Soy May Aid In Treating Canine Cancers
Apr. 11, 2009 —
Researchers at North Carolina State University are looking to soy as a
way to make traditional canine cancer therapy more effective, less
stressful for the dog and less costly for the owners.
Dr.
Steven Suter, assistant professor of oncology, and NC State colleagues
studied genistein - a molecule found in soy that has been shown to be
toxic to a wide variety of cancer cells in humans - to determine whether
it would also inhibit the growth of canine lymphoma cells.
The researchers found that a commercially available form of genistein called GCP was effective in killing canine lymphoid cells in a laboratory setting, and that GCP is
"bioavailable" in canines - meaning it is absorbed into the bloodstream
where it can affect cancer cells in the body. The researchers hope that
their findings will lead to the use of GCP for their canine patients in conjunction with traditional cancer treatments like chemotherapy.
The researchers' findings were published in Clinical Cancer Research.
"Humans
have been using soy in conjunction with traditional chemotherapy for
some time as a chemo potentiator," Suter says. "This means that the GCP makes
the chemotherapy work more efficiently and faster, which translates to
less stress on the patient and less money spent on chemotherapy."
Since dogs absorb GCP in
much the same way that humans do, Suter hopes that veterinarians will
be able to offer this therapy to canine patients in the near future.
"Since GCP is
a dietary supplement, it is harmless to patients," he adds. "Plus it's
inexpensive and easy to administer in a pill form. There's really no
downside here."
Soy-Derived Isoflavones Inhibit the Growth of Canine Lymphoid Cell Lines
-GENISTEIN supplements ( google it as canine lymphoma genistein and see what
comes up). Genistein is an isoflavone extracted from soybeans. If you google it
you'll find page after page of promising research --
especially on lymphoma and t-cell lymphoma. Among other things it caused the
death of cancer cells without harming healthy ones. (Something chemo or
radiation DON"T do)
I
found one source so far that is pure genistein costs alot but it is
pure and likely near what researchers use due to dosage and pureness
Swanson now carries one. Yay! Cheaper!
Here is one article:
Abstract
Here is one article:
+ Author Affiliations
- Requests for reprints:
Steven E. Suter, North Carolina State College of Veterinary Medicine, 4700 Hillsborough Street, CVM Research Building #308, Raleigh, NC 27606. Phone: 919-513-0813; Fax: 919-513-7301; E-mail:
Abstract
Purpose: This study aimed to evaluate the in vitro
effects of genistein, both pure genistein and a commercially available
form of genistein called Genistein Combined Polysacharride
(GCP), against two canine B-cell lymphoid cell
lines and determine the oral bioavailability of GCP when fed to normal
dogs.
Experimental Design: The in vitro effect of genistein and GCP was evaluated using cell proliferation and apoptotic assays. The IC50
of both compounds was determined using a
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cell
proliferation
assay and propidium idodide staining. Apoptosis was
evaluated using Annexin V staining, caspase 3 and 9 staining, and DNA
laddering. Cell cycle analysis and Bcl-2/Bax ratios
were also examined. An initial dose escalating pharmacokinetic study
was
used to determine if therapeutic serum levels of
genistein could be reached with oral dosing of GCP in normal dogs.
Results: The 72-hour in vitro IC50
of genistein and GCP against the GL-1 and 17-71 cells were both 10
μg/mL and 20 μg/mL, respectively. GCP led to cell death
in both cell lines via apoptosis and treated cells
exhibited increased Bax:Bcl-2 ratios. The serum concentrations of
genistein
in normal dogs given increasing oral doses of GCP
did not reach the 72-hour in vitro IC50 in a dose escalation study.
Conclusions: The results
of these studies support the notion that canine high-grade B-cell
lymphoma may represent a relevant large animal
model of human non-Hodgkin's lymphoma to
investigate the utility of GCP in chemopreventive and/or treatment
strategies that
may serve as a prelude to human clinical lymphoma
trials.
