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| Cysteamine is a prescription drug, approved for treating cystinosis -it is not sold over-the-counter as a dietary supplement. -In contrast, related compounds like N-acetylcysteine (NAC) and pantethine are widely available supplements and can indirectly support cysteamine-related pathways (e.g., antioxidant defenses and CoA metabolism). -Pantethine: Precursor to CoA, which breaks down into cysteamine -Pantothenic Acid (Vitamin B5): Required for CoA synthesis -Cysteamine increases glutathione (GSH) levels, reducing oxidative stress, a major contributor to AD pathology. -Some studies suggest that cysteamine increases brain-derived neurotrophic factor (BDNF) levels -Cysteamine has been observed to reduce amyloid plaque burden in animal models of AD. Cysteamine — Cysteamine is a low-molecular-weight aminothiol and cystine-depleting prescription drug approved for nephropathic cystinosis, where it acts through lysosomal thiol-disulfide exchange to reduce cystine accumulation. It is formally classified as an oral small-molecule cystine-depleting agent and endogenous CoA-catabolism-derived aminothiol. Standard abbreviations include cysteamine, cysteamine bitartrate, mercaptamine, and Cyste. It is not an over-the-counter dietary supplement; related pathway-supporting compounds include pantethine, pantothenic acid, and N-acetylcysteine, but these are not equivalent to cysteamine. Primary mechanisms (ranked):
Bioavailability / PK relevance: Cysteamine bitartrate is orally bioavailable, with immediate-release and delayed-release prescription formulations. Delayed-release products are designed for prolonged exposure; reported clinical peak plasma levels are typically in the low micromolar to tens-of-micromolar range, depending on formulation, food timing, and patient context. In-vitro vs systemic exposure relevance: The most translational oncology signal is the GBM anti-invasion/MMP effect reported around micromolar to low sub-millimolar exposure; higher millimolar cytotoxic findings are less likely to be directly achievable systemically and should be treated as high-concentration in-vitro effects. Clinical evidence status: Approved clinical use is for nephropathic cystinosis, not cancer. Oncology evidence is preclinical, mainly in-vitro and mechanistic, with adjunct potential for invasion, migration, redox, and sensitization biology but no established cancer-treatment indication. Cysteamine Cancer Mechanism Matrix
TSF legend: P: 0–30 min R: 30 min–3 hr G: >3 hr AD relevance: Cysteamine and cystamine have moderate mechanistic relevance to neurodegeneration through cysteine/GSH support, NRF2/ARE activation, BDNF modulation, heat-shock response, and mitochondrial stress buffering. For Alzheimer’s disease specifically, the evidence is not clinical proof of disease modification; it is best classified as preclinical or mechanistic neuroprotection extrapolated from neurodegenerative models, with limited direct AD-specific translational support. Primary AD mechanisms (ranked):
Clinical evidence status: AD evidence is preclinical/mechanistic. Cysteamine is not an established AD therapy and should not be entered as clinically validated for AD disease modification. Cysteamine AD Mechanism Matrix
TSF legend: P: 0–30 min R: 30 min–3 hr G: >3 hr |
| Source: TCGA |
| Type: Antiapoptotic |
