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Fulltext Effects of Low-Dose versus High-Dose γ-Tocotrienol on the Bone Cells Exposed to the Hydrogen Peroxide-Induced Oxidative Stress and Apoptosis

Abd Manan N, Mohamed N, Shuid AN

Evid Based Complement Alternat Med, 2012;2012:680834.
PMID: 22956976 DOI: 10.1155/2012/680834

Oxidative stress and apoptosis can disrupt the bone formation activity of osteoblasts which can lead to osteoporosis. This study was conducted to investigate the effects of γ-tocotrienol on lipid peroxidation, antioxidant enzymes activities, and apoptosis of osteoblast exposed to hydrogen peroxide (H(2)O(2)). Osteoblasts were treated with 1, 10, and 100 μM of γ-tocotrienol for 24 hours before being exposed to 490 μM (IC(50)) H(2)O(2) for 2 hours. Results showed that γ-tocotrienol prevented the malondialdehyde (MDA) elevation induced by H(2)O(2) in a dose-dependent manner. As for the antioxidant enzymes assays, all doses of γ-tocotrienol were able to prevent the reduction in SOD and CAT activities, but only the dose of 1 μM of GTT was able to prevent the reduction in GPx. As for the apoptosis assays, γ-tocotrienol was able to reduce apoptosis at the dose of 1 and 10 μM. However, the dose of 100 μM of γ-tocotrienol induced an even higher apoptosis than H(2)O(2). In conclusion, low doses of γ-tocotrienol offered protection for osteoblasts against H(2)O(2) toxicity, but itself caused toxicity at the high doses.
Fulltext Inhibitory and apoptosis-inducing effects of Newcastle disease virus strain AF2240 on mammary carcinoma cell line

Ahmad U, Ahmed I, Keong YY, Abd Manan N, Othman F

Biomed Res Int, 2015;2015:127828.
PMID: 25821783 DOI: 10.1155/2015/127828

Breast cancer is the malignant tumour that developed from cells of the breast and is the first leading cause of cancer death among women worldwide. Surgery, radiotherapy, and chemotherapy are the available treatments for breast cancer, but these were reported to have side effects. Newcastle disease virus (NDV) known as Avian paramyxovirus type-1 (APMV1) belongs to the genus Avulavirus in a family Paramyxoviridae. NDV is shown to be a promising anticancer agent, killing tumour cells while sparing normal cells unharmed. In this study, the oncolytic and cytotoxic activities of NDV AF2240 strain were evaluated on MDA-MB-231, human mammary carcinoma cell line, using MTT assay, and its inhibitory effects were further studied using proliferation and migration assays. Morphological and apoptotic-inducing effects of NDV on MD-MB-231 cells were observed using phase contrast and fluorescence microscopes. Detection of DNA fragmentation was done following terminal deoxyribonucleotide transferase-mediated Br-dUTP nick end labeling staining (TUNEL) assay, which confirmed that the mode of death was through apoptosis and was quantified by flow cytometry. Furthermore, analysis of cellular DNA content demonstrated that the virus caused an increase in the sub-G1 phase (apoptotic peak) of the cell cycle. It appears that NDV AF2240 strain is a potent anticancer agent that induced apoptosis in time-dependent manner.
Fulltext Sleep quality among pre-clinical medical students in Universiti Putra Malaysia and Universiti Malaya, Malaysia

Ngu ST, Masalamany K, Abd Manan N, Adam SK

Education in Medicine Journal, 2017;9(3):23-31.
MyJurnal DOI: 10.21315/eimj2017.9.3.3

Introduction: Poor sleep quality among university students has become an important issue to be concerned as it can hugely influence the students especially on their academic performance. However, there are inadequate studies published on the sleep quality of medical students in Malaysia.
Objective: This study aimed at determining the sleep quality of pre-clinical medical students in Universiti Putra Malaysia (UPM) and Universiti Malaya (UM). Methods: This is a cross-sectional study that used self-administered questionnaire to collect data from the pre-clinical medical students
of UPM and UM. Sleep quality of the students was measured using Pittsburgh Sleep Quality Index (PSQI) questionnaire. All data were analysed by SPSS version 21.
Results: Findings revealed that 63.9% respondents with poor sleep quality (PSQI score: more than 5). The prevalence of poor sleepers
in UM (67%) was slightly higher compared to UPM (60.9%). However, the comparison of PSQI score showed no significant difference between UPM and UM respondents (p = 0.082). Meanwhile, the average sleep duration per night among respondents was 5 hours 39 minutes (± 1.21 hrs), whereas
only 6.1% students practiced recommended sleep value per night (> 7 hrs). Significant association was found between caffeine intake and sleep quality. Besides, this present study showed no association between sleep quality with gender and year of study.
Conclusion: Majority of the pre-clinical students in UPM and UM had poor sleep quality and short sleep duration. Only a small number of students practiced recommended sleep value per night.
Postural effects on blood pressure, intraocular pressure, and ocular perfusion pressure in patients with spinal cord injury

Abd Manan N, Ismail ML, Engkasan JP, Zahari M

J Spinal Cord Med, 2024 May 02.
PMID: 38695735 DOI: 10.1080/10790268.2024.2345446

