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Journal of Pharmacognosy and Phytochemistry 2017; 6(1): 424-429
E-ISSN: 2278-4136
P-ISSN: 2349-8234
JPP 2017; 6(1): 424-429
Received: 24-11-2016
Accepted: 25-12-2016
Dr. Neethu S Kumar
Assistant Professor, Post
Graduate Department and
Research Centre of Botany,
Mahatma Gandhi College,
Thiruvananthapuram,
Kerala, India
Sreeja Devi PS
Post Graduate and Research
Centre, Department of Botany,
Mahatma Gandhi College,
Kesavadasapuram,
Thiruvananthapuram, Kerala,
India
Correspondence
Dr. Neethu S Kumar
Assistant Professor, Post
Graduate Department and
Research Centre of Botany,
Mahatma Gandhi College,
Thiruvananthapuram,
Kerala, India
The surprising health benefits of papaya seeds: A
review
Dr. Neethu S Kumar, Sreeja Devi PS
Abstract
The study mainly focused on the secret behind the papaya seed against cancer. Papaya (Carica papaya
Linn.) is well known for its exceptional nutritional and medicinal properties throughout the world. The
whole plant including its fruit, leaves, seed, root, bark, juice and latex obtain from papaya plant used as
nutritionally, medicinally and for various other purposes. A papaya in vitro study shows that it will treat
many cancer cell line and papaya physiochemical having anticancer activities. Papaya is rich in enzyme
papain which is effective against cancer. Papain breaks down the fibrin cancer cell wall and protein into
amino acid form. Other than papain it also contain lycopene which highly reactive towards oxygen and
free radical. Isothiocyanate contained in papaya seed, work well for colon, breast, lung, leukemia and
prostrate cancer. These enzymes capable of inhibiting both formation and development of cancer cell.
Keywords: Papain, Lycopene, anticancer
1. Introduction
Papaya belongs to a small family caricaceae having four genera in world. The genus carica L.
is represented by four species in India, of which Carica papaya L. is the most widely
cultivated and the best-known species (Jean et al., 2011) [24]. It is commonly known as Papaya
Melon tree, Pawpaw or Papau, Kapaya, Lapaya, Papyas, Papye, Tapayas, Fan mu gua, papita,
arand- kharpuja, papayabaum and papaya (Bhattachrjee, 2001) [10]. The taxonomical
classification includes Kingdom (Plantae), Order (Brassicales), Family (Caricaceae), Genus
(Carica) and Species (papaya). Papaya is probably originated in southern Mexico and Costa
Rica, subsequently got introduced in Australia, Hawaii, Philippines, Sri Lanka, South Africa,
India and all tropical and subtropical regions. It is growing both commercially and in home
garden (Marotta et al., 2006) [32]. A study conducted by University of Florida researchers Nam
Dang and colleagues in Japan has documented papaya’s powerful anticancer properties and its
impact on numerous lab-grown-tumors.
The papaya seed contain fatty acids, crude protein, crude fibre, papaya oil, carpaine, caricin,
glucotropaeolin, benzyl glucosinolates, benzyl Isothiocyanate, benzyl thiourea, hentriacontane,
ß-sitostrol, caressing and an enzyme myrosin. The seeds and the pulp of Carica papaya
contain benzyl glucosinolate which can be hydrolyzed by myrosinase to produce benzyl
isothiocyanate. Seed extracts have profound bactericidal activity. The seeds of unripe fruits are
rich in benzyl isothiocyanate, a sulphur containing chemical that has been reported to be an
effective germicide and insecticide. These substances are important for plant natural defense
mechanisms (El Moussaoui et al., 2001) [16]. Medicinal uses of papaya seed are carminative,
anti-fertility agent in males, counter irritant, as a paste in the treatment of ringworm, psoriasis,
emmenagogue, vermifuge, liver cirrhosis and abortifacient. Seed juice is used for bleeding
piles, enlarged liver and pectoral properties. Seed paste is used as anthelmintic, stimulation of
menstruation or abortion.
