Factors affecting psychiatrist hesitation towards epilepsy care and care for patients with epilepsy transitioning from pediatric to adult care: A survey by the Japanese Society of General Hospital Psychiatry.

OBJECTIVE: This study was undertaken by the Epilepsy Subcommittee of the Japanese Society of General Hospital Psychiatry (JSGHP) to explore the challenges faced by psychiatrists in treating epilepsy and the difficulties encountered during the transition of patients with epilepsy (PWE) from pediatric to adult care. METHODS: An online survey targeting 1,980 JSGHP-affiliated psychiatrists was conducted from May to July 2022. The participants were asked to complete a questionnaire on epilepsy care. We analyzed the factors associated with participant hesitancy to treat epilepsy and their professional characteristics. RESULTS: Responses were obtained from 545 of the 1,980 solicited psychiatrists (response rate: 27.5 %). The mean number of years of clinical experience in psychiatry was 20.9 ± 10.3 years. A majority of the psychiatrists were hesitant toward treating epilepsy (89.2 %) and managing the transition of PWE from pediatric services to adult care (83.3 %). Logistic regression analysis showed that the absence of hesitation toward epilepsy treatment was significantly associated with years of clinical experience in psychiatry (OR: 1.05, p = 0.002), being a board-certified epileptologist (OR: 4.36, p = 0.037), having colleagues who are specialists in epilepsy care that may be consulted in the workplace (OR: 2.12, p = 0.027), and general confidence in managing PWE transition from pediatric to adult care (OR 3.54, p < 0.001). Confidence in managing the transition was positively correlated with being a board-certified psychiatrist of the Japanese Society of Psychiatry and Neurology (OR: 4.55, p = 0.048), being a board-certified psychiatrist of the JSGHP (OR: 1.75, p = 0.034), treating six or more PWE per month (OR: 3.54; 95 % CI, p < 0.001), and overall confidence in treating epilepsy (OR: 3.38, p < 0.001). CONCLUSIONS: Alleviation of reluctance to providing epilepsy care and managing the process of transition are correlated; however, the factors influencing each are distinct. To reduce resistance to epilepsy treatment, enhancing the knowledge of epilepsy and creating an environment conducive to consultations are essential. Improving transition-related outcomes, having substantial psychiatric expertise, and increasing opportunities to treat PWE are of great significance. The integration of these approaches may enable psychiatrists to alleviate hesitancy towards epilepsy care and enhance both treatment and transitional care modalities.

Phospholipid-Coated Boronic Oxide Nanoparticles as Boron Agents for Boron Neutron Capture Therapy.

Minimally invasive boron neutron capture therapy (BNCT) is an elegant approach for cancer treatment. The highly selective and efficient deliverability of boron agents to cancer cells is the key to maximizing the therapeutic benefits of BNCT. In addition, enhancement of the frequencies to achieve boron neutron capture reaction is also significant in improving therapeutic efficacy by providing a highly concentrated boron agent in each boron nanoparticle. As the density of the thermal neutron beam remains low, it is unable to induce high-efficiency cell destruction. Herein, we report phospholipid-coated boronic oxide nanoparticles as agents for BNCT that can provide a highly concentrated boron atom in each nanoparticle. The current system exhibited in vitro BNCT activity seven times higher than that of commercial boron agents. Furthermore, the system could penetrate cancer spheroids deeply, efficiently suppressing thermal neutron irradiation-induced growth.

HER-2-Targeted Boron Neutron Capture Therapy with Carborane-integrated Immunoliposomes Prepared via an Exchanging Reaction.

Boron neutron capture therapy (BNCT) is a promising modality for cancer treatment because of its minimal invasiveness. To maximize the therapeutic benefits of BNCT, the development of efficient platforms for the delivery of boron agents is indispensable. Here, carborane-integrated immunoliposomes were prepared via an exchanging reaction to achieve HER-2-targeted BNCT. The conjugation of an anti-HER-2 antibody to carborane-integrated liposomes successfully endowed these liposomes with targeting properties toward HER-2-overexpressing human ovarian cancer cells (SK-OV3); the resulting BNCT activity toward SK-OV3 cells obtained using the current immunoliposomal system was 14-fold that of the l-BPA/fructose complex, which is a clinically available boron agent. Moreover, the growth of spheroids treated with this system followed by thermal neutron irradiation was significantly suppressed compared with treatment with the l-BPA/fructose complex.

