Last autumn a human study by Iranian researchers found that concentrated pomegranate juice (CPJ) improves lipid profiles in diabetic patients with hyperlipidemia, ie. the presence of excess lipids in the blood. They concluded that CPJ consumption may modify heart disease risk factors in hyperlipidemic patients and therefore its inclusion in their diets may be beneficial.
Additionally, research findings on excess triglyceride accumulation and increased fatty acid oxidation in the diabetic heart, which contribute to cardiac dysfunction, suggested that pomegranate flower extract improves abnormal cardiac lipid metabolism, thereby aiding heart function.
Pomegranate the Anticarcinogenic:
In October, 2005, Australian pop-singer Kylie Minogue, after her own devastating diagnosis for breast cancer, with great positivity helped raise the profile of breast cancer; but we must never forget that men can get this form of cancer too.
It is good to know that, as well as pomegranate's potential non-cytotoxic therapy for leukaemia25 (pomegranate fermented juice, pericarp extracts and 'fatty acids' from seed oil), flavonoid-rich polyphenol fractions from pomegranate fruit have been shown to exert anti-proliferative, anti-invasive, anti-eicosanoid and pro-apoptotic actions in breast and prostate cancer cells and other solid malignancies.
The roseate fruit is exceptional in that various parts of the fruit, eg. seed oil, juice, fermented juice and peel extract have been shown to exert suppressive effects on human breast cancer cells in vitro.
Four years ago, in Korea, in laboratory testings of pomegranate as a chemo-preventive against breast cancer, it was found that pomegranate seed oil had the edge on cancer cell line death (apoptosis), ranging from 90 percent inhibition of proliferation of (MCF-7) at 100 microg/ml medium and other results at 75 percent, and 54 percent apoptosis (cell death) at 50 microg/ml. In another test pomegranate fermented juice polyphenols effected 47 percent inhibition of cancerous lesion formation, suggesting further clinical trials were warranted.
However, more recent American research interest in pomegranate's potential for aiding breast cancers (Summer, 2004) has shown the fruit as an anti-carcinogen to be very useful indeed. In fact, results highlight enhanced breast cancer preventive potential both for a purified compound and for pomegranate seed oil, both greater than that previously reported for pomegranate fermented juice polyphenols.
Prostate cancer:
Prostate cancer is the most common invasive malignancy and the second leading cause of cancer-related deaths among US males, with a similar trend in many Western countries like the UK. In fact, prostate cancer is now the most common cancer diagnosed in UK men. Every year over 30,000 men are diagnosed and 10,000 men die from it.
One approach to control this malignancy is its prevention through the use of agents present in human diet. 'Lifestyle and diet' is important to all areas of health, but recently a randomized, controlled trial involving 93 men with biopsy-proven, untreated prostate cancer, suggested changes in lifestyle and diet can make considerable in-roads into the prevention of prostate cancer in men and even reverse its progression. A good move into changing diet would be for men to drink pomegranate juice.
Although it is early days, a Wisconsin team first tested pomegranate juice with its strong antioxidant and anti-inflammatory properties on laboratory cultures of human prostate cancer cells. They found the extract killed the cancer cells and the higher the dose, the more cells died. Animal testing proved the juice to 'slow' tumour growth. Researchers suggested that pomegranate juice may not only have cancer-protective effects, but also chemotherapeutic effects against prostate cancer in humans. Further research is required, but as a recommendation from man to man it was stated: "It is not too soon to point out that diet is plainly significant in the development of prostate cancer. As there are sound reasons for adopting a healthy diet with generally increased intake of fruit and vegetables, why not consider pomegranate, and its juice, as one of the ways of achieving this."
