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  1. The cathepsin B inhibitor, z-FA-CMK is toxic and readily induced cell death in human T lymphocytes
    Liow KY, Chow SC
    Toxicol Appl Pharmacol, 2013 Nov 1;272(3):559-67.
    PMID: 23933532 DOI: 10.1016/j.taap.2013.07.022
    The cathepsin B inhibitor, benzyloxycarbonyl-phenylalanine-alanine-chloromethylketone (z-FA-CMK) was found to be toxic and readily induced cell death in the human T cell line, Jurkat, whereas two other analogs benzyloxycarbonyl-phenylalanine-alanine-fluoromethylketone (z-FA-FMK) and benzyloxycarbonyl-phenylalanine-alanine-diazomethylketone (z-FA-DMK) were not toxic. The toxicity of z-FA-CMK requires not only the CMK group, but also the presence of alanine in the P1 position and the benzyloxycarbonyl group at the N-terminal. Dose-response studies showed that lower concentrations of z-FA-CMK induced apoptosis in Jurkat T cells whereas higher concentrations induced necrosis. In z-FA-CMK-induced apoptosis, both initiator caspases (-8 and -9) and effector caspases (-3, -6 and -7) were processed to their respective subunits in Jurkat T cells. However, only the pro-form of the initiator caspases were reduced in z-FA-CMK-induced necrosis and no respective subunits were apparent. The caspase inihibitor benzyloxycarbonyl-valine-alanine-aspartic acid-(O-methyl)-fluoromehylketone (z-VAD-FMK) inhibits apoptosis and caspase processing in Jurkat T cells treated with low concentration of z-FA-CMK but has no effect on z-FA-CMK-induced necrosis and the loss of initiator caspases. This suggests that the loss of initiator caspases in Jurkat T cells during z-FA-CMK-induced necrosis is not a caspase-dependent process. Taken together, we have demonstrated that z-FA-CMK is toxic to Jurkat T cells and induces apoptosis at low concentrations, while at higher concentrations the cells die of necrosis.
  2. Fulltext Visual outcome in open globe injuries
    Thevi T, Mimiwati Z, Reddy SC
    Nepal J Ophthalmol, 2012;4(2):263-70.
    PMID: 22864032 DOI: http://dx.doi.org/10.3126/nepjoph.v4i2.6542
    To determine the factors affecting the visual outcome in patients with open globe injuries of eye.
  3. Fulltext Biosynthesis of novel polyhydroxyalkanoate containing 3-hydroxy-4-methylvalerate by Chromobacterium sp. USM2
    Ling SC, Tsuge T, Sudesh K
    J Appl Microbiol, 2011 Sep;111(3):559-71.
    PMID: 21689225 DOI: 10.1111/j.1365-2672.2011.05084.x
    Polyhydroxyalkanoate (PHA) with enhanced physicochemical properties will be ideal for a wide range of practical applications. The incorporation of 3-hydroxy-4-methylvalerate (3H4MV) into the polymer backbone is known to improve the overall properties of the resulting polymer. However, the most suitable micro-organism and PHA synthase that can synthesize this monomer efficiently still remain unknown at present. Therefore, we evaluated the abilities of a locally isolated Chromobacterium sp. USM2 to produce PHA containing 3H4MV.
  4. Fulltext End stage renal failure mimicking as acute renal failure in developing countries
    Lal C, Gupta A, Khaira A, Tiwari SC
    Med J Malaysia, 2009 Jun;64(2):184.
    PMID: 20058588
    Sir, We here are highlighting the scenario of presentation of renal dysfunction in developing countries like India where a large number of patients present clinically as acute renal failure (ARF) but on thorough evaluation found to have advanced stages of chronic kidney disease (CKD stages 4 and 5)1 . Historically these patients are symptomatic for few days prior to presenting. Preceding slight unwell-ness is ignored either by patient or his family physician. They are often being treated with non-specific medications like analgesics and multivitamins which act as placebo. Iron deficiency anemia is unevaluated for a renal cause. Non-standardized laboratories under diagnose early CKD. Ultrasound imaging too is of poor quality. All the more there are no nationalized health screening programmes. To add to the dismal scenario, at the tertiary care centres they are initially admitted as ARF, with a hope of significant recovery. But later on they turn out to be CKD 5.
  5. Fulltext Tubercular synovitis mimicking rheumatoid nodules
    Teo SC, George J, Kamarul T
    Med J Malaysia, 2008 Jun;63(2):159-61.