Translational Relevance
Canine lymphoma has historically been
considered an excellent animal model of a variant of human non-Hodkin's
lymphoma called
diffuse, large B-cell lymphoma. Dogs are large,
long-lived animals that are evolutionarily more closely related to
humans
than rodents; therefore, they represent an
accessible, spontaneous population of high-grade lymphomas occurring in
immunocompetent
animals. Based on a large body of human
literature documenting the antiproliferative effects of genistein, we
hypothesized
that genistein would also have in vitro activity against canine lymphoid cell lines and perhaps in vivo activity in canine lymphoma patients in either chemopreventive or treatment protocols. The results presented here support
our hypothesis that genistein has significant in vitro
antiproliferative activity against two well-established canine B-cell
lines, mirroring human cell line data. Additionally,
we developed an extremely sensitive
high-pressure liquid chromatography–based assay to detect plasma
genistein in dogs fed
a commercially made, highly bioavailable form of
genistein called Genistein Combined Polysacharride (GCP). With this
assay,
we were able to show that genistein in GCP can
be absorbed by canine gut enterocytes, which leads to detectable
genistein
plasma levels. These initial studies with GCP
lay the groundwork for future studies in the setting of canine lymphoma
with
findings that may be directly applicable to
human diffuse large B-cell lymphoma.
Genistein (4, 5, 7-trihydroxyisoflavone) is a readily available isoflavone found in soy-based products. Epidemiologic studies
indicate that consumption of soy-containing diets is associated with a lower incidence of many human tumors (1, 2).
Genistein has been identified as an inhibitor of various protein
tyrosine kinases that play a role in cell growth and apoptosis,
including camp-responsive element-binding protein (3), signal transducers and activators of transcription (4), members of the fork-head-related transcription factors (5), and nuclear factor κB (NF-κB; ref. 6). At pharmacologic concentrations genistein's recorded activities also include topoisomerase I and II inhibition (7), antioxidant activity (8), induced differentiation (9), and deregulation of mitochondrial membrane pore permeability (10).
Genistein's effects on various human solid cancer cell lines have been extensively studied (11). Although the precise molecular mechanisms responsible for these activities are not clearly understood, the compound can
inhibit cancer cell growth (12, 13), induce apoptotic cell death with cell cycle arrest at G2-M phase, and inhibit angiogenesis (14). Genistein causes epigenetic changes in mouse prostate (15) and up-regulates mRNA expression of the BRCA1 tumor suppressor gene during mammary tumorigenesis (16). The compound also inhibits DNA methyltransferase and reverses the methylation status, with concomitant reexpression, of
the p16INK4a, RARb, and MGMT genes in human esophageal squamous cell carcinoma and prostate cell lines (17).
Genistein is also active against human lymphoid neoplasia (18, 19). Genistein induces apoptosis via mitochondrial damage in T lymphoma cells (20) and via Akt signaling in anaplastic large-cell lymphoma (21). The molecule also reduces NF-κb in T lymphoma cells via caspase-mediated cleavage of Iκβα (22). Finally, when included into a CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone) lymphoma protocol, genistein
has growth modulatory effects, via G2-M arrest and decreased NF-κb binding, in a diffuse large B-cell lymphoma xenograft setting (23).
Natural and synthetic genistein glycosides are not easily absorbed across enterocytes in humans and cats (24, 25). Genistein Combined Polysacharride (GCP), a commercially available form of genistein (26), is a complex mixture produced by fermentation of soybean extracts with a mushroom mycelia (Ganoderma lucidum)
culture that contains approximately 40% isoflavones. Fermentation
deglycosylates soy isoflavones, producing aglycone isoflavones
that are highly absorbable across the gut lumen (27). GCP has documented in vitro and in vivo effects on a wide variety of human cancers (28, 29).
Case reports show complete regression of T3 prostate cancer following treatment with GCP (7); and supplementation with GCP prevented recurrence of transitional cell carcinoma (TCC) of the bladder (10).
Case reports show complete regression of T3 prostate cancer following treatment with GCP (7); and supplementation with GCP prevented recurrence of transitional cell carcinoma (TCC) of the bladder (10).
Canine high-grade B-cell lymphoma, which is
similar phenotypically and biologically to the most common variant of
human non-Hodgkin's
lymphoma called diffuse large B-cell lymphoma, is one
of the most common malignant tumors of dogs (up to 25% of all cancers)
and it is the most common hematopoietic tumor of the
dog (83%; ref. 30).
