Database Query Results : Silver-NanoParticles, , BioAv

SNP, Silver-NanoParticles: Click to Expand ⟱
Features:
Silver NanoParticles
Summary:
1. Smaller sizes desirable due to greater surface area, and cell penetration (enhanced permeability and retention (EPR) effect)
2. Two main types: AgNP and silver ions (big debate on uses: Ag+ turning to AgCl in stomach but AgCl also effective. Take sodium-bicarbonate?
3. Dose example 80kg person: 1.12-2mg/day, which can be calculated based on ppm and volume taken (see below) target < 10ppm and 120mL per day (30ppm and 1L per day caused argyria 30mg/day ) (Case Report: 9‐15 ppm@120mL, i.e. 1.1mg/L to 1.8mg/L per day)
Likely 10ppm --> 10mg/L, hence if take 100mL, then 1mg/day? (for Cancer)
The current Rfd for oral silver exposure is 5 ug/kg/d with a critical dose estimated at 14 ug/kg/d for the average person.
Seems like the Cancer target range is 14ug/kg/day to 25ug/kg/day. 80Kg example: 1.12mg to 2mg “1.4µg/kg body weight. If I would have 70kg, I would want to use 100µg/day. However, for fighting active disease, I would tend to explore higher daily dose, as I think this may be too low.”
4. AntiOxidants/NAC can counter act the effect of Silver NanoParticles from producing reactive oxygen species (ROS) and mitochondrial damage . NAC is a supplement form of cysteine, an amino acid that helps make glutathione, a powerful antioxidant.
5. In vitro most reports indicate AgNPs increase ROS in both cancer and normal cell (but in vivo improved antioxidant system of normal may create selectivity)
6. Pathways/mechanisms of action/:
-” intracellular ROS was increased...reduction in levels of glutathione (GSH)”
-”AgNPs affect the function of the vascular endothelial growth factor (VEGF)” (likely reducing levels)
-”expression of BAX and BCL2 genes was increased”
-”upregulation of proapoptotic genes (p53, p21, Bax, and caspases) and downregulation of antiapoptotic genes (Bcl-2)”
-” upregulation of AMPK and downregulation of mTOR, MMP-9, BCL-2, and α-SMA”
-”p53 is a key player...proapoptotic genes p53 and Bax were significantly increased... noticeable reduction in Bcl-2 transcript levels”
-” p53 participates directly in the intrinsic apoptosis pathway by regulating the mitochondrial outer membrane permeabilization”
- “Proapoptotic markers (BAX/BCL-XL, cleaved poly(ADP-ribose) polymerase, p53, p21, and caspases 3, 8 and 9) increased.”
-”The antiapoptotic markers, AKT and NF-kB, decreased in AgNP-treated cells.”

Silver NanoParticles and Magnetic Fields
Summary:
1. “exposure to PMF increased the ability of AgNPs uptake”
2. 6x improvement from AgNPs alone

could glucose capping of SilverNPs work as trojan horse?

Sodium selenite might protect against toxicity of AgNPs in normal cells.

-uncoated AgNPs can degrade the gut microbiome. PVP, citrate, green-synthesized, chitosan coating, may reduce the effect.
Also may be true for Selenium(Sodium selenite) becuase of antioxidant properties, slowing oxidation of Ag0 to Ag+.
co-ingestion with food (higher pH) favors reduction and lower Ag+ levels.
-action mechanisms of AgNPs: the release of silver ions (Ag+), generation of reactive oxygen species (ROS), destruction of membrane structure.

AgNP anticancer effects come from three overlapping mechanisms:
-Nanoparticle–cell interaction (uptake, membrane effects)
-Intracellular ROS generation
-Controlled Ag⁺ release inside cancer cells

Comparison adding Citrate Capping
| Property              | Uncapped AgNPs | Citrate-capped AgNPs |
| --------------------- | -------------- | -------------------- |
| Stability             | Poor           | Excellent            |
| Free Ag⁺              | High           | Low                  |
| Normal cell toxicity  | Higher         | Lower                |
| Cancer selectivity    | Lower          | **Higher**           |
| Mechanism specificity | Crude          | **Targeted**         |
| Storage behavior      | Degrades       | Stable               |



BioAv, bioavailability: Click to Expand ⟱
Source:
Type: measurement
Bioavailability (usually in %) absorbed by the body.
Scientific Papers found: Click to Expand⟱
3579- CUR,  SNP,    Metal–Curcumin Complexes in Therapeutics: An Approach to Enhance Pharmacological Effects of Curcumin
- Review, NA, NA
*IronCh↑, It is well established that curcumin strongly chelates several metal ions, including boron, cobalt, copper, gallium, gadolinium, gold, lanthanum, manganese, nickel, iron, palladium, platinum, ruthenium, silver, vanadium, and zinc.
*BioAv↑, Metal–curcumin complexes increase the solubility, cellular uptake, and bioavailability and improve the antioxidant, anti-inflammatory, antimicrobial, and antiviral effects of curcumin.
*antiOx↑,
*Inflam↓,
*BioAv↑, complexes of curcumin with transition metals may provide another approach to overcome the issues associated with curcumin.
ROS↑, curcumin–metal complexes with liposomes present enhanced cellular uptake and ROS generation in cancer cells and thus cause increased cytotoxicity
*neuroP↑, Since curcumin has the ability to cross the blood–brain barrier due to its hydrophobic nature, it can strongly chelate the metal ions in the brain and prevent metal-induced neurotoxicity.
*eff↑, Curcumin with silver nanoparticle formates also increases the solubility and stability of curcumin in complexes. Curcumin reduces and caps the silver nanoparticles, which increases its stability and solubility in water

