Tuning spacer length improves the functionality of the nanobody-based VEGFR2 CAR T cell.

BACKGROUND: The chimeric antigen receptor-expressing T (CAR-T) cells for cancer immunotherapy have obtained considerable clinical importance. CAR T cells need an optimized intracellular signaling domain to get appropriately activated and also for the proper antigen recognition, the length and composition of the extracellular spacer are critical factors. RESULTS: We constructed two third-generation nanobody-based VEGFR2-CARs containing either IgG1 hinge-CH2-CH3 region or hinge-only as long or short extracellular spacers, respectively. Both CARs also contained intracellular activating domains of CD28, OX40, and CD3ζ. The T cells from healthy individuals were transduced efficiently with the two CARs, and showed increased secretion of IL-2 and IFN-γ cytokines, and also CD69 and CD25 activation markers along with cytolytic activity after encountering VEGFR2+ cells. The VEGFR2-CAR T cells harboring the long spacer showed higher cytokine release and CD69 and CD25 expression in addition to a more efficient cytolytic effect on VEGFR2+ target cells. CONCLUSIONS: The results demonstrated that the third-generation anti-VEGFR2 nanobody-based CAR T cell with a long spacer had a superior function and potentially could be a better candidate for solid tumor treatment.

The protective effects of astaxanthin on pre-antral follicle degeneration in ovine vitrified/warmed ovarian tissue.

This study assesses the protective effects of astaxanthin (AST) against vitrification/warming-induced cryoinjuries of ovarian tissue slices in sheep. Cortical slices of slaughterhouse acquired-ovine ovaries were randomly distributed in different groups: fresh, toxicity, and five vitrification groups including vitrification in presence of 0 (control group), 1, 10 and 100 µM astaxanthin or 100 µM vitamin E. After vitrification/warming and 24 h culturing, the samples were subjected to histological studies, antioxidant evaluation by TAC and TBAR assays, and assessment of relative expression of BMP4, BMP15, GDF9 and KITLG genes related to folliculogenesis and follicular growth regulation. According to the results, vitrification reduced the percentage of morphologically intact follicles compared to the fresh and toxicity groups (p < 0.05). In vitrification groups, vitamin E and all three concentrations of AST increased the percentage of intact pre-antral follicles and antioxidant activity relative to the vitrified control (p < 0.05). This enhancement significantly occurred in 10 µM AST group more than vitamin E (p < 0.05). Also, 10 µM concentration of AST enhanced the expression of all the examined genes compared to the control (p < 0.05), while the expression of BMP4, BMP15 and KITLG was higher in the AST than vitamin E (p < 0.05). The latter could increase only the expression of GDF9 compared to the control group (p = 0.011). In conclusion, AST is a highly effective antioxidant for maintaining the survival of pre-antral follicles, retaining cell density, increasing total antioxidant capacity, and increasing the expression of some genes related to follicular development after short-term culture of vitrified/warmed ovarian tissue slices.

Comparison of outcomes and complications in conventional versus ultrasound-accelerated catheter directed thrombolysis for treatment of pulmonary embolism: A systematic review and meta-analysis.

BACKGROUND: Acute submassive a massive pulmonary embolism are known as leading causes of cardiovascular morbidity and mortality in emergency departments. Choosing the optimal type of catheter directed thrombolysis (CDT) for treatment of pulmonary embolism presents a quandary to the practitioners. To the best of our knowledge, there is no meta-analysis comparing superiority of conventional CDT and ultrasound-accelerated catheter directed thrombolysis (USACDT). Therefore, in this meta-analysis, we aimed to compare conventional CDT with USACDT regarding clinical outcomes and safety profile. METHODS: A systematic literature search of previous published studies comparing conventional CDT with USACDT regarding clinical outcomes and safety profile was carried out in the electronic databases including MEDLINE, Scopus, EBSCO, Google Scholar, Web of Science, and Cochrane from inception to December 2021. Data were analyzed by comprehensive meta-analysis software (CMA, version 3). RESULTS: The meta-analysis included nine studies with a total of 705 patients. Our meta-analysis showed that there is no significant difference between two groups with respect to pulmonary arterial systolic pressure (SMD: -0.084; 95% CI: -0.287 to 0.12; p: 0.41), RV/LV (SMD: -0.003; 95% CI: -0.277 to 0.270; p: 0.98), and Miller score (SMD: -0.345; 95% CI: -1.376 to 0.686; p: 0.51). Similarly, we found no statistically significant differences between two groups regarding major and minor bleeding (p > .05). CONCLUSION: Our meta-analysis showed that when compared with USACDT, conventional CDT provides similar clinical and hemodynamic outcomes or safety for treatment of pulmonary embolism without the need for very expensive technologies. However, randomized clinical trials are required to further investigate cost-effectiveness of USACDT in comparison with conventional CDT.

