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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5569_Библиотеки_им_академика_М_И_Перельмана
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infections obtained in chloroquine-resistant regions. Infections obtained in Southeast
Asia are treated for 7days, while infections attained in Africa or South America are
treated for 3days. The goal of the combination is to improve quinine effectiveness,
reduce treatment time, and reduce toxicity [56]. Clindamycin, instead, has an excellent pregnancy safety prole [57], and its PK parameters are typically unaffected
throughout pregnancy [58].
The remedy of leg cramps produced by vascular spasm is another prominent
usage of quinine. Quinine, hydroquinine, as well as quinidine have been used to
avoid muscular cramps for over 50years [59].
COVID-19, which is caused by the SARS-CoV-2 virus, has lately overloaded
medical facilities and crippled economies. The unprecedented public outcry produced by this epidemic necessitated a hasty search for an efcient way to control or
treat the disease. Quinine and their derivatives have been investigated as possible
COVID-19 treatments due to their well-known anti-infectious and anti- inammatory
characteristics. Indeed, these molecules were rst used to cure and prevent malaria,
and then subsequently in the therapy of autoimmune, rheumatic, and dermatologic
illnesses [60]. These antimalarial medications, on the other hand, are utilized for a
number of chronic illnesses, including systemic lupus erythematosus, with minor
adverse effects and are known to have anti-inammatory and antiviral qualities.
Because of its method of action, the antiviral activity of hydroxychloroquine and
chloroquine has piqued the curiosity of several investigators [61]. Several invitro
and invivo studies initially indicated encouraging ndings for the use of hydroxychloroquine (HCQ) in the treatment of COVID-19 patients [62]. The daily doses of
HCQ used to treat COVID-19 have ranged between 800 and 1600mg. They did,
however, establish the effective and safe dosage of HCQ based on evidence from
in vitro investigations and clinical trials in one study. They looked at the link
between viral load reduction and HCQ dosing in COVID-19 patients who had been
treated. The results of this study indicate that an amount of HCQ taken every day
should not be greater than 800mg [62].
According to a recent research, it has been reported that Quinine Sulphate (QS)
is a possible therapy option for SARS-CoV-2 infection that is well tolerated and has
a predicted toxicological prole that is much better than hydroxychloroquine and
chloroquine [63]. QS does, however, have a number of adverse effects that impact
haematological, renal function, liver function, and cardiovascular health [64].
Quinine was used as a lead structure in the synthesis of various antimalarial
medications such as chloroquine (27), meoquine (28), pyrimethamine (29), proguanil (30), atovaquone (31). Quinine, is still used today to treat acute cases of
severe P. falciparum, alone or in combination with doxocycline, tetracycline, or
clindamycin [73].It is used for various purposes other than antimalarial such as:
• a avour component in beverages and food industries [74].
• muscle relaxant
• hemorrhoid therapy
• an oxytoxic agent
F
30
31
32
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N
27
235
F
F
H
N
Cl
HO
N
O
28
F
F
N
HN
F
NH
2
N
NH
N
2
Cl
29
O
NH
NH
2
2
N
N
N
H
Cl
OH
Cl
O
N
Fig. 10.5 Several Anti-malarial drugs
Cinchonism is the commonest side effect of quinine overdose. The primary site of
damage by quinine overdose is the Nervous system including optic and auditory
nerve [2] (Fig.10.5).
10.17 Medicinal Uses ofQuinidine andIts Derivatives
It is another important alkaloid found in the bark of cinchona plant. It works as
antimalarial and antihypertensive [76].Quinidine was the rst drug to be utilized for
curing the cardiac arrhythmias. Quinidine, a diastereomer of the antimalarial quinine, was discovered to be the utmost effective of the antiarrhythmic compounds
derived from this plant in early twentieth-century studies. Quinidine has been used
as an antiarrhythmic drug since the 1920s to sustain sinus rhythm following alteration from atrial utter or atrial brillation and to avoid ventricular tachycardia or
ventricular brillation recurrence [65]. But the prevalence of gastrointestinal issues
following its administration has been one of the main limiting factors in its utilization [66, 67]. A novel quinidine derivative was recently created to eliminate this
adverse effect [68]. The novel derivative, quinidine polygalacturonic acidate, is created by the reaction of quinidine base and polygalacturonic acid. It has been demonstrated that the pharmacology of quinidine polygalac turonate is comparable to
that of common quinidine compounds in both animals and humans. It acts on the
heart to prevent brillation of the auricles by extending the heart muscle’s refractory
period, slowing conduction time, and reducing the heart muscle’s excitability [69].