Carborane bearing pullulan nanogel-boron oxide nanoparticle hybrid for boron neutron capture therapy.

Boron neutron capture therapy shows is a promising approach to cancer therapy, but the delivery of effective boron agents is challenging. To address the requirements for efficient boron delivery, we used a hybrid nanoparticle comprising a carborane = bearing pullulan nanogel and hydrophobized boron oxide nanoparticle (HBNGs) enabling the preparation of highly concentrated boron agents for efficient delivery. The HBNGs showed better anti-cancer effects on Colon26 cells than a clinically boron agent, L-BPA/fructose complex, by enhancing the accumulation and retention amount of the boron agent within cells in vitro. The accumulation of HBNGs in tumors, due to the enhanced permeation and retention effect, enabled the delivery of boron agents with high tumor selectivity, meeting clinical demands. Intravenous injection of boron neutron capture therapy (BNCT) using HBNGs decreased tumor volume without significant body weight loss, and no regrowth of tumor was observed three months after complete regression. The therapeutic efficacy of HBNGs was better than that of L-BPA/fructose complex. BNCT with HBNGs is a promising approach to cancer therapeutics.

Tumor-targeting hyaluronic acid/fluorescent carborane complex for boron neutron capture therapy.

In cancer therapeutics, boron neutron capture therapy (BNCT) requires a platform for selective and efficient 10B delivery into tumor tissues for a successful treatment. However, the use of carborane, a promising candidate with high boron content and biostability, has significant limitations in the biomedical field due to its poor water-solubility and tumor-selectivity. To overcome these hurdles, we present in this study a fluorescent nano complex, combining fluorescent carborane and sodium hyaluronate for high boron concentration and tumor-selectivity. Tumor cells actively internalized the complex through binding hyaluronan to CD44, overexpressed on the tumor cell surface. Furthermore, the subcellular distribution of this complex could also be detected due to its fluorescent properties. Moreover, after thermal neutron irradiations, the complex produced excellent cytotoxicity, equal to or greater than that of the clinically-used BPA-fructose. Therefore, this novel complex could be potentially more suitable for BNCT than the boron agent.

S-allyl-glutathione improves experimental liver fibrosis by regulating Kupffer cell activation in rats.

S-allyl-glutathione (SAG) is one of the metabolites of diallyl sulfide (DAS), a component of garlic. DAS has shown preventative effects on carcinogenesis in animal models. However, whether synthetic SAG can improve liver fibrosis has not been investigated. We examined the potential preventive effects of SAG on acute and chronic models of liver fibrosis by chronic carbon tetrachloride (CCl4) administration. SAG inhibited liver fibrogenesis induced by CCl4 in a dose-dependent manner and reduced heat shock protein-47 (HSP47), a collagen-specific chaperone, and other fibrosis markers. In fibrosis regression models, after administration of either CCl4 for 9 wk or dimethyl nitrosamine (DMN) for 6 wk, SAG markedly accelerated fibrolysis in both models. In the regression stage of DMN-treated liver, SAG normalized the ratio of M2 phenotype (expression of mannose receptor) in Kupffer cells (KCs). Consistent with these results, the culture supernatants of SAG-treated M2-phenotype KCs inhibited collagen-α1(I) chain (COL1A1) mRNA expression in primary culture-activated rat hepatic stellate cells (HSCs). However, SAG did not directly inhibit HSC activation. In an acute model of CCl4 single injection, SAG inhibited hepatic injury dose dependently consistent with the inhibited the elevation of the bilirubin and ALT levels. These findings suggest that SAG could improve the fibrogenic and fibrolysis cascade via the regulation of excess activated and polarized KCs. SAG may also serve as a preventive and therapeutic agent in fibrosis of other organs for which current clinical therapy is unavailable. NEW & NOTEWORTHY S-allyl-glutathione (SAG) is a metabolite of diallyl sulfide, a component of garlic. SAG increased hepatic glutathione levels and GSH-to-GSSG ratio in normal rats. SAG treatment before or after liver fibrosis from chronic CCl4 administration improved liver fibrosis and regression. SAG decreased heat shock protein-47 (HSP47), a collagen-specific chaperone, and other fibrosis markers in CCl4-treated livers. SAG-treated Kupffer cell conditioned medium also inhibited collagen-α1(I) chain (COL1A1) mRNA expression and other markers in primary culture hepatic stellate cells.

Therapeutic administration of an ingredient of aged-garlic extracts, S-allyl cysteine resolves liver fibrosis established by carbon tetrachloride in rats.