Effect of diet low in advanced glycation end products on appetite, body composition, and brown adipose tissue markers in patients with coronary artery disease treated with angioplasty: A randomized controlled trial.

Background: Recent changes in dietary habits have resulted in increased intake of advanced glycation end products (AGEs), which are known to have a predominant contribution to the pathogenesis and complications of coronary artery disease (CAD). AGEs are also thought to induce weight gain by affecting appetite, energy expenditure, and brown adipose tissue (BAT). Here, we investigated whether the restriction of dietary AGEs could affect appetite, body composition, anthropometric indices, and BAT-derived markers in CAD patients treated with angioplasty. Materials and Methods: Forty-two stented CAD patients were randomly allocated into two groups that received either a low-AGEs or a control diet for 12 weeks. At baseline and postintervention, fasting blood samples were analyzed for total AGEs, nesfatin-1, and BAT-derived markers (fibroblast growth factor 21 and neuregulin 4). Subjective appetite ratings and body composition were evaluated using the Visual Analog Scale (VAS) and bioelectric impedance analysis. Anthropometric indices, including fat mass index (FMI), abdominal volume index (AVI), and body adiposity index (BAI), were calculated through the relevant formula. Results: Restricting dietary AGEs for 12 weeks could cause a significant reduction in weight, FMI, AVI, and BAI (P < 0.05) compared to the comparison group. In addition, VAS data analyses indicated a significant decrease in the sense of hunger and prospective food intake (P < 0.05) in the intervention group compared to the comparison group. No significant difference was seen in the measured biochemical markers between the two groups. Conclusion: This study indicated that the low-AGEs diet could decrease appetite, weight, and anthropometric indices in stented CAD patients.

Comparison of ultrasound-accelerated versus conventional catheter-directed thrombolysis for deep vein thrombosis: A systematic review and meta-analysis.

BACKGROUND: Recent in vitro and clinical studies have shown that ultrasound-accelerated catheter-directed thrombolysis (USACDT) can accelerate thrombolysis. Therefore, in this meta-analysis, we aimed to compare the efficacy and safety of USACDT with conventional catheter-directed thrombolysis in patients with deep vein thrombosis. METHODS: A systematic search of the following electronic databases was performed from their dates of inception to 20 June 2020: MEDLINE, Scopus, Google Scholar, CINAHL, Cochrane Library, and EMBASE. All randomized controlled trials that directly compared the complications and efficacy of USACDT and conventional catheter-directed thrombolysis in patients with deep vein thrombosis were identified. The statistical analysis was performed using comprehensive meta-analysis software. RESULTS: Finally, 18 studies with a total of 597 participants were included in our meta-analysis according to the eligibility criteria. Pooled proportion of USACDT success in patients with deep vein thrombosis was 87.8% (18 studies; 95% CI: 83.1-91.3). Success rate was significantly higher in USACDT treatment than in conventional catheter-directed thrombolysis treatment (seven studies; OR: 2.96; 95% CI: 1.69-5.16; P < 0.01)). Although the mean infusion time was higher in catheter-directed thrombolysis treatment compared to USACDT treatment, this difference was not statistically significant (three studies; MD: -1.46; 95% CI: -3.25-0.32; P = 0.10). Moreover, pooled rate of complications was lower in USACDT than catheter-directed thrombolysis which was not statistically significant (seven studies; OR: 0.49; 95% CI: 0.13-1.76; P = 0.27). CONCLUSION: This meta-analysis revealed that USACDT significantly increased the success rate of thrombolysis compared to conventional catheter-directed thrombolysis. Furthermore, USACDT was associated with lower rate of complication and infusion time. Taken together, these findings confirm the superiority of this novel intervention over conventional catheter-directed thrombolysis in treatment of patients with deep vein thrombosis.

Correlation between aryl hydrocarbon receptor and IL-17+ and Foxp3+ T-cell infiltration in bladder cancer.