Carica papaya seeds were approved and confirmed in some studies for their effective
anthelmintic properties against nematodes found in animals (Chota A., 2010) [13]. Chinoy et
al., (2006) [12] proved the anti-fertility, anti-implantation and abortifacient properties of
extracts from papaya seeds. It has been established in males that the seeds of C. papaya are
potential anti-fertility drugs (Lohiya et al., 2005) [30]. Pawpaw seeds are used to produce an
indigenous Nigerian food condiment called ‘daddawa’, the Hausa word for a fermented food
condiment (Dakare, 2004) [15]. Fermented seeds have no effects on litters of rats (Abdulazeez
et al., 2009) [1], whereas, those effects were apparent when the unfermented extract was
administered (Abdulazeez, 2008) [2]. Anthelmintic activity of papaya seed has been
predominantly attributed to carpaine (an alkaloid) and carpasemine (later identified as benzyl
thiourea). Carpaine has an intensively bitter taste and a strong depressant action on health.
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Journal of Pharmacognosy and Phytochemistry
It is present not only in papaya fruit and seed but also in its
leaves. Benzyl isothiocyanate (BITC), the main bioactive
compound in C. papaya seeds (Kermanshai et al., 2001) [25]
has been shown to be responsible for the anti-fertility effect
(Adebiyi et al., 2003) [4]. BITC is capable of damaging the
endometrium, making the uterus non-receptive and, thus,
affecting adversely the implantation (Adebiyi et al., 2003) [4].
Seeds are also a rich source of amino acids; scented oil was
extracted, used in treatment of sickle cell disease and
poisoning related disorders (Saran and Choudhary, 2013)
[45,46]. Papain is used in food processing to tenderize meat,
clarify beer and juice, produce chewing gum, coagulate milk,
prepare cereals, and produce pet food, also to treat wool and
silk before dying, de-hair hides before tanning, adjunct in
rubber manufacturing and proteolytic enzymes (papain and
chymopapain). Papaya seeds are rich source of amino acids
especially in the sarcotesta. A yellow to brown, faintly
scented oil was extracted from the sundried, powdered seeds
of unripe papayas at the Central Food Technological Research
Institute, Mysore, India. White seeds yielded 16.1% and black
seeds 26.8% and it was suggested that the oil might have
edible and industrial uses. Air dried papaya seeds with honey
showed significant effect on human intestinal parasites
without significant side effect. Consumption of papaya seed is
cheap, natural, harmless, readily available, mono-therapeutic
and prevent against intestinal parasitosis especially in tropical
communities.
Under diverse agro-climatic conditions of North Bihar, the
autumn sown crop is best suited for seed production (Ram and
Ray, 1992; Singh et al., 2010) [42, 48]. Quality seed production
suffer from several limiting factors including physiological
disorders. Different nutrient deficiencies of boron, zinc and
sulphur and environmental stresses cause several
physiological disorders such as bumpy fruit which may lead
to deformed/discolored seeds. Discolored seeds, vivipary
seeds (Saha, 2007; Saran et al., 2013a) [44] and white seeds
(disturbed sarcotesta) were identified as new physiological
disorders of papaya under diverse agro-climatic conditions of
India. During seed development period, proper temperature
also plays an important role. Keeping a fore-mentioned facts
in mind, the present study was conducted on the varietal
screening for bumpiness; morphology and economics of
bumpy fruits, deformed/discolored seeds, vivipary and white
seeds (disturbed sarcotesta) and relationship between
temperature and disorders (deformed seed and vivipary).
