Displaying publications 101 - 120 of 124 in total

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  1. Gomathysankar S, Halim AS, Yaacob NS, Noor NM, Mohamed M
    J Stem Cells Regen Med, 2016;12(2):79-86.
    PMID: 28096632
    Adipose-derived stem cells (ASCs) have potential applications in the repair and regeneration of various tissues and organs. The use of various scaffold materials as an excellent template for mimicking the extracellular matrix to induce the attachment and proliferation of different cell types has always been of interest in the field of tissue engineering because ideal biomaterials are in great demand. Chitosan, a marine polysaccharide, have wide clinical applications and it acts as a promising scaffold for cell migration and proliferation. ASCs, with their multi-differentiation potential, and chitosan, with its great biocompatibility with ASCs, were investigated in the present study. ASCs were isolated and were characterized by two different methods: immunocytochemistry and flow cytometry, using the mesenchymal stem cell markers CD90, CD105, CD73 and CD29. The ASCs were then induced to differentiate into adipogenic, osteogenic and chondrogenic lineages. These ASCs were incorporated into a porous chitosan scaffold (PCS), and their structural morphology was studied using a scanning electron microscope and hematoxylin and eosin staining. The proliferation rate of the ASCs on the PCS was assessed using a PrestoBlue viability assay. The results indicated that the PCS provides an excellent template for the adhesion and proliferation of ASCs. Thus, this study revealed that PCS is a promising biomaterial for inducing the proliferation of ASCs, which could lead to successful tissue reconstruction in the field of tissue engineering.
  2. Poh Yuen Wen A, Halim AS, Mat Saad AZ, Mohd Nor F, Wan Sulaiman WA
    Complement Ther Med, 2018 Dec;41:261-266.
    PMID: 30477850 DOI: 10.1016/j.ctim.2018.10.006
    BACKGROUND: Gamat (sea-cucumber) is a natural occurring fauna which is popularly used as traditional medication in Southeast Asian countries. There have been many animal studies done on its' biochemical properties and its' effects in vivo. The effect of gamat on human cutaneous wounds was studied using a split-skin graft donor site wound.

    METHODS: This was a comparative case-control study done on patients in Hospital Universiti Sains Malaysia (Hospital USM), requiring split-thickness skin grafting, whereby, the skin graft donor site was divided to almost equal halves, and applied with both gamat-based gel on one side, with Duoderm® hydrogel on the other side. The epithelialization of the wounds was observed and compared on days 10, 14 and 21. Pain score, and pruritus score were also observed. Repeated measure analysis of variance (ANOVA) test and Paired t-test was used to test statistical significance accordingly.

    RESULTS: No significant differences were seen in rates of epithelialization of wounds on days 10, 14 and 21 (p > 0.01). No significant difference was also seen in the pain score and pruritus score (p > 0.01).

    CONCLUSIONS: A gamat-based gel is comparable to conventional hydrogels in treatment of split-skin graft donor site. No adverse effects were observed in either group.

  3. Mat Saad AZ, Chai KS, Wan Sulaiman WA, Mat Johar SFN, Halim AS
    Arch Plast Surg, 2019 Nov;46(6):518-524.
    PMID: 31775204 DOI: 10.5999/aps.2019.00227
    BACKGROUND: Anterior palatal repair performed during cleft lip repair using a vomerine flap may assist in recruiting additional soft tissue for subsequent completion of palatoplasty, especially in patients with a wide cleft. We present our early.

    RESULTS: in the hope of triggering a re-evaluation of this technique regarding its advantages for maxillary growth through further studies of patients with a wide cleft.

    METHODS: A retrospective analysis of patients with complete unilateral and bilateral cleft lip and palate was performed, including cleft and palatal measurements taken during initial surgery (lip repair together with anterior palate repair) and upon completion of palatoplasty.

    RESULTS: In total, 14 patients were included in this study, of whom nine (63.3%) had unilateral cleft lip and palate and five (37.5%) had bilateral cleft. All patients had a wide cleft palate. Lip and anterior palate repair was done at a median age of 3 months, while completion of palatoplasty was done at a median age of 10.5 months. Measurements taken upon completion of palatoplasty showed significant cleft width reduction in the mid-palate and intertubercle regions; however, the palatal arch distances at nearby landmarks showed non-significant marginal changes.

    CONCLUSIONS: Anterior palate repair using a vomerine flap significantly reduced the remaining cleft width, while the palatal width remained. Further research is warranted to explore the long-term effects of this technique in wide cleft patients in terms of facial growth.

