Related Experiment Video
Updated: May 9, 2026
08:49
Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
Published on: March 14, 2021
Polyamine metabolism changes in psoriasis.
Valentina Broshtilova1, Valentina Lozanov, Ljubka Miteva
1Departments of Dermatology and Venereology, Faculty of Medicine, Sofia Medical University, Bulgaria.
Indian Journal of Dermatology
|August 7, 2013
Summary
Psoriatic lesions show significantly higher levels of essential polyamines like spermine compared to healthy skin. These findings highlight the role of adenosine methionine decarboxylase (AMDC) in psoriasis pathogenesis.
Area of Science:
- Biochemistry
- Dermatology
- Cell Biology
Background:
- Polyamines (putrescine, spermidine, spermine) are vital for cell growth, differentiation, and apoptosis.
- Scientific evidence points to a key role for polyamines in keratinocyte proliferation and regulation.
Purpose of the Study:
- To investigate polyamine metabolic alterations in benign keratinocytic proliferation, using psoriasis vulgaris as a model.
- To compare polyamine levels in psoriatic lesions, non-lesional psoriatic skin, and healthy control skin.
Main Methods:
- Employed an innovative chromatographic method for precise detection of putrescine, spermidine, and spermine levels.
- Analyzed skin samples from 31 patients with psoriasis vulgaris and 27 healthy controls.
Main Results:
- Psoriatic lesions exhibited a two-fold increase in all measured polyamines compared to non-lesional skin.
- No significant differences in polyamine levels were observed between non-lesional psoriatic skin and healthy control skin.
- Elevated spermine concentrations in lesions correlated with proliferation, suggesting a key role for adenosine methionine decarboxylase (AMDC).
Conclusions:
- Psoriasis does not involve latent changes in polyamine metabolism in non-lesional skin.
- Psoriatic lesions demonstrate significantly elevated levels of key biogenic polyamines.
- The heightened spermine levels underscore the critical role of AMDC in psoriasis-associated polyamine dysregulation, suggesting therapeutic targets.
Related Concept Videos
01:27Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
01:28Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
01:21Overview of Protein Metabolism
Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
01:23Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance
The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
A study on guinea pigs examined the...
A study on guinea pigs examined the...
01:19Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
01:20Sulfur Assimilation
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...