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Possess antimalarial,
Antipyretic and oxytocic
p
Reduces membrane
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Prevent the reentry
Of arrhythmia
roperties
Directly affects
Cardiac cells
Fig. 10.6 Effects of quinidine
H
HO
H
CO
3
H
N
Quinidine
Inhibits ectopic arrhythmia
And Ventricular arrhythmia
H
N
responsiveness
Prolong effective
refractory period
Quinidine has a variety of effects on the heart, many of which are paradoxical
and incompletely understood. The following is a list of quinidine’s effects: Quinidine
works by blocking the vagus nerve’s function on the heart, similar to atropine but
with a less dramatic effect. When the vagus nerve is activated, its anticholinergy
activity counteracts the effects of carotid sinus pressure and prevents heart rate lowering. Myocardial excitability is also reduced by using quinidine. 5′,6 The maximal
rate at which the atrium reacts to repeated electrical stimulation is reduced after the
heart has been exposed to quinidine. This mechanism is responsible for the drug’s
capacity to prevent or eliminate cardiac arrhythmias while simultaneously lowering
myocardial contractility [70] (Fig.10.6).
It is observed that relatively low doses of quinidine with dextromethorphan (32)
is effective to treat the pseudobulbar affect disorder, and quinidine alone is rarely
used to treat seizures [77].
10.18 Medicinal Uses ofCinchonine
It is also used as an antimalarial drug [3]. In comparison to Quinine, it is more active
and less poisonous than other quinine-related substances [2]. It serves as an antibiotic agent and is used to treat schizonticide, amoebiasis, fever, dysentery, and fever.
It causes mild aggravation of the gastric mucosa [74].Cinchonine has also a role in
inhibition of osteoclast differentiation by regulating TAK1 and AKT through targeting TRAF6. It acts as a preventative measure against osteoporosis and bone problems brought on by inammation [75].
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10.19 Medicinal Uses ofCinchonidine
Cinchonidine is most frequently used as an anti-malarial drug. It can be present in
the bark of most cinchona species, including C. pusescensval and C. pitayensis [3].
10.20 Other Applications ofCinchona Alkaloids
10.20.1 Anti-microbial Activity
The disc diffusion method is used to assess the antibacterial impact of cinchona
alkaloids on Staphylococcus aureus, which ranges from 8 to 18mm. Its antibacterial effectiveness increases as cinchona alkaloids concentrations increase. Herpes
and disorders brought on by Plasmodium falciparum are treated with Cinchona bark
[78]. Cinchona combats microorganisms that are harmful to the human body [79].
10.20.2 Anti-inammatory Activity
For hundreds of years, cinchona bark has been used to treat inammation and prevent malaria [80].
10.20.3 Anti-oxidant Activity
Cinchona has strong antioxidant qualities since it contains phenolic components
(Phenols and aveniods). The biological features of phenols include inhibition of
lipid peroxidation, anti-HIV, anti-virus, and anticancer effects [3]. The extract of
C. ledgeriana leaf has excellent antioxidant activity in the ethyl acetate fraction and
water insoluble fraction, with IC50 values of 23.57g/mL and 17.63g/mL, respectively [26]. Cinchona alkaloids have the potential to be employed in anti-aging cosmetic preparations due to their strong antioxidant activity (IC50<50g/mL) [24]. A
possible anti-oxidant raw material for the cosmetics sector is the dry extracts from
the species Cinchona pubescens Vahl [33].
10.20.4 Anti-obesity Properties
Cinchoquine which is considered a strong alkaloid is obtained from cinchona bark.
