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immediately activated by forskolin in intact cells and tissues, as well as in a solubilized adenylate cyclase preparation. This impact of C. forskohlii root infusions on
blood pressure has been documented. All human adenylate cyclase types, with the
exception of type IX found in spermatozoa, may be activated by forskolin [37].
Nearly all adenylatecase-sensitive hormones are directly activated by forskolin in
intact cells, tissues, and even a soluble form of adenylatecyclase. The novelty of this
activation is that the catalytic subunit of the enzyme or a protein that is closely
related to it is the active site for forskolin, which in turn raises the level of cAMP
and prevents basophil and mast cell degeneration [37, 38].
S. Aslam etal.
9.15 Medicinal Uses ofColeus
Since the start of civilization, medicinal herbs have been used to identify numerous
human ailments . Natural compounds extracted from medicinal plants, whether as
pure substances or standardized extracts, present a limitless prospect for current
medication discovery because to the unrivalled availability of biodynamic ingredients. [39].
The tuberous coleus forskohlii is the most important medicinal coleus species in
India. Other species include C. amboinicus, C. scutellaroides, C. blumei, and
C. malabaricus, which are applied for the diagnoses diarrhoea as well as digestive
diseases [40]. P. forskohlii is commonly used for a variety of disorders in many
nations. The leaf of this plant is effective as an emmenagogue, diuretic, and expectorant in Egypt and Africa. It is used as a herbal medicine for stomach problems and
to treat intestinal diseases in Brazil [25].
Because of diverse bioactivity and therapeutic characteristics of C. aromaticus,
is frequently used as an herbal medicine. The leaves as well as its juice are used for
the treatment of common cold, breathing issues, bladder stones, bilious infections,
kidney indigestion, bronchitis, cholera, colic, ts, cough, diarrhoea, dyspepsia, dysentery, epilepsy, renal and vesicle calculi, headache, fever, poisonous bites, and vitiated conditions of Kapha and Vata [41]. C. aromaticus is known as Paashanbhedi in
traditional medicinal dictionary because it is used to evacuate kidneys [42].
Infections, rheumatism, and atulence as well as, coughs, sore throats, and nasal
congestion, hepatopathy, malarial infection, hiccoughs, bronchitis, helminthiasis,
and epilepsy, have also been historically treated using Coleus amboinicus leaves
[43–45].
9.16 Medicinal Uses ofForskolin
Recent scientic researchers have revealed that coleus includes a powerful chemical
called forskolin, which has muscle relaxant qualities and the potential to widen
blood vessels, lowering blood pressure (anti-hypertensive property). When blood
2
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205
Fig. 9.5 Structure of
forskolin
CH
O
OH
H
OH
3
CH
O
OCOCH
CH
3
vessels are dilated, the heart needs to work less to pump blood around the body.
Coleus has been shown to be benecial to people with cardiomyopathy (Fig.9.5).
C. forskohlii’s morphology, phytochemical analysis, and pharmacology have all
been studied. Forskolin, a labdane diterpene derived from Coleus forskohlii [46,
47], has been shown to stimulate adenyl cyclases and raise cyclic adenosine mono-
phosphate (cAMP) [48].
Besides increasing stimulating activity of cAMP, forskolin prevents plateletactivating factor (PAF) binding independently of cAMP production [36]. Forskolin
to decrease glucose transfer in erythrocytes, adipocytes, platelets, and other cells
through affecting multiple membrane transport proteins [49]. Forskolin also has
cyclic AMP independent actions via nicotinic acetyl choline receptor channel modulation, desensitization, voltage dependent potassium channel modulation, and drug
resistance reversal [50]. Forskolin and Coleus forskohlii’s safety have not been sufciently studied. People with ulcers should stay away from it because it might raise
their stomach acid [51].
Forskolin has been shown to be benecial in a variety of disorders, including
hypertension [52], glaucoma [53], asthma [54], cancer [55], diabetes [56, 57] and
increased the rate of sensory nerve regeneration in sciatic nerves that had been frozen [58]. Additionally, its leaves are used as a avoring agent and to treat digestive
problems. Furthermore, the antioxidant properties of distinct sections of the plant
has not been recorded previously, prompting the investigation of the antioxidant
capacity of C. forskohlii’s various portions [59].
