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Nathan Goodyear

http://pediatrics.aappublications.org/content/pediatrics/136/6/1154.full.pdf - 0 views

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    good review of the physiology behind adolescent PCOS.  Though I hate this term because it treats PCOS as a diagnostic disease when it is simply a metabolically induced hormone balance.
Nathan Goodyear

http://iptq.com/uruguay2004.pdf - 0 views

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    study of IPT finds a reduction in progressive disease and tumor size in IPT + MTX compared to MTX alone, and IPT alone.
Nathan Goodyear

Frontiers | Management of Glioblastoma Multiforme in a Patient Treated With Ketogenic M... - 0 views

  • The SOC for GBM was modified in this patient to initiate KMT prior to surgical resection, to eliminate steroid medication, and to include HBOT as part of the therapy
  • the greatest therapeutic benefit for patients (near 1.0)
  • The observed reduction in blood glucose in our patient would reduce lactic acid fermentation in the tumor cells, while the elevation of ketone bodies would fuel normal cells thus protecting them from hypoglycemia and oxidative stress
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  • Previous studies showed that GBM survival and tumor growth was correlated with blood glucose levels
  • Evidence indicates that glioma cells cannot effectively use ketone bodies for energy due to defects in the number, structure, and function of their mitochondria
  • The accuracy of the GKI as a predictor for therapeutic efficacy, however, is better when ketone bodies are measured from the blood than when measured from the urine
  • A reduction of glucose-driven lactic acid fermentation would not only increase tumor cell apoptosis, but would also reduce inflammation and edema in the tumor microenvironment thus reducing tumor cell angiogenesis and invasion
  • Besides serving as a metabolic fuel for GBM, glutamine is also an essential metabolite for normal immune cells
  • therapies that inhibit glutamine availability and utilization must be strategically employed to avoid inadvertent impairment of immune cell functions
  • we used the non-toxic green tea extract, EGCG, and chloroquine in an attempt to limit glutamine availability to the tumor cells
  • EGCG is thought to target the glutamate dehydrogenase activity that facilitates glutamine metabolism in GBM cells
  • Chloroquine, on the other hand, will inhibit lysosomal digestion thus restricting fermentable amino acids and carbohydrates from phagocytosed materials in the tumor microenvironment
  • HBOT to increase oxidative stress in the tumor cells
  • As glucose and glutamine fermentation protect tumor cells from oxidative stress, reduced availability of these metabolites under ketosis could enhance the therapeutic action of HBOT, as we recently described
  • Prior to subtotal tumor resection and standard of care (SOC), the patient conducted a 72-h water-only fast
  • Following the fast, the patient initiated a vitamin/mineral-supplemented ketogenic diet (KD) for 21 days that delivered 900 kcal/day
  • KD (increased to 1,500 kcal/day at day 22
  • the patient received metformin (1,000 mg/day), methylfolate (1,000 mg/day), chloroquine phosphate (150 mg/day), epigallocatechin gallate (400 mg/day), and hyperbaric oxygen therapy (HBOT) (60 min/session, 5 sessions/week at 2.5 ATA)
  • Biomarkers showed reduced blood glucose and elevated levels of urinary ketones with evidence of reduced metabolic activity (choline/N-acetylaspartate ratio) and normalized levels of insulin, triglycerides, and vitamin D
  • This is the first report of confirmed GBM treated with a modified SOC together with KMT and HBOT, and other targeted metabolic therapies
  • Glioblastoma multiforme (GBM) is the most common and malignant of the primary adult brain cancers
  • less than 20% of younger adults generally survive beyond 24 months
  • glucose and glutamine are the primary fuels that drive the rapid growth of most tumors including GBM
  • Glucose drives tumor growth through aerobic fermentation (Warburg effect), while glutamine drives tumor growth through glutaminolysis
  • The fermentation waste products of these molecules, i.e., lactic acid and succinic acid, respectively, acidify the tumor microenvironment thus contributing further to tumor progression
  • Glucose and glutamine metabolism is also responsible for the high antioxidant capacity of the tumor cells thus making them resistant to chemo- and radiotherapies
  • The reliance on glucose and glutamine for tumor cell malignancy comes largely from the documented defects in the number, structure, and function of mitochondria and mitochondrial-associated membranes
  • These abnormalities cause the neoplastic GBM cells to rely more heavily on substrate level phosphorylation than on oxidative phosphorylation for energy
  • dexamethasone not only increases blood glucose levels but also increases glutamine levels through its induction of glutamine synthetase activity
    • Nathan Goodyear
       
      use mannitol instead
  • Calorie restriction and restricted KD are anti-angiogenic, anti-inflammatory, anti-invasive, and also kill tumor cells through a proapoptotic mechanism
  • Evidence also shows that therapeutic ketosis can act synergistically with several drugs and procedures to enhance cancer management improving both progression free and overall survival
  • hyperbaric oxygen therapy (HBOT) increases oxidative stress on tumor cells especially when used alongside therapies that reduce blood glucose and raise blood ketones
  • The glutamine dehydrogenase inhibitor, epigallocatechin gallate (EGCG) is also proposed to target glutamine metabolism
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    Case study of Glioblastoma treated with ketogenic metabolic therapy as an adjuct to modified standard therapy.
Nathan Goodyear

