibuprofen exposure. Our data from the ex vivo experiments support this notion, indicating that the observed elevation in LH resulted from ibuprofen’s direct antiandrogenic action
  • AMH levels were consistently suppressed by ibuprofen both in vivo and ex vivo, indicating that this hormone is uncoupled from gonadotropins in adult men. The ibuprofen suppression of AMH further demonstrated that the analgesic targeted not only the Leydig cells but also the Sertoli cells, a feature encountered not only in the human adult testis but also in the fetal testis
  • ibuprofen displayed broad transcription-repression abilities involving steroidogenesis, peptide hormones, and prostaglandin synthesis
  • a chemical compound, through its effects on the signaling compounds, can result in changes in the testis at gene level, resulting in perturbations at higher physiological levels in the adult human
  • The analgesics acetaminophen/paracetamol and ibuprofen have previously been shown to inhibit the postexercise response in muscles by repressing transcription
  • Previous ex vivo studies on adult testis have indeed pointed to an antiandrogenicity, only on Leydig cells, of phthalates (41), aspirin, indomethacin (42), and bisphenol A (BPA) and its analogs
  • ibuprofen’s effects were not restricted to Leydig and Sertoli cells, as data showed that the expression of genes in peritubular cells was also affected
  • short-term exposure
  • In the clinical setting, compromised Leydig cell function resulting in increased insensitivity to LH is defined as compensated hypogonadism (4), an entity associated with all-cause mortality
  • compensated hypogonadic men present with an increased likelihood of reproductive, cognitive, and physical symptoms
  • an inverse relationship was recently reported between endurance exercise training and male sexual libido
  • AMH concentrations are lower in seminal plasma from patients with azoospermia than from men with normal sperm levels
  • inhibin B is a key clinical marker of reproductive health (32). The function of AMH, also secreted by Sertoli cells, and its regulation through FSH remain unclear in men
  • the striking dual effect of ibuprofen observed here on both Leydig and Sertoli cells makes this NSAID the chemical compound, of all the chemical classes considered, with the broadest endocrine-disturbing properties identified so far in men.
  • after administration of 600 mg of ibuprofen to healthy volunteers
  • 14 d or at the last day of administration at 44 d
  •  
    ibuprofen alters genetic expression that results in decreased Testosterone production.
Nathan Goodyear

The Genetics of Vitamin C Loss in Vertebrates - 0 views

  •  
    The genetics behind the human loss of the ablity to make vitamin C.
Nathan Goodyear

Substantial contribution of extrinsic risk factors to cancer development - 0 views

  • Here we provide evidence that intrinsic risk factors contribute only modestly (<10~30%) to cancer development
  • we conclude that cancer risk is heavily influenced by extrinsic factors. These results carry immense consequences for strategizing cancer prevention
  • cancers are proposed to originate from the malignant transformation of normal tissue progenitor and stem cells
  • ...14 more annotations...
  • “Intrinsic processes” include those that result in mutations due to random errors in DNA replication whereas “extrinsic factors” are environmental factors that affect mutagenesis rates (such as UV radiation, ionizing radiation, and carcinogens
  • intrinsic factors do not play a major causal role.
  • intrinsic cancer risk should be determined by the cancer incidence for those cancers with the least risk in the entire group controlling for total stem cell divisions
  • if one or more cancers would feature a much higher cancer incidence, for example, lung cancer among smokers vs. non-smokers, then this most likely reflects additional (and probably extrinsic) risk factors (smoking in this case)
  • Particularly, for breast and prostate cancers, it has long been observed that large international geographical variations exist in their incidences (5-fold for breast cancer, 25-fold for prostate cancer), and immigrants moving from countries with lower cancer incidence to countries with higher cancer rates soon acquire the higher risk of their new country
  • Colorectal cancer is another high-incidence cancer that is widely considered to be an environmental disease, with an estimated 75% or more colorectal cancer risk attributable to diet
  • melanoma, its risk ascribed to sun exposure is around 65–86%
  • non-melanoma basal and squamous skin cancers, ~90% is attributable to UV
  • 75% of esophageal cancer, or head and neck cancer are caused by tobacco and alcohol
  • HPV may cause ~90% cases in cervical cancer, ~90% cases in anal cancer, and ~70% in oropharyngeal cancer
  • HBV and HCV may account for ~80% cases of hepatocellular carcinoma
  • H pylori may be responsible for 65–80% of gastric cancer
  • While a few cancers have relatively large proportions of intrinsic mutations (>50%), the majority of cancers have large proportions of extrinsic mutations, for example, ~100% for Myeloma, Lung and Thyroid cancers and ~80–90% for Bladder, Colorectal and Uterine cancers, indicating substantial contributions of carcinogen exposures in the development of most cancers
  • onsistent estimate of contribution of extrinsic factors of >70–90% in most common cancer types. This concordance lends significant credibility to the overall conclusion on the role of extrinsic factors in cancer development
  •  
    Really great read.  Cancer is a majority lifestyle disease.
Nathan Goodyear

