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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2015 ; 10
(12
): e0144476
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gab.com Text
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English Wikipedia
An Endophytic Fungus, Talaromyces radicus, Isolated from Catharanthus roseus,
Produces Vincristine and Vinblastine, Which Induce Apoptotic Cell Death
#MMPMID26697875
Palem PP
; Kuriakose GC
; Jayabaskaran C
PLoS One
2015[]; 10
(12
): e0144476
PMID26697875
show ga
Endophytic fungi isolated from Catharanthus roseus were screened for the
production of vincristine and vinblastine. Twenty-two endophytic fungi isolated
from various tissues of C. roseus were characterized taxonomically by sequence
analysis of the internal transcribed spacer (ITS) region of rDNA and grouped into
10 genera: Alternaria, Aspergillus, Chaetomium, Colletotrichum, Dothideomycetes,
Eutypella, Eutypa, Flavodon, Fusarium and Talaromyces. The antiproliferative
activity of these fungi was assayed in HeLa cells using the MTT assay. The fungal
isolates Eutypella sp--CrP14, obtained from stem tissues, and Talaromyces
radicus--CrP20, obtained from leaf tissues, showed the strongest
antiproliferative activity, with IC50 values of 13.5 ?g/ml and 20 ?g/ml,
respectively. All 22 endophytic fungi were screened for the presence of the gene
encoding tryptophan decarboxylase (TDC), the key enzyme in the terpenoid indole
alkaloid biosynthetic pathway, though this gene could only be amplified from T.
radicus--CrP20 (NCBI GenBank accession number KC920846). The production of
vincristine and vinblastine by T. radicus--CrP20 was confirmed and optimized in
nine different liquid media. Good yields of vincristine (670 ?g/l) in modified M2
medium and of vinblastine (70 ?g/l) in potato dextrose broth medium were
obtained. The cytotoxic activity of partially purified fungal vincristine was
evaluated in different human cancer cell lines, with HeLa cells showing maximum
susceptibility. The apoptosis-inducing activity of vincristine derived from this
fungus was established through cell cycle analysis, loss of mitochondrial
membrane potential and DNA fragmentation patterns.