Bladder cancer (BC) is one of the most prevalent cancers around the world and, if not treated well, has high morbidity and mortality. Many studies have indicated that there may be various roles for the aryl hydrocarbon receptor (AHR) in the immune system. The aim of this study was to determine the frequency of Foxp3+ regulatory T (Treg) and T helper 17 cells (Th17) in BC tissue in comparison with controls and determine the relationship between AHR, Foxp3+ Treg and Th17 cells in BC. A total of 40 patients with BC were enrolled in this study. The control group was selected from non-tumoural parts of bladder tissues from the patients who have undergone cystoscopy. The percentage of regulatory T cells (Foxp3+ /CD4+ ) and Th17 (IL-17+ /CD4+ ), as well as AHR+ cells in BC tissues and controls, were determined by immunohistochemistry. The results of this study showed that the number of Foxp3+ Treg and Th17 is significantly higher in bladder tumour tissues in comparison with non-tumoural tissues. Also, the percentage of AHR+ lymphocytes and AHR+ cells was increased significantly in bladder tumour tissues rather than non-tumoural tissues. This study also found a relation between AHR and Foxp3+ /CD4+ T lymphocytes ratio cells in BC. The percentage of Foxp3+ Tregs and AHR+ cells were significantly correlated with the grade and stage of BC. An increase in the percentage of Foxp3+ Treg and Th17 cells may play an important role in tumour immunity; and determining the relationship between AHR and differentiation of Th17/Foxp3+ Treg in BC can lead to a potential cancer therapeutic possibility.

Comparing the frequency of CD33+ pSTAT3+ myeloid-derived suppressor cells and IL-17+ lymphocytes in patients with prostate cancer and benign prostatic hyperplasia.

Prostate cancer (PCa) is one of the most epidemic types of cancer in men. The tumor microenvironment (TME) of PCa is involved in the emergence of immunosuppressive factors such as myeloid-derived suppressor cells (MDSC), which regulate the immune system by several mechanisms, including interleukin (IL)-10 production. On the other hand, IL-17+ helper T cells (Th17) induce MDSCs and chronic inflammation in TME by producing IL-17. This study demonstrated that the frequency of CD33+ pSTAT3+ MDSC and IL-17+ lymphocyte as well as IL-10 messenger RNA (mRNA) expression were significantly higher in the PCa patients than in the benign prostatic hyperplasia (BPH) group. Moreover, there was no significant relationship between the frequency of CD33+ pSTAT3+ MDSC, and IL-17+ lymphocyte with Gleason scores in the PCa group. We suggested that the higher frequency of CD33+ pSTAT3+ MDSC and IL-17+ lymphocyte and the more frequent expression of IL-10 mRNA in PCa patients may play roles in tumor progression from BPH to PCa.

Construction of a chimeric antigen receptor bearing a nanobody against prostate a specific membrane antigen in prostate cancer.

Adoptive transfer of T cells expressing chimeric antigen receptors (CARs) is considered to be a novel anticancer therapy. To date, in most cases, single-chain variable fragments (scFvs) of murine origin have been used in CARs. However, this structure has limitations relating to the potential immunogenicity of mouse antigens in humans and the relatively large size of scFvs. For the first time, we used camelid nanobody (VHH) to construct CAR T cells against prostate specific membrane antigen (PSMA). The nanobody against PSMA (NBP) was used to show the feasibility of CAR T cells against prostate cancer cells. T cells were transfected, and then the surface expression of the CAR T cells was confirmed. Then, the functions of VHH-CAR T cell were evaluated upon coculture with prostate cancer cells. At the end, the cytotoxicity potential of NBPII-CAR in T cells was approximated by determining the cell surface expression of CD107a after encountering PSMA. Our data show the specificity of VHH-CAR T cells against PSMA+ cells (LNCaP), not only by increasing the interleukin 2 (IL-2) cytokine (about 400 pg/mL), but also the expression of CD69 by almost 38%. In addition, VHH-CAR T cells were proliferated by nearly 60% when cocultured with LNCaP, as compared with PSMA negative prostate cancer cell (DU-145), which led to the upregulation of CD107a in T cells upto 31%. These results clearly show the possibility of using VHH-based CAR T cells for targeted immunotherapy, which may be developed to target virtually any tumor-associated antigen for adoptive T-cell immunotherapy of solid tumors.

T cell engineered with a novel nanobody-based chimeric antigen receptor against VEGFR2 as a candidate for tumor immunotherapy.