Although it is mostly employed in anti-malaria activities, it can also treat the problem of obesity. In 2012,experiments have shown that cinchoquina is superior to
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other chemicals(derived from other plants)in the ght against obesity [3]. The body
weight loss caused by chincinnovine was larger than that of EGCG and curcumin.
A benecial dietary phytochemical for preventing obesity and fatty tissue inammation is pentachloroquine [81].
S. Aslam etal.
10.20.5 Anti-Cancer Activity
Cinchona alkaloids derived from C. legeriana and C. succirubra have been shown to
be effective against a number of cancer cells, including lung cancer A-549, human
myeloid leukaemia HL-60, breast cancer MCF-7, colon cancer SW480 and hepatocellular carcinoma SMMC-7721 [23]. Quinine affects the death of cancer cells and
reduces their ability to proliferate in a dose- and time-dependent manner [2].
Apoptotic signals, the loss of apoptotic bodies and adhesion, cell contraction, membrane blistering, chromatid condensation, and nuclear fragmentation are only a few
of the typical morphological alterations brought on by quinine’s impact. In the
future, quinine may be a successful anticancer medicine because it has a signicant
apoptotic action in cancer [82].
10.20.6 Anti-platelet Activity
It has been observed that Cinchona alkaloids works as an antiplatelet by preventing
human platelet aggregation. Protein kinase C (PKC) and Ca2+ entrance are both
inhibited, which prevents platelet aggregation [75].
10.20.7 Anti-viral Activity
Broad-spectrum antiviral properties are present in chloroquine phosphate, an analogue of quinine that was initially obtained from the bark of the Cinchona tree [83].
It has been experimented that Quinine has antiviral activity against SARS-CoV-2in
Vero cells. As evidenced by the endogenous expression of ACE2 and TMPRSS2in
Calu-3 lung cells, Quinine at concentrations over 50M suppressed SARS-CoV-2
infection (IC50: 3.7 to 50M). Quinine thus, has the potential to be a less harmful
antiviral medication for SARS-CoV-2. This demonstrates Quinine’s potential to
become a useful antivirus in the future [84].
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10.20.8 Anti-diabetic Activity
The leaf extract of C. ledgeriana was screened for alpha-glucosidase inhibition
activity by using Kim method at 400nm (UV-Visible spectrophotometer) [85]. All
C. ledgeriana fractions and extracts demonstrated signicant enzyme inhibition
activity with IC50 values ranging from 14.44 to 61.56g/mL and LC50 values ranging
from 14.79 to 120.22g/mL Consequently, C. ledgeriana leaf extract may have antidiabetic effects, although more isolation is required to lessen its toxicity [24].
Additionally, aqueous extracts of C. calisaya bark showed greater antidiabetic
action at a lower dose of 50mg/kg body wt when used to treat alloxan-induced
diabetes mellitus [34].
10.20.9 Anti-fungal Activity
Various cinchona alkaloids and their derivatives were evaluated for activity against
eight plant pathogenic fungi, including R. solani, P. zeae, B. cinerea, M. melonis,
F. graminearum, M. oryzae, S. sclerotiorum, f.sp. vesinfectum and F. oxysporum by
applying mycelium growth rate method. Major Quinolines (1, 2, 3, and 4) had weak
antifungal activity. Derivatives, such as simplied quinone and quinotoxine molecules, on the other hand, frequently tend to boost the antifungal action [24, 86].
10.20.10 Hair Growth Stimulant
Major quinoline chemicals found in cinchona extract (1–4) may prevent hair follicle
death and prevent hair loss [87]. Cinchona alkaloids have demonstrated their activity as hair growth stimulants. To exhibit the activity, their penetration into hair follicles and dermal papillae is very important to enhance the production of Vascular
Endothelial Growth Factor. It is crucial for the growth of hairs and their regeneration. Cinchonine resulted in 17–43% increased hair length as compared to the controls [24].
