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Microsoft word - stansbury - phytoestrogens references.doc
PHYTOESTROGEN REVIEW Jillian E Stansbury Estrogen and Estrogen Receptor Basics
Estrogens and all steroids play many important physiologic roles in both men and women. Not
only do the estrogens (estradiol, estriol, and estrone) help direct basic sexual characteristics, but
they also affect the central nervous system in terms of masculinization, feminization, and sexual
behavior. In addition, estrogens help regulate follicle-stimulating hormone (FSH) in a feedback
loop, which in turn plays a role in testicular and ovarian development.
Estrogen receptors are also abundant in the bone tissues of both men and women, and estrogen
plays a role in the closure of the epiphyseal plates of long bones during adolescence. Estrogens
also play an important role in the vasculature, where they are involved with vasodilation. Less
understood, but presently under investigation, are the roles that estrogens play in the prostate
gland and in male sexual organ function in general. Estrogen appears important both in the
development as well as the life-long function of fluid formation within the prostate gland and
testes.1 Both deficiencies and excesses of estrogen can affect embryologic development and can
be associated with infertility and other issues of sexual function in men and women.
Alpha and Beta Estrogen Receptors
In addition to there being several forms of estrogen, there are also several types of estrogen
receptors. The alpha subtype of estrogen receptor (ER- ) is most active early in the fetal and
neonatal periods, directing growth and proliferation; while the beta subtype (ER-ß) dominates in
puberty and adulthood where it acts to regulate differentiation of steroid-sensitive cells and
tissues. When the balance between alpha and beta receptors (as well as the balance between
androgens and estrogens) is disrupted, reproductive health is impaired.2 This phenomenon is
referred to as ‘endocrine disruption.’ Steroidal metabolism and signaling may be ‘disrupted’
early in life through exposure to hormonally active compounds. DES (diethylstilbestrol), for
example, is a profound endocrine disruptor and one of the first such chemicals studied.
In addition to steroids themselves, heavy metals, PCBs, pesticides, and numerous other
chemicals are reported to act as endocrine disruptors.3 Exposure to endocrine disruptors during
the fetal and pubertal periods appears especially harmful to steroidal signaling and homeostatic
balances; thus pregnant women and preteens should especially avoid exposure to pollutants and
In tissues possessing both alpha and beta estrogen receptors, the two types seem to counteract
and balance one another. In general, ER- directs cellular proliferation while ER-ß directs
differentiation and apoptosis.4 Intensive research is underway to develop therapies that target
specific subtypes of receptor and are specific to individual tissue types. These therapeutic agents
are referred to as SERMs – selective estrogen response modifiers.
Many phytoestrogens have a higher binding affinity for ER-ß than for ER- . Because more beta
receptors are found on reproductive organs and bone, and more alpha receptors are found on the
vasculature, phytoestrogens are natural SERMs having vast therapeutic potential. Most
phytoestrogens are found to offer benefits for menopausal symptoms and bone density without
carrying the risks of heart disease, coronary artery damage, or peripheral vascular issues.5
Therapies for breast, endometrial, and other hormonally-sensitive cancers have been improved
with the advent of pharmaceutical SERMs (e.g., tamoxifen and raloxifene); and phytoestrogens
are increasingly being researched for cancer as well as for the management of hormonal and
Phytoestrogens and Gene Expression
In addition to direct estrogen-related risk factors, estrogen-driven gene expression phenomena
may also increase the risk of hormonal cancers. Specific genes associated with prostate, breast,
and endometrial cancers may be over- or under-expressed due to altered hormonal balances or
deranged nutritional and physiologic status of the entire biochemical ecosystem.6 For example,
system-wide dominance of certain estrogens or androgens may cause genes associated with those
steroids to be over expressed.7 Androgen-dependant tumors, such as prostate cancer, typically
involve the over-expression of genes coding for the synthesis of androgens in the first place.8
And even more complex, altered pancreatic genes that regulate insulin transcription and over-
expression of choline kinase and certain neuropeptides 9 are being revealed as playing roles in
the development of prostate and hormonal cancers. A normal anti-tumor gene has been
demonstrated to be ‘turned off’ in some situations and is found to be lacking in patients with
prostate cancer and many other types of cancer as well.10 Cadherin genes affect cell-to-cell
communication and adhesion and are found to be involved with prostate cancer and bone
As viruses are known to turn certain genes on and off, they are being investigated as potentially
therapeutic anticancer agents as well as for their causative roles in certain types of cancer. The
human papilloma virus (HPV) is associated with cervical cancer. And the intraprostatic injection
of a certain adenovirus has been explored for men with localized prostate cancer as a means of
stimulating anti-tumor gene expression.12
Phytoestrogen Basics
Isoflavones, coumestans, lignans and their metabolites, flavonoids, and stilbenoids may all be
considered phytoestrogens as they can interact with estrogen receptors, alter gene expression,
and otherwise affect hormones. Isoflavones and coumestans are particularly high in the legume
family, which includes many different edible beans such assoy, lima, lentils, peas, kidney, pinto,
and green beans, and the common medical plants Trifolium, Medicago, and Glycyrrhiza.
