Impact of Bariatric and Metabolic Surgery on the Reduction of Premature Aging.

We would like to invite the participants to take part in a research study carried out at the 2nd Department of General Surgery of the Jagiellonian University CM.

Participation in the study is offered to patients who have qualified for surgical treatment of morbid obesity and have been accepted for laparoscopic sleeve gastrectomy (LSG) or laparoscopic Roux-en-Y gastric bypass (LRYGB) in the Department of Endoscopic, Metabolic and Soft Tissue Surgery. It is well known that morbid obesity contributes to premature aging. One of the topics addressed in recent scientific research is the mechanism of reversal of the aging process in patients undergoing LSG or LRYGB surgery. Assessments of the progression of aging can be carried out by evaluating the age of the body in different contexts. For this purpose, metabolic age - indicating the level of basal metabolism, psychological age - the ability to cognitively function, focus attention, remember, biochemical age - the level of oxidative stress on cells - are determined. A much better parameter for assessing organismal age is telomere length (TL) - molecular age. Telomeres are specialised structures located at the ends of chromosomes - the intracellular structures that carry genetic information. Telomere shortening with age is part of the normal aging process. It has been shown that patients suffering from morbid obesity have shorter telomere lengths compared to people of the same age who have never suffered from obesity, and that telomeres might lengthen after bariatric surgery. However, it is unclear what is responsible for the effect of telomere lengthening, thereby reversing the aging process. The proposed study aims to assess the effect of metabolic surgery on telomere length change and other markers of aging (metabolic age, psychological age, biochemical age, molecular age). The secondary objectives of the study will be to understand the mechanisms responsible for reversing the aging process in bariatric and metabolic surgery patients.

An observational study consisting of two phases was planned. In the first stage, baseline anthropometric and clinical data will be collected on the day of admission to the surgical ward, including the following parameters: age, sex, body weight, height, BMI, duration of obesity, family history of obesity, preoperative weight loss, information on concomitant diseases and medications taken. For the assessment of biochemical and molecular aging, the participants will be asked to consent to the collection of three tubes of peripheral blood.

One blood sample will be preserved in serum tubes for the analysis of inflammatory parameters such as Interleukin-6 (IL-6), C-reactive protein (CRP), Tumor necrosis factor alpha (TNFalpha) and for the determination of the blood antioxidant capacity - total oxidative status (TOS). A second blood sample will be collected into tubes containing an anticoagulant in the form of EDTA for the isolation of DNA for the assessment of DNA damage marker and telomere length. A third blood sample will be preserved in special RNA Pax tubes for testing of expression of genes related to telomere lenghtening. The other markers of aging will include: metabolic age (assessed by bioimpedance scanning, TANITA) and the psychological age determined by using special psychological tests (CTT Colour Connectivity Test and Winscosin Card Sorting Test) for the assessment of cognitive function. Ale the tests will take approximately 30 minutes to be completed.

The second stage of the study will take place 24 months after the operation at the follow-up visit, when all the steps described above will be performed again.