Ahmed Aljazzar - Academia.edu (original) (raw)

Papers by Ahmed Aljazzar

Frontiers in Pharmacology

Lead toxicity is a common occupational and environmental health hazard that exerts many toxic eff... more Lead toxicity is a common occupational and environmental health hazard that exerts many toxic effects on animals and humans, including immunotoxicity. Curcumin (CUR) and cinnamon (CIN) are common medicinal herbs with immunostimulatory and antioxidant properties. Therefore, this study investigated the protective effect of curcumin and cinnamon against lead acetate (LA)-induced splenotoxicity in rats via hemato-biochemical, immunological, oxidative stress marker, CYP-2E1 expression, histological, and immunohistological evaluations. Four groups of seven rats each were used: the control group received corn oil as a vehicle; the lead acetate group received (100 mg/kg), the CUR + LA group received curcumin (400 mg/kg) plus lead acetate, and the CIN + LA group received cinnamon (200 mg/kg) plus lead acetate orally for 1 month. LA exposure induced macrocytic hypochromic anemia, leukocytosis, neutrophilia, monocytosis, and lymphopenia. Additionally, significant elevations in serum iron, ferr...

Bone and Tooth Society, was founded in 1950. The BRS is one of the largest national scientific so... more Bone and Tooth Society, was founded in 1950. The BRS is one of the largest national scientific societies in Europe dedicated to clinical and basic research into mineralized tissues and is the oldest such society in the world. Meetings are held annually, attracting a wide audience from throughout the UK and beyond. The presentations are traditionally balanced between clinical and laboratory studies. The participation of young scientists and clinicians is actively encouraged. The Annual Meeting this year was organized by a team from The University of Southampton, co-chaired by Dr Kate Ward and Professor Nicholas Harvey, and also including Dr Claire Clarkin, Professor Richard Oreffo, and Professor Cyrus Cooper. The program brought together world leaders in musculoskeletal clinical and basic science. A multidisciplinary faculty provided a breadth of education and research from the Developmental Origins of disease through tissue regeneration and biomechanical engineering. The sessions this year were: Rare bone diseases Muscle bone interactions Tissue engineering and regenerative medicine Cellular senescence Imaging: from mice to men Osteocytes Prevention of osteoporotic fracture through the lifecourse (Dent Award-Cyrus Cooper) Early-life origins of disease Ageing Osteo-angiogenic coupling

Environmental Science and Pollution Research

Journal of Veterinary Diagnostic Investigation

Hepatic lobe torsion is a rare condition in domestic animals. Clinical signs are variable, with s... more Hepatic lobe torsion is a rare condition in domestic animals. Clinical signs are variable, with some cases remaining subclinical and others resulting in death. Most cases are diagnosed either by laparotomy or during postmortem examination. During postmortem inspection of 670 slaughtered dromedary camels, hepatic lobe torsion of the quadrate lobe was detected in 3 adult female camels. Clinical signs had not been noted on antemortem veterinary inspection, and hepatic lobe torsion was likely an incidental finding. Histologically, the affected liver lobe exhibited severe hepatocellular loss with replacement by fibrous connective tissue. When investigating abdominal pain in camels, veterinarians should include hepatic lobe torsion in the list of differential diagnoses.

Buffalo Bulletin, Nov 12, 2021

Environmental Science and Pollution Research, 2021

The objectives of the present study were first to determine the residual contents of total aflato... more The objectives of the present study were first to determine the residual contents of total aflatoxins (AFTs), lead (Pb), and cadmium (Cd) in the edible tissues of the cattle reared in Al-Ahsa, Saudi Arabia. Al-Ahsa is the largest governorate in the Eastern Province of Saudi Arabia. The two main economic activities of Al-Ahsa are oil production (industrial) and agriculture. Besides, dietary intake and possible health risks for Saudi population were further calculated. In order to establish potential molecular biomarkers for xenobiotic exposure in cattle, the mRNA expression of xenobiotic-metabolizing enzymes (XMEs) including cytochrome P450 (CYP) 1A1, NAD(P)H dehydrogenase [quinone] 1 (NQO1), metallothionein (MT) 1A, and heat shock protein (HSP) 70 was investigated in the different tissues of the cattle. The tested XMEs were selected because of their specific roles in the metabolism and detoxification of AFTs, Pb, and Cd. The obtained results revealed that the liver had significantly the highest AFT content, while all examined muscle samples had no AFT residues. Consumption of the bovine liver and kidneys represents the highest source for the dietary exposure to total AFTs (0.05–0.98 μg/kg/day), Pb (0.06–0.19 mg/kg/day), and Cd (0.08–0.19 mg/kg/day) among the examined tissues. Therefore, excessive intake of such organs might pose a public health concern, particularly among children. Significant upregulation of mRNA expressions of CYP1A1, NQO1, MT1A, and HSP70 was observed in the different tissues of the cattle in comparison with the muscle. This upregulation had significant positive correlation with the accumulated AFTs, Pb, and Cd. This indicates the possible use of CYP1A1, NQO1, MT1A, and HSP70 as potential biomarkers for the exposure of the cattle to AFTs, Pb, and Cd.