Pomegranate fruit juice for chemoprevention and chemotherapy of prostate cancer:
Prostate cancer is the most common invasive malignancy and the second leading cause of cancer-related deaths among U.S. males, with a similar trend in many Western countries. One approach to control this malignancy is its prevention through the use of agents present in diet consumed by humans. Pomegranate from the tree Punica granatum possesses strong antioxidant and antiinflammatory properties. We recently showed that pomegranate fruit extract (PFE) possesses remarkable antitumor-promoting effects in mouse skin. In this study, employing human prostate cancer cells, we evaluated the antiproliferative and proapoptotic properties of PFE. PFE (10-100 microg/ml; 48 h) treatment of highly aggressive human prostate cancer PC3 cells resulted in a dose-dependent inhibition of cell growth/cell viability and induction of apoptosis. Immunoblot analysis revealed that PFE treatment of PC3 cells resulted in (i) induction of Bax and Bak (proapoptotic); (ii) down-regulation of Bcl-X(L) and Bcl-2 (antiapoptotic); (iii) induction of WAF1/p21 and KIP1/p27; (iv) a decrease in cyclins D1, D2, and E; and (v) a decrease in cyclin-dependent kinase (cdk) 2, cdk4, and cdk6 expression. These data establish the involvement of the cyclin kinase inhibitor-cyclin-cdk network during the antiproliferative effects of PFE. Oral administration of PFE (0.1% and 0.2%, wt/vol) to athymic nude mice implanted with androgen-sensitive CWR22Rnu1 cells resulted in a significant inhibition in tumor growth concomitant with a significant decrease in serum prostate-specific antigen levels. We suggest that pomegranate juice may have cancer-chemopreventive as well as cancer-chemotherapeutic effects against prostate cancer in humans.
Skin cancer:
On a lighter note, pomegranate is one of the most important botanicals pertaining to dermatologic uses, eg. botanical-based cosmeceuticals. Dermatological scientists have published clinical trials for the treatment of parameters of extrinsic ageing, such as environmental damage. More importantly, topical application of pomegranate fruit extract tested on mouse skin appears to exhibit protective action in skin tumours. Furthermore, pomegranate seed oil has an excellent profile and a couple of years ago topical application for possible skin cancer protective efficacy was investigated. The overall results highlighted the potential of the seed oil as a 'safe' and effective protective agent against skin cancer.
This is excellent news because skin cancer is also one of the most common cancers in the UK and the number of people who get it is increasing. The number of cases has more than doubled since the early 1980s. There are over 69,000 new cases of skin cancer diagnosed each year in the UK; many are not reported so the real number is probably much higher. Over 2,000 people die from skin cancer each year. The significant fact is that there are proportionately more skin cancer deaths in the UK than in Australia, so it is likely there will be even greater interest and research into pomegranate's products coming from that quarter before long.
Cancer of the mouth and oesophagus:
Just as TV Chef Rick Stein is following the canal system of France learning and sampling the delights of fresh regional food, so the cancer curative properties and potential of pomegranate follow the human alimentary canal. Cancer of the mouth, once rare, is increasingly noticeable. Cancer of the oesophagus has a more varied geographical distribution and incidence than any other commonly occurring cancer. Its incidence rate is increasing in many countries, especially among males.
Although oesophageal cancer has been found to be associated with the consumption of alcohol and tobacco, particularly when combined, in the last decade the role of nutrition and diet in the etiology of this disease has attracted worldwide attention, 'Regions with a large incidence of this disease are generally located in poor parts of the world, and their inhabitants share several dietary characteristics. They subsist on a diet high in starch and almost without fresh fruit or vegetables, eat rapidly without sufficient mastication, and consume many foods and drinks such as tea at very high temperatures.
Unfortunately, in the West, diet and eating and drinking habits do in many instances comply with this dietary deficit pattern, but by choice! And again, in a dietary survey carried out as long ago as 1987 ¡®in Mazanderan Province of the Caspian Littoral of Iran, where the inhabitants have the highest rate of esophageal cancer in the world, ¡¬ they drink more tea at a much higher temperature [and] very little fruit and vegetables are consumed by [those] of the high-risk region, whereas inhabitants in the low-risk area keep vegetables and citrus fruits as an important part of their usual diets.