Increasing anecdotal reports of its effects in cancer treatment
and prevention, with many successful cases, have warranted
that these pharmacological properties be scientifically
validated. A bibliographic search was conducted using the
key words "papaya", "anticancer", and "antitumor" along with
cross-referencing. No clinical or animal cancer studies were
identified and only seven in vitro cell-culture-based studies
were reported; these indicate that C. papaya extracts may alter
the growth of several types of cancer cell lines. However,
many studies focused on specific compounds in papaya and
reported bioactivity including anticancer effects. This review
summarizes the results of extract-based or specific compound-
based investigations and emphasizes the aspects that warrant
future research to explore the bioactives in C. papaya for their
anticancer activities.
According to the Journal of Ethno pharmacology published on
the 17th of February, 2010, international doctors and
researchers from US and Japan have discovered that enzymes
found in Papaya Leaf Tea have dramatic cancer-fighting
properties against a broad range of tumors. A study conducted
by University of Florida researchers Nam Dang and
colleagues in Japan has documented papaya’s powerful
anticancer properties and impact numerous lab-grown-tumors.
Another important use of the papaya seed could prevent or
possibly even treat food poisoning. The seeds of papaya are
believed to have strong anti-bacterial and anti-inflammatory
effect on our digestive system. Studies have shown that an
extract made from papaya seed is effective in killing E.coli,
Salmonella, Staphylococus and other dangerous bacterial
infections. There are even reports of using papaya seeds to
successfully treating viral infections such as Dengue fever in
parts of Central America like Costa Rica.
2. Anti-amoebic activity
The study suggested that the cold macerated aqueous extract
of matured papaya seeds (100 µ/mL) showed significant anti-
amoebic activity against Entamoeba histolytica.
3. Anti-ulcer activity
Aqueous seed extract of C. papaya at the dose of 50 mg/ kg
and 100 mg/kg against alcohol induced acute gastric damage
and blood oxidative stress in rats. The gastric acidity was
significantly reduced in rats treated with 100 mg/kg of the
extract.
4. Anthelmintic
The dried papaya seeds gives as elixir with honey have shown
significant effect on the human intestinal parasites, without
significant side effects. Benzylisothiocynate, present in seeds
is the chief anthelmintic.
5. Effect on smooth muscles
Ethanol extract of papaya seeds at 0.1-6.4 mg/mL showed
concentration dependent inhibition of jejunam contraction and
found significantly irreversible. Thus the extract is capable of
weakening the contractile capability of isolated rabbit
jejunam.
6. Administration dependent antioxidant effect
Seeds are the less exploited part thus this study is aimed at
assessing the antioxidant activities of the C. papaya seeds
water extract against hydrogen peroxide (H2O2) oxidative
stress in human skin Detroit 550 fibroblasts. C. papaya seeds
water extract is not toxic and acts as a potent free radical
scavenger, providing protection to Detroit 550 fibroblasts that
underwent H2O2 oxidative stress. Study show that (1) the
maximum protective effect is achieved by the simultaneous
administration of the extract with 1 mmol/L H2O2; (2) the
extract in presence of an oxidative stress does not increase
catalase activity and prevents the release of cytochrome C and
the inner mitochondrial transmembrane potential loss; (3) the
extract is more efficient than vitamin C to hamper the
oxidative damage; (4) the purified subtractions of the seeds
water extract exert the same antioxidant effect of whole
extract. In conclusion, C. papaya seed water extract is
potentially useful for protection against oxidative stress.
7. Immuno- modulatory activity
Chemical constituents of the C. papaya seed extract and its
bioactive fraction were examined in vitro using lymphocyte
proliferation assays and complement-mediated haemolytic
assay.