BACKGROUND: Reduced ocular perfusion pressure (OPP) from hypotension and consistent OPP variability due to blood pressure (BP) fluctuations are predisposing factors for glaucoma. Low resting BP and orthostatic hypotension (OH) in spinal cord injury (SCI) patients may increase the risk of glaucoma post-injury. This study investigated BP, intraocular pressure (IOP), and OPP changes between supine and sitting positions in SCI and normal individuals.
METHODS: Twenty SCI cases (high paraplegia, T1-T6 n = 6; low paraplegia, T7-L3 n = 14) and matched controls (1:1) were included. Systolic and diastolic BP (SBP and DBP) were measured digitally, and IOP with rebound tonometry. Measurements were taken one minute apart in both positions. Mean arterial pressure (MAP) was calculated, and OPP was determined using position-specific formulas.
RESULTS: No SCI subjects exhibited OH. Both groups experienced significant BP increment (P
Fulltext Sinonasal Lymphoma Presenting as Cavernous Sinus Syndrome: Case Report and Review of the Literature

Abd Manan N, Choo MM, Effendi Tenang I, Zahari M

Neuroophthalmology, 2022;46(3):194-198.
PMID: 35574170 DOI: 10.1080/01658107.2021.1996612

A 37-year-old man presented with a 1-week history of diplopia. He was under investigation by otorhinolaryngology for left sinonasal malignancy after imaging of the paranasal sinuses had revealed a large homogenous mass in the left nasal cavity. His visual acuity was 6/9 in each eye with no relative afferent pupillary defect. The left pupil, though was mid-dilated and unresponsive to light. He had a left-sided ptosis. Extraocular movements of the left eye were restricted in all directions of gaze and there was with limited abduction, dextroelevation and dextrodepression of the right eye. A trans-nasal biopsy revealed extranodal natural killer/T-cell lymphoma. Further imaging showed a large enhancing nasopharyngeal mass with intracranial extension to the cavernous sinuses and local infiltration together with intracranial abscesses. The patient was started on empirical intravenous antibiotics and supportive treatment. While awaiting institution of lymphoma chemotherapy, he died. The involvement of the cavernous sinus in sinonasal lymphoma represents an advanced stage. This case highlights that lymphoma should be considered in any patient presenting with a cavernous sinus syndrome and sinonasal disease.
Fulltext Ocular Jarisch-Herxheimer Reaction in the Treatment of Ocular Syphilis: A Case Report and Review of the Literature

Abd Manan N, Musa AA, Lott PW, Zahari M, Tajunisah I

Cureus, 2023 Jan;15(1):e33696.
PMID: 36788917 DOI: 10.7759/cureus.33696

Jarisch-Herxheimer reaction (JHR) is a transient clinical phenomenon in patients with syphilis who receive antibiotic treatment. A 31-year-old man with an underlying HIV infection presented with worsening vision in the right eye two days after being treated with oral doxycycline for presumed left-eye neuroretinitis. Prior history revealed two episodes of penile discharge and ulcers that were not investigated. Examination showed bilateral optic disc swelling with right eye placoid chorioretinitis around the macula. Optical coherence tomography (OCT) demonstrated right macular edema and left macular thinning. Blood investigations confirmed syphilis infection. Subsequently, the patient was scheduled for a contrasted brain CT with oral steroid coverage due to underlying allergies. His vision incidentally improved soon after the short course of steroids. Repeated OCT demonstrated marked improvement of right macular edema, which we believe was secondary to JHR initiated by the earlier doxycycline treatment. Following oral steroid addition, improvement in vision and ocular findings were seen. At six-month post-treatment, there was right macular atrophy as a sequela of the macular edema. Ophthalmologists should be aware of ocular-related JHR complications, particularly in potentiating macular atrophy following macular edema upon initiating antibiotic treatment in syphilitic disease.
The Standardized Extract of Centella asiatica and Its Fractions Exert Antioxidative and Anti-Neuroinflammatory Effects on Microglial Cells and Regulate the Nrf2/HO-1 Signaling Pathway

Hambali A, Jusril NA, Md Hashim NF, Abd Manan N, Adam SK, Mehat MZ, et al.

J Alzheimers Dis, 2024;99(s1):S119-S138.
PMID: 38250772 DOI: 10.3233/JAD-230875

BACKGROUND: Neuroinflammation and oxidative stress can aggravate the progression of Alzheimer's disease (AD). Centella asiatica has been traditionally consumed for memory and cognition. The triterpenes (asiaticoside, madecassoside, asiatic acid, madecassic acid) have been standardized in the ethanolic extract of Centella asiatica (SECA). The bioactivity of the triterpenes in different solvent polarities of SECA is still unknown.
OBJECTIVE: In this study, the antioxidative and anti-neuroinflammatory effects of SECA and its fractions were explored on lipopolysaccharides (LPS)-induced microglial cells.
METHODS: HPLC measured the four triterpenes in SECA and its fractions. SECA and its fractions were tested for cytotoxicity on microglial cells using MTT assay. NO, pro-inflammatory cytokines (TNF-α, IL-6, IL-1β), ROS, and MDA (lipid peroxidation) produced by LPS-induced microglial cells were measured by colorimetric assays and ELISA. Nrf2 and HO-1 protein expressions were measured using western blotting.
RESULTS: The SECA and its fractions were non-toxic to BV2 microglial cells at tested concentrations. The levels of NO, TNF-α, IL-6, ROS, and lipid peroxidation in LPS-induced BV2 microglial cells were significantly reduced (p