Parquetina nigrescens Checks the Ulceration and Oxidation
Received: August 23, 2011;
Accepted: October 24, 2011;
Published: December 08, 2011
Ulcer, when found in the gastrointestinal tract is called as peptic ulcer,
which is a hole in organ wall. It has a relationship with ABO/Rh blood types,
as it is mostly found in persons of A (37.1%) and O (35.6%) blood groups. While
it is least present in the AB blood group person and the people with Rh-VE blood
type are also at less risk (Rasmi et al., 2009).
Its prevalence increases after the age of 30 years and highly prevalent within
the age of 30-39 years (Bener et al., 2006).
It can be due to smoking, diabetes, medicines and over eating. A bacterium;
Helicobacter pylori can also cause ulcer by secreting urease protein
and inducing oxidative stress (Kebapcilar et al.,
2009; Mortazavi et al., 2011). Although,
oxidants are produced in the body through metabolic pathway, they can damage
the cells by reacting with lipids, proteins or genetic material and also cause
inflammation (Wu and Cederbaum, 2009). But oxidation
relating diseases like ulcer can be treated well with the use of plants; they
reduce the extensive damage caused by oxidation via reducing the reactive oxygen
species (Akah et al., 2007; Rifat-uz-Zaman
et al., 2006). Parquetina nigrescens is such a medicinal plant
which inhibits inflammation, improved blood parameters and has analgesic property
(Agbor and Odetola, 2005; Owoyele
et al., 2009). Its extracts reduce the lipid oxidation in rats
liver by inhibiting oxidative species (Ayoola et al.,
2011). Thus plants can be helpful in reducing the ulcer caused oxidative
Parquetina nigrescens is a woody wine, with large leaves and fleshy
petals; it turns black upon drying (Venter, 2009). Due
to its many remedial properties Kayode et al. (2009)
examined curative tendency of its extracts in protecting the mice liver and
stomach from ulcer. They incorporated the different concentration of plants
hexane and chloroform extracts as a pretreatment before the ethanol-induced
ulcer and oxidative stress. Ethanol induction caused gastric lesions with reduced
activity of anti-oxidant enzymes; superoxide dismutase (SOD) and catalase (CAT).
Moreover, it also caused a detrimental reduction in reduced glutathione (GSH)
levels in both liver and stomach. The stressed animals pretreated with plants
extracts showed nearly normal level and activities of these anti-oxidant agents,
which were comparable to that of standard anti-ulcer drug; cimetidine. But both
these extracts showed different anti-ulcer behaviors depending upon their concentrations.
As hexane extracts, when applied in concentration of 500 mg kg-1
body weight (b.wt.), reduced the ulcer index more vigorously (62%) than its
1000 mg kg-1 b.wt. induction (52%). Whereas, chloroform extracts
reduced the ulcer index relatively at higher concentrations; 31% at 500 mg kg-1
b.wt. and 70.9% at 1000 mg kg-1 b.wt. But this activity pattern of
hexane extracts varied when observed in liver and gastric-mucosal enzymes activation.
At higher concentrations it provided slightly more but non-significantly different,
health benefiting effects, from its lower concentrations. It significantly increased
the activity of SOD and CAT enzymes at both concentrations, but more strongly
at 1000 mg kg-1 b.wt. Likewise the chloroform pattern was also changed
in the liver and stomach enzymes activity induction. As chloroforms both
concentrations increased the enzyme activity, which were non-significantly different
from each other. Such pattern was again followed by the chloroform and hexane
extracts in increasing the levels of both gastric and liver GSH. Thus, all these
parameters (ulcer index, SOD, CAT activities and GSH levels) in plant treated
animals were significantly different from diseased animals. This signified that
plant P. nigrescens protected the animals liver and stomach by
reducing ulcer-caused oxidative stress. But these parameters were non-significant
when compared in cimetidine supplemented and extracts-pretreated animals, which
means extracts curative potential was as high as that of standard drug.
During experiment it was also noted that hexane extracts caused least cytotoxicity
and can be safely used at concentration of 7.5 g kg-1 b.wt. Whereas,
its maximum required concentration was not more than 1 g (1000 mg) kg-1
b.wt. Thus P. nigrescens showed potent curative property and provided
a safer extract (hexane extract) for ulcer prevention. Its use was more reliable
than the compared drug, because drugs usually cause toxic effects. Shabahang
(2010) during his study on drug-caused side effects reported the cimetidine
caused erythema multiforme. It is a type of allergic reaction, usually contributed
by medication or infection. Hence, P. nigrescens should be used instead
of cimetidine to treat the oxidative stress of liver and stomach.
Oxidative species are the products of metabolic reaction but their over production
due to some disease or inadequate food intake can be the source of diseases
e.g., ulcer. Ulcer is the oxidative damage of cells or tissues and can be treated
through antioxidant species. Plants are important source of antioxidants and
Kayode et al. (2009) conducted a hepato-gastric
protective study on a medicinal plant P. nigrescens. According to their
findings this plant provides liver and stomach an antioxidant protection. It
enhances the activities of oxidant eaters (SOD, CAT and GSH) and reduces the
gastric lesions; its hexane extracts have cytotoxicity less than a standard
cimetidine drug. Thus the use of P. nigrescens is beneficial from the
point of view of ulcer prevention and its use will also lessen the inflammation
and other health problems.
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