9.17 Role ofColeus froskolin inHypertension
The most prevalent psychosomatic condition, hypertension, affects 972 million
individuals globally. Researchers discovered the diterpene, Forskolin, which has
blood pressure lowering and antispasmodic properties, from the roots in 1974, making it the only plant source known to have this chemical thus far.The therapeutic
properties of this alkaloid known as “forskolin“are well known due to its exceptional capacity to activate the enzyme Adenylate cyclase in the absence of a functional guanine nucleotide regulatory protein. It is known to possess hypotensive,
positive inotrophic, anti-inammatory, antispasmodic, smooth muscle relaxant,
with anti-platelet aggregation, vasodilator, anti-metastatic properties (Fig.9.6) [60].
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S. Aslam etal.
Used forthe treatment
of asthma.
Boosting Sexual Libido
Boosting Metabolism
TreatmentofPsoriasis
Treatheart disease,
convulsions.
Fig. 9.6 Medicinal uses of Coleus forskohlii
Used to treatcongestiveheart failure
andpoorcoronaryblood flow
Lowerblood pressure
(anti-hypertensive property)
Coleus
forskohlii
Promoteweight-loss
Relief from Irritable
BowelSyndrome(IBS)
CuresGlaucoma
9.18 Role ofColeus froskolin inPsoriasis
A common skin ailment known as Psoriasis, in which the skin thickens and becomes
covered with silvery scales. Psoriasis is a widespread condition that affects millions
of individuals worldwide. Coleus, an Ayurvedic herb, extracted from Coleus
Forskolin has long been used as one of numerous natural psoriasis treatments.
Coleus has been demonstrated to be helpful in the treatment of skin disorders like
psoriasis because of its ability to promote regular cell formation. Herbalists utilize
it to cure not just psoriasis, but also eczema and cancer [61]. Psoriasis causes cells
to divide 1000 times quicker than normal. Coleus alleviates psoriasis by restoring
the cAMP/cGMP ratio to baseline. Patients with psoriasis have been found to benet from forskolin’s ability to alter cAMP levels in skin cells [62].
9.19 Role ofColeus froskolin inAnti-obesity
To check the anti-obesity potential, Coleus forskohlii were examined in the overreacted betrayer and Coleus forskohlii extract to reduced body weight, food absorption, and growth in those rats, suggesting that Coleus Forskohlii may be benecial
in determining appropriateness [63]. Coleus Forskohlii does not appear to increase
weight reduction, although it may assist obese females lose weight without any
clinically relevant side effects [64, 65]. Forskolin activates adenylate cyclase, which
is responsible for the synthesis of cAMP (a crucial biochemical compound in metabolic processes). cAMP causes biochemical reactions that accelerate fat loss,
enhance lean body mass, activate metabolic processes and diet-induced thermogenesis [66].
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9.20 Role ofColeus froskolin inCancer Metastasis
Forskolin is being researched as a possible therapy for concrete.Both invitro and
invivo platelet aggregation is a common side effect of many metastasizing cancer
cell lines. When platelets clump together, they release substances that encourage the
growth of tumours. Researchers discovered that forskolin can prevent platelet
aggregation by enhancing intracellular Camp and activating adenylate cyclase..
Forskolin inhibited lung tumour growth by 70% [67].
The roots of C. forskohlii are high in diterpenes [68] such as coleonol, forskolin,
and barbatusin [69–72]. These diterpenes have been demonstrated to be successful
in treating a number of ailments, including coronary heart disease, hypertension
[73, 74], asthma, glaucoma [75], and Alzheimer’s disease [76, 77]. Its other applica-
tions in boosting lean body mass, treating mental disorders [78], and as anticancer
agents [55, 79].
9.21 Role ofColeus froskolin inTreating Glaucoma
Glaucoma is a disorder where the pressure inside the eye is abnormally high
(>22mm/Hg) due to an imbalance between the creation and drainage of aqueous
humour from the eye. If left untreated, an increase in IOP causes irreparable nerve
damage and reduced vision, eventually leading to blindness. There are no professionally validated alternative remedies for glaucoma, however there are a number of
useful treatments, one of which is coleus. Forskolin lowers IOP by decreasing aqueous humour input while maintaining outow capacity, indicating forskolin’s potential as a glaucoma therapy medication [80]. Topical administration of forskolin
decreased intraocular pressure in rabbits, monkeys, and healthy human volunteers.
Additionally, it was connected to a reduction in aqueous inow and no alteration to
the outow facility [81].
9.22 Role ofColeus froskolin inTreating Asthma
Because of the intricacy of its origin, bronchial asthma is challenging to treat [82].