Solid tumors that are responsible for more than 85% of cancer death cases need angiogenesis for their growth and metastasis. Among antiangiogenic therapies, targeting the vascular endothelial growth factor receptor 2 (VEGFR2) that is over-expressed on tumor vasculatures has been a promising strategy. In this study, we developed a second generation nanobody (VHH)-based CAR T cell targeting VEGFR2-expressing tumor cells. The CAR T cell was developed by linking the anti-VEGFR2 VHH to a spacer, and signaling domains of CD28 and CD3 ζ. The T cells were activated with anti-CD3 plus rIL-2 and electroporated with a plasmid encoding the CAR construct. The expression of activation markers, CD69 and CD25, on CAR T cells upon coculturing with VEGFR2-expressing cells were 41% and 48%, and the IL-2 and IFN-γ production were 470 pg/mL and 360 pg/mL, respectively. The expression of degranulation marker, CD107a, was 30% and the cytotoxic activity of the CAR T cells reached to more than 30% with E:T ratio of 9:1. The anti-VEGFR2 CAR but not mock T cells mediated specific lysis of 293-KDR cells expressing human VEGFR2 and might be considered as a candidate for adoptive T-cell immunotherapy of solid tumors. © 2019 IUBMB Life, 71(9):1259-1267, 2019.

PTEN and miR-26b: Promising prognostic biomarkers in initiation and progression of Oral Squamous Cell Carcinoma.

BACKGROUNDS: Oral Squamous Cell Carcinoma (OSCC) is the most common malignancy of the oral cavity. Phosphatase and TENsin homolog (PTEN) is a well-known tumor suppressive gene regulated by several biomarkers including a small single-stranded molecule, microRNA26b (miR-26b). Here, we studied the expression of PTEN and miR-26b in OSCC specimens in comparison with adjacent normal mucosa. METHODS: The expressions of PTEN and miR-26b genes were evaluated at mRNA level in OSCC and adjacent normal fresh frozen tissues in 49 patients using Quantitative Real-Time PCR and analyzed their associations with clinicopathological factors. RESULTS: The expression level of PTEN was significantly lower in OSCC specimens comparing with adjacent normal tissues (P-value = 0.000). The expression of PTEN was associated with T stage (P-value = 0.006) and N stage (P-value = 0.043). A nonsignificant decrease in miR-26b expression level was also observed in OSCC tissues. Additionally, in patients with more aggressive tumoral behavior, including vascular invasion (P-value = 0.012) and positive N stage (P-value = 0.02), significant decreases were found. CONCLUSIONS: These findings suggest that inactivation of PTEN may have an impact on initiation and progression of OSCC. Additionally, miR-26b might have a tumor suppressive role in OSCC.

Co-existence of GM, conventional and organic crops in developing countries: Main debates and concerns.

The co-existence approach of GM crops with conventional agriculture and organic farming as a feasible agricultural farming system has recently been placed in the center of hot debates at the EU-level and become a source of anxiety in developing countries. The main promises of this approach is to ensure "food security" and "food safety" on the one hand, and to avoid the adventitious presence of GM crops in conventional and organic farming on the other, as well as to present concerns in many debates on implementing the approach in developing countries. Here, we discuss the main debates on ("what," "why," "who," "where," "which," and "how") applying this approach in developing countries and review the main considerations and tradeoffs in this regard. The paper concludes that a peaceful co-existence between GM, conventional, and organic farming is not easy but is still possible. The goal should be to implement rules that are well-established proportionately, efficiently and cost-effectively, using crop-case, farming system-based and should be biodiversity-focused ending up with "codes of good agricultural practice" for co-existence.

Pronuclear pattern does not predict morphokinetics behavior in human embryos.

The purpose was to investigate the correlation between pronuclei (PN) morphology and morphokinetic behaviors of derived embryos with time lapse monitoring (TLM) in assisted reproduction setting. Over time, PN morphology from PN appearance (PNA) to PN fading (PNF), PNF according to size, contact, number and position of nuclear precursor bodies (NPBs) within each PN and morphokinetics variables, including absolute time points, relative timing parameters, cleavage patterns and arrest rate, were evaluated using TLM. There were insignificant relationship between morphokinetics variables including tBP2, tPNA, tPNF, t2, t3, t4, t5, t6, t7, t8, S1, CC2, S2 and Z scoring according Z1 to Z4 (p > .05). Also, an insignificant relationship was noticed between uneven blastomeres, reverse cleavage embryos and Z scoring (p > .05). However, there were significant correlations between the rates of direct and arbitrary cleavage as well as arrested embryos and Z scores. Combined PN morphology and embryo kinetic evaluation were suggested in assisted reproduction programs.

