Related Experiment Video
Updated: Feb 14, 2026
09:12
Measuring Deformability and Red Cell Heterogeneity in Blood by Ektacytometry
Published on: January 12, 2018
15.5K
Enzymatic heterogeneity of seminomas
1Department of Virology, National Bacteriological Laboratory, Stockholm, Sweden.
Clinica Chimica Acta; International Journal of Clinical Chemistry
|January 15, 1990
Summary
Seminoma tissues exhibit heterogeneous placental-like alkaline phosphatase (PLAP-like enzyme) with distinct carbohydrate and charge profiles compared to normal testes. These differences highlight molecular variations in PLAP-like enzyme associated with seminoma.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Seminoma is a testicular germ cell tumor.
- Placental-like alkaline phosphatase (PLAP) and its variants are biomarkers in germ cell tumors.
Purpose of the Study:
- To investigate the heterogeneity of PLAP-like enzyme in seminoma.
- To compare the biochemical properties of PLAP-like enzyme in seminoma with normal testicular tissue.
Main Methods:
- Hydrophobicity-based separation of enzymes.
- Lectin affinity chromatography to analyze carbohydrate moieties.
- Isoelectric focusing to assess charge heterogeneity and sialylation.
Main Results:
- PLAP-like enzyme in seminoma showed three distinct fractions based on hydrophobicity, versus two in normal testes.
- Seminoma PLAP-like enzyme displayed additional sugar chains, indicating carbohydrate heterogeneity, though overall glycosylation patterns were similar to normal testis.
- Isoelectric focusing revealed charge differences attributed to sialylation, with significant heterogeneity observed in seminoma PLAP-like enzyme populations.
Conclusions:
- PLAP-like enzyme in seminoma exhibits significant heterogeneity in both carbohydrate structure and charge compared to normal testicular PLAP-like enzyme.
- Differences in sialylation contribute to the observed charge heterogeneity of PLAP-like enzyme in seminoma.
- These findings underscore the molecular complexity of PLAP-like enzyme in seminoma.
Related Concept Videos
01:22Amplifying Signals via Enzymatic Cascade
18.7K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
18.7K
02:50Catalysis
30.8K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.8K
03:35Classifying Matter by Composition
91.8K
Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
91.8K
02:12General Properties of Solutions
36.2K
Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed.
36.2K
00:56What is Glycolysis?
178.3K
Overview
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
178.3K
01:15Pyruvate Oxidation
169.5K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
169.5K