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In vitro and in vivo assessments of Rhodomyrtus tomentosa leaf extract as an alternative anti-streptococcal agent in Nile tilapia (Oreochromis niloticus L.).

Abstract Rhodomyrtustomentosa is a Thai medicinal plant that has been attracting attention for its remarkable antibacterial properties against Gram-positive pathogenic bacteria. The purpose of this study was to evaluate the antibacterial properties of R. tomentosa leaf extract against Streptococcus agalactiae and Streptococcus iniae isolated from infected tilapia.
PMID
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Authors

Mayor MeshTerms
Keywords
Journal Title journal of medical microbiology
Publication Year Start




PMID- 28425874
OWN - NLM
STAT- Publisher
DA  - 20170420
LR  - 20170420
IS  - 1473-5644 (Electronic)
IS  - 0022-2615 (Linking)
DP  - 2017 Apr 21
TI  - In vitro and in vivo assessments of Rhodomyrtus tomentosa leaf extract as an
      alternative anti-streptococcal agent in Nile tilapia (Oreochromis niloticus L.).
LID - 10.1099/jmm.0.000453 [doi]
AB  - PURPOSE: Rhodomyrtustomentosa is a Thai medicinal plant that has been attracting 
      attention for its remarkable antibacterial properties against Gram-positive
      pathogenic bacteria. The purpose of this study was to evaluate the antibacterial 
      properties of R. tomentosa leaf extract against Streptococcus agalactiae and
      Streptococcus iniae isolated from infected tilapia. METHODOLOGY: The
      anti-streptococcal activity of R. tomentosa was determined using broth
      microdilution assays. RESULTS: The extract demonstrated strong antibacterial
      activity against the fish pathogens, with minimum inhibitory concentrations
      (MICs) ranging from 7.862.5 microg ml-1. It was found to possess a dose-dependent
      bacteriostatic effect on this organism. Scanning electron microscopy revealed
      irregular and long chains of swollen cells, as well as corkscrew shapes
      andincomplete separation of cell division of S. agalactiae cells following the
      treatment at sub-MIC. Moreover, S. agalactiae cells pre-treated with the extract 
      became more sensitive to oxidative stress induced by H2O2 than the untreated
      cells. Based on the mortality of Nile tilapia after intraperitoneal infection of 
      S. agalactiae at median lethal dose (LD50), the pre-treated cells caused a
      significant (P<0.01) reduction in mortality of S. agalactiae-infected Nile
      tilapia. CONCLUSION: The results suggested that R. tomentosa could be further
      developed as a simple and effective agent for the treatment of streptococcosis in
      Nile tilapia.
FAU - Na-Phatthalung, Pinanong
AU  - Na-Phatthalung P
AD  - 1Department of Microbiology and Excellence Research Laboratory on Natural
      Products, Faculty of Science and Natural Product Research Center of Excellence,
      Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
FAU - Chusri, Sasitorn
AU  - Chusri S
AD  - 2Faculty of Traditional Thai Medicine, Prince of Songkla University, Hat Yai,
      Songkhla 90112, Thailand.
FAU - Suanyuk, Naraid
AU  - Suanyuk N
AD  - 3Department of Aquatic Science, Faculty of Natural Resources, Prince of Songkla
      University, Hat Yai, Songkhla 90112, Thailand.
FAU - Voravuthikunchai, Supayang Piyawan
AU  - Voravuthikunchai SP
AD  - 1Department of Microbiology and Excellence Research Laboratory on Natural
      Products, Faculty of Science and Natural Product Research Center of Excellence,
      Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
LA  - eng
PT  - Journal Article
DEP - 20170421
PL  - England
TA  - J Med Microbiol
JT  - Journal of medical microbiology
JID - 0224131
EDAT- 2017/04/21 06:00
MHDA- 2017/04/21 06:00
CRDT- 2017/04/21 06:00
AID - 10.1099/jmm.0.000453 [doi]
PST - aheadofprint
SO  - J Med Microbiol. 2017 Apr 21. doi: 10.1099/jmm.0.000453.

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