The isoflavones include genistein, biochanin A, formononetin, and daidzein, with genistein being
the most active and daidzein the least. Genistein is high in Trifolium, Phaseolus, Glycine, and
Pueraria. Formononetin occurs in Trifolium, Astragalus,13 Pueraria,14 and Glycyrrhiza. Genistin
is the glycoside of genistein and is sometimes mentioned in the literature. Humulus lupulus
contains the prenylated flavanone, 8-prenylnaringenin, confirmed to have ligand activity at
estrogen receptors.15 Pueraria mirifica is rich in phytoestrogens including daidzin. Animal
studies have reported an estrogenic effect from Pueraria.16
Coumestans are reported to have the most pronounced estrogenic effect of all the phytoestrogens.
The most common and most studied coumestan is coumestrol, found in Trifolium, Pisum, Medicago,17 Glycyrrhiza,18 Glycine and especially Brussels sprouts (Brassica oleracea,
Gemmifera group). Coumestans are the least commonly ingested phytoestrogen in the typical
diet. Lespedeza19 and Eclipta prostrata20 are both reported to contain coumestans.
Stilbenoids are being studied for their chemopreventive effects, lipid-lowering and vascular
activities, as enhancers of insulin sensitivity, and as agents to increase lifespan in general.
Resveratrol, the most common and most studied stilbenoid, is found in red wine and other
brightly pigmented fruit juices. Grape (Vitis vinifera) is the most notable source and other berries
also contain stilbenoids. Peanuts (Arachis spp.) contain resveratrol, particularly found in the
papery skin around the nut.21 Pistachios also contain resveratrol. While resveratrol is most often
discussed in terms of its vascular effects (similar to flavonoids), it has some phytoestrogenic
activity as well. Piceid is a metabolite of resveratrol found in the same plant sources as
resveratrol,22 and pterostilbene is another less commonly mentioned stilbene also found in grapes
and berries.23 Morus australis contains the dimeric stilbenes austrafurans B and C.24
Lignans include matairesinol, secoisolariciresinol, lariciresinol, pinoresinol, and their metabolites
desmethylangolensin, enterodiol, enterolactone, and equol. Of all the phytoestrogens, lignans are
the most common in the general diet. Lignans are fiber-like indigestible substances consumed
when eating whole grains, flax seeds, and seedy fruits and vegetables. They are metabolized by
intestinal bacteria into derivatives (e.g., enterolactone, enterodiol, and equol) with increased
phytoestrogenic activity. As has been demonstrated for breast cancer risk, intestinal metabolites
of lignans appear to have a hormone-modulating effect. Because plant lignans are converted into
weakly estrogenic compounds by the intestinal microflora, intestinal dysbiosis can affect
The estrogenic lignan metabolites appear to have beneficial effects on hormone status in the
body by exerting very weak hormonal effects themselves. By competing for binding sites with
the much stronger endogenous and exogenous estrogens, these lignan metabolites may help to
reduce excessive hormonal stimulation on estrogen-sensitive tissues, offering a protective effect
against breast and prostatic cancers.25 Enterolactone is so-named because it is a lactone produced
within the intestines (entero- refers to the gut). Enterolactone has been shown to inhibit the
proliferation of prostate cancer cell lines, induce apoptosis, and favorably alter gene
expression.26 The production of mammalian enterolactone is enhanced by a diet rich in lignans.