Early asthma is characterised by an inux of inammatory cells as a result of an
imbalance in the ratio of Th1 and Th2 cells [83, 84]. The next stage involves reshap-
ing of the airways as the inammation worsens. Extracellular matrix (ECM) degradation can result in airway inammation, whereas ECM buildup results in airway
remodeling [85]. Tissue inhibitors of MMPs (TIMPs) are MMP inhibitors, whereas
matrix metallopeptidases (MMPs) may break down the ECM [86].
Forskolin was investigated as a potential bronchodilator for the asthma treatment
[87]. Blocked bronchospasm, the main feature of bronchitis and asthma is produced
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in guinea pigs by histamine and leukotriene C-4 [35]. Forskolin powder formulations for inhalation were shown to be capable of producing brochodilation in asthma
sufferers, according to a human investigation [88]. If administered in the right dosage, forskolin appears to be a potential medication for treating people with asthma,
as well as congestive heart failure [89].
S. Aslam etal.
9.23 Antithrombotic Effect ofColeus
By activating adenylate cyclase, forskolin reduces platelet aggregation while
enhancing prostaglandin effects [90, 91]. It was noted in rabbits that its antithrombotic activities may be strengthened by cerebral vasodilation. Adenosine did not
enhance this vasodilation [92]. Unprocessed C. forskohlii extract has been proposed
as a powerful phytotherapeutic antithrombotic agent [93].
9.24 Other Uses ofColeus froskolin
Forskolin can also help to reduce hair greying, hair loss and it also helps in bringing
grey hair back to its natural hue [94]. Though the coleus plant is well-known for its
medical benets, its owers, tubers, and stems also contains essential oil, which has
an appealing odour with a spicy avour [95]. The coleus plant’s essential oil is utilized in the food avouring business. It’s also used as an antibacterial agent [96].
Forskolin must be used primarily for cosmetic purposes to help those with fair
skin tan while also shielding them from UV radiation in a similar way to those with
matte skin .The medication was developed by a group of American researchers and
is currently undergoing testing in labs. Skin cancer is more common in people with
white skin because this colour lacks melanin, the pigment that gives skin a tan.
Forskolin, an active ingredient produced from the plant Coleus Forskolii, is still
being studied as a cream treatment. The pigment-melanin decient mice with white
leather were able to regain system function with this therapy [94].
9.25 Medicinal Uses of6-(3-Dimethylaminopropionyl)
Forskolin Hydrochloride, or NKH477
6-(3-Dimethylaminopropionyl) forskolin hydrochloride, or NKH477 is the most
powerful water soluble derivative of forskolin to date [97–100]. NKH477 is orally
active, causes various cAMP-dependent actions, and show more attraction towards
adenylyl cyclase type V, the predominant isoform of the enzyme in the heart, which
explains its cardiovascular effects. It’s the rst adenylyl cyclase activator approved
for use in the post-operative treatment of heart surgery patients. After repair of a
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Fig. 9.7 Structure of
6-(3-Dimethylaminopropionyl)
forskolin hydrochloride, or
NKH477
OH
O
O
O
OH
O
O
O
complicated congenital cardiac defect, a baby was effectively weaned off cardiopulmonary bypass with a continuous infusion of NKH477. This was made feasible by
the ineffectiveness of more well-known inotropic drugs such as milrinone poor conjunction with epinephrine and isoproterenol. In Japan, NKH477 [Colforsin daropate
HCl (Adehl® Inj.)] is available for heart failure treatment (Fig.9.7) [101].
Psoriasis is a skin ailment that causes dry, rough, and dead skin to develop on the
scalp, knees, groyne, and lower back. The specic reason is unknown, but experts
believe a weakened immune system is one of the factors. Coleus Forskohlii is one
of the several therapies advised for the skin disease because of its potential to
improve the body’s immune system.
Forskholin is an extract from the tuber of the C. forskholi (wild). Briq plant that
has been shown to have antispasmodic and blood pressure reducing properties. It
has been identied as an adenylate cyclase activator in cardiac membrane of rabbit.
It works by avoiding the receptor and the G protein. The central impact of C.forskholi
does not lower blood pressure; rather, it has a direct vasodilatory effect [102].
Despite the fact that endophytes have been demonstrated to perform a critical
part in demonstrating the capability of the host plant throughout their connection,
the cross-functional inuence of one plant’s endophytes on another plant is still
poorly understood. Native endophytes of Coleus forskohlii (SF1), Macrophomina
pseudophaseolina (SF2), and Fusarium redolens (RF1), extracted from the parts of
stem as well as root effects the growth of plant and increasing the secondary metabolite in medicinal plant Andrographis paniculata, as well as aromatic plants
Artemisia pallens and Pelargonium graveolens [103].