| Nrf2 is responsible for regulating an extensive panel of antioxidant enzymes involved in the detoxification and elimination of oxidative stress. Thought of as "Master Regulator" of antioxidant response. -One way to estimate Nrf2 induction is through the expression of NQO1. NQO1, the most potent inducer: SFN 0.2 μM, quercetin (2.5 μM), curcumin (2.7 μM), Silymarin (3.6 μM), tamoxifen (5.9 μM), genistein (6.2 μM ), beta-carotene (7.2μM), lutein (17 μM), resveratrol (21 μM), indol-3-carbinol (50 μM), chlorophyll (250 μM), alpha-cryptoxanthin (1.8 mM), and zeaxanthin (2.2 mM) 1. Raising Nrf2 enhances the cell's antioxidant defenses and ↓ROS. This strategy is used to decrease chemo-radio side effects. 2. Downregulating Nrf2 lowers antioxidant defenses and ↑ROS. In cancer cells this leads to DNA damage, and cell death. 3. However there are some cases where increasing Nrf2 paradoxically causes an increase in ROS (cancer cells). Such as cases of Mitochondial overload, signal crosstalk, reductive stress -In some cases, Nrf2 is overexpressed in cancer cells, which can lead to the activation of genes involved in cell proliferation, angiogenesis, and metastasis. This can contribute to the development of resistance to chemotherapy and targeted therapies. -Increased Nrf2 expression: Lung, Breast, Colorectal, Prostrate. Decreased Nrf2 expression: Skine, Liver, Pancreatic. -Nrf2 is a cytoprotective transcription factor which demonstrated both a negative effect as well as a positive effect on cancer - "promotes Nrf2 translocation from the cytoplasm to the nucleus," means facilitates the movement of Nrf2 into the nucleus, thereby enhancing the cell's antioxidant and cytoprotective responses. -Major regulator of Nrf2 activity in cells is the cytosolic inhibitor Keap1. Nrf2 Inhibitors and Activators Nrf2 Inhibitors: Brusatol, Luteolin, Trigonelline, VitC, Retinoic acid, Chrysin Nrf2 Activators: SFN, OPZ EGCG, Resveratrol, DATS, CUR, CDDO, Api - potent Nrf2 inducers from plants include sulforaphane, curcumin, EGCG, resveratrol, caffeic acid phenethyl ester, wasabi, cafestol and kahweol (coffee), cinnamon, ginger, garlic, lycopene, rosemany Nrf2 plays dual roles in that it can protect normal tissues against oxidative damage and can act as an oncogenic protein in tumor tissue. – In healthy tissues, NRF2 activation helps protect cells from oxidative damage and maintains cellular homeostasis. – In many cancers, constitutive activation of NRF2 (often through mutations in NRF2 itself or loss-of-function mutations in KEAP1) leads to an enhanced antioxidant capacity. – This upregulation can promote tumor cell survival by enabling cancer cells to thrive under oxidative stress, resist chemotherapeutic agents, and sustain metabolic reprogramming. – Elevated NRF2 levels have been implicated in promoting tumor growth, metastasis, and resistance to therapy in various malignancies. – High or sustained NRF2 activity is frequently associated with aggressive tumor phenotypes, poorer prognosis, and decreased overall survival in several cancer types. – While its activation is essential for protecting normal cells from oxidative stress, aberrant or sustained NRF2 activation in tumor cells can lead to enhanced survival, therapeutic resistance, and tumor progression. NRF2 inhibitors: (to decrease antioxidant defenses and increase cell death from ROS). -Brusatol: most cited natural inhibitors of Nrf2. -Luteolin: luteolin can reduce Nrf2 activity in specific cancer models and may enhance cell sensitivity to chemotherapy. However, luteolin is also known as an antioxidant, and its influence on Nrf2 can sometimes be context dependent. -Apigenin: certain studies to down‑regulate Nrf2 in cancer cells: Dose and context dependent . -Oridonin: -Wogonin: although its effects might be cell‑ and dose‑specific. - Withaferin A |
| 4333- | Cyste, | Cystamine protects from 3-nitropropionic acid lesioning via induction of nf-e2 related factor 2 mediated transcription |
| - | vitro+vivo, | AD, | NA |
| 6259- | Cyste, | Therapeutic Applications of Cysteamine and Cystamine in Neurodegenerative and Neuropsychiatric Diseases |
| - | Review, | AD, | NA | - | Review, | Park, | NA |
Query results interpretion may depend on "conditions" listed in the research papers. Such Conditions may include : -low or high Dose -format for product, such as nano of lipid formations -different cell line effects -synergies with other products -if effect was for normal or cancerous cells
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