The use of antibiotics may abolish the ability of intestinal flora to produce active phytoestrogen
metabolites, and women who use antibiotics repeatedly may incur increased risk of breast cancer
as a result. Smoking and obesity are also associated with a reduction in enterolactone production
while coffee, tea, and of course fiber intake are noted to enhance the production of enterolactone.
Flavonoids
Flavonoids with estrogenic activity abound; among the most commonly studied and discussed
are rutin, catechin, apigenin, kaempferol, luteolin, chrysin and puerarin.27 The isoflavones,
categorized separately in this paper, are closely related to the flavonoids, as are the chalcones
(e.g., isoliquiritigenin). Subtypes of the flavonoids include the flavanones, flavones, and
flavonols, many of which are reported to have estrogenic activity. The various flavonoids and all
of their physiologic activities are too vast and diverse to list. A few examples of plants with
hormonally active flavonoids include Vitex agnus-castus, with its vitexin and penduletin reported
to selectively bind estrogen receptors.28 Pomegranate (Punica granatum) fruits and juice contain
Rutin is found in violets, spinach, rhubarb, buckwheat, parsley, Hydrangea, Sambucus,Tussilago, Amaranthus,30 Indigofera ,31 tomatoes,32 Ilex paraguariensis,33 numerous Ruta
species (for which the compound was named), and many other plants as well. Chrysin occurs in
Passiflora, Scutellaria,34 propolis, and numerous herbs. Apigenin is found in Matricaria, Achillea, Chrysanthemum,Scutellaria, and others. Kaempferol occurs in Gingko,35 Carthamus tinctorius,36 Azadirachta, Pisum, Thespesia, Brassica oleracea, Allium schoenoprasum,
Delphinium consolida, Cuscuta reflexa, and Siparuna apiosyce.Luteolin is found in Thymus,
Aspalathus linearis, Cyperus rotundus, Passiflora incarnata, Swertia pseudochinensis, Vitex polygama,and many other plants.
A Closer Look at Genistein
Genistein is one of the most active and well-studied of the isoflavonoid phytoestrogens. It gets its
name from the Mediterranean leguminous plants Genista morisii and G. ephedroides. Genistein
may affect gene expression due to direct activity at estrogen receptors. Animal studies show that
genistein consumed in the maternal diet can pass in breast milk to nursing infants. Although it
binds both alpha and beta estrogen receptors, genistein is reported to have greater affinity for
ER-ß than for ER- . Favoring the beta receptors over the alpha receptors is believed to reduce
hormonal stimulation and proliferation of hormonally sensitive tissues.
There have been over 4,500 studies on genistein alone describing various hormonal effects.
Around a fifth of these address a variety of anticancer effects. Numerous studies have noted an
amphoteric biphasic effect, where genistein reduces the stimulation of estrogen receptors at some
dosage ranges, but may stimulate them at high dosages; this suggests caution in regards to active
hormonal cancers. For example, one group of researchers reported genistein to promote the
growth of breast cancer cell lines and to interfere with the inhibitory effects of tamoxiphene on
However, genistein has mostly been noted to inhibit hormone-related carcinogenesis in animal
models. It has been shown to inhibit human cancer cell proliferation due to modulation of genes
involved with cell turnover, and to enhance apoptosis of cancer cells. Genistein may also
antagonize estrogen- and androgen-mediated cancer growth, as well as exert anti-angiogenic
effects in cancer lines.38 Genistein and isoflavones also act as aromatase inhibitors.39 Aromatase
is a cytochrome p-450 enzyme family member that converts androgens (androstenedione and
testosterone) into estrogens (estrone and estradiol, respectively); high levels of aromatase
enzymes are associated with breast, adrenal, and prostate cancers (see below).
One human clinical study on women with a family history of breast cancer reported Trifolium
isoflavones to be safe and observed them to exert no proliferative effects on breast or
endometrial tissue.40 Another study investigated blood concentrations of genistein and daidzein
in women with benign proliferative breast conditions, active breast cancer, and age-matched
controls. The study demonstrated an inverse relationship between serum isoflavone levels and
One in vitro study on prostate cancer cells showed genistein to improve the response to radiation
therapy in estrogen-positive cancers. Investigations have reported genistein to have inhibitory
effects on prostate cancer cell lines via antiproliferative activity as well. Genistein inhibits the
proliferation of prostate cells in part due to influencing the expression of steroidal-producing
genes. Genistein is reported to activate several genes associated with tumor suppression and is
one proposed mechanism of protection against prostate cancer. Supplementation with
isoflavones in dosages that exceed typical dietary amounts is noted to slow the progression of
prostate cancer, without noticeable side effects or toxicity.
