Displaying publications 1 - 20 of 27 in total

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  1. Ibrahim AM, Kayat FB, Hussin ZE, Susanto D, Ariffulah M
    ScientificWorldJournal, 2014;2014:284342.
    PMID: 24757416 DOI: 10.1155/2014/284342
    Kenaf (Hibiscus cannabinus L.) is one of the important species of Hibiscus cultivated for fiber. Availability of homozygous parent lines is prerequisite to the use of the heterosis effect reproducible in hybrid breeding. The production of haploid plants by anther culture followed by chromosome doubling can be achieved in short period compared with inbred lines by conventional method that requires self pollination of parent material. In this research, the effects of the microspore developmental stage, time of flower collection, various pretreatments, different combinations of hormones, and culture condition on anther culture of KB6 variety of Kenaf were studied. Young flower buds with immature anthers at the appropriate stage of microspore development were sterilized and the anthers were carefully dissected from the flower buds and subjected to various pretreatments and different combinations of hormones like NAA, 2,4-D, Kinetin, BAP, and TDZ to induce callus. The best microspore development stage of the flower buds was about 6-8 mm long collected 1-2 weeks after flower initiation. At that stage, the microspores were at the uninucleate stage which was suitable for culture. The best callus induction frequency was 90% in the optimized semisolid MS medium fortified with 3.0 mg/L BAP + 3.0 mg/L NAA.
    Matched MeSH terms: Cell Division/physiology
  2. Phang MY, Ng MH, Tan KK, Aminuddin BS, Ruszymah BH, Fauziah O
    Med J Malaysia, 2004 May;59 Suppl B:198-9.
    PMID: 15468886
    Tricalcium phosphate/hydroxyapatite (TCP/HA), hydroxyapatite (HA), chitosan and calcium sulphate (CaSO4) were studied and evaluated for possible bone tissue engineered construct acting as good support for osteogenic cells to proliferate, differentiate, and eventually spread and integrate into the scaffold. Surface morphology visualized by SEM showed that scaffold materials with additional fibrin had more cell densities attached than those without, depicting that the presence of fibrin and collagen fibers were truly a favourite choice of cells to attach. In comparison of various biomaterials used incorporated with fibrin, TCP/HA had the most cluster of cells attached.
    Matched MeSH terms: Cell Division/physiology
  3. Jayaram G, Lamba S, Kakar A
    Malays J Pathol, 1993 Dec;15(2):131-6.
    PMID: 8065174
    Seventy-eight symptomatic females without palpable breast lumps were subjected to bilateral four quadrant fine needle aspiration cytology. Cytological evidence of an epithelial proliferative lesion was seen in 44 of these cases. Based on the cytological evidence of proliferation, the site for open biopsy was determined. Histopathological study of the breast biopsies in these patients showed proliferative disease without atypia (PDWA) in 40 cases, atypical ductal hyperplasia (ADH) in two, atypical lobular hyperplasia (ALH) in one and ADH with ALH in one case. Cytology was thus useful in establishing the presence of proliferative activity, commenting on the extent of proliferation, and thereby roughly mapping out the area of the breast most suitable for biopsy. On cytological grounds, it was not possible to distinguish the atypical hyperplastic lesions from the proliferative diseases without atypia.
    Matched MeSH terms: Cell Division/physiology
  4. Chong PP, Selvaratnam L, Abbas AA, Kamarul T
    J Orthop Res, 2012 Apr;30(4):634-42.
