Research Progress on Chemical Constituents and Pharmacological Effects of Celosia L. ()
1. Introduction
Celosia L. is an annual or perennial herb, subshrub, or shrub of the Amaranthaceae. This genus has 60 species in total, most of which are found in subtropical and temperate regions of Africa from which the genus originated, the Americas, and Asia. In China, there are three species of Celosia L: Celosia argentea L., Celosia cristata L. and Celosia taitoensis Hayata, which are grown in the plains, field margins, hills, and slopes [1] . Celosia argentea L. and Celosia cristata L. both of which have a long history of usage as medicines in China and many ancient books record that their seeds have the effect of clearing heat and improving eyesight. Scholars both at home and abroad have conducted substantial studies on this genus in recent years. In this paper, we shall investigate Celosia L.’s chemical constituents and biological functions to provide literature for its further research and exploitation.
2. Main Chemical Components of Celosia L.
In recent decades, it has been found that the chemical constituents contained in Celosia L. are complex and diverse, including flavonoids, triterpenoid saponins, steroids, organic acids, and many other compounds. At present, there are 75 compounds isolated from the genus.
2.1. Flavonoids
Flavonoids, which are water-soluble phenolic compounds, are a common class of bioactive components in plants and one of the most important pharmacologically active components in traditional Chinese medicine [2] . For the first time, Li et al. [3] used enzymatic pretreatment to extract total flavonoids from Celosia cristata L. and the total flavonoids extraction rates of reflux-enzyme and ultrasound-enzyme methods could reach 94.8% and 95%. To investigate the chemical components of Celosia cristata L., Liu et al. [4] utilized ultra-performance liquid chromatography-electrospray quadrupole time-of-flight mass spectrometry (UPLC-ESI-Q-TOF-MS) and preliminarily identified 49 chemical constituents, including 17 flavonoids. A total of 18 flavonoids have been identified from Celosia L. in recent years [5] - [13] , with specific names and structural formulae as follows (Figure 1).
2.2. Triterpenoid Saponin Constituents
Triterpenes are widely distributed in the form of saponins, consisting of triterpene saponin elements and sugars, glyoxylates and other organic substances [14] . Celosia L. is rich in saponin compounds as 24 saponins have been isolated and identified from this genus so far [8] - [20] (Figure 2).
2.3. Steroidal Components
Steroids are another large group of chemical constituents in the Celosia L., and the following five main phytosterols have been reported: β-sitosterol [15] [20] , Stigmasterol [15] [20] , Stigmast-5-en-3-ol [11] , Daucosterol [11] , β-daucosterol [16] . Figure 3 depicts the structures of the compounds mentioned previously.
2.4. Organic Acids
Recently the organic acid components of Celosia L. have become the subject of research. In 2010, Chi et al. [6] isolated two organic acids Palmitic acid-13C, Vanillic acid from the seeds of Celosia cristata L. In 2011, Zhou et al. [11] isolated 2-hydroxyoctadecanoic acid, N-hexadecanoic acid from the seeds of Celosia cristata L. in 2016 Zhang et al. [5] isolated protocatechuic acid, 4-Hydrox-ybenzoic acid from Celosia cristata L. the specific structural formula is shown in Figure 4.
2.5. Cyclic Peptides
Plant cyclic peptides are cyclic nitrogenous compounds generated mostly by amino acid peptide bonds in higher plants. They are an important class of plant metabolites as well as a class of natural small molecules with a high hit rate of lead drug discovery [20] . The cyclic peptide analogues [21] - [29] among the compounds of Celosia L. are shown in Figure 5.
2.6. Other Classes
In addition to the above compounds, several other classes of compounds have
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Figure 2. Triterpenoid saponins in Celosia L.
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Figure 3. Steroidal compounds in Celosia L.
been isolated from Celosia argentea L. for instance, hydroxybenzaldehydes, hydroxy-phenols, chalcone glycosides. In addition, the genus is rich in nutrients, including, proteins, dietary fibre [26] , inorganic elements [27] , trace elements [28] , and vitamins [29] .