Basic and Applied Sciences - Scientific Journal of King Faisal University, 2021

One of the widely used insecticides in agriculture and urban pest control is oxydemeton-methyl, w... more One of the widely used insecticides in agriculture and urban pest control is oxydemeton-methyl, which is an organothiophosphate compound. It has a high bioaccumulation effect due to its increased solubility and mobility. This study was carried out to investigate the effect of oxydemeton-methyl toxicity on the environment, and female New Zealand rabbits were used as a model. The rabbits were given oxydemeton-methyl orally in drinking water at a concentration of 34 ppm for six weeks. The clinical signs were diarrhoea, emesis, salivation, lacrimation, fasciculation, muscle tremors and weakness. The haematological parameters, such as the RBCs count, the Hb concentration and the PCV % were significantly decreased. On the contrary, the WBCs count were significantly increased. In addition, an acetylcholinesterase enzyme was inhibited, and a histopathological examination on the liver showed small areas of oval and bridge necrosis infiltrated with mononuclear cells. In the kidneys, there was...

The American Journal of Pathology, 2019

Glucocorticoid-induced secondary osteoporosis is the most predictable side effect of this antiinf... more Glucocorticoid-induced secondary osteoporosis is the most predictable side effect of this antiinflammatory. One of the main mechanisms by which glucocorticoids achieve such deleterious outcome in bone is by antagonizing Wnt/b-catenin signaling. Sclerostin, encoded by Sost gene, is the main negative regulator of the proformative and antiresorptive role of the Wnt signaling pathway in the skeleton. It was hypothesized that the partial inactivation of sclerostin function by genetic manipulation will rescue the osteopenia induced by high endogenous glucocorticoid levels. Sost-deficient mice were crossed with an established mouse model of excess glucocorticoids, and the effects on bone mass and structure were evaluated. Sost haploinsufficiency did not rescue the low bone mass induced by high glucocorticoids. Intriguingly, the critical manifestation of Sost deficiency combined with glucocorticoid excess was sporadic, sudden, unprovoked, and nonconvulsive death. Detailed histopathologic analysis in a wide range of tissues identified peracute hemopericardium and cardiac tamponade to be the cause. These preclinical studies reveal outcomes with direct relevance to ongoing clinical trials that explore the use of antisclerostin antibodies as a treatment for osteoporosis. They particularly highlight a potential for increased cardiovascular risk and may inform improved stratification of patients who might otherwise benefit from antisclerostin antibody treatment.

Bone, 2017

Osteoarthritis (OA), affecting joints and bone, causes physical gait disability with huge socio-e... more Osteoarthritis (OA), affecting joints and bone, causes physical gait disability with huge socio-economic burden; treatment remains palliative. Roles for antioxidants in protecting against such chronic disorders have been examined previously. Sulforaphane is a naturally occurring antioxidant. Herein, we explore whether SFX-01®, a stable synthetic form of sulforaphane, modifies gait, bone architecture and slows/reverses articular cartilage destruction in a spontaneous OA model in STR/Ort mice. Sixteen mice (n=8/group) were orally treated for 3months with either 100mg/kg SFX-01® or vehicle. Gait was recorded, tibiae were microCT scanned and analysed. OA lesion severity was graded histologically. The effect of SFX-01® on bone turnover markers in vivo was complemented by in vitro bone formation and resorption assays. Analysis revealed development of OA-related gait asymmetry in vehicle-treated STR/Ort mice, which did not emerge in SFX-01®-treated mice. We found significant improvements i...

Bone Abstracts, 2016

Objectives: Osteocytes are key players in regulating bone mass maintenance and thus constitute a ... more Objectives: Osteocytes are key players in regulating bone mass maintenance and thus constitute a major research focus in the field of bone biology. Since analysis of osteocyte function often requires in vivo investigations, promoter elements of osteocyte-specific genes i.e. SOST or Dentin-matrix-protein[for full text, please go to the a.m. URL]

International journal of molecular sciences, Jan 26, 2016

Mice harbouring a dentin matrix protein 1 (Dmp1) promoter-driven human diphtheria toxin (DT) rece... more Mice harbouring a dentin matrix protein 1 (Dmp1) promoter-driven human diphtheria toxin (DT) receptor (HDTR) transgene (Tg) have recently been used to attain targeted ablation of osteocytes by diphtheria toxin (DT) treatment in order to define osteocyte function. Use of these Tg mice has asserted mechano- and novel paracrine regulatory osteocyte functions. To explore osteocyte roles fully, we sought to confirm the selectivity of DT effects in these transgenic mice. However, our findings revealed incomplete DT-induced osteocyte ablation, prevalent HDTR misexpression, as well as more prominent histopathological DT-induced changes in multiple organs in Tg than in wild-type (WT) littermate mice. Mechanistic evidence for DT action, via prominent regulation of phosphorylation status of elongation factor-2 (EF-2), was also found in many non-skeletal tissues in Tg mice; indicative of direct "off-target" DT action. Finally, very rapid deterioration in health and welfare status in r...