9.26 Coleonol (A Diterpene)
Numerous Coleus spp. have been characterized as remedies for painful micturition,
cardiovascular problems, breathing problems, abdominal colic as well as few CNS
(central nervous system) ailments including sleeplessness and seizures in old Hindu
medicinal texts such as Bhau Prukash Nighantu [104] and Aurvedic materia medica.
The bioactivity of a 50% ethanol extract of Coleus forskohlii, one of the Coleus
species, was investigated. The ndings were published in 1971 [105]. From this
extract, a novel diterpene, coleonol, was identied. It was discovered to have
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S. Aslam etal.
Fig. 9.8 Structure of
Coleonol (A diterpene
taken from Coleus
forskohlii)
O
H
O
H
O
O
H
O
hypotensive and spasmolytic properties. Coleonol, a diterpene synthesized from
Coleus forskohlii, was studied for its therapeutic characteristics (Fig.9.8).
Its main potential is to relax the vascular smooth muscle, which lowers blood
pressure in anaesthetized cats, rats, and rats that are naturally hypertensive. It also
exhibits in vivo benecial inotropic impact on separated rabbit hearts as well as cat
hearts at low dosages. Coleonol has general spasmolytic action on smooth muscle
of the gastrointestinal system in many species but not on guinea pig bronchial musculature. When taken in large doses, coleonol has a depressing impact on the central
nervous system [52].
9.27 Biosynthesis ofForskolin
Forskolin is a labdane-type diterpenoid with the unique complex structure that acts
as a cyclic AMP booster and is used for the remedy of glaucoma and heart
failure.Forskolin occurs naturally in the Coleus forskohlii plant, where it collects in
the root cork, and is used for commercial production. A cascade of events catalyzed
by ve cytochrome P450s (CfCYP76AH8, CfCYP76AH9, CfCYP76AH10,
CfCYP76AH11, CfCYP76AH15) and two acetyltransferases (such as CfACT1–8
and CfACT1-6) converts the precursor of forskolin that is 13R-manoyl oxide into
forskolin and other derivatives of labdane type diterpenoids. The conversion of
13R-manoyl oxide to forskolin is catalysed by at least three P450 enzymes working
together with one acetyl transferase, according to transient expression in Nicotiana
benthamiana (Scheme 9.1) [106].
9.28 Synthesis ofForskolin
Complete synthesis of forskolin was reported, started with reduction of compound (1)
using excess amount of lithium aluminium hydride in the presence of diethyl ether at
temperature ranging from −78°C to 20°C.The reaction mixture then heated from
room temperature to reuxing temperature resulting in the formation of compound (2)
(93%) in the presence of carbonyldimidazol in toluene. Then the reaction underwent
further Clean desilylation and Swern oxidation to give aldehyde derivative (3) (79%).
Adding propynyl lithium to the compound (3) was a tough reaction because of the two
unreactive species and a simple retroaldol process. Other organometallic reagents
13R-manoyl oxide
Deacetyl-forskolin
Forskolin
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O
CYPs
Scheme 9.1 Biosynthesis of Forskolin
OH
O
O
OH
OH
OH
ACT
OH
O
O
O
OH
O
OH
were ineffective with compound (3); retroaldolisation happened even with a premade
propynyl lithium / CeCI3 reagent that did not enolize PhCH2COCH2Ph, as it was
tested before use. Thus, condensation of (3) at −20°C with an additional of propynyl
lithium yielded an intermediate (48%) as a mixture of 2 diastereoisomers, as well as
other retroaldol products; then the intermediate (as 2 diastereoisomers) was oxidized
into the alkynyl ketone (4) (64%) with CrO3-py. As previously reported a similar
chemical [107], conjugate addition of divinyl cuprate in the presence of BF3- Et2O
yielded stereoselectively compound (5) in 61% yield. Lastly from compound (5), forskolin was separated in a 73% total yield (Scheme 9.2) [108].
9.29 Synthesis of6-(3-dimethylaminopropionyl) Forskolin
Hydrochloride/NHK477
6-(3-Dimethylaminopropionyl) forskolin hydrochloride/NHK477 was synthesized
by reacting 7-deacetylforskolin (2.0g), with 3-chloropropionylchloride (1ml) in a
mixture of toluene (100ml), and dry triethylamine (4ml) at 0°C.For 1.5hours, the
reaction mixture was heated to 120°C before being concentrated in a vacuum. The
ltrate was placed in an acetonitrile: water (8:7, 150ml) solution, to which 1N
sodium hydroxide (17ml) was added. For 3days, the reaction mixture was stirred
at room temperature before aqueous dimethyl amine (30–40%, 40ml) was added.