S-allyl cysteine (SAC) is the most abundant compound in aged garlic extracts (AGEs). AGE has been reported to ameliorate the oxidative damage implicated in a variety of diseases. However, the effects of SAC have not been established in liver cirrhosis. The aim of this study was to examine the effect of therapeutic administration of SAC in liver cirrhosis by chronic carbon tetrachloride (CCl4) administration in rats. SAC or other cysteine compounds were administered from 4 weeks when liver fibrosis was confirmed to be in process. CCl4 administration elevated plasma alanine aminotransferase, plasma lipid peroxidation, liver hydroxyproline, and liver transforming growth factor (TGF)-ß at 12 weeks. SAC prevented these changes induced by CCl4. Furthermore, SAC improved survival in a dose-dependent manner following consecutive CCl4 administration. The inhibitory mechanisms may be associated with a decrease in the profibrogenic cytokine, TGF-ß as well as the antioxidative properties of SAC.

Effects of psychosocial functioning, depression, seizure frequency, and employment on quality of life in patients with epilepsy.

This study aimed to investigate the quality of life (QOL) in patients with epilepsy and its correlation with psychosocial impact, depression, seizure-related items, and living circumstances. One hundred two patients who visited the epilepsy clinic at Nagoya City University Hospital participated in this study. We used the Quality of Life in Epilepsy Inventory-31-P (QOLIE-31-P) as a measure of QOL, the Neurological Disorders Depression Inventory for Epilepsy (NDDI-E) as the screening instrument for rapid detection of major depression, and the Side Effects and Life Satisfaction Inventory (SEALS) to evaluate psychosocial functioning, seizure-related items, and living circumstances. Significant correlations of the QOLIE-31-P overall score with these questionnaires and seizure-related or demographic variables were identified and analyzed by stepwise linear regression. The QOLIE-31-P overall score correlated significantly with the NDDI-E, SEALS overall score, number of anticonvulsants, frequency of focal seizure with impairment of consciousness or awareness (focal seizure), sheltered work, and employment. The stepwise linear regression showed that the QOLIE-31-P overall score was explained by the effects of psychosocial functioning, depression, frequency of focal seizure, and employment, in that order, with these factors explaining 74% of the variance. Thus, using both the SEALS and NDDI-E may be useful to detect some aspects of QOL in clinical settings.

S-Allyl cysteine improves nonalcoholic fatty liver disease in type 2 diabetes Otsuka Long-Evans Tokushima Fatty rats via regulation of hepatic lipogenesis and glucose metabolism.

It is important to prevent and improve diabetes mellitus and its complications in a safe and low-cost manner. S-Allyl cysteine, an aged garlic extract with antioxidant activity, was investigated to determine whether S-allyl cysteine can improve type 2 diabetes in Otsuka Long-Evans Tokushima Fatty rats with nonalcoholic fatty liver disease. Male Otsuka Long-Evans Tokushima Fatty rats and age-matched Long-Evans Tokushima Otsuka rats were used and were divided into two groups at 29 weeks of age. S-Allyl cysteine (0.45% diet) was administered to rats for 13 weeks. Rats were killed at 43 weeks of age, and detailed analyses were performed. S-Allyl cysteine improved hemoglobinA1c, blood glucose, triglyceride, and low-density lipoprotein cholesterol levels. Furthermore, S-allyl cysteine normalized plasma insulin levels. S-Allyl cysteine activated the mRNA and protein expression of both peroxisome proliferator-activated receptor α and γ, as well as inhibiting pyruvate dehydrogenase kinase 4 in Otsuka Long-Evans Tokushima Fatty rat liver. Sterol regulatory element-binding protein 1c and forkhead box O1 proteins were normalized by S-allyl cysteine in Otsuka Long-Evans Tokushima Fatty rat liver. In conclusions, these findings support the hypothesis that S-allyl cysteine has diabetic and nonalcoholic fatty liver disease therapeutic potential as a potent regulating agent against lipogenesis and glucose metabolism.

HER-2-targeted boron neutron capture therapy using an antibody-conjugated boron nitride nanotube/ß-1,3-glucan complex.

The development of boron agents with integrated functionality, including biocompatibility, high boron content, and cancer cell targeting, is desired to exploit the therapeutic efficacy of boron neutron capture therapy (BNCT). Here, we report the therapeutic efficacy of BNCT using a HER-2-targeted antibody-conjugated boron nitride nanotube/ß-1,3-glucan complex. The anticancer effect of BNCT using our system was 30-fold that of the clinically available boron agent l-BPA/fructose complex.