8. Selected studies on pharmaceutical application of
Carica papaya on laboratory animals
The effects of Carica papaya on laboratory animals have been
reported as remarkable antifertility natural medicine
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Journal of Pharmacognosy and Phytochemistry
(Owoyele et al., 2008 & Lohiya et al., 2006) [37, 29]. Treating
rats with papaya extract in a dose of 200 mg/kg/day for
periods of 1 and 8 weeks revealed pronounced hypertrophy in
sperm characteristics and its ultra-structure. Rats treated with
a lower dose of 50 mg/kg showed mild hypertrophy and
hyperplasia effects in the mentioned characteristics. However,
gradual degeneration of the Sertoli cells, Leydig cells
germinal epithelium and germ cells were also been reported
(Manivannan et al., 2009) [31]. These findings were strongly
supported by other studies in which rats were given oral doses
of 50, 100, 250, and 500 mg/kg methanolic extract of C.
papaya seeds for 28– and 90–day periods (Lohiya et al.,
2006) [29]. It was found that in the rats treated with doses of
50, 100 mg/kg of the extract the density of the sperm
decreased whereas in the rats treated with the dose of 500
mg/kg levels for the same period, the interval total sperm
motility was inhibited. Similar findings were reported in
dose–dependent study in which suppression of aqueous C.
papaya seed extract on sperm motility in mice was
investigated and revealed that with high dosages of the
extract, decrease in both sperm count and viability were
observed (Verma et al., 2006) [58].
Aqueous extract of C. papaya seeds at doses of 100–400
mg/kg/day was investigated for its effects on hypolipidemic,
cardioprotective parameters in normal male Wistar rats for 30
days (Adeneye et al., 2009) [5]. Three groups of rats were
orally administered either with extract of Carica papaya seed
at doses of 100, 200, and 400 mg/kg/day of the extract or 0.1
mg/kg/day of glibenclamide or 10 ml/kg/day of distilled water
(control) for a period of 30 days. The results showed that
Carica papaya extract significantly (p<0.05) lowered the total
cholesterol, serum triglyceride, fasting blood glucose and
significantly (p<0.05) reduced the density of lipoprotein
cholesterol in a dose dependent manner compared to the
untreated control rats. A single oral dose at 2,000 mg/kg or
5,000 mg/kg of methanolic and aqueous extracts of whole
unripe extract of Carica papaya seeds were tested for their
toxic effects in rats and they did not elicit signs of toxicity in
the treated animals (Ezike et al., 2009) [17]. This study was in
a good agreement with the previous investigated study
(Lohiya et al., 2006) [29]. It was also found that rats orally
administrated with methanolic extract of Carica papaya seeds
daily for long term affected sperm parameters of the rats such
as motility, viability and count (Goyal et al., 2010) [19].
Recently, extract of Carica papaya leaves was investigated
for its toxicity (Halim et al., 2011) [21]. In the study, Sprague
Dawley rats received fixed doses of 5, 50, 300 and 2000
mg/kg of the extract and observed for 14 days. The given
doses even at the higher level (2000 mg/kg) did not produce
mortality or significant changes in body weight or food and
water consumption. The investigated rats did not show signs
of toxicity and no deaths were observed. In addition, normal
relative weights of the internal organs were observed.
However, significant increases in hemoglobin (HGB),
hematocrit (HCT), red blood cell (RBC) and total protein
were recorded indicating dehydration.
10. Studies on morphological and quantitative traits
The observations were recorded from December, 2008 to
May, 2013. The average monthly temperature was recorded
from IARI RS Pusa observatory. Morphological observations
were recorded for fruit surface, seed attachment, seed color,
seed surface, sarcotesta, removal of sarcotesta and vivipary in
both varieties namely, Pusa Dwarf and Pune Selection-3. The
fruits of Pusa Dwarf were observed with vivipary and
morphological observation for fruit surface, seed attachment,
seed color, seed surface, seed size, sarcotesta and removal of
sarcotesta during fruit harvesting (initia-tion of colour turning
stage) and seed extraction. The data were also recorded on the
total number of seeds/fruit, number of normal seeds/fruit,
number of deformed seeds/fruit, white seeds/fruit, vivipary
seeds/fruit, deformed seeds (%), seed harvest (%) and
economic losses (Rs/ha) in Pusa Dwarf at seed crop
harvesting (December to May) due to deformed seed disorder
in autumn crop. Each fruit was cut into two equal halves for
observing the incidence. The deformed/discolored seeds were
recorded by counting the seeds in different categories. An
economic loss was estimated by calculating the seed yield per
unit area in kilograms. Loss was estimated by observing seed
harvest (normal and deformed percent) in particular months
and multiplied by our sale price (at Rs. 40,000/kg).