Expression Analysis of OIP5-AS1 in Non-Small Cell Lung Cancer.

BACKGROUND: Lung cancer as the most fatal cancer of men has prompted researchers to find biomarkers for early detection and prognosis. Among the possible biomarkers are a group of non-coding transcripts with sizes more than 200 nucleotides called long non-coding RNAs (lncRNAs). AIMS: In the present study, we evaluated the expression levels of the lncRNA OIP5 antisense RNA 1 (OIP5-AS1) in 32 non-small cell lung cancer (NSCLC) samples compared with their corresponding adjacent non-cancerous tissue (ANCTs) by means of real-time polymerase chain reaction. The samples were obtained from patients who were admitted at Labbafi-Nejad Hospital during 2015 and 2016. RESULTS: OIP5-AS expression levels was significantly decreased in tumoral tissues compared with ANCTs in total samples and in male subgroup. However, no association was found between relative expression of OIP5-AS1 and clinicopathological data of patients or history of smoking. Expression levels of this lncRNA were not correlated with patients age. CONCLUSIONS: This lncRNA is possibly a novel biomarker of NSCLC in Iranian patients. Future studies are needed to confirm the results of our study in larger sample sizes. Moreover, based on the difference in lung cancer associated risk factors in different populations, population-based studies are needed to explore the role of this lncRNA in the pathogenesis of cancers in each region to design appropriate targeted therapies for each population. Key words: lung cancer - OIP5-AS - lncRNA - long non-coding RNA.

Lipid Profiles and Prevalence of Dyslipidemia in Eastern Iranian Adolescents, Birjand, 2012.

BACKGROUND: Cardiovascular risk factors begin in childhood and adolescence. This study aimed at assessing serum lipids and prevalence of Dyslipidemia in 11-18 year old students of Birjand. METHODS: The present cross-sectional, descriptive, and analytical study was done on 2,643 middle and high school students of Birjand aged 11-18 years (1,396 girls and 1,247 boys). Blood samples were collected for the measurement of blood lipids, including Cholesterol, Triglyceride, HDL, and LDL after a 12-hour fasting period. The defined borderline and abnormal values stated in 2011 by the American Academy of Child, was used. RESULTS: According to our results, it is concluded that: (i) 34.3% (31.3% girls and 37.6% boys) of adolescents had at least one dyslipidemia. (ii) 24.7% of the individuals had HDL lower than 40, where 14% of them TG≥130, 6.1% of cases TC≥200, and 3.5% of cases LDL≥130. Lipid disorder within low HDL type and hypertriglyceridemia were significantly higher in boys (P<0.05) than girls. Hypercholesterolemia and hypertriglyceridemia in the age group of 11-14 years and low HDL in the age group of 15-18 years showed the highest values (P<0.05). CONCLUSION: Adolescents of Birjand have high prevalence of dyslipidemia. Preventive measures are recommended to improve lifestyle, including healthy nutrition, encouraging adolescents to exercise, and more mobility.

Developmental competence of ovine oocyte following vitrification: effect of oocyte developmental stage, cumulus cells, cytoskeleton stabiliser, FBS concentration, and equilibration time.

The aim of the present study was to examine the effects of fetal bovine serum (FBS) concentration, equilibration time, and oocyte pre-treatment with cytochalasin B (CCB) on subsequent development of vitrified-warmed ovine immature (GVCOCs) and matured (MII) oocytes with (MIICOCs) or without cumulus cells (MIIDOs). In Experiment 1, the effects of FBS concentrations (10 and 20%) during the vitrification-warming procedure were examined. Survival rates after warming were not different between GVCOCs, MIICOCs and MIIDOs oocytes. After in vitro fertilization, rate of cleaved embryos in MIICOCs group at the presence of 20%FBS was higher than MIIDOs and GVCOCs groups. In Experiment 2, the effects of equilibration times (5, 7, and 10 min) were examined. There was no difference in survival rate of vitrified-warmed oocytes equilibrated at different times. Although, the rate of cleavage in MIICOCs and MIIDOs oocytes equilibrated for 10 and 7 min, respectively, was higher than 5 min equilibrated MIIDOs and 7 and 10 min equilibrated GVCOCs oocytes. In Experiment 3, the effects of oocyte pre-treatment with CCB were examined. Despite the insignificant difference in survival rate of vitrified-warmed ovine immature and matured oocytes, the rates of cleavage in CCB pretreated groups were significantly lower than untreated groups. Moreover, the blastocysts were only derived from those cumulus enclosed vitrified-warmed germinal vesicle (GV) and MII oocytes that had been exposed to 10% FBS in the absence of CCB. In conclusion, the presence of cumulus cells, 10% FBS, and the omission of CCB were beneficial for post-warming development of vitrified ovine oocytes.