Protein recognition of hetero-/homoleptic ruthenium(II) tris(bipyridine)s for α-chymotrypsin and cytochrome c.

We examined the relationship between the structures of hetero-/homoleptic ruthenium(II) tris(bipyridine) metal complexes (Ru(II)(bpy)(3)) and their binding properties for α-chymotrypsin (ChT) and cytochrome c (cyt c). Heteroleptic compound 1a binds to both ChT and cyt c in 1:1 ratio, whereas homoleptic 2 forms 1:2 protein complex with ChT but 1:1 complex with cyt c. These results suggest that the structure of the recognition cavity in Ru(II)(bpy)(3) can be designed for shape complementarity to the targeted proteins. In addition, Ru(II)(bpy)(3) complexes were found to be potent inhibitors of cyt c reduction and to permeate A549 cells.

EEG correlates of quality of life and associations with seizure without awareness and depression in patients with epilepsy.

AIMS: Quality of life (QOL) is an important issue for not only patients with epilepsy but also physicians. Depression has a large impact on QOL. Nonlinear electroencephalogram (EEG) analysis using machine learning (ML) has the potential to improve the accuracy of the diagnosis of epilepsy. Therefore, in this study, we examined EEG nonlinearity, EEG correlates of QOL in patients with epilepsy, and the accuracy of EEG for the interval from seizure without awareness (SA-) and for depression, using ML. METHODS: The Side Effects and Life Satisfaction (SEALS) inventory was used to assess QOL, and the Neurological Disorders Depression Inventory for Epilepsy (NDDI-E) was used as a screening tool for depression on the date of the EEG recording. EEG with wavelet denoising (WD), the Savitzky-Golay filter, and non-denoising were created in combination with low- and high-pass filters. These EEG sets were adopted for phase space reconstruction methods. Using a generalized linear mixed-effects model for SEALS, sample entropy as a measurement of regularity, SA-, seizure with awareness, and depression were examined. RESULTS: WD and non-denoising EEG sets in the bilateral posterior temporal-occipital, centro-parietal, parieto-occipital, and Fz-Cz of the 10-20 method were associated with SEALS and demonstrated nonlinearity, and the moderate effects of classification for the interval elapsed from SA- and for depression. When the intervals from SA- were added, the effects of the EEG classification for depression increased. CONCLUSION: These findings suggest that EEG regions associated with QOL showing nonlinearity are useful for classifying SA- and depression.

Biological activity of water-soluble inclusion complexes of 1'-acetoxychavicol acetate with cyclodextrins.

1'-Acetoxychavicol acetate (ACA), isolated from the rhizomes and the seeds of the Zingiberaceae plant, has a variety of biological activities such as antitumor, antiallergic and repellent effects. However, ACA seems to have some disadvantages which may limit for future possible clinical applications, for example, its poor water solubility. Furthermore, ACA is not stable in aqueous solutions and undergoes hydrolysis and/or isomerization. To improve the solubility and stability of ACA in water, we prepared the inclusion complexes with various ß-cyclodextrins (ß-CDs).In aqueous solution, the association constants of ACA with various CDs were estimated at 662±95 (ß-CD), 336±70 (methyl-ß-CD, Meß-CD), and 322±44M(-1) (hydroxypropyl-ß-CD, HPß-CD), respectively, by a spectrofluorometric displacement method based on competition between a guest and a fluorescent probe for CDs. It was revealed that almost all ACAs existed as a free molecule in the CD-containing aqueous solution. However, in the case of preparing the inclusion complexes of CDs with ACA by a solid phase 'high-speed vibration milling' technique, the average inclusion rates of the obtained water-soluble complexes were calculated as 88±13% (ß-CD), 70±1% (Meß-CD), and 63±2% (HPß-CD), respectively, by (1)H NMR analysis. To characterize the structures of the CD·ACA complexes, 2,3,6-trimethyl-ß-CD (TMeß-CD)·ACA complex was prepared as a model compound (inclusion rate: 40%). As a result of 2D ROESY experiments, it was considered that the aromatic ring of ACA is located in the narrow side of the hydrophobic cavity of the TMeß-CD and both 1'- and 4-acetoxy groups of ACA positioned in the vicinity of the secondary and primary methoxy groups of TMeß-CD, respectively. Furthermore, we examined the apoptogenic activity of CD·ACA complexes to evaluate whether or not the bioactivities of ACA were affected by their inclusion. Although the cytotoxicity of all CD·ACA complexes in human epithelial carcinoma HeLa cells and murine adenocarcinoma colon26 cells were diminished as compared with the ACA alone, only HPß-CD·ACA maintained high levels of activity. In addition, HPß-CD·ACA, and Meß-CD·ACA showed suppressive effect for the transcription factor NF-κB activation on LPS-activated murine macrophage RAW264.7 cells and the former was more active complex. Furthermore, HPß-CD·ACA inhibited the in vivo tumor growth of tumor-bearing mice, although the activity was slightly weak compared with that of free ACA. These results indicate that HPß-CD is the best host molecule for ACA to form a water-soluble complex with the similar biological activity of free ACA.