    PMID: 21922534 DOI: 10.1002/jor.21556
    The use of mesenchymal stem cells (MSCs) for cartilage repair has generated much interest owing to their multipotentiality. However, their significant presence in peripheral blood (PB) has been a matter of much debate. The objectives of this study are to isolate and characterize MSCs derived from PB and, compare their chondrogenic potential to MSC derived from bone marrow (BM). PB and BM derived MSCs from 20 patients were isolated and characterized. From 2 ml of PB and BM, 5.4 ± 0.6 million and 10.5 ± 0.8 million adherent cells, respectively, were obtained by cell cultures at passage 2. Both PB and BM derived MSCs were able to undergo tri-lineage differentiation and showed negative expression of CD34 and CD45, but positively expressed CD105, CD166, and CD29. Qualitative and quantitative examinations on the chondrogenic potential of PB and BM derived MSCs expressed similar cartilage specific gene (COMP) and proteoglycan levels, respectively. Furthermore, the s-GAG levels expressed by chondrogenic MSCs in cultures were similar to that of native chondrocytes. In conclusion, this study demonstrates that MSCs from PB maintain similar characteristics and have similar chondrogenic differentiation potential to those derived from BM, while producing comparable s-GAG expressions to chondrocytes.
    Matched MeSH terms: Cell Division/physiology
  5. Elsadig RE, Reimann K, Yip CH, Lai LC
    Anticancer Res, 2001 Jul-Aug;21(4A):2693-6.
    PMID: 11724341
    Oestrone sulphate is a major source of active oestrogens in the breast. It is converted to oestrone by oestrone sulphatase. Breast cyst fluid (BCF) is a rich source of sex hormones and growth factors. BCF obtained from British women has been shown to inhibit oestrone sulphatase activity in the MCF-7 oestrogen-receptor-positive breast cancer cell line. The aim of the present study was to assess whether BCF obtained from Malaysian women inhibited oestrone sulphatase activity in the MCF-7 and MDA-MB-231 breast cancer cell lines. The cell lines were grown in supplemented Dulbecco's Modified Eagle Medium for 3 days, following which a 3-day incubation with sterilised BCF was carried out. At the end of the treatment period the cell monolayers were assayed for oestrone sulphatase activity and the number of cell nuclei counted on a Coulter Counter. BCF was also fractionated on a Bio-Sil SEC 125-5 column by HPLC and the effects of the fractions collected on oestrone sulphatase activity in the MDA-MB-231 cell line were assessed. All 18 samples of BCF tested inhibited cell growth in the MDA-MB-231 cell line while 8 out of 10 samples inhibited MCF-7 cell growth; 15 out of 18 BCF samples inhibited oestrone sulphatase activity in the MDA-MB-231 cell line whereas 5 out of 10 samples stimulated oestrone sulphatase activity in the MCF-7 cell line. HPLC fractions corresponding to molecular weights of > 158 kDa and 28 kDa were found to inhibit oestrone sulphatase activity in the MDA-MB-231 cell line. Further work is required to fully characterise these substances as they may have roles to play in the prevention of breast cancer.
    Matched MeSH terms: Cell Division/physiology
  6. Jayaram G, Gupta M, Lamba S
    Malays J Pathol, 1993 Dec;15(2):137-42.
    PMID: 8065175
    Forty-eight patients with breast carcinoma were subjected to four quadrant fine needle aspiration (FNA) cytology examination of the ipsilateral and contralateral breast in an attempt to detect any accompanying benign proliferative lesion. Mastectomy of ipsilateral and open biopsy of contralateral breast provided material for histopathological study. Cytological evidence of epithelial proliferation was found in 8 (16.6%) cases which included atypical lobular hyperplasia (ALH), lobular neoplasia in-situ (LNIS), atypical ductal hyperplasia (ADH), and proliferative disease without atypia (PDWA). In lobular proliferative lesions, cytological smears showed configurations of cells that resembled filled up or expanded lobular units. The cytology was not distinctive enough to distinguish the sub-types of lobular proliferations. Likewise, the presence of ductal alterations could be suggested by cytological study but the distinction of proliferative disease without atypia (PDWA) from atypical ductal hyperplasia (ADH) was not possible on a cytological basis.
    Matched MeSH terms: Cell Division/physiology
  7. Goh JC, Ouyang HW, Toh SL, Lee EH
    Med J Malaysia, 2004 May;59 Suppl B:47-8.
    PMID: 15468812
    Matched MeSH terms: Cell Division/physiology
  8. Goh JC, Shao XX, Hutmacher D, Lee EH
    Med J Malaysia, 2004 May;59 Suppl B:17-8.