Current Investigative Methods for Phytoestrogens
• In vitro estrogen receptor binding assays
• Estrogen receptor-related gene activation
• Estrogen’s metabolic enzyme assays
• Estrogen-prompted protein synthesis assays
• Estrogen’s agonistic versus antagonistic receptor effects
• Estrogen’s proliferative or antiproliferative effects on sensitive tissues
• Estrogen’s effect on prepubertal animals
Dietary Phytoestrogens
Although both plant phytoestrogens and pharmaceutical HRT exert effects on the endocrine
system, research overall suggests that unlike synthetic estrogens, phytoestrogens are protective
and beneficial when consumed in whole foods. Rather than disrupting endocrine balance as do so
many synthetic chemicals, normal dietary levels of phytoestrogens appear to have a balancing
One of the theories to explain the significantly lower rates of breast and prostate cancers in Asia
(as compared to the U.S. and Europe) is the frequent consumption of soy products and the
phytoestrogens they contain. For example, when ingested throughout a lifetime, genistein may
offer a protective effect against estrogen-dependant cancers, based on its ability to block the
hyperproliferative activity of more powerful endogenous and exogenous estrogens.43
Animal studies on dietary phytoestrogens
Animal studies show that genistein consumed in the maternal diet is passed to nursing infants in
the breast milk. Prolonged exposure to genistein in early life is reported to reduce the risk of
hormonally related cancers later in life. Research suggests that although they are weakly
estrogenic, phytoestrogens are protective and beneficial when consumed in normal dietary levels,
rather than disruptive to endocrine balance as is the case with many synthetic chemicals.
One mouse study compared the results of a high-phytoestrogen soy feed to a low-phytoestrogen,
soy-free feed on hormonal parameters in offspring. The offspring whose mothers received low-
phytoestrogen feed had higher estradiol levels in general, with early puberty in the females and
larger prostates and smaller testes in the males; while the high-phytoestrogen offspring displayed
healthier reproductive status.44 Furthermore, the low-phytoestrogen group displayed a tendency
to obesity and altered glucose regulation later in life. Researchers have suggested that these
effects become even more pronounced over several generations of similar dietary influences.
High levels of urinary isoflavones are associated with a decreased risk of breast cancer. Although
it is thought that lifelong consumption is most associated with decreased cancer risk, it appears
that inclusion of isoflavones in the diet for as little as one month may alter urinary estrogen
metabolites in a significant and beneficial way.45
Human studies on dietary phytoestrogens
One large, seven-year study followed men with BPH, obtaining diet and lifestyle information
over the years and monitoring for the progression of symptoms over time. Researchers reported
that lycopene, zinc, and supplemental vitamin D appeared to weakly reduce the progression of
BPH, while a diet low in fat and red meat and high in protein and vegetables slowed the
hypertrophy and the emergence of symptoms overall.46
Another study evaluated the effects of year-long supplementation with Trifolium isoflavones on
men with elevated PSA levels. PSA levels were shown to decline by around 30% by the end of
the year without significant alteration of other hormone levels in the body.47
Yet another study treated men with recurrent prostate cancer with isoflavones in the form of a
standardized soy milk, dosed 3 times per day for one year. For nearly all men, serum equol was
increased, and for many men the upward trend of PSA levels was either stabilized or in some
Phytoestrogens and Amphotericism
Amphotericism, an old concept in herbal medicine, embraces the observation that phytoestrogens
appear to balance estrogen in both directions, whether excessive or deficient. Phytoestrogens
(being SERMs) have such varying activity and affinity for different estrogen receptor subtypes in
various tissues that they most certainly could be said to have amphoteric effects in the body. For
example, isoflavones might act as weak estrogen receptor agonists in situations of low
endogenous estrogen, exerting an overall estrogenic effect; yet that weak agonism can compete
with a high endogenous estrogen load to reduce overall estrogenic stimulation in a situation of
hyperestrogenism. While SERM is a term arising out of modern molecular and pharmaceutical
research, amphotericism comes from traditional herbalism. There is research to support the
herbal concept; for example, the inclusion of isoflavones and other phytoestrogens in the diet or
as medicine is noted to treat menopausal symptoms as well as to protect against breast cancer.49
The herbal concept of amphotericism is also echoed by the pharmacologic concept of dose-
dependent curves, also referred to as U (or J or S) curves. In one study involving normal tissue
and hormonal status, low doses of phytoestrogens were reported to be aromatase inhibitors and
to reduce estrogenic activity, while higher doses became estrogenic in net effect displaying a
classic U-shaped curve. Synthetic phytoestrogen-like compounds were also tested and
interestingly displayed no such amphoteric action.50 Phytoestrogens may agonize or antagonize
estrogen receptors to different degrees depending on the estrogen load in the general system.
