INTRODUCTION
Depression is a serious medical disorder that impairs mood, energy, sleep, and individual’s capacity to enjoy life. Stress state often disrupts homeostasis, wellbeing, and physiological balance, leading to neurodegenerative disorders and susceptibility to neuro-damage due to activation of the HPA axis, glucocorticoids, oxidative stress, and inflammation [1]. The vivid stress-operated mechanisms leading to depression have been depicted in Figure 1. Clinical research has shown that treating depression has poor therapeutic results [2]. Active ingredients in medicinal plants are crucial for clinical therapeutics due to their multi-pharmacological activities [3]. With regard to the adverse effects, plant-based bioactive compounds hold promise as an alternative to the current pharmaceutical therapies for depression. These molecules also have antioxidant and neuroprotective capabilities. The current review focuses on species from five selected genera (viz. Salvia, Mentha, Rosmarinus, Sideritis, and Scutellaria) of a vast yet unexplored family Lamiaceae in depressive disorders. The reports on antidepressant effects of reported plant species from these genera over the past 10 years of research have been presented.
MATERIALS AND METHODS
Using specific keywords for both whole plant products and plant extracts, such as “antidepressant plants lamiaceae,” “antidepressant extract lamiaceae,” and “antidepressant herbs lamiaceae,” the authors of this review searched internationally recognized databases, including Science Direct, PubMed, and Google scholar. Regarding a targeted search on antidepressant reports of particular plant species beneath each genus, a combination of keywords was employed. A graphical representation of the availability of articles on research done in the past 10 years has been represented in Figure 2.
SPECIES OF THE LAMIACEAE FAMILY WITH ANTIDEPRESSANTS EFFECTS
Salvia genus
Salvia, which means “to save,” is a Latin word that was used to name the genus in reference to its purported medical powers. With 1,000 species, Salvia is a rather varied genus [4]. Salvia genus belongs to the subfamily Nepetoideae in the Lamiaceae family. The existence of more than 100 active chemicals underlies the pharmacological actions of Salvia essential oils.
Figure 1. Basic mechanisms of stress-induced impairments leading to depression. [Click here to view] |
Figure 2. Number of publications according to PubMed. [Click here to view] |
Salvia officinalis
In terms of active main contents, the species holds the highest value among other species. The aqueous leaf extract at an escalating dosage level of up to 1,000 mg/kg has been reported to dramatically lower the duration of mice immobility [5]. The methanolic extract of S. officinalis extract had effects against depression, exhibited anxiolytic action, and may have bioactive components (phenolic, flavonoid, and tannin) that boosted rat learning [6]. Apigenin, Hispidulin, and Cirsimaritin, as well as the diterpenes 7-methoxyrosmanol and galdosol, are among the components of S. officinalis that have been shown to affect benzodiazepine receptor activation [7]. At 300 mg/kg, both alcoholic and aqueous extracts delayed the start of sleep, and has been suggested that S. officinalis can be used to treat insomnia and anxiety [8].
Salvia divinorum
Recreational users of S. divinorum may experience subjective sensations partly due to Salvinorin A’s anxiolytic and antidepressant-like actions, mediated by both k-opioid and endocannabinoid systems [9]. In a study, anhedonia, which is frequent in depression, was reportedly reversed with SalvA [10].
Salvia elegans
Salvia elegans Vahl (Lamiaceae), sometimes referred to as “mirto” is a plant whose leaves and blooms are used to make an infusion that is used to treat CNS disorders in traditional Mexican medicine including insomnia, depression, and anxiety. Aerial fractions of S. elegans containing oleanolic acid (OA), rosifoliol, and agaraspirol have been reported to exhibit anxiolytic and antidepressant effects [11]. Salvia elegans leaf hydroalcoholic extract (60% ethanol) has been shown to provide sedative and antidepressant effects on mice [12,13]. According to a study ursolic acid and 5-O-(6-rhamnosylglucoside)-7-hydroxy-4’-methoxyflavanone extracted from S. elegans leaves, have antidepressant effects [14].
Salvia mirzayanii and Salvia macrosiphon
Salvia mirzayanii and Salvia macrosiphon extracts showed similar antidepressant efficacy, with the hydroalcoholic extract being more efficient than the aqueous extract [15].
Mentha genus
The genus Mentha contains between 13 and 18 species of plants. The genus is widely distributed in North America, Europe, Africa, Asia, and Australia. Mentha piperita, Mentha spicata, Mentha rotundifolia, Mentha arvensis, and Mentha suaveolens are the most popular and widely grown mints for commercial cultivation.