    PMID: 15468797
    Matched MeSH terms: Cell Division/physiology
  9. Santin M, Morris C, Harrison M, Mikhalovska L, Lloyd AW, Mikhalovsky S
    Med J Malaysia, 2004 May;59 Suppl B:93-4.
    PMID: 15468834
    In-stent restenosis is caused by the proliferation of the smooth muscle cells (SMCs) following a host response towards the implanted device. However, the precise biochemical and cellular mechanisms are still not completely understood. In this paper, the behaviour of SMCs has been investigated by an in vitro model where the cells were stimulated by platelet derived growth factor (PDGF) on tissue-like substrates as well as on biomaterials such as stainless steel (St) and diamond-like carbon (DLC)-coated St. The results demonstrated that SMCs have a completely different adhesion mode on St and become particularly prone to proliferation and pro-inflammatory cytokine secretion under PDGF stimulus. This would suggest that restenosis may caused by the accidental contact of the SMC with the St substrate under an inflammatory insult.
    Matched MeSH terms: Cell Division/physiology*
  10. Gandhi S, Nor Rashid N, Mohamad Razif MF, Othman S
    Mol Biol Rep, 2021 Jun;48(6):5121-5133.
    PMID: 34169395 DOI: 10.1007/s11033-021-06509-4
    The High-Risk Human Papillomaviruses (HR-HPVs) 16 and 18 are known to cause cervical cancer, which is primarily attributed to E6 and E7 oncoproteins. In addition, recent studies have focused on the vital role of the p130 pocket protein as an oncosuppressor to limit the expression of E2F transcription factors required for cell cycle progression. In view of this, the current study was conducted to investigate the mechanism by which transfection with HPV16/18 E7 leads to the deregulation of the host cell cycle, altering the localisation of p130, and expression of differentiation genes in Human Keratinocytes (HaCaT) cells. Co-immunoprecipitation, Western blot analysis, immunofluorescence microscopy, flow cytometry, quantitative-Polymerase Chain Reaction (qPCR), and the inhibition of p130 by MG132 inhibitor were employed to investigate the loss of p130 and its disruption in HPV 16/18 E7-transfected HaCaT cells. The HPV16- and HPV18-transformed cells, known as CaSki and HeLa, respectively, were also used to complement the ectopic expressions of E7 in HaCaT cells. Normal keratinocytes displayed higher level of p130 expression than HPV-transformed cells. In addition, the immunofluorescence analysis revealed that both HPV 16/18 E7-transfected HaCaT and HPV-transformed cells exhibited higher level of cytoplasmic p130 compared to nuclear p130. A significant increase in the number of S/G2 phase cells in HPV-transformed cells was also recorded since E7 has been shown to stimulate proliferation through the deactivation of Retinoblastoma Protein (pRB)-dependent G1/S checkpoint. Furthermore, the findings recorded the down-regulation of keratinocyte differentiation markers, namely p130, keratin10, and involucrin. The proteasomal degradation of the exported p130 confirmed the cellular localisation pattern of p130, which was commonly observed in cancerous cells. The findings provide strong evidence that the localisation of nuclear p130 nuclear was disrupted by HPV16/18 E7 led to the deregulation of the cell cycle and the impairment of cellular differentiation ultimately lead to cellular transformation.
    Matched MeSH terms: Cell Division/physiology
  11. Kim LH, Eow GI, Peh SC, Poppema S
    Pathology, 2003 Oct;35(5):428-35.
    PMID: 14555388
    AIMS: CD30, CD40 and CD95 are members of the tumour necrosis factor receptor superfamily. Ligation to their respective ligands (CD30L, CD40L, CD95L) will generate a diverse set of signalling cascades. We aim to study the expression pattern of CD30, CD40 and CD95 in classical Hodgkin's lymphoma (cHL) and to correlate the expressions with proliferation and apoptosis in the Hodgkin/Reed-Sternberg (H/RS) cells of cHL with or without associated Epstein-Barr virus (EBV) infection.