Relationship between average monthly temperatures, time of
fruit harvest and seed disorders, namely, deformed seed and
vivipary seeds from December to May were shown during the
study years.
11. The cytotoxic effect of C. papaya extract has been
tested in various cancer cell lines in vitro studies
summarized in table
Cancer Cell
Line
Treatment
Result
Reference
Acute
promyelotic
leukemia HL-60
cells
n-hexane extract of papaya
seed or pulp (0.1– 100
_g/mL),Pure benzyl
isothiocyanate (10 _M)
Extract of seed: Dose dependently inhibited the superoxide
generation (IC50 = 10 _g/mL) and the viability of cells
(IC50 = 20 _g/mL), comparable to that of pure benzyl
isothiocyanate. Extract pulp had no effects at 100g/mL
Nakamura et
al., 2006 [35]
9. Phytochemicals in C. papaya with Reported Anticancer
Activities
Carica papaya contains a broad spectrum of phytochemicals
including enzymes (in the latex), Carotenoids (in fruits and
seeds), alkaloids (in leaves), phenolics (in fruits, leaves, and
shoots), glucosinolate (in seeds and fruits) (Krishna et al.,
2008; Parle et al., 2011) [27, 40]. Some important
phytochemicals found in C. papaya are Lycopene,
Betacarotinoid, Benzyl isothiocyanate, Betacryptoxanthin,
Benzylglucosinolate, chlorogenic acid, caffeic acid,
protocatechuic acid, Quercetin etc. Among more than 5000
compounds from plants that have been identified to be
associated with anticancer properties (Huang et al., 2009) [23],
three groups of bioactive compounds-phenolics, Carotenoids,
and glucosinolate-have attracted considerable interest in
anticancer studies. Pure compounds of these three groups
have been extensively researched in vivo and in vitro studies
on many types of cell lines for their potential effects in cancer
treatment and prevention. These bio actives act via multiple
mechanisms such as cancer cell signalling, proliferation,
apoptosis, migration, invasion, as well as angiogenesis and
carcinogen elimination (Huang et al., 2009; Zhang et al.,
2004; Thornalley et al., 2002; Nakamura et al., 2006; Wu et
al., 2009; Navarro et al., 2011; Wahle et al., 2011; Soobrattee
et al., 2006; Tanaka et al., 2012; Van Breemen et al., 2011)
[23, 62, 52, 35, 60, 36, 59, 49, 51, 57] to exhibit in vitro and in vivo
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Journal of Pharmacognosy and Phytochemistry
anticancer activities.
12. Papaya is Rich Source of Enzyme Papain which is
Effective against Cancer
Papain is an endolytic plant cysteine protease enzyme which
is isolated from papaya (Carica papaya L.). It preferentially
cleaves peptide bonds involving basic amino acids,
particularly arginine, lysine and residues following
phenylalanine. (Menard et al., 1990) [33] The unique structure
of papain gives its functionality that helps to understand how
this proteolytic enzyme works and it’s useful for a variety of
purposes. (Carica papaya L.).
Many cancer cells having a protective coating of fibrin. That
is why they go undetected for many months and years. Papain
breaks down that fibrin coat of cancer cell wall. So ultimately
it helps diagnose cancer cells.
13. Mechanism of Functions of Papain
The mechanism in which the function of papain is made
possible is through the cysteine-25 portion of the triad in the
active site that attacks the carbonyl carbon in the backbone of
the peptide chain freeing the amino terminal portion. As this
occurs throughout the peptide chains of the protein, the
protein breaks apart. The mechanism by which it breaks
peptide bonds involves deprotonation of Cys-25 by His-159.