Endothelium and control of vascular function. State of the Art lecture. - PubMed - NCBI - 0 views

  •  
    vitamin C, absorbed via the endothelium, increases NO.  This will have a positive effect in lowering the blood pressure.
Nathan Goodyear

Vitamin C Pharmacokinetics: Implications for Oral and Intravenous Use | Annals of Inter... - 0 views

  •  
    IV vitamin C found to significantly increased serum levels beyond that of oral.  IV vitamin C is the only route that should be administered for patients with cancer.  IVC at 50 grams showed peak C concentration at 13,400 micromol/L.  Levels of at least 400-600 are required for tumorcidal effects.  In addition, IV vitamin C increased NO release and decreases b/p
Nathan Goodyear

Ascorbic Acid-Induced Modulation of Venous Tone in Humans | Hypertension - 0 views

  •  
    Acute vasodilation with IV vitamin C found to be independent of NO.
Nathan Goodyear

Availability of evidence of benefits on overall survival and quality of life of cancer ... - 0 views

  • Although the goal of cancer treatment is to improve the quantity and quality of life,123 clinical trials designed to gain regulatory approval for new drugs often evaluate indirect or “surrogate” measures of drug efficacy. These endpoints show that an agent has biological activity, but they are not reliable surrogates for improved survival4567891011 or quality of life46111213
  • two recent systematic reviews suggest that the strength of association between surrogates in cancer clinical trials and life extension is generally low
  • Available data from the US show that only a small proportion of cancer treatments approved by the US Food and Drug Administration (FDA) unequivocally show benefits on survival or quality of life.30
  • ...16 more annotations...
  • We sought to systematically evaluate the evidence base for all new drugs and new indications for the treatment of solid tumours and haematological malignancies approved by the EMA in the five year period 2009-13
  • Three investigators (AP, EP, and EG) independently extracted data on and descriptively analysed the following trial features: characteristics of the participant population, study design (randomisation, crossover from experimental to control group, and blinding of investigators and participants), experimental and control groups, enrolment, primary and secondary endpoints, magnitude of benefit on survival and quality of life, and narrative interpretation of the findings
  • Only 18 of the 68 (26%) were supported by a pivotal study powered to evaluate overall survival as the primary outcome
  • From 2009 to 2013, the EMA approved use of 48 oncology drugs
  • Seventeen drugs were approved for treatment of haematological malignancies and 51 for treatment of solid tumours
  • Overall, 72 clinical trials supported the approval of 68 novel drug uses
  • Our scoring was limited to drugs for solid tumours
  • Among 68 cancer drug indications approved by the EMA in the period 2009-13, and with a median of 5.4 years’ follow-up, only 35 (51%) were associated with a significant improvement in survival (26/35) or quality of life (9/35) over existing treatment options, placebo, or as add on treatment
  • Only two of the 26 drugs shown to extend life also showed benefits on quality of life
  • 33 (49%) had not shown any improvement on survival or quality of life
  • This systematic evaluation of oncology drug approvals by the EMA in 2009-13 shows that most of the drugs (39/68, 57%) entered the market without evidence of improved survival or quality of life
  • At a minimum 3.3 years after market entry, there was still no conclusive evidence that 33 of these 39 cancer drugs either extended or improved life
  • What are potential reasons for the paucity of drug approvals with demonstrable survival advantages over existing treatments?
  • Firstly, only 18 (26%) indications for use in our cohort were supported by trials in which extension of life was the primary outcome
  • None of the pivotal studies supporting oncology drug approvals from 2009 to 2013 included quality of life as a primary outcome measure
  • Most new oncology drugs authorised by the EMA in 2009-13 came onto the market without clear evidence that they improved the quality or quantity of patients’ lives
  •  
    New study from European Medicines Agency questions alot of the new cancer drugs brought to the market 2009-2013.  57% of the new drugs (39/68) were brought to the market without evidence of improved survival or quality of life.
Nathan Goodyear