  4. Ho HL, Halim AS, Mat Saadk AZ, Sulaiman WAW, Ilias MI
    Med J Malaysia, 2021 Sep;76(5):737-740.
    PMID: 34508385
    Renal transplant is the first-line therapy in paediatric patients with end-stage renal disease (ESRD). Wong HS and Goh BL reported up to 79% of 1061 paediatric patients still require long-term haemodialysis (HD).1 The lack of deceased and living donors is attributable to the poor awareness, cultural and religious grounds. Permanent vascular access (PVA) in paediatrics therefore, serves more as a long term treatment rather than a bridging therapy. We observed 5 children and an adolescent, all with previous indwelling catheters, who underwent arteriovenous fistula (AVF) creation and report the outcomes. The aim of this report is to determine the factors that influence the longterm patency of paediatric AVF. Factors such as body weight, vessel diameter, preoperative preparations, microsurgical technique and postoperative maintenance are discussed. In addition, considerations on the choice and timing of PVA is highlighted.
  5. Airuddin SS, Halim AS, Wan Sulaiman WA, Kadir R, Nasir NAM
    Biomedicines, 2021 Nov 05;9(11).
    PMID: 34829853 DOI: 10.3390/biomedicines9111624
    Stem cells have been widely used for treating disease due to the various benefits they offer in the curing process. Several treatments using stem cells have undergone clinical trials, such as cell-based therapies for heart disease, sickle cell disease, thalassemia, etc. Adipose-derived stem cells are some of the many mesenchymal stem cells that exist in our body that can be harvested from the abdomen, thighs, etc. Adipose tissue is easy to harvest, and its stem cells can be obtained in higher volumes compared to stem cells harvested from bone marrow, for which a more invasive technique is required with a smaller volume obtained. Many scientists have expressed interest in investigating the role of adipose-derived stem cells in treating disease since their use was first described. This is due to these stem cells' ability to differentiate into multiple lineages and secrete a variety of growth factors and proteins. Previous studies have found that the hormones, cytokines, and growth factors contained in adipose tissue play major roles in the metabolic regulation of adipose tissue, as well as in energy balance and whole-body homeostasis through their endocrine, autocrine, and paracrine functions. These are thought to be important contributors to the process of tissue repair and regeneration. However, it remains unclear how effective and safe ADSCs are in treating diseases. The research that has been carried out to date is in order to investigate the impact of ADSCs in disease treatment, as described in this review, to highlight its "trick or treat" effect in medical treatment.
  6. Hussin I, Halim AS, Ibrahim MI, Markos ZO, Effendie ESAB
    Cleft Palate Craniofac J, 2022 02;59(2):209-215.
    PMID: 33813904 DOI: 10.1177/10556656211003797
    OBJECTIVE: To identify the cultural beliefs about the causes of cleft among parents of patients with nonsyndromic cleft lip and/or palate in a multiethnic society in Malaysia and the difficulties encountered in receiving cleft treatment.

    DESIGN: A descriptive cross-sectional multicenter study based on a study questionnaire was conducted of parents of patients with cleft lip and/or palate.

    SETTING: Three centers providing cleft care from different regions in Malaysia: the national capital of Kuala Lumpur, east coast of peninsular Malaysia, and East Malaysia on the island of Borneo.

    PARTICIPANTS: Parents/primary caregivers of patients with cleft lip and/or palate.

    RESULTS: There were 295 respondents from different ethnic groups: Malays (58.3%), indigenous Sabah (30.5%), Chinese (7.1%), Indian (2.4%), and indigenous Peninsular Malaysia and Sarawak (1.7%). Malay participants reported that attributing causes of cleft to God's will, superstitious beliefs that the child's father went fishing when the mother was pregnant or inheritance. Sabahans parents reported that clefts are caused by maternal antenatal trauma, fruit picking, or carpentry. The Chinese attribute clefts to cleaning house drains, sewing, or using scissors. Cultural background was reported by 98.3% of participants to pose no barrier in cleft treatment. Those from lower socioeconomic and educational backgrounds were more likely to encounter difficulties while receiving treatment, which included financial constraints and transportation barriers.

    CONCLUSION: There is a wide range of cultural beliefs in the multiethnic society of Malaysia. These beliefs do not prevent treatment for children with cleft. However, they face challenges while receiving cleft treatment, particularly financial constraints and transportation barriers. Such barriers are more likely experienced by parents from lower income and lower education backgrounds.