Ferritin Level Is Positively Associated with Chronic Kidney Disease in Korean Men, Base... - 0 views

  • The overloading of body iron plays a role as an oxidative stressor
  • active radicals can affect lipids, proteins, and deoxyribonucleic acid (DNA), resulting in tissue injury and dysfunction
  • Excess iron causes oxidative stress and induces inflammation, leading to renal disease progression
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  • Serum ferritin levels correlate with total body iron storage and systemic inflammation
  • The level of serum ferritin, an acute phase protein, is increased in an inflammatory environment
  • Previous studies have reported that elevated serum ferritin levels are associated with insulin resistance syndrome, hypertension, dyslipidemia, obesity, and metabolic syndrome as risk factors of CKD
  • elevated serum ferritin levels in hemodialysis patients predict higher mortality
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    great review and study: finds that elevated ferritin levels (> 200 ng/ml in men) was associated with increased chronic kidney disease in Korean study.
Nathan Goodyear

The Single Nucleotide Polymorphism Gly482Ser in the PGC-1α Gene Impairs Exerc... - 0 views

  • Oxidative slow-twitch type I fibres (henceforth briefly called ‘slow fibres’) contain MHC-Iβ. They use oxidative phosphorylation (OXPHOS) to generate ATP and are thus highly fatigue resistant and preferentially activated during endurance exercise. Slow fibres comprise high amounts of mitochondria, myoglobin and lipid droplets, and are well supplied by capillaries
  • there are three types of fast-twitch fibres (types IIA, IID/X, IIB, with the corresponding MHC isoforms IIa, IId/x, IIb) which are all used for rapid high-force generation. Oxidative-glycolytic fast-twitch type IIA fibres have intermediate amounts of mitochondria, lipid droplets and capillaries, and are intermediately resistant to fatigue (as compared to type I and types IIB and IID/X). Glycolytic fast-twitch type IID/X fibres are poor in mitochondria, lipids and capillaries and more susceptible to fatique than type IIA. Glycolytic fast-twitch type IIB fibres have the lowest amounts of mitochondria, lipid droplets and capillaries, but generate the highest contraction velocities
  • Several studies have shown that PGC-1α is upregulated after endurance training
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  • upregulation of PGC-1α expression enhances and/or maintains mitochondrial biogenesis, eventually leading to an increased mitochondrial content of the muscle fibres.
  • PGC-1α also plays an important role in the pathogenesis of insulin resistance and T2D
  • carriers of the Gly482Ser SNP have a reduced cardiorespiratory fitness and a higher risk for metabolic syndrome and T2D
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    Those that carry the risk SNP for Gly482Ser for the PGC-1alpha gene dont' transform type II to type I and thus decrease the effectiveness of aeorbic exercise training, decreased oxidative phosphorylation, decreased lipid oxidation, increased lipid accumulaiton in muscle, and increased risk of IR, obesity, and diabetes.
Nathan Goodyear

Thyroid disorders and polycystic ovary syndrome: An emerging relationship - 0 views

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    good read on the association and common finding of hypothyroid and PCOS--no causation link.
Nathan Goodyear

Epigenetic effects of the pregnancy Mediterranean diet adherence on the offspring metab... - 0 views

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    Review article finds evidenc that Mediterranean diet alters epigenetic expression of child during pregnancy to reduce metabolic syndrome risk.
Nathan Goodyear

Communication between genomic and non-genomic signaling events coordinate steroid hormo... - 0 views