    METHODS: A total of 66 cHL cases were retrieved from the archives. Expressions of CD30, CD40, CD95 and proliferation by Ki-67 expression were detected with an immunohistochemical staining method. Apoptosis index was assessed by in situ TUNEL staining technique on 30 randomly selected cases and the presence of EBV was determined by EBER in situ hybridisation.

    RESULTS: Expression of CD30, CD40 and CD95 in the H/RS cells was observed in a high proportion of the cases (100, 93.9, 90.5%, respectively). There was no significant association or correlation of the expression of these molecules with the presence of EBV. Expression of CD40 was associated with expression of the proliferation marker Ki-67 (P=0.044), whereas strong (intermediate and high) expression of CD30 showed a significant correlation with proliferation in the EBV-negative cases only (P=0.025). No correlation was observed for the expression of CD30 and CD40 with apoptosis of the H/RS cells. The childhood cases showed weaker CD95 expression in the H/RS cells than the adult cases, and the expression of CD95 was weaker than that of CD40 in the childhood group.

    CONCLUSIONS: Our results showed that CD30, CD40 and CD95 are highly expressed in the H/RS cells of the majority of cases of cHL. The expression patterns seem to be independent of EBV and do not correlate with apoptosis of the H/RS cells.

    Matched MeSH terms: Cell Division/physiology
  12. Shamsul BS, Aminuddin BS, Ng MH, Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:196-7.
    PMID: 15468885
    Bone marrow harvested by aspiration contains connective tissue progenitor cells which can be selectively isolated and induced to express bone phenotype in vitro. The osteoblastic progenitor can be estimated by counting the number of cells attach using the haemacytometer. This study was undertaken to test the hypothesis that human aging is associated with a significant change on the number of osteoblastic progenitors in the bone marrow. Bone marrow aspirates were harvested from 38 patients, 14 men (age 11-70) and 24 women (age 10-70) and cultured in F12: DMEM (1:1). In total 15 bone marrow samples have been isolated from patients above 40 years old (men/women) of age. Fourteen (93.3%) of this samples failed to proliferate. Only one (6.7%) bone marrow sample from a male patient, aged 59 years old was successfully cultured. Seventy percent (16/23) of the samples from patient below than 40 years old were successfully cultured. However, our observation on the survival rate for cells of different gender from patient below 40 years old does not indicate any significant difference. From this study, we conclude that the growth of bone marrow stromal cells possibly for bone engineering is better from bone marrow aspirates of younger patient.
    Matched MeSH terms: Cell Division/physiology*
  13. Muhd Fakhruddin BH, Aminuddin BS, Mazlyzam AL, Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:182-3.
    PMID: 15468878
    Skin is the largest organ in human system and plays a vital role as a barrier against environment and pathogens. Skin regeneration is important in tissue engineering especially in cases of chronic wounds. With the tissue engineering technology, these skins equivalent have been use clinically to repair burns and wounds. Consented redundant skin samples were obtained from patients aged 9 to 65 years old. Skin samples were digested with dispase, thus separating the epidermis and the dermis layer. The epidermis layer was trypsinized and cultured in DKSFM in 6-well plate at 37 degrees C and 5% CO2. Once confluent, the culture were trypsinized and the cells were pooled. Cells were counted using haemacytometer. Doubling time and viability were calculated and analysed. From the result, we conclude that doubling time and viability of in vitro keratinocytes cultured in DKSFM media is not age dependant.
    Matched MeSH terms: Cell Division/physiology
  14. Chua KH, Aminuddin BS, Fuzina NH, Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:194-5.
    PMID: 15468884
    We have previously formulated an optimized human chondrocytes growth medium based on 2% fetal bovine serum supplementation. For clinical usage, the animal serum must be replaced by patient own serum. We investigated the effects of human serum concentration for human nasal septum chondrocytes monolayer culture and cartilage reconstruction. Human serum demonstrated a dose dependent manner in promoting chondrocytes growth and cartilage engineering.
    Matched MeSH terms: Cell Division/physiology
  15. Saim L, Aminuddin BS, Munirah S, Chua KH, Izuddin Fahmy A, Fuzina NH, et al.
    Med J Malaysia, 2004 May;59 Suppl B:192-3.