  7. Faisham WI, Zulmi W, Halim AS, Biswal BM, Mutum SS, Ezane AM
    Singapore Med J, 2006 Aug;47(8):679-83.
    PMID: 16865207
    The surgical treatment of Stage III or aggressive giant cell tumour of the bone, whether to perform intralesional or en-bloc resection, remains controversial. The aim of this study is to identify the effectiveness of en-bloc resection for local control and final oncological outcome of the disease.
  8. Mohd Said MT, Halim AS, Mat Zain MA, Koh KL
    Cureus, 2023 May;15(5):e39312.
    PMID: 37346202 DOI: 10.7759/cureus.39312
    Webbed neck deformity is a congenital anomaly that exists in several syndromes. Various techniques for surgically correcting the webbed neck deformity have been described in the literature, each comes with its own advantages and disadvantages. The aim of surgery is to achieve normal neck contour and symmetrical hairline, avoid excessive scarring over the anterior and lateral neck, and limit recurrence. In this report, we described our experience in managing a case of Turner syndrome with bilateral webbed neck deformity using the modified five-flap Z-plasty technique.
  9. Rosli MA, Mohd Nasir NA, Mustafa MZ, Othman MA, Zakaria Z, Halim AS
    J Taibah Univ Med Sci, 2024 Feb;19(1):209-219.
    PMID: 38124990 DOI: 10.1016/j.jtumed.2023.11.003
    PURPOSE: Kelulut honey contains trehalulose and has high antioxidant content, such as phenolic and flavonoid substances, which can promote wound healing. This study evaluated the effectiveness of Kelulut honey in diabetic wound healing compared to a commercially available conventional gel dressing (Intrasite gel).

    METHODS: A prospective, randomized, single-blinded control trial was performed on eligible diabetic patients with full-thickness cavity wounds. Patients' demographics, size and site of wounds, and baseline routine blood investigations were recorded. The wounds were dressed every other day with Kelulut honey for the intervention group or gel for the control group. The wound size reduction and granulation tissue formation percentage were calculated every 6 days for 1 month.

    RESULTS: Seventy-one patients were randomized. After 30 days of follow-up, 62 participants were available for analysis: 30 from the control group and 32 from the treatment group. The control group had increased granulation tissue at baseline and more wounds on the lower limb and posterior trunk. Both groups showed an increasing mean and median percentage of wound epithelialization and granulation tissue over time, with significantly higher values at every timepoint in the honey group (p 

  10. Mohamad Shah NS, Salahshourifar I, Sulong S, Wan Sulaiman WA, Halim AS
    BMC Genet, 2016 Feb 11;17:39.
    PMID: 26868259 DOI: 10.1186/s12863-016-0345-x
    BACKGROUND: Nonsyndromic orofacial clefts are one of the most common birth defects worldwide. It occurs as a result of genetic or environmental factors. This study investigates the genetic contribution to nonsyndromic cleft lip and/or palate through the analysis of family pedigrees. Candidate genes associated with the condition were identified from large extended families from the Malay population.

    RESULTS: A significant nonparametric linkage (NPL) score was detected in family 100. Other suggestive NPL and logarithm of the odds (LOD) scores were attained from families 50, 58, 99 and 100 under autosomal recessive mode. Heterogeneity LOD (HLOD) score ≥ 1 was determined for all families, confirming genetic heterogeneity of the population and indicating that a proportion of families might be linked to each other. Several candidate genes in linkage intervals were determined; LPHN2 at 1p31, SATB2 at 2q33.1-q35, PVRL3 at 3q13.3, COL21A1 at 6p12.1, FOXP2 at 7q22.3-q33, FOXG1 and HECTD1 at 14q12 and TOX3 at 16q12.1.

    CONCLUSIONS: We have identified several novel and known candidate genes for nonsyndromic cleft lip and/or palate through genome-wide linkage analysis. Further analysis of the involvement of these genes in the condition will shed light on the disease mechanism. Comprehensive genetic testing of the candidate genes is warranted.