Effect of Distinct Lifestyle Interventions on Mobilization of Fat Storage Pools: The CE... - 0 views

  •  
    low carb mediterranean nutrition out performs low fat diet; but both are not served by following weight number.  MRI shows that fat mobilization of the superior low carb mediterranean nutrition plan is not adequately reflected in weight measurement. 
Nathan Goodyear

Hypercholesterolemia and apolipoprotein B expression: Regulation by selenium status | L... - 0 views

  •  
    study finds selenium and apoB inversely related.
Nathan Goodyear

HUMAN VIRAL ONCOGENESIS: A CANCER HALLMARKS ANALYSIS - 0 views

  • pproximately twelve percent of all human cancers are caused by oncoviruses
  • hepatitis B virus, (HBV) hepatitis C virus (HCV), Epstein Barr Virus (EBV), high-risk Human Papillomaviruses (HPVs), Human T lymphotropic Virus-1 (HTLV-1), HIV and Kaposi’s sarcoma herpesvirus (KSHV)
  •  
    good review of the oncoviruses: EBV, HBV, HCV, HPV, HTLV-1, HIV, and KSHV.  UP to 12% of cancers are caused by oncoviruses
Nathan Goodyear

Vitamin C Improves Endothelium-Dependent Vasodilation by Restoring Nitric Oxide Activit... - 0 views

  •  
    IV Vitamin C improves endothelial vasodilation in essential hypertension.  The Vitamin C reduces the oxygen free radicals which allowed eNOS to increase NO production.  Two take homes: oxygen free radicals may be responsible for the endothelial dysfunction that leads to essential hypertension and vitamin C, particularly IV, can be used to counter this process.  Other studies have shown IV vitamin C to be anti-hypertensive in its action.
Nathan Goodyear

https://www.researchgate.net/profile/Osama_Arafat/publication/234135338_METHYLCOBALAMIN... - 0 views

  •  
    Animal study points to methylB12 as the cause of an increase in adrenal medulla norepinephrine production.  This has significant implications in individuals with hypertension.
Nathan Goodyear

Resurgence of Persisting Non-Cultivable Borrelia burgdorferi following Antibiotic Treat... - 0 views