The median survival time of canine B-cell lymphoma patients treated
with CHOP or L-VCAP (asparaginase, vincristine, cyclophosphamide,
adriamycin, prednisone)-based protocols is 12 to 14
months, with an overall cure rate of <10% (31).
Dogs are evolutionarily more closely related to humans than rodents and
are large, long-lived animals; therefore, canine
B-cell lymphoma represents an excellent model to
investigate novel therapeutics and treatment strategies that may have
direct
applicability to the human disease (32).
Based on the similarity between canine
B-cell lymphoma and human diffuse large B-cell lymphoma, we hypothesized
that genistein
would inhibit the cell growth of two well-established
canine lymphoid B-cell lines. We show that genistein induces cell death
via apoptosis at concentrations similar to those
reported in the human literature. We also present our preliminary
findings
of the oral absorption of GCP in domestic dogs.
Soy-derived isoflavones inhibit the growth of canine lymphoid cell ...
by V Jamadar-Shroff - 2009 - Cited by 17 - Related articlesFeb 15, 2009 - EXPERIMENTAL DESIGN: The in vitro effect of genistein and GCP was ... the notion that canine high-grade B-celllymphoma may represent a ...
GCP, a genistein-rich compound, inhibits proliferation and induces ...
by JL McCall - 2010 - Cited by 10 - Related articlesApr 25, 2009 - Genistein combined polysaccharide (GCP), derived from soy bean extract, ... In three human and four caninelymphoid cell lines, GCP inhibited ... GCP may have clinical utility in the treatment of patients with lymphoma. Soy Protein | VCA Animal Hospitals
Genistein is found in other plants as well, including red clover, and is one of the ... The potential benefits of soy proteins indogs and cats are largely ... No similar products for the treatment of lymphoma in animals have yet been developed. Soy May Aid In Treating Canine Cancers - Science Daily
Apr 11, 2009 - Researchers are looking to soy as a way to make traditional canine cancer ... and NC State colleagues studied genistein - a molecule found in soy that has ... whether it would also inhibit the growth of canine lymphoma cells. Genistein combined polysaccharide (GCP) is highly active in both ...
by PC Mack - 2007Genistein combined polysaccharide (GCP) is highly active in both human and canine lymphoma models. P. C. Mack, R. A. Burich, J. L. McCall, M. S. Kent, R. M. ... Watson's Canine Lymphoma Blog
Aug 18, 2009 - A blog about my dog Watson's fight with canine lymphoma. ... of oncology, and NC State colleagues studiedgenistein - a molecule found in soy ... Genistein Combined Polysaccharide (GCP) is ... - Google Books
books.google.com/.../Genistein_Combined_Polysaccharide_GCP_ is.html?... Genistein Combined Polysaccharide (GCP) is Highly Active in Both Human and Canine Lymphoma Models. Front Cover. Jamie Lee McCall. University of ... Soy-derived isoflavones inhibit the growth of canine ... - ResearchGate
The serum concentrations of genistein in normal dogs given increasing oral ... the notion that canine high-grade B-celllymphoma may represent a relevant large ... GCP, a genistein-rich compound, inhibits ... - ResearchGate
www.researchgate.net/.../24360387_GCP_a_genistein-rich_ compound_inhi... In three human and four canine lymphoid cell lines, GCP inhibited ... in vitro efficacy, GCP may have clinical utility in the treatment of patients with lymphoma. 0 0.
**I will be starting genistein on Lucy's cancer on about 4/1/2014. She was diagnosed in 4/2011 and has been taking the Tippner Protocol. I am adding a few new things because while she was in remission using only the pills on the Tippner cancer protocol, she has become stuffy again on the left side. Cancer can adapt and so must the protocol if needed. I will be adding genestein, luteolin, and apigen. I will have a research post on the luteolin and apigen soon. The GCP version of genestein, I am still looking for a source.
Swanson now carries one. Yay! Cheaper!
I buy most of the stuff from Swanson Vitamins. They are cheaper, in capsules for dosage changes, and carry almost everything I give to Lucy except for the Chinese Herbs Stasis Breaker prescription, and the Low Dose Naltrexone prescription. Here is a $5 off coupon link I found