  11. Periayah MH, Halim AS, Yaacob NS, Saad AZ, Hussein AR, Rashid AH, et al.
    Biomed Res Int, 2014;2014:653149.
    PMID: 25247182 DOI: 10.1155/2014/653149
    Platelet membrane receptor glycoprotein IIb/IIIa (gpiibiiia) is a receptor detected on platelets. Adenosine diphosphate (ADP) activates gpiibiiia and P2Y12, causing platelet aggregation and thrombus stabilization during blood loss. Chitosan biomaterials were found to promote surface induced hemostasis and were capable of activating blood coagulation cascades by enhancing platelet aggregation. Our current findings show that the activation of the gpiibiiia complex and the major ADP receptor P2Y12 is required for platelet aggregation to reach hemostasis following the adherence of various concentrations of chitosan biomaterials [7% N,O-carboxymethylchitosan (NO-CMC) with 0.45 mL collagen, 8% NO-CMC, oligochitosan (O-C), and oligochitosan 53 (O-C 53)]. We studied gpiibiiia and P2Y12 through flow cytometric analysis and western blotting techniques. The highest expression of gpiibiiia was observed with Lyostypt (74.3 ± 7.82%), followed by O-C (65.5 ± 7.17%). Lyostypt and O-C resulted in gpiibiiia expression increases of 29.2% and 13.9%, respectively, compared with blood alone. Western blot analysis revealed that only O-C 53 upregulated the expression of P2Y12 (1.12 ± 0.03-fold) compared with blood alone. Our findings suggest that the regulation of gpiibiiia and P2Y12 levels could be clinically useful to activate platelets to reach hemostasis. Further, we show that the novel oligochitosan is able to induce the increased expression of gpiibiiia and P2Y12, thus accelerating platelet aggregation in vitro.
  12. Farea M, Halim AS, Abdullah NA, Lim CK, Mokhtar KI, Berahim Z, et al.
    Int J Mol Sci, 2013;14(6):11157-70.
    PMID: 23712356 DOI: 10.3390/ijms140611157
    Hertwig's epithelial root sheath (HERS) cells play a pivotal role during root formation of the tooth and are able to form cementum-like tissue. The aim of the present study was to establish a HERS cell line for molecular and biochemical studies using a selective digestion method. Selective digestion was performed by the application of trypsin-EDTA for 2 min, which led to the detachment of fibroblast-like-cells, with the rounded cells attached to the culture plate. The HERS cells displayed a typical cuboidal/squamous-shaped appearance. Characterization of the HERS cells using immunofluorescence staining and flow cytometry analysis showed that these cells expressed pan-cytokeratin, E-cadherin, and p63 as epithelial markers. Moreover, RT-PCR confirmed that these cells expressed epithelial-related genes, such as cytokeratin 14, E-cadherin, and ΔNp63. Additionally, HERS cells showed low expression of CD44 and CD105 with absence of CD34 and amelogenin expressions. In conclusion, HERS cells have been successfully isolated using a selective digestion method, thus enabling future studies on the roles of these cells in the formation of cementum-like tissue in vitro.
  13. Periayah MH, Halim AS, Mat Saad AZ, Yaacob NS, Hussein AR, Abdul Karim F, et al.
    Thromb Res, 2015 Sep;136(3):625-33.
    PMID: 26254703 DOI: 10.1016/j.thromres.2015.07.027
    Von Willebrand disease (vWD) is the second least common hemostatic disorder in Malaysia, and it has a low prevalence. This study examined the underlying platelet thrombogenicity cascades in the presence of different formulations of chitosan-derivatives in vWD patients. This paper aimed to determine the significant influence of chitosan biomaterial in stimulating the platelet thrombogenicity cascades that involve the von Willebrand factor, Factor 8, Thromboxane A2, P2Y12 and Glycoprotein IIb/IIIa in vWD.
  14. Hanifi N, Halim AS, Aleas CF, Singh J, Marzuki M, Win TT, et al.
    Exp Clin Transplant, 2015 Jun;13(3):273-8.
    PMID: 26086837
    Skin grafting has been evolving as an important application in reconstructive surgery. Mixed reports about the survival of allogeneic and xenogeneic keratinocytes require further substantiation to determine the role of these cells in wound healing.
  15. Amran M, Sidek DS, Hamzah M, Abdullah JM, Halim AS, Johari MR, et al.
    J Otolaryngol, 2002 Jun;31(3):165-9.
    PMID: 12121021
  16. Rajion ZA, Townsend GC, Netherway DJ, Anderson PJ, Yusof A, Hughes T, et al.
    Cleft Palate Craniofac J, 2006 Sep;43(5):513-8.
    PMID: 16986980
    To investigate anatomical variations and abnormalities of cervical spine morphology in unoperated infants with cleft lip and palate.
  17. Rosli MA, Sulaiman WAW, Ismail WFW, Yahaya S, Saad AZM, Wan Z, et al.
    PMID: 34756555 DOI: 10.1016/j.bjps.2021.09.032
    BACKGROUND: With the advent of new techniques, foot salvage is feasible following talus oncological resection. As the reconstruction aims to achieve a pain-free, stable ankle for ambulation, biological limb reconstruction is the best option. This case series will evaluate the primary indications, complications, and functional outcomes of the reconstructed talus and highlighting the technical aspects of the surgery with a novel technique of triangular double-barrel free fibula flap.