3. Pharmacological Effects in Ancient and Modern Times
3.1. Efficacy Attending Certificate
Celosia argentea L. and Celosia cristata L. have more records in ancient books of all ages.
Celosia argentea L. is a commonly used Chinese medicine, which has the effect of clearing liver and clearing fire, brightening eyes and removing opacity. “Medicinal Theory” said, “Bitter flat, non-toxic, treatment of liver heat poison impact eyes, red barrier, green blindness, Yi swollen” [30] , “Southern Yunnan Herbal” “taste sweet bitter, bright eyes” [31] . The above records show that Celosia argentea L.’s bright vision is recognized by doctors of all ages.
The seeds, seedlings, flower roots and flowers of Celosia cristata L. can be used as medicine. It has the effect of astringent hemostasis, band stopping and dysentery stopping. Tang Dynasty “Materia Medica relics” first contained Celosia cristata L. seeds into medicine, said: “Celosia cristata L. seeds, cool, non-toxic. Stop intestinal wind diarrhea blood, red and white dysentery, women collapse in the belt under, medicine.” [9] The medicinal record of Celosia cristata L. seedling was first seen in “Compendium of Materia Medica”, Li Shizhen Yun: “Seedling: smell sweet, cool, non-toxic” [32] , “Indications, sore hemorrhoids and blood disease”, in the “Materia Medica primitive” [33] also has the same record. However, there are few records of the medicine of Celosia cristata L. root, only in the Ming Dynasty “Puji Prescription” there is “blood Yu SAN, treating blood and dirty poison, blood Yu (half two burnt ashes), Celosia cristata L. root, cypress leaf (one or two each) on the end” [34] . The Song Dynasty is the peak of the medicinal use of Celosia cristata L., “Taiping Shenghui prescription” [35] a total of “Celosia cristata L. powder prescription” and other 7 prescriptions used in Celosia cristata L., which is the earliest record of Celosia cristata L. medicine.
3.2. Modern Pharmacological Action
The pharmacological effects of Celosia L. are antibacterial, hepatoprotective, antitumour, antidiabetic, immunomodulatory.
3.2.1. Antibacterial Effect
Wiart et al. [36] studied the antimicrobial activity of 50 traditional plants and showed that the ethanolic extract of Celosia argentea L. possessed significant antimicrobial activity, with strong inhibitory effects against Bacillus cereus, Candida albicans, Pseudomonas aeruginosa and Staphylococcus aureus. Su Baoshun et al. [37] used reflux extraction method to extract the active ingredients from different parts of Celosia argentea L. and carried out in vitro bacteriostatic activity experiments using its agar plate twofold dilution method. The results showed that the diameter of MRSA and Staphylococcus aureus were (25.9 ± 0.2) mm and (21.6 ± 0.5) mm respectively, and the bacteriostatic properties were stable under ultraviolet irradiation, but the bacteriostatic effects were significantly worse at 121˚C, and high temperature treatment should be avoided.
3.2.2. Hepatoprotective Effects
Li et al. [38] observed the therapeutic effect of Celosia argentea L. Celosin A in the model of acute haemorrhagic necrotizing pancreatitis (AHNP) induced by sodium taurocholate in rats. Celosin A significantly reduced the amount of ascites, serum amylase content, TNF-α content and NF-κB protein expression in the liver tissues of the rats. Celosin A was shown to have a strong protective effect against AHNP-induced hepatic damage. Wang et al. [39] showed that a new compound, Cristatain from Celosia argentea L. may cause the protective effect against AHNP-induced hepatic damage, Wang et al. examined the preventive effects of various dosages of Cristatain against mice with liver damage caused by carbon tetrachloride. The findings revealed that Cristatain had a significant protective effect against liver injury as evidenced by the levels of aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase in serum and histopathological examinations being significantly lower than those in the control group.