    PMID: 15468883
    To date there is no optimal approach to reconstruct an external ear. However, advances in tissue engineering technologies have indicated that in vitro autologous elastic cartilage might be of great importance in the future treatment of these patients. The aim of this study was to observe monolayer expansion of auricular cartilage and to evaluate engineered cartilage using standard histochemical study.
    Matched MeSH terms: Cell Division/physiology
  16. Tan KK, Aminuddin BS, Tan GH, Sabarul Afian M, Ng MH, Fauziah O, et al.
    Med J Malaysia, 2004 May;59 Suppl B:43-4.
    PMID: 15468810
    The strategy used to generate tissue-engineered bone construct, in view of future clinical application is presented here. Osteoprogenitor cells from periosteum of consenting scoliosis patients were isolated. Growth factors viz TGF-B2, bFGF and IGF-1 were used in concert to increase cell proliferation during in vitro cell expansion. Porous tricalcium phosphate (TCP)-hydroxyapatite (HA) scaffold was used as the scaffold to form 3D bone construct. We found that the addition of growth factors, greatly increased cell growth by 2 to 7 fold. TCP/HA proved to be the ideal scaffold for cell attachment and proliferation. Hence, this model will be further carried out on animal trial.
    Matched MeSH terms: Cell Division/physiology
  17. Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:30-1.
    PMID: 15468804
    Patient own fibrin may act as the safest, cheapest and immediate available biodegradable scaffold material in clinical 1 tissue engineering. This study investigated the feasibility of using patient own fibrin isolated from whole blood to construct a new human cartilage, skin and bone. Constructed in vitro tissues were implanted on the dorsal part of the nude mice for in vivo maturation. After 8 weeks of implantation, the engineered tissues were removed for histological analysis. Our results demonstrated autologous fibrin has great potential as clinical scaffold material to construct various human tissues.
    Matched MeSH terms: Cell Division/physiology
  18. Azmi B, Aminuddin BS, Sharaf I, Samsudin OC, Munirah S, Chua KH, et al.
    Med J Malaysia, 2004 May;59 Suppl B:13-4.
    PMID: 15468795
    Animal serum is commonly used in chondrocytes culture expansion to promote cell proliferation and shorten the time lag before new tissue reconstruction is possible. However, animal serum is not suitable for regeneration of clinical tissue because it has potential risk of viral and prion related disease transmission particularly mad cow disease and foreign protein contamination that can stimulate immune reaction leading to graft rejection. In this context, human serum as homologous supplement has a greater potential as growth promoting agents for human chondrocytes culture.
    Matched MeSH terms: Cell Division/physiology
  19. Munirah S, Aminuddin BS, Chua KH, Fuzina NH, Isa MR, Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:9-10.
    PMID: 15468793
    Autologous cells are usually preferred in treating damaged tissue to avoid risks of immunological rejection and transmitting infectious diseases. Since only limited amount of tissue can be obtained without causing morbidity at the donor site, in vitro expansion of isolated cell is essential in order to acquire sufficient number of cells to reconstruct neocartilage. The aim of this study was to examine whether serial expanded chondrocytes can be use to generate neocartilage in vivo.
    Matched MeSH terms: Cell Division/physiology
  20. Chua KH, Aminuddin BS, Fuzina NH, Ruszymah BH
    Med J Malaysia, 2004 May;59 Suppl B:7-8.
    PMID: 15468792
    The regulation roles of insulin-like growth factor-1 (IGF-1) with basic fibroblast growth factor (bFGF) and transforming growth factor beta 2 (TGFbeta2) in human nasal septum chondrocytes monolayer culture and cartilage engineering was investigated in this study. The role of IGF-1 with bFGF and TGFbeta2 was investigated by measuring chondrocyte growth kinetic and collagen genes expression. IGF-1 together with bFGF and TGFbeta2 promote cartilage tissue engineering, increase type II collagen expression and enhance the histological features of engineered cartilage.
    Matched MeSH terms: Cell Division/physiology
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