    PMID: 18942309 MyJurnal
    Tubercular tenosynovitis is an uncommon condition and usually affects the upper limb. We report a case of a patient with Systemic Lupus Erythematosus who presented with wrist swelling. The clinical findings were suggestive of rheumatoid nodules, but the radiographic finding of calcification associated with the nodules and marked erosive changes primarily of the radio-carpal joint with sparing of the metacarpal joints led the radiologist to believe that the nodules may not be rheumatoid nodules. The presence of solid and fluid nature of the nodule and hyperechoic small echogenic foci (matted rice bodies within thickened synovium) on ultrasound suggested the presence of chronic synovitis of tuberculous infection rather than rheumatoid nodule as in our case. We recommend the use of ultrasound to determine the nature of nodular swellings seen clinically in patients with arthropathy.
  6. Fulltext Understanding and preventing computer vision syndrome
    Loh KY, Reddy SC
    Malays Fam Physician, 2008;3(3):128-30.
    PMID: 25606136 MyJurnal
    The invention of computer and advancement in information technology has revolutionized and benefited the society but at the same time has caused symptoms related to its usage such as ocular sprain, irritation, redness, dryness, blurred vision and double vision. This cluster of symptoms is known as computer vision syndrome which is characterized by the visual symptoms which result from interaction with computer display or its environment. Three major mechanisms that lead to computer vision syndrome are extraocular mechanism, accommodative mechanism and ocular surface mechanism. The visual effects of the computer such as brightness, resolution, glare and quality all are known factors that contribute to computer vision syndrome. Prevention is the most important strategy in managing computer vision syndrome. Modification in the ergonomics of the working environment, patient education and proper eye care are crucial in managing computer vision syndrome.
  7. Fulltext Prevalence and risk factors for diabetic retinopathy--a study of 217 patients from University of Malaya Medical Centre
    Tajunisah I, Nabilah H, Reddy SC
    Med J Malaysia, 2006 Oct;61(4):451-6.
    PMID: 17243523
    Two hundred and seventeen diabetic patients attending the eye clinic were examined to determine the prevalence of retinal changes, and the association between diabetic retinopathy and risk factors. A detailed fundus examination was done, after dilating the pupils, using 90 D lens and slitlamp biomicroscope. Diabetic retinopathy was detected in 112 patients (51.6%). Background retinopathy was seen in 40 out of 217 (18.4%), pre-proliferative retinopathy in 11 (5.1%), proliferative retinopathy in 61 (28.1%) and maculopathy in 58 (26.7%) patients. Factors significantly associated with occurrence of retinopathy were duration of diabetes, presence of hypertension and presence of systemic complications (diabetic foot ulcer, lower limb amputation, nephropathy, and peripheral neuropathy).
    Study site: Eye clinic, University Malaya Medical Centre (UMMC), Kuala Lumpur, Malaysia
  8. Fulltext Dynamic traction and passive mobilization for the rehabilitation of zone II flexor tendon injuries: a modified regime
    Chai SC, Wong CW
    Med J Malaysia, 2005 Jul;60 Suppl C:59-65.
    PMID: 16381286
    This retrospective study aims to evaluate the effectiveness of the modified regime for rehabilitation of Zone II flexor tendon injuries in Sibu Hospital. From January to December 2003, 8 patients with 15 injured digits were treated by using the combined method of dynamic traction and passive mobilization. According to Strickland's criteria, 14 (93.3%) digits achieved good to excellent outcomes and only 1 (6.7%) was rated as poor. No occurrence of tendon rupture was noted. The overall grip strength of the injured hand was 50.1% of the uninjured hand at 3 months after the repair. Our results compare favorably with the other published studies. We believed that this modified regime is as effective as other established regimes and suitable to be adopted in our setting. Further study with larger sample group will be required to consolidate our findings.
  9. Ocular lesions in the inmates of leprosy rehabilitation centre
    Reddy SC, Raju BD
    Int J Biomed Sci, 2006 Sep;2(3):289-94.
    PMID: 23674993
    A detailed eye examination of 145 inmates of a leprosy rehabilitation centre was done to determine the prevalence of ocular involvement. Age, gender of patients, type and duration of leprosy, systemic disabilities were noted. The mean age of patients was 45.8 years (range 19-70 years); 72.4% were males; 55.2% were suffering from paucibacillary leprosy. The mean duration of leprosy was 18.2 years in multibacillary type and 13.1 years in paucibacillary type. Ocular lesions related to leprosy were seen in 85.5% of patients; more often in multibacillary leprosy (92.3%). Corneal changes (80.7%) were the most frequently observed lesions followed by eye lid lesions (48.2%). Potentially sight threatening lesions such as lagophthalmos (23.4%), cornealanaesthesia (43.4%), and iridocyclitis (8.9%) were seen in both types of leprosy. Nine out of 26 (34.6%) patients with history of erythema nodosum leprosum reaction showed eye changes related to this reaction. Blindness in one eye due to lesions related to leprosy was seen in 2.7% of eyes. Age related cataract was the most common cause of blindness in patients of leprosy. The prevalence of ocular lesions was found to be high in the inmates of leprosy rehabilitation centre, and they were seen more frequently in patients with longer duration of the disease. Potentially sight threatening lesions were more often associated with systemic disabilities in these patients.