Phytoestrogens may also affect alpha and beta estrogen receptor subtypes differently, as well as
affecting enzyme subtypes differently under different circumstances.
Phytoestrogens and Estrogen-Sensitive Cancers
As a general rule, the consumption of phytoestrogen-containing plants in the diet or in dietary
supplements appears beneficial. However, in the case of hormonal cancers, it would not be wise
to inundate the body with isoflavones and risk estrogenic stimulation. Small frequent doses, such
as from sipping herbal teas throughout the day or including legumes in the diet, may be safer
than consuming concentrated nutraceutical isoflavones in situations involving active estrogen
While many studies have suggested a chemopreventive effect for genistein, a few have reported
that long-term use may induce chromosomal imbalances that may predispose to breast cancer.51
There is also some evidence that supplementation with genistein could abolish the anti-tumor
effects of tamoxifen in cases of breast cancer.52 Other researchers looked at individual
phytoestrogens – genistein, daidzein, and equol, alone and in combination – and reported that the
combination appears to be safest and to modify the effects of any one phytoestrogen used alone.
Researchers reported that when using whole-food combinations, a binding preference for ER-ß is
observed more so than when using genistein alone.53
Outside of cancer, however, aggressive supplementation with isoflavones might be
appropriate (e.g., with osteoporosis) because isoflavones have also been shown to build bone
The Anticancer Effects of Phytoestrogens
Much of the research on phytoestrogens involves their ability to inhibit the development of
hormonal cancers, an activity known as chemoprevention. Hundreds of studies have shown
phytoestrogens to reduce the proliferative effects of actual human steroids and synthetic
substances on hormonally sensitive tissues. Dietary flavonoids have been classified as
phytoestrogens due to numerous chemoprevention abilities that include hormonal mechanisms.
Research has revealed that not only do isoflavones act as natural SERMs, but they also induce
apoptosis, affect gene expression, and influence various enzyme systems in positive ways – all
mechanisms helping to reduce excessive estrogen stimulation of hormonally sensitive tissues.54
The specific steroidal enzyme systems affected by phytoestrogens include the aromatase,
dehydrogenase, sulphotransferase, and reductase enzymes. Sulphotransferases are involved with
estradiol production and may be over-expressed in many estrogen-dependant cancers.
Phytoestrogens are noted to reduce sulphotransferases when excessive,55 thus reducing hormonal
excess, yet many phytoestrogens offer weak estrogenic effects themselves.
Using genistein as the single most studied example, phytoestrogens exhibit anticancer effects by
a variety of different mechanisms. Genistein is noted to inhibit tyrosine kinase, topoisomerase,
aromatase, dehydrogenase, and other enzymes involved with signal transduction and DNA
replication, transcription, and repair – all potential anticancer mechanisms. Genistein and
daidzein are also reported to induce apoptosis in breast cancer cell lines56 and ovarian cancer cell
Phytoestrogen consumption is associated with a decreased risk of prostate cancer. Genistein is
noted to down-regulate androgen receptors and to limit androgen-stimulated proliferation of the
prostate gland.58 Daidzein also has demonstrated an ability to block the proliferative effects of
testosterone on the prostate in animals.59 Isoflavones have been shown to arrest growth and
induce apoptosis in prostate cancer cells, both in vitro and in vivo.60 Mechanisms of this effect
include inhibition of the dehydrogenase, aromatase, and 5-alpha reductase enzymes.61
The binding of phytoestrogens to ER-ß has been reported to be involved with the prevention of
colorectal cancer.62 ER-ß has been implicated in the development of adenomatous polyps in the
colon and in their cancerous transformation.