10.20.11 Muscle Cramp
Cinchona alkaloids have neuromuscular and muscle effects [24] and has been used
in the treatment of muscle cramps. Quinine (1) and quinine sulphate [4] have been
found to reduce the occurrence and severity of muscle cramp including leg cramp
[88] but use of quinine to alleviate muscle cramps is still a matter of debate
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regarding its effectiveness and safety [89] especially in older people, dose related
side effects. Cinchona bark works as a muscle anti-cramp in low doses. It blocks the
response of acetylcholine in Xenopus laevis oocytes. The response-blocking activity of acetylcholine is inuenced by the concentration of cinchona alkaloids, such as
Qunine (IC50: 1.70μM) and Quinidine (IC50: 3.96μM) [90]. Acetylcholine concentration has no effect on the response of blocking mechanism [24].
10.20.12 Anesthetic andAntipyretic Activity
Herbal medicines can be divided into local and general anesthetics depending on
how they work. General anesthetics impair sensory and motor function by interacting with protein receptors and membranes, whereas local anesthetic herbs perform
their function by interacting with voltage-gated Na+ channels [24]. In comparison
to the anaesthetic effect of 2% xylocaine, the 10–20% concentration of aqueous
extract of C. ofcinalis had an anesthetic effect (p<0.001) of 72.12 and 88.08%.
The C. ofcinalis extract displayed the antipyretic efcacy comparable to aspirin at
single doses [91].
10.20.13 Insecticidal Agent
Acyloxy derivatives of cinchonidine and cinchonine have found to be effective
insecticidal agents. This activity has been evaluated invivo against Mythimna separate by leaf dipping method at a concentration of 1mg/mL.The derivatives 33 and
34 demonstrated the highest insecticidal activity with nal fatality rates of 75.0%
and 71.4% respectively [92].
N
O
O
NO
33
2
N
N
O
O
34
(DHQD)2PHAL
(DHQ)2-PHAL
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10.20.14 Applications inOrganic Chemistry
Cinchona alkaloids have been employed as chiral catalysts, ligands, and NMR discriminating substances in organic chemistry for the past 30years [93–96].Cinchona
alkaloids have been reported as enantioselective organocatalyst under mild reaction
conditions for the allylic amination of Morita–Baylis–Hillman carbonates using
isatins as pronucleophiles. Quinine, Quinidine, O-benzylquinidine, (DHQD)2PHAL,
(DHQ)2- PHAL, were used as a catalyst in this reaction and results have shown that
(DHQD)2PHAL performed best catalytic activity afforded the required products in
81% yield with 57% enantiomeric excess [94].
N
O
BnO
H
N
O
O
N
O
N
H
N
N
H
N
N
O
O
O
H
N
O
N
H
N
N
N
N
O
O-benzylquinidine
They act as chiral resolving agents as well as catalysts or cocatalysts in both
homogeneous and heterogeneous systems [97] and also works as a chiral selector in
stationary phases or as a catalyst in asymmetric organic synthesis. Due to their low
cost, ease of quaternization, and adaptability, cinchona alkaloids have been substantially for the synthesis of phase transfer catalysts [98, 99]. In 2016, Lajkó et al.,
stereoselectively separated the cyclic β-aminohydroxamic acid enantiomer pairs on
the quinine or quinidine and chiral sulfonic acid-based zwitterionic chiral stationary
phases ZWIX(+)™, ZWIX(−)™, ZWIX(+A) and ZWIX(−A) by high performance
liquid chromatography [99] (Fig.10.7).
10.21 Biosynthesis ofCinchona Alkaloids
The complete biosynthesis of alkaloids was suggested in the 1960s [100] and has
only been slightly altered (Schemes 10.1) [101, 102]. Cinchona alkaloids belong to
the terpene-indole alkaloid family, which also contains well-known natural compounds like strychnine, yohimbine, reser pine, and ajmaline. Strictosidine,which
can be traced back to geraniol is formed from tryptamine and secologanine and it is
a common biosynthetic intermediary for all of them.. It is converted to cinchonaminal through the Cinchona alkaloids-specic pathway as this step is mediated by
strictosidine glycosidase, which involves in the formation of six membered ring
containing nitrogen atom, followed by hydrolysis and decarboxylation of an intermediate molecule to produce corynantheal. In chinchonaminal, the azabicyclo[2.2.2]octane system is eventually produced via ring rearrangement through
242
N-benzylcinchonidiniu
m
chloride
OH
Quinidine, R=
3
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N
+
-
N
OH
Cl
N-anthracenylmethylcinchonidiniu
mchloride
Fig. 10.7 Cinchona alkaloids asphase transfer catalysts
OH
(a)
OH
Geraniol
NH
N
H
MeO2C
Strictosidine
10-hydroxy geraniol
OGlc
O
(c)