  10. Fulltext Prevalence and causes of visual impairment and blindness in a rural population in Sepang district, Selangor
    Reddy SC, Rampal L, Nurulaini O
    Med J Malaysia, 2004 Jun;59(2):212-7.
    PMID: 15559172 MyJurnal
    A community based cross-sectional study was carried out to determine the prevalence and causes of visual impairment and blindness in residents aged forty years and above in kampung Jenderam Hilir of Sepang district, Selangor state. A total of 311 out of 341 (91.3%) respondents participated in this study. The prevalence of visual impairment and blindness observed was 18.9% and 2.9% respectively. The prevalence of visual impairment and blindness increased significantly with age. Amongst the 159 respondents who agreed for eye checkup, refractive errors (56%), cataract (20.1%), glaucoma (4.4%) and diabetic retinopathy (1.3%) were found to be causing visual impairment and blindness.
  11. Self-similar Gaussian processes for modeling anomalous diffusion
    Lim SC, Muniandy SV
    Phys Rev E Stat Nonlin Soft Matter Phys, 2002 Aug;66(2 Pt 1):021114.
    PMID: 12241157
    We study some Gaussian models for anomalous diffusion, which include the time-rescaled Brownian motion, two types of fractional Brownian motion, and models associated with fractional Brownian motion based on the generalized Langevin equation. Gaussian processes associated with these models satisfy the anomalous diffusion relation which requires the mean-square displacement to vary with t(alpha), 0
  12. Modeling of locally self-similar processes using multifractional Brownian motion of Riemann-Liouville type
    Muniandy SV, Lim SC
    Phys Rev E Stat Nonlin Soft Matter Phys, 2001 Apr;63(4 Pt 2):046104.
    PMID: 11308909
    Fractional Brownian motion (FBM) is widely used in the modeling of phenomena with power spectral density of power-law type. However, FBM has its limitation since it can only describe phenomena with monofractal structure or a uniform degree of irregularity characterized by the constant Holder exponent. For more realistic modeling, it is necessary to take into consideration the local variation of irregularity, with the Holder exponent allowed to vary with time (or space). One way to achieve such a generalization is to extend the standard FBM to multifractional Brownian motion (MBM) indexed by a Holder exponent that is a function of time. This paper proposes an alternative generalization to MBM based on the FBM defined by the Riemann-Liouville type of fractional integral. The local properties of the Riemann-Liouville MBM (RLMBM) are studied and they are found to be similar to that of the standard MBM. A numerical scheme to simulate the locally self-similar sample paths of the RLMBM for various types of time-varying Holder exponents is given. The local scaling exponents are estimated based on the local growth of the variance and the wavelet scalogram methods. Finally, an example of the possible applications of RLMBM in the modeling of multifractal time series is illustrated.
  13. Causes of childhood blindness in Malaysia: results from a national study of blind school students
    Reddy SC, Tan BC
    Int Ophthalmol, 2001;24(1):53-9.
    PMID: 11998890
    A national study was conducted in children attending six schools for the blind in Malaysia to identify the anatomical site and underlying causes of blindness (BL) and severe visual impairment (SVI), with a view to determine the potentially preventable and treatable causes so that appropriate control measures can be implemented in the future. The standardized clinical examination of eyes was performed and the findings were recorded on the WHO Prevention of Blindness Programme eye examination record form for children with blindness and low vision. A total of 358 children aged between 7 and 17 years were examined, of whom 332 (92.7%) were blind or severely visually impaired. The results relate to these 332 children. Lens was the major anatomical site (22.3%) of visual loss followed by retina (20.8%), whole globe (17.2%), cornea (15.1%), optic nerve (8.7%) and uvea (5.1%). Glaucoma was responsible for BL/SVI in 7.2% and others in 3.6% of cases. Hereditary diseases were responsible for visual loss in 29.5%, intrauterine factors in 4.5%, perinatal factors in 9% and childhood factors in 7.8% of cases. However, the aetiology was unknown in 49.1% of cases which included congenital anomalies of the globe. Childhood cataract and corneal scarring are major treatable causes of BL/SVI that can benefit from future intervention strategies. Perinatal screening for intrauterine factors and hereditary eye diseases, and appropriate interventional therapy will help in reducing the prevalence of childhood blindness.