Mouth cancer can affect the lips, tongue, cheeks and throat, which condition is also linked to poor diet! It kills 1,700 people in the UK every year and some 4,300 new cases are diagnosed annually. Men are still twice as likely to develop mouth cancer, but it has also become increasingly common in women in the last 10 years. Whereas previously it was thought that older people were particularly vulnerable to the disease, binge drinking and smoking may be fuelling an increase in mouth cancer among young people.
Anecdotally, in the Middle East, Iran and India, healers use the bark, leaves and skin and rind as well as the edible parts of pomegranate to cure everything from conjunctivitis to haemorrhoids, eg. a paste of the leaves massaged into the scalp is said to reverse baldness. However, it is a boiled infusion of pomegranate rinds that is used to soothe a sore throat. This may give a clue to which way researchers should next advance in investigating pomegranate while looking for a mouth cancer cure.
Near the end of our journey along the alimentary canal, dietary CLA-rich pomegranate seed oil has been found to suppress colon carcinogenesis, which inhibition is associated in part with the increased content of CLA (conjugated linoleic acid) in the colon and liver.
Pomegranate general benefits:
Moving on down the alimentary canal, traditionally anti-diarrhoeal, pomegranate rind extract has been shown to have gastro-protective activity through its antioxidant mechanism.
Mexican researchers tested antibacterial properties of aqueous and methanolic extracts of 26 medicinal plants used in Mexico to treat gastrointestinal disorders against eight different species of entero-pathogens which cause diarrhoea and dysentery: two Escherichia coli species; two Shigella sonnei species; two Shigella flexneri species; and two Salmonella sp. species. Surprise, Surprise! Pomegranate possessed strong antibacterial activity against most of the pathogens tested. Plus, when some 54 plants extracts of importance in the Ayurvedic system of traditional Indian medicine used to treat enteric diseases were screened for their potential against multi-drug resistant Salmonella typhi, pomegranate showed strong antibacterial activity.
Pomegranate is also one of eight plants tested by Australian researchers last year which may provide alternative but bioactive medicines for the treatment of the widespread Escherichia coli O157:H7 infection.43 Indian animal studies have also evaluated the pomegranate seed extract and established it to be effective as an anti-diarrhoeal agent.
With regard to safe usage, in 2003 a Cuban research investigation focused on the toxicity evaluation of the whole pomegranate fruit (hydro-alcoholic) extract, which is used in traditional medicine for the treatment of respiratory diseases, because previous findings on the anti-influenza activity of pomegranate extracts had given support to the ethno-pharmacological application. It was concluded that any toxic effects of Punica granatum fruit extract occurred at higher doses than those effective in the models where the anti-viral activity has been studied or than those doses used in Cuban medicine.
Earlier, when extracts of 13 Brazilian medicinal plants used in Brazilian folk medicine for the treatment of infectious diseases were screened for their antimicrobial activity against bacteria and yeasts, results found pomegranate showed good activity on Staphylococcus aureus bacteria and anti-candidal46A activity was detected. Also, in the early 90s, plants used in Argentine folk medicine screened for antimicrobial activity against Staphylococcus aureus, commonly present on skin and mucous membranes which causes boils and abscesses, showed that pomegranate pericarp (outer rind) extract produced one of the more active results.
In the wake of recent world-shaking disasters, such as the Asian Tsunami , the more recent Katrina hurricane's strike on New Orleans, the September earthquake in Peru and latest large earthquake in Pakistan, the fearful spectre of 'cholera' is always waiting at the gate to claim victims. Peruvian people, in the popular treatment of diarrhoea, use natural products with good success. Accordingly, Peruvian scientists, when testing several plants in vitro on Vibrio cholerae (which causes cholera), found that tea infusion and the decoction of pomegranate peel showed the best bactericidal effect and they suggested it could be used to stop cholera spreading.