4600- SNP,    Effects of particle size and coating on toxicologic parameters, fecal elimination kinetics and tissue distribution of acutely ingested silver nanoparticles in a mouse model
- in-vivo, Nor, NA
*Half-Life↝, Fecal silver began to decline at 12 h for all the AgNPs and was at baseline levels by 48 h.
*toxicity↓, Acute ingestion of AgNP is well-tolerated at high doses, irrespective of size or coating
*Dose↑, The doses utilized in this study (0.1, 1 and 10 mg/kg bw/d) were equivalent to, respectively, 20×, 200× and 2000× the EPA oral reference dose (RfD, 0.005 mg/kg bw/d) for silver
*other↝, Previous estimates of colloidal silver doses associated with clinically evident argyria range between 40× and 700× the oral RfD, although these typically represent repeated exposures
*eff↝, Acute ingestion of AgNP is well-tolerated with concurrent antibiotic administration
*BioAv↓, Oral bioavailability was previously determined as low (4.2%) for a single 10 mg/kg bw dose of 7.9 nm AgNP-citrate in rats

4598- SNP,    In vivo human time-exposure study of orally dosed commercial silver nanoparticles
- in-vivo, Nor, NA
*toxicity∅, concluding no detectable toxicity
*Dose↝, 10 ppm oral silver particle dosing [36 subjects] and 32 ppm oral silver particle dosing [24 subjects]). 100 μg/day for 10 ppm, and 480 μg/day for 32 ppm silver
*Dose↝, corresponding to ionic silver comprising some 84.3% of the total silver content in the product administered orally to patients.
*BioAv↝, Peak serum silver concentration was detected in 42% of subjects in the 14-day 10 ppm dosing showing a mean of 1.6±0.4 mcg/L
*BioAv↝, The 32 ppm dose mean concentration was detected in 92% of subjects at 6.8±4.5 mcg/L
*H2O2∅, No statistically significant change in markers of hydrogen peroxide production or peroxiredoxin protein expression were detected.
*IL8∅, Analysis of IL-8, IL-1α, IL-1β, MCP1 and NQO1 also showed no statistical difference between the active silver and placebo solutions.
*IL1α∅,
*IL1β∅,
*MCP1∅,
*NQO1∅,
*BioAv↓, miniscule (<1%) amounts of 10-nm gold nanoparticles permeate across the gut to enter systemic vascular circulation from the intestine in rodents.51 We assert that silver metallic particle absorption is similar

4595- SNP,    ORAL DELIVERY OF SILVER NANOPARTICLES – A REVIEW
- Review, NA, NA
*BioAv↝, absorption rangesfrom 0.4% to 10% depending at the species, such as 10% and 6% for dogs and monkeys, respectively [31

4594- SNP,  Citrate,    Bioavailability and Toxicokinetics of citrate-coated silver nanoparticles in rats
- in-vivo, Nor, NA
*BioAv↓, bioavailability of orally administered AgNPs was 1.2% in the group treated with 1 mg/kg AgNPs and 4.2% in the group treated with 10 mg/kg AgNPs.

305- SNP,    Activity and pharmacology of homemade silver nanoparticles in refractory metastatic head and neck squamous cell cancer
- Case Report, HNSCC, NA
OS↑, remission
Dose↓, Electron microscopy of AgNP solution revealed bimodal nanoparticle size distribution: 3 and 12 nm.
BioAv↝, basal **silver ion** concentrations of 32 ng/g, rising to 46 ng/g 1 hour after ingesting 60 mL of AgNP solution.
toxicity↓, no toxicities were observed and he had complete radiographic resolution of his cancer
Remission↑,
other↝, patient serum was analyzed and intact nanoparticles were not identified. Thus, we could not isolate the circulating AgNP form
other↝, Analysis of urine showed no AgNP or detectable nanoparticle fragments
other↝, AgNP solution was also exposed to simulated gastric fluid, in which they aggregated into larger nanoparticles according to UV-Vis absorption.
Dose↝, GDH: based on repeat setup, estimated PPM is 20PPM assuming 67% effecient. 1.2mg/60mL (he took 160mL/day
BioAv↝, GDH: chatAI computed the estimated bioavailability at 7%


* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 6

Results for Effect on Cancer/Diseased Cells:
BioAv↝,2,   Dose↓,1,   Dose↝,1,   OS↑,1,   other↝,3,   Remission↑,1,   ROS↑,1,   toxicity↓,1,  
Total Targets: 8

Results for Effect on Normal Cells:
antiOx↑,1,   BioAv↓,3,   BioAv↑,2,   BioAv↝,3,   Dose↑,1,   Dose↝,2,   eff↑,1,   eff↝,1,   H2O2∅,1,   Half-Life↝,1,   IL1α∅,1,   IL1β∅,1,   IL8∅,1,   Inflam↓,1,   IronCh↑,1,   MCP1∅,1,   neuroP↑,1,   NQO1∅,1,   other↝,1,   toxicity↓,1,   toxicity∅,1,  
Total Targets: 21

Scientific Paper Hit Count for: BioAv, bioavailability
6 Silver-NanoParticles
1 Curcumin
1 Citric Acid
Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:153  Target#:792  State#:%  Dir#:%
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