  14. Tumours and tumour-like lesions of the eye: a clinicopathological study from Hospital University Sains Malaysia
    Reddy SC, Das PK
    Malays J Pathol, 1996 Dec;18(2):113-20.
    PMID: 10879232
    A total of 89 histopathologically proven ocular tumours and tumour-like lesions treated in Hospital University Sains Malaysia, Kubang Kerian, Kelantan over a period of nine years were reviewed for their age distribution, site of lesion and histological type. The tumours were observed in all age groups with a maximum prevalence in the first decade. Twenty lesions were malignant and 69 were benign. The eyelid was the most frequent location (51%), followed by the conjunctiva (32%). Retinoblastoma was the most common malignant tumour (10 cases) and dermoid cyst was the most common tumour-like lesion (16 cases).
  15. Effect of non-meat proteins, soy protein isolate and sodium caseinate, on the textural properties of chicken bologna
    Yusof SC, Babji AS
    Int J Food Sci Nutr, 1996 Jul;47(4):323-9.
    PMID: 8844254
    Nine formulations were processed into bologna with different ratios of soy protein isolate (SPI):sodium caseinate (SCA), i.e. 1:1, 1:2.5, 1:5, 5:1, 5:2.5, 5:5, 10:1, 10:2.5 and 10:5. The products were evaluated for yields, emulsion stability, physical measurements (shearforce-kgf and folding test) and taste panel evaluation. Formulations with 5:1 and 5:5 SPI:SCA had lower liquid loss resulting in higher yields while the others had poor emulsion stability and high liquid loss. Firmer texture was exhibited by formulations 1:1, 5:1 and 10:1 SPI:SCA but formulation with 1:1 SPI:SCA showed better gelation followed by 1:2.5, 1:5, 5:1, and 5:2.5. The other formulations had poor gelation and binding properties, especially formulation with 10:5 SPI:SCA. Sensory evaluation was carried out using 30 untrained panelists. Attributes evaluated were aroma, texture, chewiness, juiciness, saltiness, chicken taste and overall acceptance. Formulation with 5:1 SPI:SCA was more acceptable for texture, chicken taste and overall acceptance while formulation with 1:1 SPI:SCA was more acceptable for the chewiness, juiciness and saltiness attributes. There was no significant difference (P > 0.05) in aroma attribute, for all formulations.
  16. Epstein-Barr virus (EBV) in Malaysian upper-aerodigestive-tract lymphoma: incidence and sub-type
    Peh SC, Sandvej K, Pallesen G
    Int J Cancer, 1995 May 4;61(3):327-32.
    PMID: 7729943
    Epstein-Barr virus (EBV) type B, a less potent transformer of B lymphocytes than type A, has rarely been detected in EBV-associated neoplasms except in AIDS-related lymphomas, in which about 50% of the cases contained this sub-type. In this study we analyzed the association of EBV and the distribution of virus sub-types in Asian non-Hodgkin's lymphoma (NHL) of the upper aerodigestive tract. We studied archival material of 29 NHL cases from Malaysia. B- and T-cell associated antigens were demonstrated by immunohistochemistry, and EBV early RNA EBER-1 was demonstrated using the RNA in situ hybridization technique. EBV was detected in the majority of tumour cells in 11/13 T-NHL but in only 1/16 B-NHL. EBV was sub-typed by single-step polymerase chain reaction of the EBNA-2 gene. This was successful in 9/10 cases of EBER-1-positive tumours and all contained type-A virus only. Our results showed a preponderance of T-cell lymphoma of the upper aerodigestive tract in the ethnic Chinese group of Malaysian patients, and EBV was strongly associated with T-NHL but not with B-NHL. Our results suggest that type-A EBV is the prevalent sub-type in Asian NHL of the upper aerodigestive tract, similarly to findings in Asian nasopharyngeal carcinoma.
  17. The pattern of Ki-67 and bcl-2 expression in lymphoid malignancies
    Wang PL, Peh SC
    Malays J Pathol, 1997 Jun;19(1):59-64.