N
H
Tryptamine
S. Aslam etal.
-
Cl
+
N
NH
OH
+
N
OHC
Iridodial
(b)
O
O
CO2Me
Secologanin
Glc
N
N
H
Corynantheal
R
OH
N
Cinchonine,R= H
CHO
N
OCH
Scheme 10.1 Biosynthesis of chemical components present in Cinchona. Enzymes included in
the pathway: (a) geraniol 10-hydroxylase; (b) secologanin synthase; (c) strictosidine synthase; (d)
strictosidine glucosidase; (e) cinchoninone: NADPH oxidoreductase
H
(d)
3
N
OHC
Cinconaminal
R
N
N
O
N
(e)(e)
Cinchodine,R= H
Quinine, R=OCH
N
HN
HO
Cinchonamine
R
N
N
OH
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iminium intermediates named as cinchonamial. Cinchonamine, a minor alkaloid,
may be formed by reducing the pendant aldehyde group in cinchonamial. The primary route, on the other hand, leads to cinchonaminal by the hydrolytic breakage of
the indole C–N link, which results in the dicarbonyl intermediate.
10.22 Future Prospective ofCinchona ofcinalis
Natural goods are becoming increasingly popular, and it is expected that cinchona
bark will continue to be a staple of herbal treatment for a long time. Natural goods
are becoming more popular in western nations. Cinchona bark is used to treat sore
throats as a gargle. It’s used to treat nervous ergotamines, anaemia, and convalescence in homoeopathy. Cinchona bark is a leading antiprotozoal treatment in
European herbal medicine, used to treat a variety of fevers. It aids in the treatment
of gall bladder, enlarged spleen, and liver problems. It’s utilised as a stimulant in the
products use for the growth of hair. The bark has made a resurgence in the form of
“bark tea,” that is utilized to treat malaria.
Throughout the previous four eras, the natural alkaloid quinine found in Cinchona
has played a signicant part in both the anticipation as well as handling of malarial
desease. Malaria was treated before the discovery of quinine by releasing humours,
which included blood loss, removal, and by employing laxatives. English physicians considered Robert Talbor, the rst person to employ quinine in England, as a
quack. He gained prominence only after successfully curing Charles II of France
from a deadly malarial illness [103]. Even the synthetic versions of quinine that
have taken its place are based on a new model of the molecule, demonstrating its
uniqueness.
References
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position in Cinchonoideae, and description of a new genus. Ciliosemina Taxon, 54(1), 17–28.
2. Raza, M. A., Rehman, F.U., Anwar, S., Zahra, A., Rehman, A., Rashid, E., etal. (2021).
The medicinal and aromatic activities of cinchona: A review. Asian Journal of Advances in
Research, 29, 42–45.
3. Gurung, P., & De, P. (2017). Spectrum of biological properties of cinchona alkaloids: A brief
review. Journal of Pharmacognosy and Phytochemistry, 6(4), 162–166.
4. Kishor, C.B., Tanu, G., & Radhey, M.S. (2018). Alkaloid group of Cinchona ofcinalis:
Structural, synthetic, and medicinal aspects. Synthesis of Medicinal Agents from Plants,
2018, 205–227.
5. Loustalot, A.J., Winters, H.F., & Childers, N. F. (1947). Inuence of high, medium, and
low soil moisture on growth and alkaloid content of Cinchona ledgeriana. Plant Physiology,
22(4), 613.
6. Datta, M., Sah, K., Gupta, S., & Banerjee, S. (1990). Characteristics of soils supporting cinchona plants in Darjeeling hills. Indian Agriculturist, 34(2), 73–77.
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