Diosmetin is metabolized to luteolin via aromatic demethylation and has been found to be
cytotoxic to breast cancer cell lines.63 Withania somnifera contains unique steroidal lactones
known as withanolides which are credited with reducing inflammatory cytokines and being
Phytoestrogens and Hormone-Metabolizing Enzymes
Aromatase enzymes convert testosterone and progesterone into estrogen, and aromatase
inhibitors therefore will also reduce estrogenic stimulation. Arimidex® is a pharmaceutical
aromatase inhibitor used by patients with breast and uterine cancers. Aromatase is a cytochrome
p-450 enzyme family member that, more specifically, converts androgens (androstenedione and
testosterone) into estrogens (estrone and estradiol, respectively); high levels of aromatase
enzymes are associated with breast, adrenal, and prostate cancers.65 Many such cancers over-
express aromatase enzymes, leading to excessive levels of estrogen. Aromatase enzymes are
abundant in peripheral lipid cells, but have also been found in high amounts in prostate cells
Several groups of phytochemicals have been shown to be natural aromatase inhibitors, with the
flavonoids thought to be the most active. Some companies are attempting to synthesize
aromatase-inhibiting isoflavones, though most herbalists question the logic of this.
In addition to flavonoids, many phytoestrogens such as lignans, coumestrol, and isoflavonoids
are noted to be aromatase inhibitors.67 Coix lacryma-jobi, a barley-like seed, is commonly used
in traditional Chinese medicine for endocrine dysfunction, but has not been well studied. One
recent investigation reported Coix to reduce estradiol due to a variety of mechanisms including
aromatase inhibition.68 White button mushrooms (Agaricus bisporus) have also demonstrated
aromatase inhibition69 and can thereby reduce estrogen levels, and have also been shown to
reduce testosterone-induced cell proliferation in cancer cell lines.70 The activity is thought to be
due to lignans and fatty acids including linoleic acid, an EFA.
Numerous flavonoid molecules have been shown to be aromatase inhibitors. Grape seeds and
juice, red wine, blueberries, pomegranates, and other brightly pigmented plants high in
flavonoids are potent antioxidants and anti-inflammatories; they are also noted to improve
hormonal balance via a variety of mechanisms. The colorless isoflavones, prominent in the
legume family, are also among the widely studied aromatase inhibitors. These are probably best
for prevention of hormonal cancers, but may also be attempted aggressively with dietary and
herbal supplemental measures in cases of hormonally sensitive cancers. Specific to hormonal
cancers, isoflavones have been shown to arrest growth and induce apoptosis in prostate cancer
cells, both in vitro and in vivo.71 The anticancer mechanisms of isoflavones include inhibition of
the dehydrogenase, aromatase, and 5-alpha reductase enzymes. The hydroxyflavanones are one
group of flavonoids that may treat or prevent hormone-dependent cancers.
The 17-beta dehydrogenase (17ß-HSD) family of enzymes contains various isozymes (subtypes)
responsible for either oxidizing and reducing various steroids (both estrogens and androgens),
making them either more or less potent and controlling the amount of active hormones
circulating in the bloodstream. There are at least 15 subtypes of these enzymes; breast cancer,
prostate cancer, and endometriosis have all been shown to involve imbalances of 17-ß
dehydrogenases and the hormones that they regulate. Thus drugs and natural agents that
accelerate the enzymatic inactivation of steroids, or prevent the synthesis of excessive steroids in
the first place, are an important research arena for breast, endometrial, prostate, and other
Many phytoestrogens including flavonoids, isoflavones, coumarins, and coumestans are noted to
inhibit certain 17ß-HSD isozymes in addition to being aromatase inhibitors.73,74,75 Serenoa repens contains phytosterols that may inhibit the conversion of testosterone into the more active
dihydrotestosterone via inhibition of some17ß-HSD isozymes. Licorice (Glycyrrhiza glabra) is
reported to inhibit some of the steroid dehydrogenases, due in part to its glycyrrhetinic acid
Certain 17ß-HSD isozymes are particularly prominent in the breasts and prostate gland where
they play a role in regulating ligand access to androgen and estrogen receptors. Inhibitors of
these isozymes are believed to reduce hormonally stimulated proliferation of tissues and thereby
5 -reductase is the enzyme that converts testosterone into the more active dihydrotestosterone.