3.2.3. Anti-Tumour Effects
Wu [40] studied the chemical components of Celosia argentea L. in vitro for antitumor efficacy which showed that Celosin A and Celosin B had good antitumour activity on five types of tumour cells (human glioma cells, human intestinal cancer cells, human leukaemia cells, human breast cancer cells and human hepatocellular carcinoma cells). Jiang [41] established the S180 solid tumour model by instilling the model mice with Celosia cristata L. preparation. When hormonal mass was compared between the experimental and control groups of preparations, it was discovered that the weights of the thymus and spleen in the experimental group were larger than those of the control group.
3.2.4. Antidiabetic Effect
Guo et al. [42] administered a flavonoid extract of Celosia argentea L. by gavage to diabetic mice and discovered that, when compared to the model group, the administered mice’s body mass increased, but their splenic weight index decreased significantly, and their mononuclear macrophage phagocytosis of chicken erythrocytes decreased. In the process of diabetes mellitus, macrophages accumulate and phagocytose normal cells in large quantities, and the flavonoid extract of C. chinensis can reduce the phagocytosis of macrophages in the organism, thus achieving the purpose of preventing and controlling diabetes mellitus.
3.2.5. Immunomodulatory Effects
HaseK et al. [43] demonstrated that Celosia argentea L. glycoside may increase the generation of tumor necrosis factor in mice as well as the synthesis of interleukin-1 and nitric oxide by macrophage J774.1 in a dose-dependent way. Zhang [44] used a xylene-induced mouse ear swelling model and an acetic acid-induced mouse peritoneal capillary permeability paradigm to inject different doses of Celosia argentea L. n-butanol extract into the model mice. The results showed that the inhibition rate of the high-dose group of Celosia cristata L. n-butanol extract was 2 - 3 times that of the low and medium doses. This confirmed the anti-inflammatory effect of n-butanol extract of Celosia cristata L.
3.2.6. Anti-Cardiovascular Effects
Li [45] et al. administered a high-fat diet to a rat model of atherosclerosis before supplementing with Celosia cristata L. extract. When rats were compared to a high-fat control group, TC, aortic wall malondialdehyde (MDA), and serum LDH levels were dramatically reduced, whereas erythrocyte SOD levels were significantly enhanced. It also dramatically increased serum copper and zinc levels in rats while decreasing serum copper/zinc ratio and affecting serum calcium. It was discovered that C. henselae had an antagonistic effect on the rise in serum Cu/Zn ratio caused by a high fat diet. Cu is a major active component of SOD in rat erythrocytes, and increasing SOD value is beneficial for scavenging free radicals. As a result, C. henselae’s anti-atherosclerotic action is linked to its modifying effect on serum Cu, Zn, and Ca levels.
In addition to the pharmacological effects listed above, Celosia L. also has haemostatic [46] , analgesic [47] , protection against oxidative damage to the lens [46] , prevention of osteoporosis [21] , anti-aging [48] , neuroprotection [48] , and enhancement of body tolerance [48] .
4. Conclusions
As of July 2023, a total of 75 compounds have been isolated from Celosia L. including 18 flavonoids, 21 triterpenoid saponins, 5 steroids, 6 organic acids, 11 cyclic peptides, and 14 others., Clearly, flavonoids and triterpenoid saponins are the most dominant chemical constituents in this genus.
According to the literature, Celosia L. has many species and wide distribution, among which Celosia argentea L. and Celosia cristata L. are both Chinese herbal medicines recorded in the 2020 edition of the Chinese Pharmacopoeia, which have considerable medicinal value. The most researched plants in Celosia L. are Celosia argentea L. and Celosia cristata L., while there are few domestic and international literature reports on Celosia taitoensis. This indicates that Celosia L., especially Celosia taitoensis Hayata, is in urgent need of research and development. Corresponding pharmacological studies have shown that the extracts and compounds of Celosia L. have antibacterial, hepatoprotective, antitumour and antidiabetic effects, which provide a basis for the further development and Celosia L. medicinal resources and an essential reference for the research and production of numerous sorts of novel medications.