Mentha piperita
Mentha piperita sometimes known as peppermint, is a hybrid species of Mentha aquatica and Mentha spicata L. The plant is one of the most extensively dispersed species in the Lamiaceae family and is found in Europe, Turkey, and a few areas of West Asia. Leaves contain phenolic acids, triterpenes, luteolin, rutin, hesperidin, and fatty acids, with menthol and menthone being the main components of essential oil [16]. Due to M. piperita’s potential as a monoamine oxidase inhibitor, peppermint may have antidepressant properties. The interactions between the dopaminergic, noradrenergic, and serotonergic receptors may be responsible for this effect [17,18]. Researchers suggest that the fraction containing polyphenols and its primary ingredients, rosmarinic acid, eriocitrin, and luteolin-7-O-rutinoside, may contribute to its biological activity [19].
Mentha spicata
The decoction of spearmint leaves is used to treat biliary diseases, menstrual cramps, stomach discomfort, constipation, gingivitis, and ondotalgies. Mentha spicata teas are commonly used by Colombian communities to alleviate stress and insomnia [20]. The Elevated Plus-Maze test showed increased open arm time and longer sleep time in mice treated with M. spicata extract and sodium pentobarbital [21]. The carvone moiety in the essential oil of M. spicata has been considered to contribute toward this activity through a serotonergic mechanism [22]. Recent research evaluated the impact of fresh peppermint leaves and infusions on university students’ mental health. The therapy group’s students reported improved memory, higher sleep quality, and less anxiety [23].
Mentha arvensis
The use of M. arvensis in traditional Korean medicine has been reported to have significant antidepressant potential [24]. Intraperitoneal injections of Japanese mint oil emulsion at dosages of 78, 1,56, and 2,25 l/kg of body weight increased struggle time and also reduced immobility in the Forced swim technique depicting considerable antidepressant and cytotoxic effects [25]. Citronellal, nerol, and linarin are the three primary essential oils extracted from the leaves and flowers of this species. According to in vitro experiments, the α-citronellal has been reported to possess inhibitive activities against the MAO-A enzyme [26].
Mentha pulegium
It is a fragrant plant that is native to America, a member of the Lamiaceae family, and grows in Asia, Ethiopia, Iran, and Western, Southern, and Central Europe. The bulk of the essential oil in this species is composed of a complex mixture of monoterpenes in oxygenated form (76.8%), including menthone, pulegone, neo-menthol, and 8-hydroxy-4(5)-p-menthen-3-one. The species has reportedly been effective in treating anxiety and anxiety symptoms [27]. The length of BALB/c mice immobility in the fast swim test was significantly reduced in a study after M. pulegium administration. The antidepressant effect, however, was not dose-dependent [28].
Rosmarinus genus
The Lamiaceae family’s woody, perennial Rosmarinus plant is native to the Mediterranean Basin and features fragrant, needle-like evergreen leaves.
Rosmarinus officinalis
Rosmarinus officinalis, L., a Mediterranean-native Lamiaceae plant, has a polyphenolic profile consisting of carnosic acid, carnosol, rosmarinic acid, and hesperidin [29]. The chronic administration of hydro-alcoholic extract has been proven to reduce hyperactivity and behavior in olfactory bulbectomized mice [30]. A pentacyclic triterpenoid named ursolic acid from this species has been reported to decrease mice’s immobility in the forced swimming and tail suspension method. In anxiety and depression models, it has been observed that the ethyl acetate, hexane, ethanolic, and essential oil-free fractions, as well as essential oil and the isolated chemicals Saligenin, rosmanol, cirsimaritin, carnosol, and betulinic acid, exhibit CNS effect [31–33]. The extract (distillation residue of essential oil) of R. officinalis, significantly improved depressive and anxiety-like behavior in mice, reversing the alterations in gene expressions caused due to stress [34]. Tyrosine hydroxylase (TH) and pyruvate carboxylase (PC), two important genes were significantly upregulated in PC12 cells treated with R. officinalis polyphenols [35].
Sideritisgenus
More than 150 plant species make up the Sideritis genus, which is mostly found in the Mediterranean region but also occurs in the Atlantic areas, North Africa, and even Norway.