  • steroid hormones typically interact with their cognate receptor in the cytoplasm for AR, glucocorticoid receptor (GR) and PR, but may also bind receptor in the nucleus as appears to often be the case for ERα and ERβ
  • This ligand binding results in a conformational change in the cytoplasmic NRs that leads to the dissociation of HSPs, translocation of the ligand-bound receptor to the nucleus
  • In the nucleus, the ligand-bound receptor dimerizes and then binds to DNA at specific HREs to regulate gene transcription
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  • some steroid hormone-induced nuclear events can occur in minutes
  • the genomic effects of steroid hormones take longer, with changes in gene expression occurring on the timescale of hours
  • Classical steroid hormone signaling occurs when hormone binds nuclear receptors (NR) in the cytoplasm, setting off a chain of genomic events that results in, among other changes, dimerization and translocation to the nucleus where the ligand-bound receptor forms a complex with coregulators to modulate gene transcription through direct interactions with a hormone response element (HRE)
  • NRs have been found at the plasma membrane of cells, where they can propagate signal transduction often through kinase pathways
  • Membrane-localized ER, PR and AR have been reported to modulate the activity of MAPK/ERK, phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt), nitric oxide (NO), PKC, calcium flux and increase inositol triphosphate (IP3) levels to promote cell processes including autophagy, proliferation, apoptosis, survival, differentiation, and vasodilation
  • ERα36, a 36kDa truncated form of ERα that lacks the transcriptional activation domains of the full-length protein. Membrane-localized ERα36 can activate pathways including protein kinase C (PKC) and/or mitogen activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK) to promote the progression of various cancers
  • G protein-coupled receptor 30 (GPR30), also referred to as G protein-coupled estrogen receptor (GPER), is a membrane-localized receptor that has been observed to respond to estrogen to activate rapid signaling
  • hormone-responsive G protein coupled receptor is Zip9, which androgens can activate
  • GPRC6A is another G protein-coupled membrane receptor that is responsive to androgen
  • androgen-mediated non-genomic signaling through this GPCR can modulate male fertility, hormone secretion and prostate cancer progression
  • non-NR proteins located at the cell surface can bind to steroid hormones and respond by eliciting rapid signaling events
  • Estrogens have been shown to induce rapid (i.e. seconds) calcium flux via membrane-localized ER (mER)
  • ER-calcium dynamics lead to activation of kinase pathways such as MAPK/ERK which can result in cellular effects like migration and proliferation
  • 17β-estradiol (E2) has been reported to promote angiogenesis through the activation of GPER
  • Membrane NRs may also mediate rapid signaling through crosstalk with growth factor receptors (GFR)
  • A similar crosstalk occurs between the receptor tyrosine kinase insulin-related growth factor-1 receptor (IGF-IR) and ERα. Not only does IGF-IR activate ERα, but inhibition of IGF-IR downregulates estrogen-mediated ERα activity, suggesting that IGF-IR is essential for maximal ERα signaling
    • Nathan Goodyear
       
      This is a bombshell that shatters the current right brain approach to ER. It completely shatters the concept of eat sugar, whatever you want, with cancer treatment in ER+ or hormonally responsive cancer!
  • Further, ER activates IGF-IR pathways including MAPK
  • GPER is involved in the transactivation of the EGFR independent of classical ER
  • tight interconnection between genomic and non-genomic effects of NRs.
  • non-genomic pathways can also lead to genomic effects
  • androgen-bound AR associates with the kinase Src at the plasma membrane, activating Src which then leads to a signaling cascade through MAPK/ERK
  • However, Src can also increase the expression of AR target genes by the ligand-independent transactivation of AR
  • extranuclear steroid hormone actions can potentially reprogram nuclear NR events
  • estrogen modulated the expression of several genes including endothelial nitric oxide synthase (eNOS) via rapid signaling pathways
  • epigenetic changes can then mediate genomic events in uterine tissue and breast cancer cells
Nathan Goodyear

Topotecan blocks hypoxia-inducible factor-1alpha and vascular endothelial growth factor... - 0 views

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    The chemo agent Topotecan inhibits IGF-1 stimulated VEGF and HIF-1alpha.
Nathan Goodyear

Redox regulation in cancer - 0 views

  • Mitochondrial electron-transport chain and other oxidizing agents are the prime pathways that generate excess ROS in vivo
  • Permanent modification of genetic material resulting from the oxidative damage is one of the vital steps involved in mutagenesis that leads to carcinogenesi
  • The most frequent DNA mutations caused during oxidative stress, initiated by ionizing radiation and other environmental carcinogens are 7,8-dihydro-8-oxoguanine (8-Oxo-G) and Thymine Glycol (TG)
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  • catalase and SOD, GPx, GST
  • insulin like growth factor I, or fibroblast growth factor 2 generates ROS
  • Depletion of GSH increases the sensitivity of cells to ROS
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    The redox reaction in cancer: great read!
Nathan Goodyear

Genetically targeted fractionated chemotherapy - 0 views

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    Good article review on low-dose or fractionated chemotherapy.
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