Asparagine-175 helps to orient the imidazole ring of His-159
to allow this deprotonation to take place. Although far apart
within the chain, these three amino acids are in close
proximity due to the folding structure. It is though these three
amino acids working together in the active site that provides
this enzyme with its unique functions. Cys-25 then performs a
nucleophilic attack on the carbonyl carbon of a peptide
backbone. (Menard et al., 1990; Tsuge et al., 1999) [33, 55] In
the active site of papain, Cys -25 and His -159 are thought to
be catalytically active as a thiolate imidazolium ion pair.
Papain can be efficiently inhibited by peptidyl or non-peptidyl
N-nitrosoanilines. (Guo et al.,1995) [20]. The inactivation is
due to the formation of a stable S-NO bond in the active site
(Snitroso- Cys25) of papain. (Xian et al., 2000) [61]
14. Papaya is a Store-House of Cancer Fighting Lycopene
Lycopene is a member of the carotenoid family, which is
synthesized by many plants and microorganisms. It is a highly
unsaturated open straight chain hydrogen compound
consisting of 11conjugated and 2 unconjugated double bonds
(Stahl et al., 1992; Knachik et al., 2002; Rao et al., 2006) [50,
26, 43]. The red color of many fruits and vegetables is due to the
presence of lycopene. Because of the presence of double
bonds in the structure of lycopene, it can exist in both the cis
and Trans isomeric forms. Lycopene is present in foods
primarily in the all-trans isomeric form, (Cliton, 1998) [14]
However, it can undergo monoor poly-isomerization by light,
thermal energy, and chemical reactions to the cis isomeric
form. It is highly stable at high temperatures and can be
stored. (Agrawal et al., 2001) [6].
15. Isothiocyanate Found in Papaya Restore the Cell Cycle
to Eliminate Cancer
Organo-sulfur compounds called isothiocyanate are found in
papaya. In animal experiments, isothiocyanate protects
against cancers of the breast, lung, colon pancreas, and
prostate, as well as leukemia, and they have the potential to
prevent cancer in humans. Isothiocyanate have shown that
they are capable of inhibiting both the formation and
development of cancer cells through multiple pathways and
mechanisms (Barbara, October-2008) [8]. Researchers in Japan
clarified the mechanisms of action in a type of isothiocyanate
found in papaya known as BITC. That underlies the
relationship between cell cycle regulation and appropriate cell
death. When cancerous cells die on schedule, they are no
longer a problem. The researchers established that BITC
exerted cancer cell killing effects that were greater in the
proliferating cells than in the quiescent cells. Cancer cells that
are proliferating are much more dangerous than cancer cells
that are in a state of dormancy (Barbara, 2009) [9].
16. Conclusion
Carica papaya is an important and promising natural
medicinal plant which could be utilized in several
pharmaceutical and medical applications because of its
effectiveness, availability and safety. The papaya plant has
been touted by traditional hearlers for counties as source of
powerful medicine. Slice open a papaya and see hundreds of
shiny black seeds that all need to get there start in life from
the nutrition found in the fruit. Papaya promotes immune
system. Papaya is potent cancer fighter that is highly effective
against hormone related to cancer as well as other cancer.
Papaya can stop the growth of cancer cell, halt metastasis and
normalize cell cycle. Fruit and seed disorders in papaya cause
great economic losses in seed production during autumn sown
crop. We observed that Pune Selection-3 and Pusa Dwarf
were the most susceptible germplasm lines for bumpy fruit
and deformed seed disorders, while vivipary and white seeds
(disturbed sarcotesta) are a serious economic problem only in
Pusa Dwarf. The challenges that Indian Agriculture faces in
the coming years remain enormous. The seed production in
papaya with 100% genetic purity is difficult because of
dioecious nature of the plant. Therefore, the seed should be
produced either strictly under controlled condition or in an
isolated area.
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