Because dihydrotestosterone is noted to have increased stimulatory and proliferative effects on
the prostate gland compared to testosterone, inhibition of this enzyme is a present therapy in the
management of prostate enlargement and cancer. Finasteride (Prosgar®) is a synthetic
pharmaceutical used for this purpose. Genes that control 5 -reductase in the prostate are induced
by high-fat diets and inhibited by genistein.77 Serenoa repens, Pygeum africanum, Urtica spp.
and green tea (Camellia sinensis) catechins are botanical agents found to inhibit 5 -reductase
activity.78 Serenoa is noted to inhibit tumorigenesis and to induce apoptosis in animal models of
prostate cancer.79 One study showed the combination of astaxanthin with Serenoa to inhibit
prostate cancer more than Serenoa alone.80 Human investigations have supported the ability of
Serenoa to inhibit 5 -reductase and reduce circulating levels of active testosterone.81 A review of
18 randomized controlled trials on the effects of Pygeum africanum versus placebo on subjective
and objective BPH symptoms summarized that Pygeum appeared useful and warranted further
Common black pepper (Piper nigrum) has been found to be a 5 -reductase inhibitor.83,84
Cubebin, a lignan found in many types of pepper, is credited with some of the physiologic
activity; and piperine, a major alkaloid of black peppercorns, has been shown to be anti-
androgenic via 5 -reductase inhibition when tested in isolation. The pepper leaf as well as the
corns displays inhibition of the reductase enzymes.85 Piper cubeba has also been found to down-
regulate androgen receptors in general.86 As male-pattern baldness is also associated with the
activity of this enzyme, Piper extracts are being explored as potential oral and topical therapy for
Numerous common and medicinal mushrooms are notedto have anticancer effects as well as 5 -
reductase inhibiting activity. One study reported Ganoderma lucidum to be the strongest
reductase inhibitor of ten mushrooms tested.87
Neuroprotection and Phytoestrogens
Many phytoestrogens are also reported to be neuroprotective. Soy, for example, is observed to
protect the brain from damage in experimental models of stroke. Individual soy phytoestrogens
including genistein, daidzein, and the metabolite equol were all found to protect the brain from
glutamate toxicity via activity at estrogen receptors.88
Estrogen is believed to have positive effects on cognition, improving memory and particularly
verbal skills. The isoflavone group of phytoestrogens weakly bind estrogen receptors and one
clinical trial reported soy supplementation to improve women’s performance of a memory
exercise.89 Isoflavones are believed to have a protective activity for women at risk of Parkinson’s
disease by having neuroprotective effects on dopaminergic neurons.90
Menopausal Therapy and Phytoestrogens
Isoflavones from soy are probably the most studied phytochemicals for improving bone density
and treating menopausal symptoms.91 Isoflavones from Trifolium have been shown to improve
bone density, tissue integrity, and vaginal blood flow.92 Although black cohosh (Actaea racemosa) was reported in earlier studies to contain the isoflavone formononetin, contemporary
analyses have not been able to detect this compound in the plant; therefore, other constituents
must be responsible for its ability to alleviate hot flashes and improve bone density.93
Vascular Effects
There are estrogen receptors on blood vessels that play roles in vasodilation, amongst other
things. Metabolic syndrome may have a relationship to estrogen in that insulin, C-reactive
protein, and leptin all respond to changes in estrogen levels in the body. Phytoestrogens are
known to improve cholesterol and lipids and may be therapeutic to metabolic syndrome.94Medicago sativa phytoestrogens are believed to have beneficial activities on the vasculature such
as hyperlipidemic effects.95 The animal studies on dietary phytoestrogens (previously cited) also
noted a protection from hyperlipidemia and metabolic syndrome. Phytoestrogens may also affect
blood cells themselves and thereby have immune effects. Many are noted to improve white blood
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