    PMID: 10879243
    The International Working Formulation divides non-Hodgkin's lymphoma (NHL) into three grades: low, intermediate and high. This grading system implies rate of tumour growth and hence prognosis. Ki-67 antigen is a proliferation-related nuclear antigen and bcl-2 oncogene product is known to inhibit apoptosis. This study aimed to determine the pattern of expression of Ki-67 antigen and bcl-2 oncoprotein in various grades of NHL. Paraffin-embedded tissues from 42 cases of NHL (7 low, 15 intermediate, 20 high grade) were retrieved from the files of the Department of Pathology, University of Malaya. Ki-67 antigen and bcl-2 oncoprotein were detected using immunohistochemistry. The percentage of positively stained neoplastic cells was determined by semi-quantitative estimation and given scores ranging from 0 to 6. Partition chi square test demonstrated the association of Ki-67 antigen expression and histological grade (p = 0.007). There was no significant difference in Ki-67 antigen expression between intermediate and high grade malignant lymphomas (p = 0.28), whereas significant difference was demonstrated between low and intermediate/high grade tumours (p = 0.003). Bcl-2 oncoprotein expression in the neoplastic cells varied widely within the three histological grades. Statistical analysis showed no association between the expression of bcl-2 oncoprotein and histological grade (p = 0.25). Ki-67 immunostaining is therefore a useful adjunct to histological grading of NHL.
  18. A prospective study of ocular manifestations in childhood acute leukaemia
    Reddy SC, Menon BS
    Acta Ophthalmol Scand, 1998 Dec;76(6):700-3.
    PMID: 9881556
    PURPOSE: To determine the prevalence of ocular manifestations in childhood acute leukaemia at the time of presentation.

    METHODS: Eighty-two children with acute leukaemia were examined for ocular lesions within two days of diagnosis before starting chemotherapy. The detailed ocular examination of both eyes was carried out by the ophthalmologist irrespective of the presence or absence of eye symptoms in all cases.

    RESULTS: Only 3 out of 82 children presented with eye symptoms (3.6%). However, ocular changes were found in 14 children (17%); ten with lymphoblastic and four with myeloid leukaemia. The ocular lesions observed were proptosis, intraretinal haemorrhages, white centered haemorrhages, cotton wool spots, macular haemorrhage, subhyaloid haemorrhage, vitreous haemorrhage, papilloedema, cortical blindness, sixth nerve palsy, and exudative retinal detachment with choroidal infiltration.

    CONCLUSION: In view of the high prevalence of asymptomatic ocular lesions in childhood acute leukaemia, routine ophthalmic examination should be included as a part of evaluation at the time of diagnosis.

  19. Fulltext Upper eyelid and eyebrow dimensions in Malays
    Dharap AS, Reddy SC
    Med J Malaysia, 1995 Dec;50(4):377-81.
    PMID: 8668060
    The upper eyelid crease height pretarsal skin and eyebrow height were studied in 305 Malay subjects (146 males and 159 females) varying in age from 2-80 years, who were randomly selected from the residents of Kota Bharu, Kelantan. In females, from the age of 11 years the mean pretarsal skin height increased progressively with age. In males, however, it decreased with age up to 60 years. In both sexes, subjects more than 60 years old showed highest values for pretarsal skin height. The mean eyelid crease height increased progressively with age from 11 years onwards in males but not in females. The mean eyebrow height increased with age in females but not in males. Eyebrow and eyelid measurements seem to show a definite racial variation. Besides establishing normal values for eyelid and eyebrow measurements in Malays, our findings indicate that age and sex should be taken into consideration to achieve satisfactory results in cosmetic eyelid surgery in Malays.
  20. Chronic pyelonephritis: the significance of renal renin and the vascular changes in the human kidney
    Peh SC, Lindop GB
    J Pathol, 1991 Apr;163(4):343-9.
    PMID: 2033493
    Hypertension complicates chronic pyelonephritis. Since arterial narrowing is common in the damaged kidney, activation of the renin-angiotensin system due to renal ischaemia has been suggested as a pathogenetic mechanism. We used an antiserum to human renin and an immunoperoxidase technique to study the anatomy of renin-containing cells (RCC) in 18 kidneys removed for pyeloneophritis. We independently assessed the degree of arterial narrowing and correlated these variables with the clinical findings. There was histological evidence of hyperplasia of RCC in 5 of the 6 hypertensive patients and in 7 of the 12 non-hypertensive cases. There was no difference in the apparent number or distribution of RCC between the hypertensive and the non-hypertensive cases. Also, the degree of arterial narrowing did not correlate with either the hyperplasia of RCC or the blood pressure of the patients. Our results do not support the hypothesis that narrowing of the intrarenal arteries is important in the pathogenesis of hypertension in pyelonephritis. In our cases, the renal veins were more severely damaged than the arteries and their lumina were often obliterated by organized thrombus. We suggest that such widespread obliteration of the renal venous tree could impair blood flow and contribute to the tissue damage in the pyelonephritic kidney.
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