Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Bacterial Toxins

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...

Botulism

Botulism

Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...

Determinants of Bacterial Pathogenicity and Virulence

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...

Production of Antibiotics

Production of Antibiotics

Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...

Production of Pharmaceuticals

Production of Pharmaceuticals

Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...

Tetanus

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Production and Processing Studies to Reduce the Incidence of Salmonellae on Commercial Broilers <sup>1,</sup> <sup>2</sup>.

Journal of food protection·2019

Same author

Comparison of the DNA Probe to Culture Methods for the Detection of Salmonella on Poultry Carcasses and Processing Waters <sup>1</sup>.

Journal of food protection·2019

Same author

Experimental polyradiculitis in monkeys.

Journal of neuropathology and clinical neurology·2014

Same author

Methods for the production of the alpha and theta toxins of Clostridium welchii.

Journal of immunology (Baltimore, Md. : 1950)·2010

Same author

Occurrence and distribution of acid-fast pigment in the central nervous system.

Journal of neuropathology and experimental neurology·2010

Same author

The influence of cholene cystine, and of alpha-tocopherol upon the occurrence of ceroid pigment in dietary cirrhosis of rats.

The Journal of experimental medicine·2010

Search research articles

Related Experiment Video

Updated: Jun 19, 2026

Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples

Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples

Published on: October 18, 2019

FACTORS INVOLVED IN PRODUCTION OF CLOSTRIDIUM WELCHII ALPHA TOXIN.

M H Adams¹, E D Hendee, A M Pappenheimer

¹Department of Bacteriology, New York University College of Medicine, New York.

The Journal of Experimental Medicine

|October 30, 2009

Summary

Maximizing alpha toxin production by Clostridium welchii requires specific nutritional factors beyond basic growth requirements. These include protein digests, pancreatic extracts, and specific carbohydrate sources like starch or dextrin.

Keywords:

BACTERIA/aerogenes capsulatus TOXIN

More Related Videos

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Published on: September 14, 2013

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Published on: December 10, 2016

Related Experiment Videos

Last Updated: Jun 19, 2026

Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples

Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples

Published on: October 18, 2019

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Published on: September 14, 2013

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Published on: December 10, 2016

Area of Science:

Microbiology
Bacterial Toxin Production

Background:

Clostridium welchii is an important pathogen known for producing alpha toxin.
Alpha toxin is a key virulence factor contributing to disease pathology.

Purpose of the Study:

To identify essential nutritional factors required for optimal Clostridium welchii alpha toxin production.
To understand the specific components that enhance alpha toxin yield in vitro.

Main Methods:

Culturing Clostridium welchii in various media formulations.
Supplementing basal media with enzymatic protein digests (casein, gelatine).
Investigating the effect of pancreatic extracts and specific carbohydrates (starch, dextrin) on toxin yield.

Main Results:

Alpha toxin production is significantly enhanced by specific substances in enzymatic protein digests.
Glycerylphosphorylcholine and other pancreatic extract components are crucial for high toxin yields.
Starch or dextrin serve as optimal carbohydrate sources when other fermentable carbohydrates are absent.
Omission of any single identified factor drastically reduces alpha toxin output.

Conclusions:

Optimal Clostridium welchii alpha toxin production necessitates a complex nutritional environment.
Specific supplementation strategies can significantly improve laboratory yields of this important bacterial toxin.