Sideritis scardica
Other names for S. scardica include “Greek tea” and “mountain tea.” The high concentration of flavonoid and phenolic chemicals in S. scardica is thought to be responsible for its pharmacological effects. According to research, Sideritis extract total phenolic content showed potential cognitive, anxiolytic, and antidepressant benefits [36]. Four flavonoids associated with genus Sideritis, include xanthomicrol and isoscutellarein 7-O-[6″′-O-acetyl--D-allopyranosyl-(12)]. Isoscutellarein 7-O-[6″′-O-acetyl--D-allopyranosyl-(12)]--D-glucopyranosideSaligenin and -6″-O-acetyl-D-glucopyranoside have been shown to specifically and permanently block hMAO-A [37]. Sideritis scardica extracts, known for triple monoamine reuptake inhibitors, have the potential for phytochemical therapy in treating mental disorders such as anxiety, depression, attention-deficit hyperactivity disorder, and neurodegenerative diseases [38].
Genus Scutellaria
Scutellaria, has between 360 and 469 recognized species. This genus is responsible for the identification of more than 295 compounds, including flavonoids and diterpenes. Flavonoids and neo-clerodane diterpenoids can be credited with the majority of the bioactivities [39]. Scutellaria is used in various therapeutic settings; however, there has not been much study done on this genus [40].
Scutellaria baicalensis
Flavonoid baicalein from dried roots of this species (Scutellariae radix) inhibits the inflammatory process through peripheral immunological response [41]. Baicalin and baicalein, two of S. baicalensis bioactive ingredients, block MAO A/B and facilitate the release of monoamines, particularly dopamine associated with neurological and psychiatric disorders [42]. Baicalein was found to have effective antidepressant effects which are probably attributed to the suppression of the HMGB1/TLR4/NF-B pathways [43]. It also significantly reduced TLR4 expression, decreased IL-1, IL-6, and TNF- levels in the hippocampus, and improved chronic mild stress-induced depressive-like symptoms [44]. In addition, baicalein has been shown to have antidepressant properties by promoting the differentiation of neurons, their maturation into mature neurons, and their survival [45]. Baicalin treatment significantly enhances hippocampus apoptosis which is thought to contribute to its potent antidepressant effects [46].
Scutellaria lateriflora
The extract of S. lateriflora has been reported to significantly improve global mood without affecting energy or cognition [47]. Baicalin and its aglycone baicalein among flavonoids are known to have anxiolytic activity because of their attachment to the benzodiazepine site of the GABA-A receptor [48].
EVALUATION OF ISOLATED COMPOUNDS IN-VIVO AGAINST DEPRESSION
Except for a few explored genera, there have been very less studies to explore a link between the antidepressant lead moieties and phytoconstituents in different species of the family Lamiaceae. The details of isolated moieties with recent reports on their molecular-level mechanisms against depression have been discussed in Table 1. The published literature from the studied genera indicates that most of the plant-based isolated components as potential candidates against depression fall under the categories of flavones, terpens, terpenoids, polyphenols, or their derivatives. Many of these components mentioned either in the whole plant extracts or in their essential oils have not been evaluated extensively in depression models and present a potential area for further research. For instance, linarin (a glycosylated flavonoid) and Carvone (terpene) were found to be an effective antidepressant principle but their antidepressant mechanism still remains unclear [49,50]. Hispidulin (flavonoid) reported to improve social withdrawal behavior in mice can be further explored for its efficacy and related mechanisms in depressive disorders [51].
Table 1. Details on isolated components from different plant species with proposed mechanism of action in depression. [Click here to view] |
FUTURE PERSPECTIVES AND CONCLUSION
This review explores the potential role of medicinal plants in depressive disorders, revealing promising therapeutic agents. Most extracts were nontoxic and comparable to synthetic drugs. However, the data is preliminary and lacks clear cellular and molecular mechanisms. Future studies should focus on detailed molecular mechanisms, dosages, clinical efficacy, and safety of these extracts and isolated compounds.
AUTHOR CONTRIBUTIONS
All authors made substantial contributions to conception and design, acquisition of data, or analysis and interpretation of data; took part in drafting the article or revising it critically for important intellectual content; agreed to submit to the current journal; gave final approval of the version to be published; and agree to be accountable for all aspects of the work. All the authors are eligible to be an author as per the International Committee of Medical Journal Editors (ICMJE) requirements/guidelines.
FINANCIAL SUPPORT
There is no funding to report.
CONFLICTS OF INTEREST
The authors report no financial or any other conflicts of interest in this work.
ETHICAL APPROVALS
This study does not involve experiments on animals or human subjects.
DATA AVAILABILITY
All data generated and analyzed are included in this research article.
PUBLISHER’S NOTE
This journal remains neutral with regard to jurisdictional claims in published institutional affiliation.
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