Ictal physiological characteristics of remitters during bilateral electroconvulsive therapy.

Ictal heart rate (HR) and postictal suppression in ictal EEG are believed to be predictive of the therapeutic efficacy of eletroconvulsive therapy (ECT) for depression. However, regarding ictal peak HR, previous studies investigated ictal HR on only one or two occasions during the course of ECT. We prospectively examined whether two physiological parameters, ictal peak HR and postictal suppression in ictal EEG, during every session, including those with abortive seizure, predicted ECT efficacy. Ictal peak HR and postictal suppression index were analyzed in 53 consecutive inpatients with depression using generalized estimating equations analysis, which corrects for the repeated nature of the observations. The peak HR and postictal suppression index were associated with therapeutic efficacy in remitters during sessions with adequate seizure. The physiological characteristics of the remitters included lower peak HR, lower stimulus energy, and higher postictal suppression index. However, these results could not be generalized, and are limited to non-atropine conditions and bilateral ECT.

Intraclass correlations of seizure duration by wavelet transform, sample entropy, and visual determination in electroconvulsive therapy.

Although electroconvulsive therapy seizure duration has been shown to have limited relevance to efficacy, seizure duration remains important for clinically valid stimulus efficiency. There has been no report on seizure duration using sample entropy with Thymatron (Somatics, Inc), which is widely used in Japan. Furthermore, wavelet transform analysis is also suitable for a seizure because of the wide range of dominant frequencies. Therefore, in this study with Thymatron, the intraclass correlations of seizure duration determined by sample entropy, wavelet transform, and visual determination were investigated to determine whether these methods were applicable for clinical use. Wavelet transform, sample entropy, and the human rater had high intraclass correlations for seizure duration. The present results indicate that wavelet transform and sample entropy can be useful in the clinical electroconvulsive therapy setting, and they may also be suitable for clinical research into the mechanisms of the generalized tonic-clonic seizures related to the efficacy of electroconvulsive therapy.

Cytochrome c-binding "proteo-dendrimers" as new types of apoptosis inhibitors working in HeLa cell systems.

The suppressive effects of synthetic dendrimers on mitochondrial apoptosis were first demonstrated in human epithelial carcinoma HeLa cells. The employed proteo-dendrimers included polyanionic hepta(glutamic acids), a fluorescent zinc porphyrinate core, hydrophilic polyether surface and nonpeptide hydrophobic dendrons, and electrostatically interacted with cytochrome c in aqueous solutions. The ceramide analogue, (2S,4E)-2-acetylamino-3-oxo-4-octadecen-1-ol (C2-ketoCer) induced mitochondrial apoptosis into HeLa cells and the cell viability was significantly recovered by pretreatment with some dendrimers. Among a series of proteo-dendrimers, the second-generation dendrimer 2a had the lowest cytotoxicity and the highest solubility. When the cells were treated with this dendrimer, a decrease in the protein levels of active caspase-3 and proteolytically cleaved PARP was remarkably observed. Since cytochrome c release from the mitochondria to the cytoplasm was unaffected in the presence of dendrimer 2a, the observed suppressive effects probably indicate that the proteo-dendrimer trapped cytochrome c, not only in the aqueous solutions but also in the living cells..

Neural correlates of memory in depression measured by brain perfusion SPECT at rest.