    METHODS: We performed a retrospective case note review of patients undergoing foot salvage surgeries and primary talus reconstruction with double-barrel free fibula flaps between 2009 and 2019. Patient demographics, aetiologies, operative details, complications, and outcomes were analysed. All patients underwent the same talar reconstruction technique whereby a wide-based triangular framework was created from two bony struts of the osteotomized fibula. The Musculoskeletal Tumour Society (MSTS) scoring system was used to analyse the short- to mid-term functional outcomes.

    RESULTS: Four consecutive patients with aggressive benign and malignant tumours were identified. They consist of three males and one female, with a median age of 32 (range 27-39). Patients were followed up for a median duration of 60 months (range 24-132). Two flaps were complicated with venous thromboses; however, all were salvageable following re-explorations. All patients achieved solid bony fusion with good functional and aesthetic outcomes. The median MSTS score was 74.5% (range 66-76). No donor site morbidity and local recurrence were reported.

    CONCLUSION: The triangular double-barrel free fibular flap is a good option for limb salvage following total talus resection, with good short- to mid-term functional and aesthetic outcomes.

  18. Periayah MH, Halim AS, Saad AZ, Yaacob NS, Hussein AR, Karim FA, et al.
    Int J Clin Exp Med, 2015;8(9):15611-20.
    PMID: 26629055
    Chitosan-derived biomaterials have been reported to adhere when in contact with blood by encouraging platelets to adhere, activate and aggregate at the sites of vascular injury, thus enhanced wound healing capacity. This study investigated platelet morphology changes and the expression level of transforming growth factor-β1 (TGF-β1) and platelet-derived growth factor-AB (PDGF-AB) in the adherence of two different types of chitosans in von Willebrand disease (vWD): N,O-carboxymethylchitosan (NO-CMC) and oligo-chitosan (O-C). Fourteen vWD voluntary subjects were recruited, and they provided written informed consent. Scanning electron microscopy and enzyme-linked immunosorbent assay test procedures were employed to achieve the objective of the study. The results suggest that the O-C group showed dramatic changes in the platelet's behaviors. Platelets extended filopodia and generated lamellipodia, leading to the formation of grape-like shaped aggregation. The platelet aggregation occurred depending on the severity of vWD. O-C was bound to platelets on approximately 90% of the surface membrane in vWD type 1; there was 70% and 50% coverage in vWD type II and III, respectively. The O-C chitosan group showed an elevated expression level of TGF-β1 and PDGF-AB. This finding suggests that O-C stimulates these mediators from the activated platelets to the early stage of restoring the damaged cells and tissues. This study demonstrated that the greater expression level of O-C assists in mediating the cytokine complex networks of TGF-β1 and PDGF-AB and induces platelet activities towards wound healing in vWD. With a better understanding of chitosan's mechanisms of action, researchers are able to accurately develop novel therapies to prevent hemorrhage.
  19. Othman Z, Abdul Halim AS, Azman KF, Ahmad AH, Zakaria R, Sirajudeen KNS, et al.
    Front Aging Neurosci, 2022;14:876159.
    PMID: 35572132 DOI: 10.3389/fnagi.2022.876159
    OBJECTIVES: This study aimed to profile the cognitive aging research landscape from 1956 to 2021.

    METHODS: A total of 3,779 documents were retrieved from the Scopus database for the bibliometric analysis and network visualization. By comparing each keyword's overall connection strength (centrality), frequency (density), and average year of publication (novelty) to the calculated median values acquired from the overlay view of the VOSviewer map, the enhanced strategic diagrams (ESDs) were constructed.

    RESULTS: The findings showed an increasing trend in the number of publications. The United States leads the contributing countries in cognitive aging research. The scientific productivity pattern obeyed Lotka's law. The most productive researcher was Deary, I. J., with the highest number of publications. The collaborative index showed an increasing trend from 1980 onwards. Frontiers in Aging Neuroscience is the most prestigious journal in the field of cognitive aging research. In Bradford core journals zone 1, the top 10 core journals of cognitive aging research provided more than half of the total articles (697, or 55.36 percent).

    CONCLUSIONS: For the next decades, the trending topics in cognitive aging research include neuropsychological assessment, functional connectivity, human immunodeficiency virus (HIV), decision-making, gender, compensation, default mode network, learning and memory, brain-derived neurotrophic factor (BDNF), obesity, D-galactose, epigenetics, frailty, mortality, mini-mental state examination (MMSE), anxiety, and gait speed.

  20. Rajion ZA, Townsend GC, Netherway DJ, Anderson PJ, Hughes T, Shuaib IL, et al.
    Cleft Palate Craniofac J, 2006 Sep;43(5):532-8.
    PMID: 16986987
    To compare morphological and positional variations of the hyoid bone in unoperated infants with cleft lip and palate (CL/P) with those in noncleft infants.
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