Single-Cell RNA Sequencing in Organ and Cell Transplantation.

Single-cell RNA sequencing is a high-throughput novel method that provides transcriptional profiling of individual cells within biological samples. This method typically uses microfluidics systems to uncover the complex intercellular communication networks and biological pathways buried within highly heterogeneous cell populations in tissues. One important application of this technology sits in the fields of organ and stem cell transplantation, where complications such as graft rejection and other post-transplantation life-threatening issues may occur. In this review, we first focus on research in which single-cell RNA sequencing is used to study the transcriptional profile of transplanted tissues. This technology enables the analysis of the donor and recipient cells and identifies cell types and states associated with transplant complications and pathologies. We also review the use of single-cell RNA sequencing in stem cell implantation. This method enables studying the heterogeneity of normal and pathological stem cells and the heterogeneity in cell populations. With their remarkably rapid pace, the single-cell RNA sequencing methodologies will potentially result in breakthroughs in clinical transplantation in the coming years.

The Relationship between the Clinical Course of SARS-CoV-2 Infections and Expression of Bruton's Tyrosine Kinase.

OBJECTIVES: The Bruton tyrosine kinase (BTK), an important element for the production of several inflammatory cytokines, may play a role in the pathogenesis of COVID-19. The aim of this study was to investigate the level of BTK gene expression in COVID-19 cases based on the severity and the outcome of the disease. METHODS: In this study, 33 hospitalized patients with COVID-19 were recruited and were divided into two groups based on the severity of the disease: "mild to moderate" and "severe to critical". A blood sample was taken from each patient, peripheral blood mononuclear cells (PBMCs) were extracted, and BTK gene expression was measured. The level of BTK gene expression was compared based on the demographic data, laboratory results, and the severity and outcome of the disease. RESULTS: Among 33 patients, 22 (66.7%) were male. Nearly half of the cases had at least one underlying disease. According to the severity of the disease, 12 patients were in the "mild to moderate" group, and 21 were in the "severe to critical" group; eight (24.2%) eventually died. Age, weight, and BMI had no significant relationship with BTK expression. BTK expression was significantly lower in "severe to critical" and ICU-admitted cases and in subjects with low O2 saturation. There was no significant difference in BTK expression between cured and dead patients (p=0.117). CONCLUSION: BTK gene expression in PBMCs had an inverse relationship with the severity of the disease of COVID-19. However, no correlation between BTK expression and disease outcome was observed.

Effect of motivational interviewing on treatment adherence and self-efficacy of adolescents with asthma: A randomized controlled trial.

AIMS: This study examined the short-term effect of motivational interviewing on treatment adherence and self-efficacy of adolescents with asthma. DESIGN: The randomized controlled trial. METHOD: In this study, 72 adolescents with asthma were recruited and assigned to experimental and control groups randomly. In the experimental group, the motivational interviewing was performed for five weekly sessions lasting 80-90 min. The treatment adherence and self-efficacy questionnaires were completed before the intervention, 2 weeks and 3 months after the intervention in both groups. Data were analysed by Chi-Square test, independent samples T-test, repeated measures of Wilcoxon and generalized estimating equation. RESULTS: The treatment adherence was found to be significantly higher 2 weeks (p = 0.006) and 3 months after the intervention (p = 0.04) in the experimental group than the control group. In addition, the degree of self-efficacy was significantly more in the experimental group 2 weeks (p < 0.001) and 3 months later (p < 0.001) than the control group. The result of generalized estimating equation showed that the intervention group had an average of 14.44 more self-efficacy points than the control group (p < 0.001). Also, treatment adherence in the intervention group was significantly higher than the control group (ß = 6.14, p = 0.05(. CONCLUSION: This study adds to the evidence for the effectiveness of motivational interviewing in treatment of adolescents with asthma.