The reaction mixture was then stirred for a further 2h at room temperature prior to
ethyl acetate extraction. The organic layer was washed, dried, and concentrated over
anhydrous sodium sulphate. Purication by chromatography gave the nal product
from the residue. m.p. 140–142°C.Yield 1.4g (Scheme 9.3) [109].
9.30 Synthesis ofVarious Analogues ofColeonol (A
diterpene Isolated fromColeus Forskolin)
Coleonol (forskolin) is a highly potent phytochemical for studying enzyme control,
but its limited solubility in pharmaceutically acceptable solvents prevents it from
undergoing comprehensive biological investigations. After converting four hydroxyl
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H
OONMe
O
OH
H
OH
H
OTBDMS
OH
(1)
OH
OH
(6)
(f)
O
OH
OH
OH
O
OH
2
O
OAc
(a)
H
OO
(2)
O
O
O
O
H
OH
(5)
OTBDMS
OH
O
O
O
OH
(b)
CHO
O
O
OH
O
H
O
O
(3)
(c)
O
O
O
(d)(e)
OH
O
H
O
O
(4)
Scheme 9.2 Synthesis of Forskolin. Reaction conditions; (a) LiAlH4/EtOH (−78°C to R.T); CDI/
toluene (R.T to reux) (b) TBAF, THF, R.T; Swern oxidation; (c) Propynyl lithium, THF, −20°C;
(d) Collins, CH
2N NaOH, MeOH, RT; pTsOH, MeOH/CH
, Room temp; Cs2CO3, MeCN.R.T; (Vinyl)2CuLi, BF3-Et2O, −78°C to RT; (e)
2Cl2
groups into isopropylidene groups, it was chosen to have piperazines at position
C-15. The piperazine pharmacophore was selected due to its long history of usage
in CVS chemotherapy, in addition to the fact that piperazine hydrochloride is hydrophilic in nature. As a result, a hydrophilic counterpart of coleonol (12) was synthsized and its action was documented.
As previously stated, forskolin (7) was extracted from Coleus forskohlii.
7- deacetyl coleonol (tetraol) (8) was obtained by hydrolyzing forskolin with 1N
methanolic NaOH.Intermediate (8) was subsequently treated with acetone in cont.
H2SO4, resulting in 55% and 24% yields of analogues of coleonol (9) and (10),
respectively. -Analogue (9) was allowed to react with meta-perchlorobenzoic acid
, RT; (f) Ac2O/py, 0°C
2Cl2
2
R
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O
OH
O
1
O
OH
OH
OH
O
O
OH
OH
OH
OH
O
R1O
OH
OH
O
O
OCO(CH2)2NR1R
O
OH
OH
O
O
2
R1O
O
OH
O
O
OH
OH
OCO(CH2)2NR1R
O
OH
O
OH
OH
OCO(CH2)2NR1R
O
OH
OH
OCO(CH2)2NR1R
2
2
Scheme 9.3 Synthetic layout of 6-(3-dimethylaminopropionyl) forskolin hydrochloride/NHK477.
in the presence of methanol to produce a 75% yield of analogue (11), which further
reacts with phenyl piperazine to produce a 65% yield of analogue (12). The hydrochloride salt of derivative (12) was obtained by treating it with methanolic HCl
(Scheme 9.4) [110].
9.31 Future Aspects ofColeus
Despite the fact that coleus forskolin is a commercially planted medicinal plant,
wild tubers are still taken, causing habitat degradation. The International Union for
Conservation of Nature (IUCN) has declared that this species needs to be protected
because it is in risk of extinction in the wild.. To lessen the burden on natural habitat,
a procedure for rapid replication of this specie through micropropagation, should be
used to create sufcient planting material for farmers’ advantage. Improved plant
vigour, strong root yield with large forskohlin content, resistance to leaf-eating caterpillars, mealy bugs, nematodes, bacterial infections, and other abiotic challenges
are all desirable characteristics in this variety. Wide hybridization, mutation breeding, biotechnology techniques, and advanced farming elements with post-harvest
technologies will give answers to the aforementioned questions. It is necessary to
get knowledge of the supply and value chain, market data, and prospective opportunities in order to assist farmers and the phytopharmaceutical industry [111].
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