The effects of microencapsulated Lactobacillus casei on tumour cell growth:In vitro and in vivo studies

A. Dwivedi, Nikolitsa Nomikou, Poonam Singh - Nee Nigam, A. McHale

Research output: Contribution to journalArticle

Abstract

It has been known for some time that the micro-milieu of solid tumours provides an ideal environment for growth of facultative and strictly anaerobic bacteria, and it has been shown that certain species including Lactobacillus and Clostridium can colonise those environments leading to regression of tumour growth. Such observations have given rise to the concept of bacteriolytic therapy where live microorganisms might be employed to colonise the tumour and exert a tumorolytic effect. In choosing such an approach, it would be advantageous to exploit a relatively non-pathogenic strain and provide some form of containment that would enable site-specific injection and minimise dispersion of the microorganism throughout the host. In testing the feasibility of such an approach, we prepared microencapsulated formulations of Lactobacillus casei NCDO 161 and demonstrated that conditioned extra-capsular culture media were toxic to tumour cells in vitro. We further investigated the effects of the microencapsulated formulations on tumour growth in vivo following direct intra-tumoural injection. The study demonstrates significant inhibition of tumour growth in vivo by these formulations and suggests potential therapeutic benefit of this approach in the treatment of solid tumours.
LanguageEnglish
Pages293--299
JournalInternational Journal of Medical Microbiology
Volume302
Issue number7-8
DOIs
Publication statusPublished - Dec 2012

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Lactobacillus casei
Growth
Neoplasms
Injections
Anaerobic Bacteria
Clostridium
Poisons
Lactobacillus
In Vitro Techniques
Culture Media
Therapeutics

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title = "The effects of microencapsulated Lactobacillus casei on tumour cell growth:In vitro and in vivo studies",
abstract = "It has been known for some time that the micro-milieu of solid tumours provides an ideal environment for growth of facultative and strictly anaerobic bacteria, and it has been shown that certain species including Lactobacillus and Clostridium can colonise those environments leading to regression of tumour growth. Such observations have given rise to the concept of bacteriolytic therapy where live microorganisms might be employed to colonise the tumour and exert a tumorolytic effect. In choosing such an approach, it would be advantageous to exploit a relatively non-pathogenic strain and provide some form of containment that would enable site-specific injection and minimise dispersion of the microorganism throughout the host. In testing the feasibility of such an approach, we prepared microencapsulated formulations of Lactobacillus casei NCDO 161 and demonstrated that conditioned extra-capsular culture media were toxic to tumour cells in vitro. We further investigated the effects of the microencapsulated formulations on tumour growth in vivo following direct intra-tumoural injection. The study demonstrates significant inhibition of tumour growth in vivo by these formulations and suggests potential therapeutic benefit of this approach in the treatment of solid tumours.",
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The effects of microencapsulated Lactobacillus casei on tumour cell growth:In vitro and in vivo studies. / Dwivedi, A.; Nomikou, Nikolitsa; Singh - Nee Nigam, Poonam; McHale, A.

In: International Journal of Medical Microbiology, Vol. 302, No. 7-8, 12.2012, p. 293--299.

Research output: Contribution to journalArticle

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AB - It has been known for some time that the micro-milieu of solid tumours provides an ideal environment for growth of facultative and strictly anaerobic bacteria, and it has been shown that certain species including Lactobacillus and Clostridium can colonise those environments leading to regression of tumour growth. Such observations have given rise to the concept of bacteriolytic therapy where live microorganisms might be employed to colonise the tumour and exert a tumorolytic effect. In choosing such an approach, it would be advantageous to exploit a relatively non-pathogenic strain and provide some form of containment that would enable site-specific injection and minimise dispersion of the microorganism throughout the host. In testing the feasibility of such an approach, we prepared microencapsulated formulations of Lactobacillus casei NCDO 161 and demonstrated that conditioned extra-capsular culture media were toxic to tumour cells in vitro. We further investigated the effects of the microencapsulated formulations on tumour growth in vivo following direct intra-tumoural injection. The study demonstrates significant inhibition of tumour growth in vivo by these formulations and suggests potential therapeutic benefit of this approach in the treatment of solid tumours.

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