AIM: Brain metabolism activated studies have indicated associations between memory and the anterior cingulate cortex and hippocampus in patients with depression. The aim of the present study was therefore to investigate memory function, measured as performance on the Wechsler Memory Scale-Revised (WMS-R), and its relationship to brain perfusion using single-photon emission computed tomography (SPECT) at rest in patients with depression. METHODS: The Hamilton Rating Scale for Depression (HAMD) and WMS-R were measured for 17 patients with depression by an independent clinical evaluation team. Voxel-based correlation analyses were performed with statistical parametric mapping at an extent threshold of 200 voxels. Associations were controlled for state and trait factors. RESULTS: WMS-R measurements of verbal, visual, and general memory were inversely correlated with brain perfusion in the right anterior cingulate cortex, left premotor cortices, and both regions, respectively. The HAMD directly correlated with brain perfusion in the right anterior cingulate cortex. CONCLUSION: Brain perfusion SPECT measurements of the anterior cingulate cortex at rest were associated with the severity of depression and immediate memory scores measured with the WMS-R.

Adequacy of continuation and maintenance treatments for major depression in Japan.

Guidelines for treating depression often recommend continuing antidepressants at least for 6 months after remission. Whether this recommendation is implemented in daily practices represents a serious concern. We aimed to examine adequacy of continuation and maintenance treatment in Japan. A naturalistic prospective follow-up study with mood disorders was undertaken in 23 psychiatric departments from all over Japan. A total of 95 patients diagnosed with major depression were followed up every month until treatment termination and every 6 months thereafter. In this study, the cohort received 45.1 (SD = 64.7) mg of imipramine or equivalent per day during continuation phase, and about 74% were prescribed inadequate doses, i.e. less than 75 mg/day. At maintenance phase immediately before relapse, average dosage was 42.0 (SD = 74.7) mg/day and 83% were prescribed inadequate doses. There is gross under-treatment of depression during continuation and maintenance phases in Japan.

Inhibitory effect of enamel matrix derivative on osteoblastic differentiation of rat calvaria cells in culture.

BACKGROUND AND OBJECTIVE: The effect of enamel matrix derivative (EMD) on bone differentiation remains unclear. Transforming growth factor beta1 (TGF-beta1) is reported to be contained in EMD. The aim of this study was to clarify the effect of EMD on osteoblastic cell differentiation and the possible role of TGF-beta1. MATERIAL AND METHODS: Fetal rat carvarial cells were treated with 10, 50 or 100 microg/ml EMD for 5-17 days. Alkaline phosphatase (ALP) activity and bone nodule formation were measured, and mRNA expressions of bone matrix proteins and core binding factor were analysed. RESULTS: Enamel matrix derivative inhibited ALP activity from the early stage of culture (29-44% inhibition) on days 5 and 10 and decreased bone nodule formation by 37-67% on day 17. These effects of EMD were concentration dependent. Enamel matrix derivative inhibited mRNA expression of osteocalcin and core binding factor. A high level of the active form of TGF-beta1 protein was detected in the conditioned medium treated with 100 microg/ml EMD. Treatment with TGF-beta1 antibody partly restored the inhibitory effect of EMD on ALP activity. CONCLUSION: Enamel matrix derivative inhibited the osteoblastic differentiation of rat carvarial cells and this was partly mediated by an increase in the activated form of TGF-beta1, suggesting that EMD may function initially to inhibit osteoblastic differentiation to allow a predominant formation of other periodontal tissues.

(1'S)-Acetoxychavicol acetate and its enantiomer inhibit tumor cells proliferation via different mechanisms.

Elucidation of the mechanisms underlying potential anticancer drugs continues and unraveling these mechanisms would not only provide a conceptual framework for drug design but also promote use of natural products for chemotherapy. The biological effects of (1'S)-acetoxychavicol acetate ((S)-ACA) have been widely investigated. However, in most cases, a natural product or synthetic racemic compound was used in the study. In this study, we prepared (S)-ACA and its enantiomer (R)-ACA by a lipase-catalyzed esterification method and sought to determine the mechanisms of action of (S)-ACA and (R)-ACA in the growth inhibitory effect in Ehrlich ascites tumor cells (EATC). (S)-ACA caused an accumulation of tumor cells in the G1 phase of the cell cycle, which was accompanied by a decrease in phosphorylated retinoblastoma protein (Rb), an increase in Rb and a decrease in the phosphorylation of p27kip1. However, (R)-ACA caused an accumulation of tumor cells in the G2 phase of the cell cycle, an increase in hyperphosphorylated Rb and an increase in the phosphorylation of p27kip1. The results obtained in the present study demonstrate for the first time, to the best of our knowledge, that both (S)-ACA and (R)-ACA caused the inhibition of tumor cells growth but the inhibition was caused via different mechanisms.