  • Experimental animal studies have shown that Borrelia burgdorferi, the agent of Lyme borreliosis, consistently establishes persistent infections in a variety of immunocompetent hosts, including laboratory mice [1], white-footed mice (Peromyscus leucopus) [2], [3], [4], rats [5], hamsters [6], guinea pigs [7], gerbils [8], dogs [9], and nonhuman primates, including rhesus macaques (Macaca mulatta) [10] and baboons (Papio spp.
  • With the advent of PCR, and more recently real-time quantitative PCR (qPCR), which offers greater sensitivity and specificity, B. burgdorferi-specific DNA has been found to persist for months following antibiotic treatment in tissues of experimentally infected mice [14], [15], [16], [17], [18], [19], [20], dogs [9], [21] and macaques [22], as well as humans
  • In addition, intact spirochetes have been demonstrated by immunohistochemistry in connective tissue of culture-negative treated mice and within ticks that fed upon them [15], [17] as well as in tissues of and ticks that fed upon treated macaques
  • ...1 more annotation...
  • Results of this study demonstrated not only persistence, but also resurgence of non-cultivable B. burgdorferi in tissues of mice at up to 12 months following antibiotic treatment
  •  
    mouse model using ceftriaxone treatment regimen found that non-cultivatable B. burgdorferia persisted 8+ months post treatment and there was an increase in B. burgdorferi DNA in multiple sites at 12 months.
Nathan Goodyear

Late Disseminated Lyme Disease: Associated Pathology and Spirochete Persistence Post-Tr... - 0 views

  • 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
  • Based on histomorphology, inflammation consisted predominantly of lymphocytes and plasma cells, with rare scattered histiocytes
  • in rare instances, morphologically intact spirochetes were observed in inflamed brain and heart tissue sections from doxycycline-treated animals
  • ...41 more annotations...
  • 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
  • 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
  • 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
  • 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
  • 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
  • We and others have demonstrated the development of a drug-tolerant persister population when B. burgdorferi are treated with antibiotics in vitro
  • The adoption of a dormant or slow-growing phenotype likely allows the spirochetes to survive and re-grow following removal of antibiotic
  • 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
  • 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).
  • 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.
  • Erythema migrans, the clinical hallmark of early localized Lyme disease, was observed in one of the rhesus macaques from this study.
  • 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
  • This study provides evidence that the slow-growing spirochetes which persist after treatment, but are not cultivable in standard growth media may remain viable.
  • The first well-documented indication of Lyme disease (LD) in the United States occurred in the early 1970s
  • Lyme, Connecticut.
  • 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
  • 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
  • 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)
  • ‘post-treatment Lyme disease syndrome’ (PTLDS)
  • host-adapted spirochetes that persist in the tissues, probably in small numbers, inaccessible or impervious to antibiotic
  • inflammatory responses to residual antigens from dead organisms
  • residual tissue damage following pathogen clearance;
  • autoimmune responses, possibly elicited by antigenic mimicry
  • 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
  • Ten male rhesus macaques
  • half (five) of the NHP received antibiotic treatment, consisting of 5 mg/kg oral doxycycline twice per day.
  • Minimal and focal lymphoplasmacytic inflammation
  • inflammation was observed in the leptomeninges overlying a section of temporal cerebral cortex
  • Minimal localized lymphoplasmacytic choroiditis
  • Peripheral nerves contained minimal to moderate lymphoplasmacytic inflammation with a predilection for collagen-rich epineurium and perivascular spaces
  • Inflammation was observed in 56% (5/9) of the NHPs irrespective of treatment group
  • For all animals, inflammation was reserved to perineural tissue
  • The treatment lasted 28 days
  • Minimal to mild lymphoplasmacytic inflammation of either the myocardial interstitium (Figure 2A), pericardium (Figure 2B), or combination therein was observed in 60% of NHPs
  • A single morphologically intact spirochete, as indicated by positive red immunofluorescence (Figure 2C), was observed in the myocardium of one treated animal
  • mild, multifocal lymphoplasmacytic inflammation was observed in one doxycycline-treated animal
  • three animals exhibited minimal to mild lymphoplasmacytic inflammation affecting joint-associated structures
  • 10% to -20% of human patients treated
  • 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)
  • and the rapid clearance of dead spirochetes in a murine model
  • higher doses may be needed to combat neuroborreliosis
  •  
    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.
Nathan Goodyear

ApoB but not LDL-cholesterol is reduced by exercise training in overweight healthy men.... - 0 views

  •  
    exercise in overweight, otherwise healthy men reduced ApoB.
1 - 20 of 6773 Next › Last »
Showing 20 items per page